JPS59111021A - Sensor for storage tank which can be filled with liquid - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The invention relates to a sensor in a storage tack, in particular capable of being filled with a flammable liquid, according to the preamble of claim 1.

A sensor of this type is known from DE 2944076 A1. According to the continuous measurement method for level detection in storage tanks which can be carried out in this way, a resistance wire tensioned in the form of 1J is used over the measuring path, from which a slider is connected. Take out the resistance value proportional to the level. However, a disadvantage of this known method is that the accuracy and stability of the measured values decrease over time.

The cause is a mechanically tensioned resistance line. The resistance wire may be wired or stretched, for example, so that it is in electrical contact with the guide tube. Moreover, such resistance wires have neither temperature compensation nor monitoring devices, so that known measuring systems are not suitable, taking into account the low contact force between the contact device and the resistance wire, which can lead to time-varying surfaces and contact resistances and therefore false measurements. fulfills only a small part of the calibration regulations for measuring devices for measuring the volume of liquids.

A further disadvantage is that mechanically tensioned resistors can only be used up to a maximum guide tube length of 6 m for safety reasons.

Filling of the storage tank with resistance # also by electrical regulating means! It is impossible to match the temporal curve.

A further drawback of known hinges is that they use flap floats that are hollow and relatively thin in order to reduce their own weight. During long-term practical use, the structure will gain weight due to diffusion of the filling medium. Furthermore, taking into account the generally unavoidable floating resistance, such as particulate impurities in the filling medium or longitudinal soldering or welding of the guide tube, the flap float easily remains suspended. The lack of supplemental buoyancy makes them unsuitable for media of lower specific gravity than superfuels.

Its use in pressure-loaded storage tanks is not possible as it does not have the required pressure resistance.

Finally, the known flap float system has an inner diameter Z on the lid of the dome.
It can only be used when it has a tapped hole of 50.4 mm or more. Furthermore, adjacent training instruments must not touch each other. If the hole in the dome lid is small, the flap float must be formed with a small volume depending on f'L, and the required buoyancy can no longer be obtained.

Therefore, the object of the invention (d) is to provide a calibration specification for a measuring device for liquid volume measurement which can be used for all types of tanks and media used, in particular flammable liquids, and with respect to the accuracy and definiteness of the measured values. The objective is to improve the known sensor so that it satisfies all of the following conditions.

This object is solved according to the invention by the features of patent claim 1.

Resistance path (-J, is a direct component of a profiled rail connected under clamping stress to two mutually parallel profiled rails located in the longitudinal central plane inside the guide tube.The resistance track therefore has a stable support. Therefore, the resistance value of the resistance line does not change, as is the case with known methods, where mechanical tensioning of the line and thus possible undulation or contraction is unavoidable.

The electrical behavior of the profiled bar and the single resistance path has already been determined by the manufacturer, e.g. by electrons or laser beams, in accordance with the filling characteristic curve of the respective storage tank. linear) or volume-appropriate functional behavior (volume-linear).

Thus, for example, an accurate and reproducible calibration value of the stored liquid volume can be obtained using a calibration table of a volumetric tank of the same construction. The unit of measure used in this case can be expressed in liters, points, or parts, taking into account that a level difference of 1 liter at the center of an ordinary tank with a capacity of 200,001 liters corresponds to about 20 liters.

According to the invention, a computer program (software) takes into account the inclination position of the storage tank in addition to the inclination adjuster in the connection head of the sensor.
can be used easily. For example, if the resistance path has already been adjusted at the factory to indicate the volume depending on the tank type, the downstream output device (display, printing device) can be read directly in liters, points or units or via a simple computer program. Storage volume or mass can be determined mathematically.

By integrating the resistance path into the profiled bar, the prerequisites for satisfactory parallel guidance of the contact slide are obtained.

Measurements and reproduction of values are accurate. The mechanical strength of the system is high;
At the same time a satisfactory electrically adjustable and calibratable structure is obtained.

Overfilling can be detected satisfactorily through level measuring technology detection.

The values determined using measurement technology can be transmitted remotely via a homogeneous interface, in which case multi-conductor technology connections can be used to eliminate line resistances.

The possibility of using the sensor according to the invention in all existing storage tanks, especially in service station tanks, arises from the fact that only the guide tube needs to be inserted through the hole in the dome lid. The float is designed to be insertable, so that when installing the sensor it is introduced into the storage tank through a filling hole with a significantly large diameter, and then the guide and H
You can insert and attach it to this.

The magnetic coupling between the inner and outer magnet systems is then automatically achieved within the storage tank by pulling the guide tube once up just before the lid of the dome.

Removal of the dome lid is therefore not necessary during the initial installation of the tank, nor during subsequent installation onto an existing storage tank, nor during any necessary maintenance.

External soldering or welding along the measuring path is avoided by means of a profiled rail arranged inside the guide tube. Thereby, there is no resistance that prevents the 70-tooth from flying. The guide tube can be formed sufficiently long above the dome lid so that no liquid can enter, even to prevent flooding of the manhole.

The upper end of the guide tube can be adjusted to the height of the operating device to facilitate simple electrical connection or manual operation.

The stability of the guide tube is adapted to the permissible bending as a function of its length, the transverse forces occurring inside the storage tank during filling, and the magnetic system used, which has a high magnetic coupling force. Due to this stability, no difficulties arise when using the guide tube in storage tanks with measuring paths longer than 3 m. Additionally, level sensing is temperature independent.

According to an advantageous embodiment of the invention, the profiled rail is connected to the guide tube.
Forms the components of the body. In this case, the guide tube is preferably made of pultruded, non-ferromagnetic, weldable and solderable special steel.

According to another embodiment, the profiled rail is a component of an inner tube inserted into an outer tube. In this case, the inner tube, which is selected to have a small wall thickness, is made of plastic, for example.

The metal outer tube protects the inner tube against bending, torsion and compressive forces.

In both embodiments, no difficulties arise in connecting the profiled pars with the required stability to the profiled rails.

According to the invention, the profiled i/-rule is formed in the form of a channel with an approximately square cross section. In this case, the profiled rail is provided with clamping fins pointing inwardly or outwardly at right angles to the longitudinal center plane.

The hollow box-like formation creates a space that can be used to accommodate other transmitters and necessary wiring. Especially if the clamping fins face outward, this is a closed passage. If the clamping fins face inward, the passage opens towards the central axis of the guide tube.

According to another feature of the invention, the profile bar is extruded and captures on its side a guide groove for the contact slide. The material for the irregularly shaped bar is glass fiber and/or
:'+7 ester material is used. During molding, not only is a profile bar produced that exactly fits into the hoop of the profile rail, but also a precise guide groove for the contact slide is formed, which ensures a low q-friction in the slide track. Furthermore, during manufacturing, if necessary, the return line of the resistance path can be drawn directly into the profiled par.

The necessary connection of the second part and the F part depending on the circuit type of the resistance path is generally carried out by soldering or bath welding. In order to reduce the friction resistance, the contact slider is provided with a ball on the side facing the profiled bar that is lowered into the guide groove of the profiled bar. The web extending between the profiled bars is one of the contact sliders.
1t! l Combine two contact sliders that hold the magnet system,
It is formed to minimize the frictional contact of the ball in the inner groove.

According to another embodiment of the invention, the resistance paths are formed by strip-shaped metal strips, in particular noble metal strips, in each case one
Pressure is applied to the mutually contacting surfaces of the irregularly shaped bars so that the surfaces of each pair are facing each other.

Such metal IJ tubes are attractive in that they have properties such as corrosion resistance, different layer formation, temperature constant, and aging stability that can be maintained at a constant Vc. For example, resistance alloy Ag/pd-40
A good tetraelectric material of the /60 or Ag/An type is used. Such a resistance can also be adjusted precisely and relatively easily.

According to another feature of the invention, each profile bar has two laterally separated and parallel resistance paths, between which each one low resistance tag zero line is inserted in the form of a metal strip. Ru. This tap line serves as a potentiometer tag. For this purpose it is possible to fasten a slider in contact with the tap line to the web of the tangent slider.

According to the invention, it is also possible to draw the return line of the resistance path into the irregularly shaped bar. Retraction can be carried out directly during the molding of irregularly shaped bars.

According to an example of an advantageous sister of the present invention, it is possible to improve the IQ! l! Four contact devices in the form of a slider, cross-coupled to each other in the form of a bridge comparator circuit, are fixed to the web of the slider in contact with the four resistance paths. By using a self-monitoring comparator circuit that is connected to the differential circuit, the connection monitoring and the error reporting by the bridge circuit are possible. Unexpected resistance changes, which can occur, for example, due to corrosion of the resistance paths or fatigue of the contact devices over time, have no real effect anymore, since the resistance differences are compensated inside the bridge without any false measurements. .

Resistive bridge circuits are therefore particularly advantageous for monitoring and/or calibratable level detection or volume measurement.

Automatic monitoring of the resistance bridge can be combined with optical and/or audible indicators.

The circuit according to the invention can be easily adapted subsequently to the requirements of the respective user by varying the contact of the slider threads.

The contact device, which may also be a slider, forms a unit with the inner magnet system and has a recess for the lower slider of the iron Glock V parallel to the lower slider of the contact slider.

Furthermore, it is advantageous according to the invention to form the float from a float body which can be inserted into one another with the double-print plain bearing and the plain bearing shell, including the outer magnet system.

This configuration allows the float to be removed via a filling hole in the dome lid to a guide tube inserted into the storage tank. There is no need to remove the lid of the dome.

The plain bearing shell immediately has low friction against the guide tube,
In addition, the filling medium is made of chemically neutral plastic. The outer magnet system is preferably embedded in the plastic.

The float body is also designed in particular in such a way that the plastic material behaves chemically neutrally with respect to the filling medium.

The interlocking connection between the float body and the plain bearing shell is formed such that relatively little force is required to connect the float body and the plain bearing nonyl during the manual insertion process through the fill hole. On the other hand, a large amount of force is required to disassemble the float from the sliding bearing shell.

It is advantageous to provide six floats 120° apart from each other on the circumference of the plain bearing.

In this connection, it is advantageous to connect the plain bearing shells on one side by a hinge and on the other side to each other by means of a locking device.

Although the hinge and the adjustment device have dimensional tolerances due to in-house corrections, they are formed in such a way that sufficient measurement stability is expected in the sense of inspection and inspection. The float can freely rotate around the IM% inner tube, which is disturbed by filling.

Do not touch adjacent equipment.

At least one leg spring is disposed on the hinge.

This spring serves, together with the locking device, to ensure that the two sliding bearing shells satisfactorily surround the guide station in the assembled state and remain in this operating position.

The protection of the sensor in pressure-loaded storage tanks is ensured by the use of a cell-rigid foam for the light of the float body, which is formed as a plastic injection molding 517. As a result, a high buoyancy force and an auxiliary buoyancy force due to volume displacement are exerted even in liquids of low specific gravity.

According to the present invention, the sliding bearing provides a ``drowsy contact spring'' for many people in the industry. This spring is drowsily coupled to the magnetic system.

According to another embodiment of the invention, the outer magnet system consisting of a large number of individual magnet blocks is made of a circular tube of 10,000 yen or a polygonal tube piece 11i! A float body consisting of a surface-pressure plastic link installed in I and holding the nn magnetic A form is inserted into a locking hole on the circumferential surface 4). The magnet is placed on two planes above the insertion hole of the float body.

In particular, six magnet blocks are arranged uniformly at 60° from each other in the valley plane. When replacing a circular tube piece, grind the magnet block +1L so that the tube side surface comes into close contact with the tube.
There must be. This kind of processing is unnecessary when using one polygon/neck piece.

The height and surface area of the tube piece is only about 1/3, and the material is, for example, 5T37.

According to another advantageous feature of the invention, the guide tube is provided with a threaded member having an external thread of 11/4" for fixation to the lid of the dome, and a sleeve nut having an external thread of a large inch is mounted thereon. Can be screwed down.

1 of the tank incorporating one guide tube stored thereby.
” It can be used for 1 history regardless of stubbornness.

The sleeve nut ensures the required fit.

Since only 11/, J/, 11" and 2" holes are used in the actual dome lid, this method covers all installation situations that occur in practice.

According to another embodiment of the basic idea of the invention, a connection head is arranged in the row 5g with a correction device for the upper and lower resistances, which responds manually or automatically to the tank loading position. The correction device immediately forms a component of an explosion-proof terminal box with integrated conductor plates. The terminal box is equipped with a permanent terminal for the cable and can be sealed with a Phillips screw.

An integrated conductor plate (for example, in the form of a button/ohmmeter) includes a stepless slope adjuster and a termination impedance.

The tilt adjuster is immediately mechanically connected and acts on any necessary adjustment when the storage tank is in the swiveling or tilting position. Filling rm,! i! It is also possible to achieve a parallel movement of the measuring range around the zero point of . The sliding width is sufficiently wide so that it also complies with the actual values of deformed storage tanks that have already been in use for a long time. The inclination adjustment 6 is advantageous as soon as a new volume adjustment is avoided by comparison with the existing water level bar scale.

A tilt adjuster for upper level adjustment and lower level adjustment is present in the connection head. The termination impedance, in conjunction with the conductor capacitance, must ensure a high-frequency shadow-free sensor.

This is because, in reality, the length of the connected wire often forms an antenna, causing false measurements.

According to the present invention, it is also possible to replace the first inclination adjuster with a fixed grinding post and adjust it step by step using a switch.

Another advantageous feature is that it has a display and operating unit arranged closely in the recess 1 of the sensor, which can be operated in a self-contained manner, i.e. without an ambush cable. .

The measured values can be intermediately stored, for example by using a microprocessor, and can be retrieved if necessary manually by an operator or automatically via a cable if a remote transmission connection is arranged.

With this intelligent sensor, a technically repeatable calibration is carried out during regular fillings (C), so that only the g-product of the medium (fuel) actually filled into the tank is accounted for.

If the sensor is configured as a passive transmitter, an external control device takes over the functionality described above.

The sensor is constructed to be explosion-proof.

According to another feature of the invention, a temperature measurement value transmitter is arranged in the guide tube. This transmitter is immediately inserted into the area of the guide tube's explosion seam 70 and is connected to the periphery of the guide tube, for example by means of a stiffener 5.

Wll'L degree d11] The fixed value transmitter is introduced into the oil passage of the special rail, for example, and is installed at the bottom AK of each storage tank location within the explosion 1-70. PT in a metal-ceramic casing as a temperature measurement value transmitter
100 oscillators are used in mattouchi conductor technology. Furthermore, this transmitter can be designed to function as a level limit value signal transmitter.

If a limit value transmitter is arranged in the guide tube according to the invention, it is also inserted into the guide tube and connected around the guide tube, in particular by means of hard solder. According to an advantageous embodiment, a TC/NTC resistor)) is arranged in the metal-ceramic housing.

Furthermore, according to the invention it is proposed to arrange a groundwater protection transmitter in the guide pipe. Such a groundwater protection transmitter is then installed in the so-called explosion zone 1, ie in the manhole, in a guide pipe directly above the dome cover. Its purpose is to report water and/or fuel flooding in the manhole.

The groundwater protection transmitter can be inserted into the guide tube and connected to the periphery of the guide tube by hard solder.

According to a further feature of the invention, the contacting wash head is provided with a sensor identification transmitter. A separate ohmic resistor is provided for this purpose. The characteristics of each sensor can be checked at any time using the sensor identification transmitter.

1. It must be ensured that all transmitters do not come into any contact with the guide pipe or, if applicable, the tank base of the bleaching corrosion protection device.

Next, the present invention will be explained with reference to the drawings.

1 and 2 a storage tank 1 for fuel 2 is shown, for example as used in a service station.

The tank 1 is formed in a cylindrical shape and has a spherical end face 3.

The tank is placed on the ground surface as an underground tank.

exists at a certain distance a from The storage tank 1 comprises a so-called dome 4 which is closed off by a lid 5 at 1y1M.

Manhole 6 indicated by underground ERK chain d to approach lid 5
is formed. Tank 1 is approximately 0.5-1 to horizontal line H
It will be buried in the underground ER at an angle of .

The lid 5 serves to support a sensor γ, with which the level of the fuel 20 in the storage tank 1 and the temperature of the fuel 2 can be measured. Furthermore, the sensor 1 is configured to report the flooding of the manhole by water and/or fuel 2. A close-read head 8 in the form of a terminal box is provided on the top of the sensor γ, and this head can be equipped with an indicator and an operator (not shown). The terminal box 8 also comprises a transmission connection, by means of which it is possible to transmit the obtained data to the central control station or to receive control commands originating from the control unit.

As shown in Fig. 5, in addition to the central threaded hole 9 for fixing the sensor 1 to the dome, the lid 5 has another hole that has been shifted outward by a half-inch.
Two holes 10 are provided, which holes are used for filling the storage tank 1 by means of a filling pipe. 11 is the lid 5 dome 4
12 indicates a position where a filling pipe flange (not shown) is fixed to the filling hole 10.

The sensor 1 comprises a rope guide tube 13 (FIG. 4).

For example, non-ferromagnetic austinitic stainless steel is used as the material. Guide g13 to screw hole 9 of lid 5
(see also FIGS. 1 to 3), a screw element 14 (FIG. 5) is used which is inserted into the upper region of the guide tube and is fastened to the guide tube 13. The threaded member 14 has a sufficiently long cylindrical guide portion 15.11/4″ (51
, 75 mm) and a hexagonal head 16, which allows the threaded member 14 to be attached to the lid 5 together with the guide tube 13.
It can be screwed into the screw hole 9 of.

Diameters 1 l/2" (38,1 mm) and 2" (5
Sleeve nuts 11 and 18 shown in FIGS. 6 and 7 are prepared to be suitable for threaded holes of 0.8 Tnm).

The sleeve nut 11 of FIG. 6 has an internal thread of 1v4', so that the sleeve nut 11 of FIG. tt
It has a 114" external thread for being screwed into the screw hole 9 of the lid. The sleeve nut 18 in FIG. 7 similarly fits over the 1/4" external thread of the threaded member 14. It has a 11/4" internal thread and a 2" diameter external thread. Furthermore, the two sleeve nuts have hexagonal heads 16 for rotation by a tool.

As is clear from FIG. 4, there is a collar 19 at the upper end of the guide tube 13, to which the terminal box 8 schematically shown in FIGS. 1 and 2 can be fixed. A collision plate 21 is arranged.The collision plate 21 can provide a destruction target zone for sensor integration.The collision plate 21 is held by screws 22.

To determine the fuel level in the storage tank 1, a float system is used, which is shown in detail in FIGS. 8-10. The float system consists of a split sliding bearing 23 and a float arm 24 that can be inserted into each other with the sliding bearing 23 (see also FIG. 5).

Plain bearing 230 The two shells 25 and 26 are hinged 21
Accordingly, it is possible to turn around the guide If13 or an axis running parallel to the vertical axis 28 of the sensor 1. The plain bearing 23 has locking holes 2 in the plain bearing shell 26 on radially opposite sides.
9 and the sliding bearing ring 25 are provided with locking pins 30.

With this formation, the sliding bearing 23 is introduced into the storage tank 1 through the optical hole 10, placed around the guide tube 13 (in the open state), and then the locking pin 30 is inserted to complete the sliding bearing 23. It can be closed by pushing into the locking hole 29. At least one leg-spring 3 in the area of the hinge 27
1 serves to load the locking pin 30 and the locking hole 29 in the closing direction.

The shells 25,26 are made of pressure-resistant plastic filled with rigid foam. Furthermore, an outer magnet system is embedded approximately at the mid-level of the shell 25,26. This outer magnet system, as shown in FIGS. 8 and 9, consists of a total of twelve magnet blocks 32, each arranged in two planes at 60 DEG from each other. Furthermore, the sliding bearing 23 is
One spring 33 is connected to the other, and this spring is electrically coupled to the magnet system 32 (FIG. 8).

In particular, the cylindrical float arm 24 is fixed to the sliding bearing 23 by a simple insertion. For this purpose, the /el 25.26 has five radial holes 34 offset by 120° relative to each other on the circumference in the central height range, which taper conically from the outer circumference towards the inner circumference (no. 8-10
figure).

As is clear from FIG. 9, the hole 34 widens again on the side of the iron backing plate 35, so that the laterally expanding clip 36 fixed to the end face of the float arm 24 forms a form-fitting and elastic fit into the hole 34. 25, 26, thereby allowing the float arm to be fixed in a radially projecting manner in the wells 25,26. The clip 36 is fixed to a plate 37 which is embedded in the float arm 24 at its 4B4 position (FIG. 8).

Furthermore, it is clear from FIG. 8 that in each case two mutually adjacent float arms 24 are connected to each other by a thin hook-shaped bayonet 38. Bayonet 38 can be welded to float arm 24.

Figures 11 to 14 show a sliding bearing 39°4002 that cannot be opened.
Two examples are shown. The base material is formed in each case by short tube sections 41,42. In the case of FIGS. 11 and 12, since the cross section of the magnet block 41 is hexagonal, the magnet blocks 32 arranged on two height planes are not processed and the inner surface 43 is
It can be installed to An insertion hole 34 for inserting a clip 36 of the float arm 24, as indicated by an arrow, is provided between two magnet blocks 320 that are stacked one above the other.

In the case of the embodiments of FIGS. 16 and 14, the magnet blocks 32, which are also arranged at two levels, must have their faces facing the tube piece 42 fastened in order to fit into the inner surface of the U.

Figures 15 and 16 show cross sections of the guide tubes 13a, 13b. In the case of the actual sister example shown in FIG. 15, the irregularly shaped rails 44 are integrally molded on the inner surface of the guide tube 13a.The irregularly shaped rails 44 face each other in the radial direction and have the same longitudinal center plane 45. This rail forms a substantially IF rectangular vertical passage 46, which opens toward the central longitudinal direction of the guide tube 13a.

holes 47&'f, partitioned by clamp fins 48;
The machine Hr= will be explained later with reference to FIG.

In the case of the embodiment shown in FIG. 16, the guide tube 13b is formed in a substantially tube-to-middle arrangement. Comparatively thick-walled Kouki pulled outside W49
An inner pipe 50 is fitted into the inner pipe, and the inner pipe itself is provided with a deformed rail 51 molded into one body, and the deformed rail faces ≠ radially as in the embodiment shown in FIG. has.

Although the irregularly shaped rail 51 also forms the passage 52, the guide tube 1
3b towards the longitudinal axis 28.

The clamp fins 53 of this irregularly shaped rail 51 expand outward at right angles to the vertical center 45.

The irregularly shaped rail 44°51 shown in Figures 15 and 16 is the first
Fig. 7 ((Used for fixing the irregularly shaped bar 54 shown.
The illustrated guide tube 13b corresponds to the embodiment shown in FIG.

The profiled bar 54 is, for example, an extrusion molded product and has a U-shaped cross section, and the clamp fins 53 of the profiled rail 51 are provided with fins such that the profiled bar 54 is fixed to the profiled rail 51 under tightening action. The outside of is surrounded.

The side surface of the irregularly shaped bar 54, which extends parallel to the longitudinal center plane 45 of the guide tube 13b, has continuous guide grooves 56 parallel to each other for the bearing balls 58 that are self-stamped in the substantially double T-shaped contact block 57. . This contact slide 57 has supports 59 on both sides of the profiled bar, into which the inner magnet system, which can be seen in FIG. 9, is embedded. This magnet system also consists of circumferentially offset magnet blocks 60 arranged at two heights.

The two magnet supports 59 are connected to each other by means of a sea urchin 1 extending between the profiled bars 54 and away from them. Sliders 62 to 65 are fixed to this web 61 in a direction perpendicular to the support 59, respectively, and these sliders are connected to a metal resistance path 66 which is pressed against the surface 10 of the deformed par 54 facing its longitudinal direction. ~Slide along 69. Resistance paths 66-69 run the entire length of profiled bar 54. It is shown that the return lines 11 to γ4 are drawn into the irregularly shaped bar 54. Furthermore, FIG. 17 shows that a tap line .gamma.5 for the meter meter tap is arranged between the resistance paths 66.69 or 67.68. This tamp line 75 also has a slider 7 in sliding contact with the tap line at the center of the web 61.
6 is placed.

Finally, FIG. 17 shows a bridge comparison illustrated in FIG. 18 in which sliders 62.64 or 63° 65 of resistance i% 66.68 or 67.69 are radially opposed to each other with respect to the longitudinal axis of the guide tube 13b. Indicates that they are cross-coupled with each other in the form of a circuit.

FIG. 18 shows a resistive glitch circuit capable of detecting levels using four-conductor technology, which includes a slope adjuster NRF for the starting level and a final level for electrical adaptation to the tank slope Iσ. regulator for NHK
Equipped with. S indicates the lead of the measurement system.

The upper end of the resistance path 69 is connected to the l1ji diagonal adjuster NFtK]-
It is clear that the terminal is connected to the N terminal of the connection spatula r8. Similarly, the upper end of the resistance path 68 is coupled to the terminal N via NHK. The upper end of the resistance path 66 is connected to the zero terminal Z, and the lower end of the resistance path 69 is also connected to this via the return line γ4. The upper end of the resistance path 61 is
The ball is connected to another zero terminal Z, to which the lower end of the resistance path 68 is also connected via a return line 73. The lower end of the resistance path 67 is coupled together with the lower end of the resistance path 66 to the connection head 8 ON terminal via return lines 72 and 71 and the starting level slope adjustment 5 NRF. The two regulators, jfl NRK and NRF, are now mechanically coupled to each other. Respective tilt adjuster NHK of connection head 8
Alternatively, the leads provided between NRF' and terminal N are coupled together by a termination impedance RA.

Furthermore, the measuring system has a temperature measurement value transmitter 71, which is connected to the terminal T of the connection head 8.

A groundwater protection transmitter γ8 is attached to the +jllJ fixed thread, and the water that has entered the manhole 6 and (
or) fuel can be secured. Groundwater protection transmitter 18 is connected to connection head 8 via terminal 0.

Finally, FIG. 18 shows that the measuring system connects the sensor identification signal Wi REC connected to the connection head 8 via the terminal E.

[Brief explanation of drawings]

Figure 1 is a vertical view of a storage tank buried underground, Figure 2
The figure is a sectional view taken along the line nu@ in Figure 1, Figure 5 is a plan view of the lid of the dome of the storage tank, and Figure 4 is a side view of the guide/wall that can be introduced into the storage tank shown in Figures 1 to 6. 5 is a side view of the screw member that fixes the guide tube, FIGS. 6 and 7 are side views of the additional member of the screw member shown in FIG. 5, and FIG. 8 is a side view of the screw member that fixes the guide tube. 9 is a side view of the float yarn shown in FIG. 8, FIG. 10 is a perspective view of the slide bearing of the float yarn, FIG. 11 is a plan view of the outer magnet system, and FIG. Figure 16 is a plan view of another embodiment of the outer magnet system, Figure 14 is Figure 16 XIV
-XIV line sectional view, Figure 15 is the figure 4 XV - A sectional view taken along the line X1llll, and FIG. 18 is a circuit diagram of the sensor. 1... Storage tank 2... Fuel 4... Dome
5...Dome lid 6...Manhole 1...Sensor 8...Terminal box 13...Guidance/#
23...Sliding bearing 24...Float arm 25
,26...El 44.51...Irregular rail 5
3... Clamp fin 54... Unusual par 51.
・・Reed 1 Sushi slider 59・Magnet support 60・
...Magnet block 62-65.76...Slider 6
6-69...Resistor 11-74...Return line 15.
...Tap line NRK, NRF...Slope adjuster sub-agent Patent attorney Toshio YanoFIG, 2 1 FIG, 3 FlG, 8

Claims (1)

[Claims] 1. A guide tube of the float and in the guide tube provided with an outer magnetic system that can be inserted into the respective storage tank through a threaded hole provided in the lid of the dome and connected to this lid. It has an electrical resistance path arranged and connected to the display device, which resistance path slides into contact with a contact device arranged against a contact slide that is forcibly guided in the guide tube, so that the contact slide contacts the inner magnet system. In the sensor of a liquid-fillable storage tank, which is carried level-dependently in the longitudinal direction of the guide tube by an external magnet system arranged on the float via the electrical resistance path (66-69) extends over the entire measuring path. The longitudinal center of the guide tube (13, 13a + 13b), which forms a single component with the conductive profile bar (54) and which is radially opposed inside the guide tube (13, 13a, 13b). Two irregularly shaped rails (4) arranged parallel to the surface (45)
4, 51) under tightening stress, and the deformed bar (54
) at the same time form a forced guide (56) of the contact slide (57), which is connected to each other by a web (61) between profiled bars (54). and a resistance path (
floats (23, 24) formed to be insertable via the inner magnet system (60) and the outer magnet system (32); A sensor for a storage tank capable of being filled with a liquid, characterized in that the sensor is coupled in an entrainable manner. 2. The sensor according to claim 1, wherein the irregularly shaped rail (44) is formed as a single component with the guide tube (13a). 6. The sensor according to claim 1, wherein the irregularly shaped rail (51) is a component of an inner tube (50) inserted into an outer tube (49). 4. Claim 1, in which the irregularly shaped rails (44, 51) are formed in the shape of passages (46, 52) with a substantially square cross section.
The sensor according to one of items 6 to 6. 5 Clamp fins (48, 5) with irregularly shaped rails (44, 51) facing inward or outward at right angles to the vertical center plane (45)
3). Sensor according to one of claims 1 to 4. 6 Profile bar (54) is extruded it, side surface (55)
2. The sensor according to claim 1, further comprising a guide R (56) for the contact slide (57). 7. The resistance paths (66 to 69) are formed by metal strips, each of which is pressed into contact with the mutually facing surfaces (70) of the irregularly shaped bar (54) so that the surfaces thereof face each other. In the described sensor 8, each profiled bar (54) has two laterally spaced resistance paths (66, 69 or 67, 68) parallel to each other;
8. Sensor according to claim 1, in which a low-resistance tap line (75) in the form of a metal strip IJ tube is pressed into contact therebetween. 9. The resistance path (66-69) is adjusted so as to have an electrically compatible functional relationship according to the tank volume-filling curve over the measuring stroke. The sensor described in one. 10 The return a (71-74) of the resistance path (66-69) is drawn into the irregularly shaped bar (54) and it stays! A sensor according to claim 1 and one of claims 7 to 9. 11, ') Web of concubine slider (57) (61)
According to claim 1, four contact devices cross-coupled with each other in a bridge comparison circuit are fixed in the form of sliders (62-65) cooperating with four resistance paths (66-69). The sensor described in item 1. 12. Sliding bearings in which the float consists of two shells containing an outer magnet system (23) and nonyl sliding bearings (25, 26
2. The sensor according to claim 1, wherein the sensor is formed of a float body (24) which can be inserted into one another. 13 The shells (25, 26) of the plain bearings are hinged on one side and connected to each other with locking devices (29, 26) on the other side.
30) Claim 1
The sensor described in item 2. 14 At least one leg spring on the hinge (2γ)
17. The sensor according to claim 16, wherein the force is located at the position of the sensor. 15 Waste 1iQI + receiver (23) is the guide tube (13,1
3a. 13b). Sensor according to one of claims 12 to 14, comprising an electrical contact spring (33) in contact with 13b). 16, the outer magnet system consisting of a large number of individual magnet blocks (32) is made of a metal circular tube piece (42)-f or a polygonal tube piece (42).
1) A senna according to claim 1, wherein a float body (24)' made of pressure-resistant plastic filled with a hard foam can be inserted into a locking hole (34) on the circumferential surface of the senna. 17 The guide tube (13, 13a, 13b) has a threaded member giving up a 1 inch external thread for fixing it to the dome lid (5), and a large inch external thread (1 inch, 7 inch) is attached to this member.
17. The sensor according to claim 1, wherein the sensor can be fitted with a sleeve nut (17, 18) having a sleeve nut (17, 18) having a diameter of 100 mm or more. 18. Manually or automatically respond to tank tilt position."
Electrical correction device for two-part and bottom resistance (66~h
18. Sensor according to one of the claims 1 to 17, characterized in that a connecting head (13, 13a, 13b) is arranged in the guide tube (13, 13a, 13b). 19. Sensor according to claim 18, wherein the correction device forms at least in part a component of an explosion-proof terminal box (8) with the conductor plate. 20. Sensor according to claim 18, characterized in that the connecting head (8) is provided with a display and operating unit. 21. Sensor according to claim 20, in which a microprocessor with a suitable memory area is arranged in the display and operating unit. 22. The sensor according to one of claims 1 to 21, wherein a temperature measurement i direct transmitter (77) is arranged on the guide/meter (13, 13a, 13b). 23. Senna according to one of claims 1 to 21, in which at least one limit value transmitter is arranged in the guide # (13, 13a, 13b). 24 Claims 1 to 24 in which a groundwater protection transmitter (78) is disposed in the guide pipe (13, 13a, 13b)
Sensor according to one of clauses 21. 25. Sensor according to one of claims 1 to 21, comprising a sensor identification transmitter (REC).