JP6325391B2 - Adjusting system for throwing water level meter, adjusting method thereof, adjusting program thereof, and throwing water level meter with adjusting function - Google Patents

Description

  The present embodiment relates to a technique for adjusting the indicated value of a throw-in type water level gauge.

  In facilities that have become difficult to enter, such as nuclear power plants damaged by tsunamis and earthquakes, it is sometimes required to measure the water level of the liquid inside. As a conventionally known water level meter, there is a bubble type water level meter that calculates a water level by measuring a pressure required to send bubbles to the bottom of the water with a bubbler tube having an open end arranged at the bottom of the water.

  The bubble type water level meter is a water level meter that slowly blows out bubbles from a tube opened to a liquid and measures the pressure in the tube at that time by a sensor. Since the pressure in the pipe is equal to the sum of the atmospheric pressure and the water pressure applied to the open end of the pipe, the water level can be obtained by subtracting the atmospheric pressure from the pressure at the open end.

The bubble-type water level meter requires an air supply source for sending bubbles to the bottom of the water, and the apparatus becomes large. In addition, installation work for fixing the device in the vicinity of the liquid is required.
One type of water level gauge that does not require such installation work is the throw-in type water level gauge. The throw-in type water level gauge is smaller and easier to operate than the bubble type water level gauge. This throwing water level gauge is widely used in general industries to measure water levels in river monitoring programs and water and sewage systems.
In addition, a throw-in water level meter that is easier to set up and maintain and that can measure a stable water level has been proposed.

By the way, the water level indicated by the throwing water level gauge may deviate from the true water level due to several factors.
For example, in a water level meter that derives a water level based on water pressure, if the density of the liquid is higher than a specific gravity 1 depending on the type of liquid stored, the water level is displayed as deeper than the actual level.
Further, there may be a difference between the electrical signal relating to the water level sent to the display unit and the indicated value of the water level due to the mechanical shift of the meter built in the display unit.
Therefore, in order to improve the accuracy of the indicated value of the water level calculated by the throw-in type water level gauge, it is necessary to calibrate or correct each factor of deviation.

Japanese Patent Application Laid-Open No. 07-054394 JP 2000-337945 A Japanese Utility Model Publication No. 3-2821

However, if the stored liquid contains a radionuclide, and a member of the water level indicating value correction means or calibration means (a submerged member) is thrown into the liquid together with the detector of the water level gauge, the submerged member is It cannot be easily lifted onto the water.
Therefore, when the stored liquid contains a radionuclide, the submerged member cannot be easily replaced or repaired.

  The embodiment of the present invention has been made in consideration of such circumstances, and even when a malfunction occurs in a part of the submerged member of the correction unit or the calibration unit, the measurement is continued without lifting the detector onto the water. It is an object of the present invention to provide an adjustment system for an input water level gauge, an adjustment method thereof, an adjustment program thereof, and an input water level gauge with an adjustment function.

  The adjustment system of the throw-in type water level meter according to the present embodiment includes three or more water pressure measuring devices fixed at different water depths to the outer surface of the detector thrown into the stored liquid, and three or more water pressure measuring devices. Assigns the main measuring device that measures the main measuring water pressure and the sub-measurement device that measures the sub measuring water pressure, the difference between the main measuring water pressure and the sub measuring water pressure, and the difference in water depth between the main measuring device and the sub measuring device. A derivation unit that derives the density of the liquid based on the first and a first correction unit that corrects the indicated value of the water level based on the density derived by the derivation unit.

  The adjustment system of the throw-in type water level meter according to the present embodiment seals the end of the housing partly opened to the liquid with a pressure sensor, and the pressure sensor is connected to the water pressure received from the liquid and the housing. A water level meter having a detector for detecting a differential pressure from the atmospheric pressure received from the inside of the housing by a hollow cable, and a display unit for displaying the water level of the liquid based on the differential pressure between the water pressure and the atmospheric pressure On the other hand, in the adjustment system for calibrating the indicated value of the water level displayed on the display unit, from among three or more water pressure measuring devices and three or more water pressure measuring devices fixed at different water depths on the outer surface of the detector Based on the allocation unit that assigns the main measuring device that measures the main measuring water pressure and the sub measuring device that measures the sub measuring water pressure, the difference between the main measuring water pressure and the sub measuring water pressure, and the difference in water depth between the main measuring water pressure meter and the sub measuring device And a derivation unit for deriving the density of the liquid A first correction unit that corrects the main measurement water pressure measured by the main measuring device based on the derived density, a pressurization unit that pressurizes the corrected main measurement water pressure from the hollow cable, and the main measurement water pressure is increased. And a calibration unit that calibrates the indicated value so that the indicated value indicates a zero point.

  Moreover, the throw-in type water level meter with an adjustment function according to the present embodiment seals the end of the casing, which is partially opened to the liquid, with the pressure sensor, and the water pressure received from the liquid by the pressure sensor and the casing A detector that detects the differential pressure with respect to the atmospheric pressure received from the inside of the housing by the connected hollow cable, a display that displays the water level of the liquid based on the differential pressure, and fixed at different water depths on the outer surface of the detector Three or more water pressure measuring devices, an assigning unit for assigning a main measuring device for measuring the main measuring water pressure and a sub measuring device for measuring the sub measuring water pressure among the three or more water pressure measuring devices, and the main measuring water pressure and the sub measuring. A deriving unit for deriving the density of the liquid based on the difference between the water pressure and the difference in water depth between the main measuring device and the sub-measuring device, and a first for correcting the indicated value of the water level based on the density derived by the deriving unit The main measuring water pressure is hollow with the correction unit and the corrected main measuring instrument. And pressurizing pressurizing the instruction value is what and a calibration unit for calibrating an indication to indicate zero when the main measurement pressure is pressurized.

  In addition, the adjustment method of the throw-in type water level meter according to the present embodiment seals the end of the casing, which is partially opened to the liquid, with the pressure sensor, and the pressure sensor receives the water pressure received from the liquid and the casing. For the detector that detects the differential pressure with the atmospheric pressure received from the inside of the housing by the connected hollow cable, and the throwing water level meter that calculates the water level of the liquid based on the differential pressure between the water pressure and the atmospheric pressure, In the adjustment method for calibrating the indicated value of the water level displayed on the display unit, a step of selecting two water depths at which the water pressure is measured as the main measurement water pressure and the sub measurement water pressure among three or more different water depths, and the main measurement water pressure is added. Correcting the indicated value so that the indicated value indicates a zero point when pressed, deriving the density of the liquid based on the difference between the main measured water pressure and the sub-measured water pressure and the difference between the two water depths; Measured based on derived density Correcting the corrected main measured water pressure, pressurizing the corrected measured main measured water pressure from the hollow cable, and indicating the zero value when the main measured water pressure is increased. Calibrating.

  Moreover, the adjustment program of the throw-in type water level meter according to the embodiment seals the end of the housing partly opened to the liquid with a pressure sensor, and connects the water pressure received from the liquid to the housing. In a detector for detecting a differential pressure with respect to the atmospheric pressure received from the inside of the housing by the hollow cable formed, and a method for adjusting a throw-in water level meter that calculates the water level of the liquid based on the differential pressure between the water pressure and the atmospheric pressure, Instructing the computer to select two water depths to measure the water pressure as the main measurement water pressure and the sub-measurement water pressure among three or more different water depths, so that the indicated value indicates the zero point when the main measurement water pressure is pressurized A step of correcting the value, a step of deriving the density of the liquid based on a difference between the main measurement water pressure and the sub-measurement water pressure and a difference between the two water depths, and a step of correcting to the main measurement water pressure measured based on the derived density , The indicated value is intended to execute the step of calibrating an indication to indicate zero when the step of pressurizing the main measurement pressure that is corrected from the hollow cable, the main measured pressure is pressurized.

  According to the present embodiment, an adjustment system for an input water level meter capable of continuing measurement without raising the detector on the water even if a malfunction occurs in a part of the submerged member of the correction means or the calibration means, and its adjustment A method, its adjustment program and an input water level meter with adjustment function are provided.

The schematic block diagram of the adjustment system of the throw-in type water level meter concerning 1st Embodiment. The schematic sectional drawing of the detector with which an injection type water level gauge is provided. The schematic block diagram of the throwing-type water level meter which the adjustment system of the throwing-type water level meter concerning 1st Embodiment makes object. The figure which shows the correspondence of the differential pressure | voltage of each pressure concerning a reference | standard pressure side diaphragm and a water pressure side diaphragm, and the indication value of the water level displayed on a display part. The figure which shows an example of the display part of the specification corresponding to the adjustment system of the throw-in type water level meter concerning 1st Embodiment. (A) is explanatory drawing of the adjustment method of the conventional throw-in type water level meter, (B) is explanatory drawing of the adjustment method concerning 1st Embodiment. Explanatory drawing of the adjustment in the adjustment method of the throw-in type water level meter concerning 1st Embodiment. The schematic block diagram of the repeater designed according to the adjustment system of the throw-in type water level meter concerning 1st Embodiment. The schematic structure figure of the member in which the adjustment system of the throw-in type water level meter concerning the 1st embodiment and the throw-in type water level meter are installed permanently. The flowchart which shows the adjustment method concerning 1st Embodiment. The partial block diagram of the adjustment system of the throw-in type water level meter concerning 2nd Embodiment. The figure which shows an example of the display part of the specification corresponding to the adjustment system of the throw-in type water level meter concerning 2nd Embodiment. The partial block diagram which shows the modification of the adjustment system of the throw-in type water level meter concerning 2nd Embodiment.

  Hereinafter, embodiments of the present embodiment will be described with reference to the accompanying drawings.

(First embodiment)
FIG. 1 is a schematic configuration diagram of an adjustment system 10 (hereinafter simply referred to as an “adjustment system 10”) for a throw-in type water level meter according to the first embodiment.
FIG. 2 is a schematic cross-sectional view of the detector 24 provided in the throwing water level gauge 20 to which the adjustment system 10 is applied.

As shown in FIG. 1 or FIG. 2, the adjustment system 10 according to the first embodiment seals the end portion of the casing 21 that is partially opened to liquid with the pressure sensor 22. a detector 24 for detecting the differential pressure ΔP between the atmospheric pressure P _atm to receive from within the pressure P _w and the hollow cable 23 connected to the housing 21 to receive the liquid, the differential pressure ΔP of the pressure P _w and atmospheric pressure P _atm 3 or more water pressure measuring devices 50 fixed to the outer surface of the detector 24 at different water depths in the adjustment system 10 of the throwing water level meter 20 having a display unit 26 for displaying the liquid level based on An allocating unit 43 for assigning a main measuring device for measuring the main measuring water pressure P _m and a sub measuring device for measuring the sub measuring water pressure P _s among the three or more water pressure measuring devices 50, the main measuring water pressure P _m and the sub measuring water pressure P the difference between _s and the main measuring instruments and sub A deriving unit 47 for deriving a density σ of the liquid based on the difference depth of the Joki, first corrects the main measurement pressure P _m measured by the main measuring device on the basis of the density σ derived by the deriving unit 47 and second correction portions 44, corrected pressure portion 45 to pressurize the primary measurement pressure P _m from the hollow cable 23, instructs the instruction value indicating the zero point when the main measurement pressure P _m is pressurized And a calibration unit 46 for calibrating the value.
In addition, the adjustment system 10 includes a first correction unit 48 that corrects the water level instruction value based on the density σ derived by the deriving unit 47.

  The “indicated value” used is not limited to a value visually recognized by an operator, and means a value recognized as a water level by the throwing water level gauge 20. However, in each embodiment, the adjustment regarding the indication value of the water level displayed on the display unit 26 will be described as an example.

[Pitching water level gauge 20]
First, the throw-in water level meter 20 to which the adjustment system 10 is applied will be described in detail with reference to FIGS. 2 and 3 (see FIG. 1 as appropriate).
FIG. 3 is a schematic configuration diagram of the throw-in type water level gauge 20 targeted by the adjustment system 10 according to the first embodiment.
The detector 24 is thrown into the liquid for measuring the water level and sinks to the bottom surface of the structure storing the liquid. As shown in FIG. 2, the detector 24 has a cylindrical outer shape, for example, by a casing 21 in which a water inlet 33 is provided on one bottom surface.

Inside the housing 21, a pressure sensor 22 is installed in the vicinity of the bottom surface where the water inlet 33 is provided so as to seal the housing 21.
The inside of the housing 21 is isolated from the surrounding liquid by the pressure sensor 22, and no liquid enters the inside further from the pressure sensor 22.

On the other hand, the hollow cable 23 is connected to the other bottom surface where the water inlet 33 is not provided. The hollow cable 23 is normally open to the atmosphere at the other end to which the casing 21 is not connected, and maintains the inside of the casing 21 at the atmospheric pressure _Patm . One surface of the pressure sensor 22 facing the inside of the sealed casing 21 receives the atmospheric pressure _Patm via the hollow cable 23.

On the other hand, the other surface in contact with the liquid in the pressure sensor 22 undergoes a pressure P _w. For example, a pressure sensor 22 using a diaphragm 25 is widely used.
The diaphragm is an elastic diaphragm, and the degree of expansion and dent of the diaphragm due to pressure is read.

  There are various methods for reading, and there are cases where reading is performed by connecting to a Bourdon tube gauge filled with oil, and the deformation is read mechanically, optically or electrically. As an electrical reading method, there are a semiconductor strain gage type in which strain is sensed by a piezoelectric element installed in the diaphragm 25 or a capacitance type in which displacement is sensed.

Incidentally, describes 2, the water pressure side diaphragm 25a which receives the water pressure P _w, and the reference pressure side diaphragm 25b which receives the atmospheric pressure P _atm from the hollow cable 23, the pressure sensor 22 having as an example.
Hereinafter, the pressure sensor 22 will be described on the assumption that a piezoelectric element is provided in each of the two diaphragms 25 and a difference between voltages generated in the piezoelectric elements is read by the difference unit 35.

  The voltage difference read by the difference unit 35 is transmitted to the V / I conversion circuit 37 as a differential pressure ΔP of the pressure received by the water pressure side diaphragm 25a and the reference pressure side diaphragm 25b. The V / I conversion circuit 37 converts this voltage difference into a current signal and outputs it to the signal line 38. The signal line 38 is covered with the covering material 28 together with the hollow cable 23 and the reinforcing wire 18, and is connected to the conversion unit 32.

In addition, this conversion part 32 is often installed in the place away from the structure where the liquid was stored, as FIG. 3 shows.
This is because many of the throw-in water level meters 20 to which the adjustment system 10 is applied are used for radiation-contaminated water.
The conversion unit 32 installed in this way performs I / V conversion on the received current signal and transmits it to the display unit 26 installed in the central control room 41, for example.

Here, FIG. 4 is a diagram showing a correspondence relationship between the pressure difference ΔP of each pressure applied to the reference pressure side diaphragm 25b and the water pressure side diaphragm 25a and the water level indication value displayed on the display unit 26.
The display unit 26 displays the electrical signal based on the differential pressure ΔP transmitted from the conversion unit 32 as the water level (36.4 m in FIG. 4) of the liquid (in the case of a liquid having a specific gravity of 1).

However, the indicated value of the water level, because it is intended to be calculated based on the pressure, such as water pressure P _w, may not the actual full water level match.
For example, when the density σ of the liquid increases depending on the type of stored liquid, the water level is displayed as deeper than the actual level.
Further, even when there is a mechanical shift in the meter built in the display unit 26, the water level is not accurately displayed.
The adjustment system 10 according to the first embodiment performs at least one of calibration and correction of the indication value of the water level on the display unit 26.

In each embodiment, “calibration of zero point (described later)” or “span calibration (second embodiment)” that confirms or corrects the suitability of the indicated value of the water level by pressurization from the pressurizing unit 45 is “calibration”. ”.
In each embodiment, the correction of the instruction value or the signal value based on the density σ is unified and expressed as “correction”.
Of the corrections, particularly, the correction and calibration based on the first correction unit 48 can be performed independently or simultaneously.

[Adjustment system 10]
Next, returning to FIG. 1, various members included in the adjustment system 10 will be described (see FIGS. 2 and 6 as appropriate).

On the outer surface of the detector 24, three or more water pressure measuring devices 50 (50 ₁ to 50 ₄ ) fixed at different water depths are installed.
Since the open ends 27 are fixed at different water depths, a water depth difference L (L ₁ , L ₂ ,..., L ₁ + L ₂ ,...) Is generated between the water depths measured by the water pressure measuring devices 50.

One water pressure measuring device 50 includes, for example, a bubbler tube 51 (a submerged member 51) whose opening end 27 is fixed to the outer surface of the detector 24, and a measuring unit that pressurizes the bubbler tube 51 to measure the back pressure. 53.
Hereinafter, in each embodiment, the water pressure measuring device 50 (50 ₁ to 50 ₄ ) will be described as being configured from the bubbler tube 51 (51 _{1 to} 51 ₄ ) and the measurement unit 53 (53 _{1 to} 53 ₄ ). .
Further, the number of water pressure measuring devices 50 is not limited as long as it is three or more, but the following description will be made assuming that four are provided as an example.

The bubbler tube 51 (51 _{1 to} 51 ₄ ) is a tube made of silicon, metal, or the like in which the opening end 27 is fixed to the outer surface of the detector 24.
When the bubbler tube 51 is additionally fixed to the ready-made detector 24, the covering material 28 may be further wrapped with the wrapping material 19 to form a single wire 29 as shown in FIG. .

The other free end of the bubbler tube 51 that opens into the atmosphere is connected to a corresponding measurement unit 53 installed in the vicinity of the conversion unit 32.
The measurement unit 53 obtains the water pressure at the open end 27 of the bubbler tube 51 by measuring the back pressure received from the connected bubbler tube 51 and conversely.

These measuring units 53 (53 _{1 to} 53 ₄ ) are all connected to the assigning unit 43.
Allocation unit 43, a main meter for measuring the water pressure P _w of the detector 24 receives from among the pressure measuring device 50 connected with the measuring unit 53 as a main measure water pressure P _m for example, assign selection by the operator.
The assigning unit 43 assigns a sub-measuring device different from the main measuring device that measures the water pressure used for deriving the liquid density σ as the sub-measuring water pressure P _s .

Here, FIG. 5 is a diagram illustrating an example of the display unit 26 having specifications corresponding to the adjustment system 10 according to the first embodiment.
The display unit 26 is provided with a measuring instrument selection button 34 including, for example, two groups of buttons, a main group and a sub group.

The button group of the main group allows the operator to select the main measuring device from a plurality of water pressure measuring devices 50 (50 ₁ to 50 ₄ ) numbered from the first to the fourth.
The sub group button group allows the worker to select a water pressure measuring device 50 other than the water pressure measuring device 50 selected as the main measuring device as the sub measuring device.

The main measuring instrument selected by the operator from the measuring instrument selection button 34 is connected to the second correction unit 44 and the deriving unit 47 via the assigning unit 43.
Similarly, the sub measuring device selected by the worker is connected to the derivation unit 47.

Then, the two water pressure measuring devices 50 specified by the selection are activated to measure the water pressure at each water depth.
More specifically, the first measurement unit 53 ₁ is the main meter, the second measurement unit 53 ₂ is identified as the sub measuring instrument.
The first measurement unit 53 ₁ and the second measurement unit 53 _2, the Baburachubu 51 connected to each ₍₅₁ 1, 51 _2), a bubble from its open end 27 to a pressurized until leakage.

This pressure, the first measurement unit 53 ₁ and the second measurement unit 53 ₂ receives the back pressure from Baburachubu 51 ₍₅₁ 1, 51 ₂₎ in the opposite.
The back pressure applied to each of the bubbler tubes 51 connected to the main measuring device and the sub measuring device becomes the measuring water pressure such as the main measuring water pressure P _m and the sub measuring water pressure P _s .

(Correction by density σ)
The magnitudes of the main measurement water pressure P _m and the sub measurement water pressure P _s are converted into electric signals and transmitted to the derivation unit 47.
Deriving unit 47 calculates the difference between these main measurement pressure P _m and the secondary measured water pressure P _s.
And based on this difference and the water depth difference L between the water depth of the main measuring device and the water depth of the sub-measuring device, the density σ of the liquid shown by the equation (1) is derived.
σ = (| P _m −P _s | / g) / L (1)
However, g represents a gravitational acceleration.

Now, the main meter a first measurement unit 53 _1, since the auxiliary instrument is a second measuring unit 53 _2, the density σ becomes the following equation (2).
σ = (| P _s1 −P _s2 | / g) / L ₂ (2)

The density σ derived in this way is displayed on the display unit 26 and transmitted to the first correction unit 48.
The first correction unit 48 uses the density σ derived by the derivation unit 47 to correct the water level indication value according to the equation (3).
L _k = (| P _w −P _atm | / g) / σ (3)
However, L _k is the true water depth of the pressure sensor 22.
The correction may be reflected manually by providing a density correction button 48a (48) on the display unit 26.

(Zero point calibration)
On the other hand, at the time of calibration, the density σ derived by the derivation unit 47 is transmitted to the second correction unit 44 connected to the derivation unit 47.
In the first embodiment, the second correction unit 44 calculates the value of the main measurement water pressure P _m based on the density σ and the water depth difference L ₁ between the opening end 27 of the bubbler tube 51 ₁ and the water pressure side diaphragm 25a. It is corrected to match the value of the water pressure P _w.

Then, the second correction unit 44 transmits the values of the main measurements pressure P _m the correction is made to the pressure portion 45.
When L ₁ = 0, the main measurement water pressure P _m and the water pressure P _w are consistent from the beginning, so that the second correction unit 44 can be omitted.
Further, the depth difference L ₁ is smaller than the depth of the detector 24 need not be provided more second correction portions 44 since the error of the influence is small due to the density sigma.

The main measured pressure P pressing 45 which receives the value of _m is normally pressurized the main measurement pressure P _m from the hollow cable 23 that is open to the atmosphere.
The main measured pressure _{P m} through the hollow cable 23, according to the reference pressure side diaphragm 25b.
Therefore, the pressure difference between the pressure applied to the hydraulic side diaphragm 25a and the reference pressure side diaphragm 25b is zero.
Therefore, the indicated value of the water level displayed on the display unit 26 at this time becomes zero when there is no deviation in the indicated value.

On the other hand, when the indicated value is not zero, the indicated value is calibrated by the calibration unit 46 connected to the display unit 26 so as to indicate the zero point.
The calibration unit 46 performs calibration at the timing of receiving a command signal from a zero point calibration button 46a (46) transmitted by an operator, for example.

As shown in FIG. 1, the calibration unit 46 is connected to the conversion unit 32 and can automatically perform calibration.
If the calibration automatically, for example, when the pressing portion 45 is pressed to the main measurement pressure P _m, at the same time signal S by transmitting, an instruction value when receiving the signal S calibration unit 46 is zero Calibration should be done to show the points.

Next, the difference in the principle of the conventional adjustment method of the throwing water level gauge 20 and the adjustment method according to the first embodiment will be described in detail with reference to FIGS. 6 (A) and 6 (B).
FIG. 6A is an explanatory diagram of an adjustment method of the conventional throwing water level gauge 20, and FIG. 6B is an explanatory diagram of the adjustment method according to the first embodiment.

Conventionally, when calibrating the indication of the water level of the display section 26, raising the detector 24 to once the water surface, the water pressure P _w according to the water pressure side diaphragm 25a was made to coincide with the atmospheric pressure P _atm.
Conventionally, since the hollow cable 23 is always opened to the atmosphere, the atmospheric pressure _Patm is always applied to the reference pressure side diaphragm 25b.
By raising the detector 24, as shown in FIG. 6 (A), the water pressure _{P w} drops _{(P w1} → _P w2).
By raising the detector 24 to the surface of the water, the pressure applied to the hydraulic side diaphragm 25a was made to coincide with the atmospheric pressure _Patm, and it was confirmed whether the indicated value indicated a zero point at this time.

On the other hand, in the adjustment method according to the first embodiment, instead of pulling the detector 24 to vary the reference pressure the main measurement pressure P _m above the reference pressure side diaphragm 25b pressurized. That is, as shown in FIG. 6 (B), raising the pressure on the reference pressure side diaphragm _{25b (P atm1 → P atm2)} , the pressure of the reference pressure side diaphragm 25b to match the water pressure _{P w.}

Here, FIG. 7 is an explanatory diagram of adjustment in the adjustment method according to the first embodiment. Figure 7 is perfectly matched with the main measuring pressure P _m in the water pressure P _w.
At this time, if the indicated value on the display unit 26 is not 0 (1.2 m in FIG. 7), this indicated value is deviated, and zero point calibration is required.

  In addition, the adjustment system 10 mentioned above can be integrated with the throw-in type water level meter 20, and it can also be set as the water level meter 40 with an adjustment function as a whole.

[Repeater 13]
Next, the repeater 13 that can be suitably used in the adjustment system 10 will be described with reference to FIG.
FIG. 8 is a schematic configuration diagram of the repeater 13 designed according to the adjustment system 10 according to the first embodiment. As described above, the electrical signal of the differential pressure ΔP is transmitted to the conversion unit 32 through the signal line 38.

  However, since most of the water level gauges 20 to which the adjustment system 10 is applied are applied to radiation-contaminated water, the water level is managed remotely. Therefore, it is assumed that the signal line 38 is extended by the extension signal line 38a and connected to the conversion unit 32 installed away from the structure storing the radiation contaminated water.

The free end of the signal line 38 is passed through and fixed to the signal line hole 14 having the connector 14a of the repeater 13 at a place where at least an operator can enter for a short time, such as a liquid inlet.
The repeater 13 is provided with an air release hole 15 to which a hollow cable 23 is connected. Nothing other than the hollow cable 23 is normally connected to the air opening hole 15, and the hollow cable 23 is open to the atmosphere.

However, in calibrating the regulation system 10, by connecting a pressurizing 45 in the hollow cable 23, it is necessary to pressurize the primary measurement pressure P _m. Therefore, a connector 15 a is provided in the atmosphere opening hole 15 so that the extended hollow cable 23 a can be easily connected to the hollow cable 23.

Furthermore, in order to acquire the values of the main measurement water pressure P _m and the sub measurement water pressure P _s , it is necessary to connect a plurality of bubbler tubes 51 to the corresponding measurement units 53. Therefore, the relay 13 is provided with a back pressure hole 16 for fixing the bubbler tube 51 and its connector 16a.
At the time of calibration, the extension bubbler tube 52 (52 _{1 to} 52 ₄ ) is connected to the back pressure hole 16 and connected to the corresponding measurement unit 53 via the extension bubbler tube 52.
As shown in FIG. 8, the back pressure holes 16 may be provided in the same number as the number of the bubbler tubes 51, or a plurality of the bubbler tubes 51 may be fixed together.

Further, any connector (14a, 15a, 16a) does not have to be a single component as shown in FIG. 8, and may be integrated with each connection hole (14, 15, 16).
Thus, by providing the repeater 13 including the signal line hole 14, the air release hole 15, and the back pressure hole 16, the adjustment system 10 can be connected in a short time during calibration. That is, the exposure of workers can be minimized.

[Adjustment method]
Next, an adjustment method according to the first embodiment will be described with reference to the flowchart of FIG. 10 (refer to FIGS. 1, 2 and 9 as appropriate).
FIG. 9 is a schematic configuration diagram of the permanently installed members of the adjustment system 10 and the throw-in water level gauge 20 according to the first embodiment.

  The target water level gauge 20 has a detector 24 sinking to the bottom of a structure storing a liquid whose water level is detected. In the detector 24, a plurality of bubbler tubes 51 are installed with their open ends 27 fixed to the outer surface of the detector 24. The free end of the bubbler tube 51 is connected to the repeater 13. Further, the hollow cable 23 is open to the atmosphere in the open air hole 15 of the repeater 13.

  On the other hand, the signal line 38 is connected to the conversion unit 32 by the extension signal line 38 a even when not calibrating, and transmits the detected electric signal of the differential pressure ΔP to the conversion unit 32. The electrical signal received by the conversion unit 32 is sent to the display unit 26 installed in the central control room 41 or the like, and is monitored by the worker as the water level.

First, the adjustment system 10 is connected to such an input water level gauge 20 (S11).
Specifically, first, an operator connects the extended bubbler tube 52 to the back pressure hole 16 of the repeater 13 and connects the bubbler tube 51 and various members such as the measurement unit 53.
At the same time, the calibration unit 46 is connected to the conversion unit 32 and the display unit 26.

Then, assign a sub measuring device for measuring the primary instrument and vice measured water pressure P _s from among the installed hydraulic meter 50 (S12).
As described above, the measuring device selection button 34 may be provided on the display unit 26 and the operator may select the button, but the allocation unit 43 may automatically select it.

Suppose first measurement unit 53 ₁ is the main meter, the second measurement unit 53 ₂ is identified as the sub measuring instrument.
The first measurement unit 53 ₁ and the second measurement unit 53 ₂ is pressurized to Baburachubu 51 connected to respectively measure the back pressure as the primary measure water pressure _{P m} and the sub measured pressure _{P s} (S13).
Next, the main measurement pressure P _m and the density of the liquid σ based on the sub measuring pressure P _s and the differences and the first measuring unit 53 ₁ and the second expression from the depth difference L ₂ of the measuring unit 53 ₂ (1) Derived (S14).

The value of the density σ is displayed on the display unit 26 and transmitted to the first correction unit 48.
And the 1st correction | amendment part 48 correct | amends to the instruction | indication value of a water level by Formula (3) using the density (sigma) derived | led-out by the derivation | leading-out part 47 (S15).
The second correcting unit 44, based on the density σ and depth difference _{L 1,} and the correction in the main measurement pressure _{P m,} to the main measurement pressure _{P m} is coincident with the water pressure _{P w} (S16).

The main measurement water pressure P _m that matches the water pressure P _w is transmitted from the second correction unit 44 to the pressurization unit 45.
Pressurizing 45 pressurizes the main measuring water pressure _{P m} to a reference pressure side diaphragm 25b (S17).
At this time, if there is no deviation in the indication value of the water level on the display unit 26, this indication value becomes zero.
If the indicated value is not the zero point, the calibration unit 46 calibrates the indicated value to indicate the zero point (S18).

  As described above, according to the adjustment system 10 and the adjustment method according to the first embodiment, the density σ of the liquid to be stored is obtained remotely, and the indication value of the water level is calibrated according to the density σ. Can do.

As described above, according to the regulation system 10 according to the first embodiment, by applying the pressure P _w same pressure and that the reference pressure side diaphragm 25b pressure side diaphragm 25a is subjected, without raising the detector 24 to the water Calibrate the indicated value.
Further, the first correction unit 48 corrects the indication value of the water level of the display unit 26 in consideration of the density σ of the liquid whose water level is measured.

And the adjustment system 10 makes the water depth of the water immersion member 51 differ among these calibration means and correction | amendment means, and makes the water pressure measuring instrument 50 containing these water immersion members 51 share with a calibration means and correction | amendment means.
Then, any two of the three or more shared water pressure measuring devices 50 are remotely assigned as a main measuring device or a sub measuring device and used for calibration or correction.

Therefore, for example, even if seven of the nine water pressure measuring devices 50 have a problem, the above measurement can be continued if the remaining two are normal.
In addition, since any of the nine water pressure measuring devices 50 can be a main measuring device or a sub measuring device, the calibration means and the correcting means can be efficiently made redundant with the minimum water pressure measuring device 50. it can.

  As described above, according to the adjustment system 10 according to the first embodiment, even when a problem occurs in the submerged member 51 of the correction unit or the calibration unit, the measurement can be easily performed with the minimum number of members without lifting the detector 24 on the water. Can continue.

(Second Embodiment)
FIG. 11 is a partial configuration diagram of the adjustment system 10 according to the second embodiment.
In FIG. 11, the second correction unit 44 shown in FIG. 1 is omitted.
Moreover, FIG. 12 is a figure which shows an example of the display part 26 of the specification corresponding to the adjustment system 10 concerning 2nd Embodiment.

As shown in FIG. 11 or FIG. 12, the adjustment system 10 according to the second embodiment _applies a plurality of index pressures P _{c in} the range from the atmospheric pressure P _atm to the water pressure P _w to the detector 24 via the hollow cable 23. An index pressure adding section 54 that pressurizes (P _{c1 to} P _c5 ), a reference pressure gauge 36 that is connected to the index pressure adding section 54 and detects a differential pressure ΔP _c between the index pressure P _c and the main measurement water pressure P _m ; .

  When strictly confirming whether or not the indicated value on the display unit 26 is appropriate, in general, the zero point calibration shown in the first embodiment is not sufficient. Even if the indicated value becomes 0 when the differential pressure ΔP applied to the two diaphragms 25 is 0, it is not guaranteed that the indicated value becomes an accurate value when the differential pressure ΔP becomes a value other than 0. is there.

  That is, when the indicated value on the display unit 26 is strictly calibrated, in addition to the zero point calibration, it is necessary to perform so-called span calibration for confirming whether the indicated value for the differential pressure ΔP other than 0 is appropriate. Therefore, the adjustment system 10 according to the second embodiment includes the index pressure adding unit 54 and the reference pressure gauge 36 as described above.

The index pressure adding unit 54 applies a plurality of index pressures P _c from the atmospheric pressure P _atm to the water pressure P _w to the detector 24. For example, as shown in FIG. 11, the index pressure adding unit 54 is a pressurizing pump 54 a (54) to which the reference pressure gauge 36 is connected.

The aforementioned reference pressure switching valve 31 installed in the extension hollow cable 23a is a three-way valve or the like.
At the time of calibration, the two connection holes of the reference pressure switching valve 31 are connected to the pressurizing unit 45 on one side, and the other is opened to the atmosphere, so that the reference pressure applied to the reference pressure side diaphragm 25b is appropriately switched.

  When the span calibration of the second embodiment is performed, a span switching valve 42 of a three-way valve is also connected to the connection hole on the atmosphere opening side. An index pressure adding unit 54 is connected to the span switching valve 42 together with the reference pressure gauge 36.

As shown in FIG. 11, the reference pressure gauge 36 is a value of the differential pressure ΔP _c between the index pressure P _c pressurized by the index pressure adding unit 54 and the back pressure or a value obtained by converting the differential pressure ΔP _c into a water level. Is displayed (in FIG. 12, 17.3 m). When the value of the reference pressure gauge 36 is regarded as accurate and the indicated value on the display unit 26 is deviated from the display of the reference pressure gauge 36 (19.2 m in FIG. 12), the indicated value on the display unit 26 Calibrate.

  Calibration of the display unit 26 is performed manually while an operator of the central control room 41 visually recognizes the reference pressure gauge 36. Alternatively, the reference pressure gauge 36 may be connected to the conversion unit 32 and the calibration unit 46 connected to the conversion unit 32 may be automatically calibrated.

Next, a modification is demonstrated using the partial block diagram which shows the modification of the adjustment system 10 concerning 2nd Embodiment of FIG.
Also in FIG. 13, the second correction unit 44 is omitted.

In the modification of the adjustment system 10, the index pressure adding unit 54 is a pressure adjusting unit 54 b (54) connected to the conversion unit 32 and the pressurizing unit 45 instead of the pressurizing pump 54 a.
For example, the pressure adjusting unit 54 b adjusts the pressure output from the pressurizing unit 45 to the index pressure _Pc and pressurizes the reference pressure switching valve 31. At the same time, a differential pressure ΔP _c between the pressurized indicator pressure P _c and the back pressure is transmitted to the conversion unit 32 and automatically calibrated by the calibration unit 46 connected to the conversion unit 32.
In this case, the reference pressure gauge 36 is a member or a program built in the pressure adjusting unit 54b.

Of course, the index pressure _Pc to be pressurized by the span calibration button 46b (46) provided in the display unit 26 may be determined without being completely automated. In this case, the determined index pressure _Pc is transmitted to the pressure adjustment unit 54b via the conversion unit 32. Thus, by using the index pressure adding unit 54 as the pressure adjusting unit 54b, span calibration can be fully automated or semi-automated.

  As described above, in the second embodiment, span calibration for calibrating an instruction value other than the zero point can be performed.

Since the second embodiment has the same structure and operation procedure as those of the first embodiment except that the instruction value other than the zero point is calibrated, a duplicate description is omitted.
Also in the drawings, portions having a common configuration or function are denoted by the same reference numerals, and redundant description is omitted.

  According to the adjustment system 10 of at least one embodiment described above, even when a malfunction occurs in the submerged member 51 of the correction unit or the calibration unit, the measurement can be easily performed with the minimum number of members without lifting the detector 24 on the water. It is possible to continue.

Although several embodiments of the present invention have been described, these embodiments are presented by way of example and are not intended to limit the scope of the invention.
These embodiments can be implemented in various other forms, and various omissions, replacements, changes, and combinations can be made without departing from the scope of the invention.
These embodiments and their modifications are included in the scope and gist of the invention, and are also included in the invention described in the claims and the equivalents thereof.

DESCRIPTION OF SYMBOLS 10 ... Adjustment system (adjustment system) of throw-in type water level gauge, 13 ... Repeater, 14 (14a) ... Signal wire hole (connector), 15 (15a) ... Air release hole (connector), 16 (16a) ... Back Pressure hole (connector), 18 ... reinforced wire, 19 ... wrapping material, 20 ... throw-in type water level gauge, 21 ... housing, 22 ... pressure sensor, 23 (23a) ... hollow cable (extension hollow cable), 24 ... Detector 25 (25a, 25b) ... diaphragm (hydraulic pressure side diaphragm, reference pressure side diaphragm), 26 ... display section, 27 ... open end, 28 ... covering material, 29 ... wire, 31 ... reference pressure switching valve, 32 ... Conversion part 33 ... Water inlet, 34 ... Measuring instrument selection button, 35 ... Difference part, 36 ... Reference pressure gauge, 37 ... V / I conversion circuit, 38 (38a) ... Signal line (extension signal line), 40 ... Adjustment Water level meter with function, 41 ... Central control room, 4 ... Span switching valve, 43 ... Allocation unit, 44 ... Second correction unit, 45 ... Pressure unit, 46 (46a, 46b) ... Calibration unit (zero point calibration button, span calibration button), 47 ... Derivation unit, 48 (48a) ... first correction section (density correction button), 50 ... pressure meter, 51 ₍₅₁ 1 to 51 ₄₎ ... Baburachubu (flooded member), 52 ₍₅₂ 1 to 52 ₄₎ ... extension Baburachubu, 53 (51 _{1 to} 51 ₄ ) ... measurement unit (first measurement unit to fourth measurement unit), 54 (54a) ... index pressure addition unit (pressurization pump, pressure adjustment unit), L (L ₁ , L ₂ , L ₃ ,..., L ₁ + L ₂ ,...) ... Water depth difference, P _atm ... Atmospheric pressure, P _c ... Indicator pressure, P _m ... Main measurement water pressure, P _s ... Sub-measurement water pressure, P _w ... Water pressure, S ... Signal , [Delta] P ... differential pressure, the differential pressure from the [Delta] P c _... indicators pressure, sigma ... density.

Claims (13)

Three or more water pressure measuring devices fixed at different depths to the outer surface of the detector thrown into the stored liquid;
An allocating unit for allocating a main measuring device for measuring the main measuring water pressure and a sub measuring device for measuring the sub measuring water pressure among the three or more water pressure measuring devices;
A derivation unit for deriving the density of the liquid based on the difference between the main measurement water pressure and the sub measurement water pressure and the difference in water depth between the main measurement device and the sub measurement device;
And a first correction unit that corrects an indication value of the water level based on the density derived by the deriving unit. The end of the housing partly opened to the liquid is sealed with a pressure sensor, and the atmospheric pressure received from the inside of the housing by the water pressure received by the pressure sensor from the liquid and the hollow cable connected to the housing A detector for detecting a differential pressure between the water pressure and the atmospheric pressure.
Three or more water pressure measuring devices fixed at different water depths to the outer surface of the detector;
An allocating unit for allocating a main measuring device for measuring the main measuring water pressure and a sub measuring device for measuring the sub measuring water pressure among the three or more water pressure measuring devices;
A derivation unit for deriving the density of the liquid based on the difference between the main measurement water pressure and the sub measurement water pressure and the difference in water depth between the main measurement device and the sub measurement device;
A second correction unit that corrects the main measurement water pressure measured by the main measuring device based on the density derived by the deriving unit;
A pressurizing unit that pressurizes the corrected main measurement water pressure from the hollow cable;
And a calibration unit that calibrates the indicated value so that the indicated value of the water level indicates a zero point when the main measurement water pressure is increased. The adjustment system of the throwing-type water level meter according to claim 2, further comprising a first correction unit that corrects the indicated value of the water level based on the density derived by the deriving unit. The water pressure measuring instrument is
A bubbler tube having an open end fixed to the outer surface of the detector;
A measuring unit that pressurizes the bubbler tube to measure back pressure, and
The adjustment system of the pouring water level meter according to any one of claims 1 to 3, wherein the main measurement water pressure and the sub measurement water pressure are the back pressure. 5. A reference pressure switching valve that is installed on the hollow cable and switches the hollow cable between a connection state to the pressurizing unit and an open state to the atmosphere. The adjustment system of the throw-in type water level meter as described in the paragraph. An indicator pressure adding unit that applies a plurality of indicator pressures from the atmospheric pressure to the water pressure to the detector via the hollow cable;
The reference pressure gauge connected to the index pressure adding unit and detecting a differential pressure between the index pressure and the main measurement water pressure is provided. Immersion water level meter adjustment system. The index pressure adding unit is a pressure pump,
7. The injection according to claim 6, further comprising a span switching valve that is connected to the reference pressure switching valve and switches the inside of the detector between a connection state to the pressure pump and an open state to the atmosphere. Water level gauge adjustment system. The end of the housing partly opened to the liquid is sealed with a pressure sensor, and the atmospheric pressure received from the inside of the housing by the water pressure received by the pressure sensor from the liquid and the hollow cable connected to the housing A detector for detecting a differential pressure with
A display unit for displaying the liquid level based on the differential pressure;
Three or more water pressure measuring devices fixed at different water depths to the outer surface of the detector;
An allocating unit for allocating a main measuring device for measuring the main measuring water pressure and a sub measuring device for measuring the sub measuring water pressure among the three or more water pressure measuring devices;
A derivation unit for deriving the density of the liquid based on the difference between the main measurement water pressure and the sub measurement water pressure and the difference in water depth between the main measurement device and the sub measurement device;
A second correction unit that corrects the main measurement water pressure measured based on the density derived by the deriving unit;
A pressurizing unit that pressurizes the corrected main measurement water pressure from the hollow cable;
And a calibration unit that calibrates the indicated value so that the indicated value of the water level indicates a zero point when the main measurement water pressure is increased. The water pressure measuring instrument is
A bubbler tube having an open end fixed to the outer surface of the detector;
A measuring unit that pressurizes the bubbler tube to measure back pressure, and
9. The throwing water level meter with adjustment function according to claim 8, wherein the main measurement water pressure and the sub measurement water pressure are the back pressure. Regulatory function throw of claim 9, characterized in that it comprises a signal line holes, repeater having a back pressure hole for fixing the Baburachubu fixing the signal lines for transmitting the differential pressure in the form of an electrical signal Built-in water level gauge. The pressure sensor seals an end of the opened casing and receives the water pressure in the liquid, and is connected to the casing by being disposed inside the sealed casing 11. A throw-in type water level meter with an adjustment function according to claim 8, further comprising a reference pressure side diaphragm that receives atmospheric pressure from the hollow cable. The end of the housing partly opened to the liquid is sealed with a pressure sensor, and the atmospheric pressure received from the inside of the housing by the water pressure received by the pressure sensor from the liquid and the hollow cable connected to the housing In a method for adjusting a water level meter, and a detector for detecting a differential pressure between the water pressure and the atmospheric pressure, the water level of the liquid is calculated based on the differential pressure between the water pressure and the atmospheric pressure.
Selecting two water depths to measure the water pressure as a main measurement water pressure and a sub-measurement water pressure among three or more different water depths;
Deriving the density of the liquid based on a difference between the main measurement water pressure and the sub measurement water pressure and a difference between the two water depths;
Correcting to the main measured water pressure measured based on the derived density;
Pressurizing the corrected main measurement water pressure from the hollow cable;
And a step of calibrating the indicated value so that the indicated value of the water level indicates a zero point when the main measurement water pressure is increased. The end of the housing partly opened to the liquid is sealed with a pressure sensor, and the atmospheric pressure received from the inside of the housing by the water pressure received by the pressure sensor from the liquid and the hollow cable connected to the housing A detector for detecting a differential pressure with
In the adjustment program of the throwing water level meter that calculates the water level of the liquid based on the differential pressure between the water pressure and the atmospheric pressure,
On the computer,
Selecting two water depths for measuring the water pressure as a main measurement water pressure and a sub-measurement water pressure among three or more different water depths;
Deriving the density of the liquid based on a difference between the main measurement water pressure and the sub measurement water pressure and a difference between the two water depths;
Correcting to the main measured water pressure measured based on the derived density;
Pressurizing the corrected main measurement water pressure from the hollow cable;
An adjustment program for a throw-in type water level meter, comprising: calibrating the indicated value so that the indicated value of the water level indicates a zero point when the main measurement water pressure is increased.

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