CN109579922A - A kind of plug-in type differential pressure flowmeter and flow-measuring method - Google Patents
A kind of plug-in type differential pressure flowmeter and flow-measuring method Download PDFInfo
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- CN109579922A CN109579922A CN201910104237.7A CN201910104237A CN109579922A CN 109579922 A CN109579922 A CN 109579922A CN 201910104237 A CN201910104237 A CN 201910104237A CN 109579922 A CN109579922 A CN 109579922A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F1/00—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow
- G01F1/05—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects
- G01F1/34—Measuring the volume flow or mass flow of fluid or fluent solid material wherein the fluid passes through a meter in a continuous flow by using mechanical effects by measuring pressure or differential pressure
- G01F1/50—Correcting or compensating means
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Abstract
This application discloses a kind of plug-in type differential pressure flowmeter and flow-measuring methods, including sequentially connected pressure obtaning device, pressure guiding device, differential pressure transmitter and Flow Meter Based.Since the on state of its pressure guiding device is controlled by the temperature of pressure guiding device and the size relation of detected fluid temperature, to guarantee flowmeter when measuring, temperature of the detected fluid temperature no more than pilot channel in pressure guiding device, so that fluid to be measured generates the phenomenon that condensation or solidification in the pressure guiding device of plug-in type differential pressure flowmeter and is avoided, and then reduce the measuring error and error of differential pressure flowmeter.
Description
Technical field
The invention belongs to flow measurement technology fields, and in particular to a kind of plug-in type differential pressure flowmeter.
Background technique
Differential pressure flowmeter is according to differential pressure, known fluid condition and the inspection for being installed on flow detection part generation in pipeline
The geometric dimension of survey part and pipeline carrys out the instrument of measuring flow.Differential pressure flowmeter is by primary device (detection piece) and secondary device
(differential pressure conversion and flow displaying instrument) composition.Usually classified with the pattern of detection piece to differential pressure flowmeter, such as orifice flow
Meter, differential pressure type flowmeter and mean velocity tube flowmeter etc..Secondary installing be various machinery, electronics, electromechanical difference gauge, it is poor
Pressure transmitter and flow indication and calculating instrument, it is very high that it has developed into three changes (seriation, generalization and standardization) degree
The numerous and jumbled major class instrument of type specification.Difference gauge can be used to measuring flow parameter, also can measure other parameters (such as pressure,
Level, density etc.).Wherein, mean velocity tube flowmeter includes Annbar, Torbar, Probar, verabar, itabar etc., is base
In Pitot tube measuring principle, i.e., typical differential flow sensor is slotting come the one kind for calculating flow with side ducts midpoint flow velocity
Enter formula flow instrument.The citation form of mean velocity tube flowmeter application all develops on section for certain flowing is abundant in direction of flow,
Radially (or designated position and direction) is inserted into an inspection pressure guiding pipe.Stagnation pressure chamber and two, static pressure chamber are divided into inside inspection pressure guiding pipe
Independent cavity, meeting cavity on front side of stream direction is stagnation pressure chamber, and rear side is static pressure chamber.Inspection pressure guiding pipe meets stream direction and cuts ratio according to logarithm
Husband's integration method is avenged, position is selected to take pitot hole at split, it is identical as stagnation pressure chamber.
When plug-in type differential pressure flowmeter is installed and used, pressure guiding device can be placed in pipeline external, if ambient temperature
When lower than the temperature of detected fluid, it will appear condensation or solidification phenomenon in the fluid channel in pressure guiding device, make in pressure guiding device
Detected fluid medium can not normal pilot, and then cause differential pressure flowmeter generate measuring error close error.
Summary of the invention
The present invention solves the technical problem of working as, external testing environment temperature is lower than the temperature of fluid to be measured in pipeline
When, fluid to be measured generates the phenomenon that condensing or solidifying easily in the pressure guiding device of plug-in type differential pressure flowmeter, and then causes differential pressure
Formula flowmeter generates the technical issues of measuring error or error.
According in a first aspect, providing a kind of plug-in type differential pressure flowmeter, including sequentially connected pressure in a kind of embodiment
Device, pressure guiding device and differential pressure transmitter；
The pressure obtaning device, is provided with pressure port；The pressure port be used for full of detected fluid pipeline in obtain with
The relevant high pressure of the flow velocity of detected fluid and low pressure；
The pressure guiding device is used for the high pressure and low-voltage transmission to the differential pressure transmitter；The pressure guiding device is led
Logical state is controlled by the temperature of the pressure guiding device and the size relation of detected fluid temperature；
The differential pressure transmitter for obtaining differential pressure signal according to the high pressure and low pressure, and the differential pressure signal is become
At electric signal.
According to second aspect, a kind of flow-measuring method of plug-in type differential pressure flowmeter is provided in a kind of embodiment, comprising:
Monitor the temperature of flowmeter pressure transmitting device and the temperature of detected fluid；
The temperature of the pressure guiding device is compared with the temperature of detected fluid, obtains comparison result；
The working condition of the flowmeter is controlled according to the comparison result.
According to the plug-in type differential pressure flowmeter and flow-measuring method of above-described embodiment, due to the pressure guiding device of flowmeter
On state is controlled by the temperature of pressure guiding device and the size relation of detected fluid temperature, to guarantee that flowmeter is measuring
When, detected fluid temperature is not more than the temperature in pilot channel in pressure guiding device, so that fluid to be measured is in plug-in type differential pressure flowmeter
Pressure guiding device in generate condensation or solidification the phenomenon that be avoided, and then reduce differential pressure flowmeter measuring error and mistake
Difference.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of plug-in type differential pressure flowmeter in embodiment；
Fig. 2 is a kind of connection schematic diagram of plug-in type differential pressure flowmeter in embodiment；
Fig. 3 is a kind of structural schematic diagram of the pressure obtaning device of plug-in type differential pressure flowmeter in embodiment；
Fig. 4 is the schematic cross-section of the pressure guiding pipe of plug-in type differential pressure flowmeter in an embodiment；
Fig. 5 is the pressure part structural schematic diagram of plug-in type differential pressure flowmeter in an embodiment；
Fig. 6 is the structural schematic diagram of plug-in type differential pressure flowmeter in an embodiment；
Fig. 7 is the pilot part structural schematic diagram of plug-in type differential pressure flowmeter in an embodiment；
Fig. 8 is the flow-measuring method flow chart of plug-in type differential pressure flowmeter in another embodiment.
Specific embodiment
Below by specific embodiment combination attached drawing, invention is further described in detail.Wherein different embodiments
Middle similar component uses associated similar element numbers.In the following embodiments, many datail descriptions be in order to
The application is better understood.However, those skilled in the art can recognize without lifting an eyebrow, part of feature
It is dispensed, or can be substituted by other elements, material, method in varied situations.In some cases, this Shen
Please it is relevant it is some operation there is no in the description show or describe, this is the core in order to avoid the application by mistake
More descriptions are flooded, and to those skilled in the art, these relevant operations, which are described in detail, not to be necessary, they
Relevant operation can be completely understood according to the general technology knowledge of description and this field in specification.
It is formed respectively in addition, feature described in this description, operation or feature can combine in any suitable way
Kind embodiment.Meanwhile each step in method description or movement can also can be aobvious and easy according to those skilled in the art institute
The mode carry out sequence exchange or adjustment seen.Therefore, the various sequences in the description and the appended drawings are intended merely to clearly describe a certain
A embodiment is not meant to be necessary sequence, and wherein some sequentially must comply with unless otherwise indicated.
It is herein component institute serialization number itself, such as " first ", " second " etc., is only used for distinguishing described object,
Without any sequence or art-recognized meanings.And " connection ", " connection " described in the application, unless otherwise instructed, include directly and
It is indirectly connected with (connection).
In embodiments of the present invention, plug-in type differential pressure flowmeter includes sequentially connected pressure obtaning device, pressure guiding device and difference
Pressure transmitter, wherein the on state of pressure guiding device is controlled by the temperature of pressure guiding device and the size relation of detected fluid temperature,
To guarantee flowmeter when measuring, detected fluid temperature is not more than the temperature in pilot channel in pressure guiding device, so as to be measured
Fluid generates condensation in the pressure guiding device of plug-in type differential pressure flowmeter or is avoided the phenomenon that solidification, and then reduces differential pressure type
The measuring error and error of flowmeter.
Embodiment one:
As shown in Figure 1, for a kind of structural schematic diagram of plug-in type differential pressure flowmeter in embodiment, including sequentially connected take
Pressure device 40, pressure guiding device 30, differential pressure transmitter 20 and Flow Meter Based 10.It is provided with pressure port on pressure obtaning device 40, is used for
High pressure relevant to the flow velocity of detected fluid and low pressure are obtained in the pipeline full of detected fluid.Pressure guiding device 30 is used for will be high
Pressure and low-voltage transmission to differential pressure transmitter 20, the on state of pressure guiding device 30 by pressure guiding device temperature and detected fluid temperature
Size relation control.Differential pressure transmitter 20 is used to obtain differential pressure signal according to high pressure and low pressure, and the differential pressure signal is become
Electric signal is sent to Flow Meter Based 10.Flow Meter Based 10 is used for the electric signal and other devices for generating differential pressure transmitter 20
The thermal compensation signal of generation carries out evolution and integrating, display moment flow, integrated flow and other flows.Wherein, pressure guiding device 30
Including pilot part 31, temperature sensor 32, controller 33 and heater 34.Pilot part 31 is connected to pressure obtaning device 40 and differential pressure becomes
It send between device 20, the high pressure and low-voltage transmission for obtaining pressure obtaning device 40 are to differential pressure transmitter 20.The setting of controller 33 exists
On pilot part 31, for controlling the on state of pilot part 31.Temperature sensor 32 is used to measure the temperature of pilot part 31.Heating
Device 34 is arranged on pilot part 31, for heating up to pilot part 31.
As shown in Fig. 2, for a kind of connection schematic diagram of plug-in type differential pressure flowmeter in embodiment, including Flow Meter Based
10, differential pressure transmitter 20, pressure guiding device and pressure obtaning device.Pressure guiding device includes pilot part 31, controller 33, temperature sensor 32
With heating device 34.It is provided with pilot part high-pressure channel and pilot part low-pressure channel in pilot part 31, is used for pressure obtaning device 41
The high pressure and low-voltage transmission of acquisition are to differential pressure transmitter 20.Controller 33 includes two shut-off valves, is separately positioned on pilot part 31
On interior pilot part high-pressure channel and pilot part low-pressure channel, for controlling pilot part high-pressure channel and pilot part low-pressure channel
On state.Controller 33 includes that two shut-off valves are separately positioned on two pressure channels in pressure guiding device, is led with control
The switch state of pressure device.The fitting setting of temperature sensor 32 is connect on pilot part 31, and with controller 33, is led for measuring
The temperature of casting die 31, and measurement result is sent to controller 33.In one embodiment, temperature sensor 32 is arranged in pilot part 31
In interior pressure transmission channel, control is sent to for measuring the temperature of pressure transmission channel in pilot part 31, and by measurement result
Device 33.Heating device 34 is for heating pilot part 31.In one embodiment, heating device 34 is heating sheet, fitting setting
On pilot part 31.Heating sheet can be resistance heating, induction heating, electric arc heated, electron beam heating, infrared heating and Jie
One of matter heating.It wherein, is mainly the Joule effect generated by electric current using the electric boiling plate of resistance heating, electric energy
Thermal energy is converted to, the purpose of heating is had reached, specifically includes direct resistance heating and indirect resistance heating.Induction heating is mainly sharp
It is exactly that problem can generate induced current in the electromagnetic field of alternation, that is, be vortexed, has generated fuel factor to promote conductor
Generate heat.The electric boiling plate of electric arc heated is that electric arc is utilized to can produce the effect of high temperature to heat the object for needing to heat
Body, specifically to include directly heating and indirect heating.In one embodiment, heating device 34 includes ceramic heating flake.Pressure obtaning device
Including pressure part 41 and pressure guiding pipe 42.
Plug-in type differential pressure flowmeter disclosed in the present application, pressure obtaning device 41 by lower connecting flange 43 with it is upper on pipeline
Acting flange 44 is fixedly connected, and pressure part 41 is insinuated into pipeline.Detected fluid enters pressure obtaning device, flow velocity through rectilinear duct
It will be shunk at pressure obtaning device, and accelerate flow velocity, static pressure reduces, and causes to generate differential pressure before and after pressure obtaning device.Flow velocity increases, poor
Pressure also increases with it, and therefore, by measuring differential pressure, can determine flow.In specific measurement process, two of controller 33 are cut
Only valve original state is in off state, and then closes the pilot part high-pressure channel and pilot part low-pressure channel in pilot part 31, is made
Plug-in type differential pressure flowmeter is in halted state.Temperature sensor 32 measures the temperature of pilot part 31, and by the temperature of pilot part 31
Degree is sent to controller 33.The temperature of pilot part 31 is compared by controller 33 with the temperature of detected fluid, is compared with obtaining
As a result.Switch state of the controller 33 according to comparison result control shut-off valve, and then it is high to control the pilot part in pilot part 31
The switch state of pressure passageway and pilot part low-pressure channel, has realized the control to plug-in type differential pressure flowmeter working condition.
Working condition according to comparison result control plug-in type differential pressure flowmeter specifically includes:
When the temperature that comparison result is pilot part 31 is less than the temperature of detected fluid, controller 33 opens heating device
34.Heating device 34 heats up to the pilot part 31 of flowmeter after opening；When comparison result be pilot part 31 temperature it is not small
When the temperature of detected fluid, controller 33 opens shut-off valve, and then opens the pilot part high-pressure channel in pilot part 31 and lead
Casting die low-pressure channel makes plug-in type differential pressure flowmeter be in measuring state.In one embodiment, setting comparison result is pilot part 31
Temperature be greater than detected fluid temperature value be 5 degrees Celsius when, controller 33 open shut-off valve, and then open pilot part 31 in
Pilot part high-pressure channel and pilot part low-pressure channel, make plug-in type differential pressure flowmeter be in measuring state.
In one embodiment, the setting of the part in detected fluid pipeline temperature is probeed into plug-in type differential pressure flowmeter pressure obtaning device 40
Sensor is spent, to measure the temperature of detected fluid, and measurement result is sent to controller.
As shown in figure 3, for a kind of pressure obtaning device structural schematic diagram of plug-in type differential pressure flowmeter in embodiment, including transition
Part 421, pressure guiding pipe 422 and pressure part 41.Pressure guiding pipe 422 is connected between transition piece 421 and pressure part 41.Pressure guiding pipe 422 is used
In the detected fluid for bearing pressure part 41 pressure transmission to transition piece 421.The inner cavity of pressure guiding pipe 422 is provided with high-voltage tube
423.Transition piece high-pressure channel and transition piece low-pressure channel are provided in transition piece 421, it is high respectively at the pilot part in pilot part
Pressure passageway is connected to pilot part low-pressure channel.Pressure hole 411 and low pressure hole 412 are provided on pressure part 41.Pressure hole 411 passes through
High-voltage tube 423 is connected to the transition piece high-pressure channel in transition piece 421.Inner cavity and transition of the low pressure hole 412 by pressure guiding pipe 422
Transition piece low-pressure channel connection in part 421.In one embodiment, it is provided with sealing ring between pressure guiding pipe 422 and transition piece 421,
It is provided with sealing ring between pressure guiding pipe 422 and pressure part 41, for sealing.High-voltage tube 423 passes through screw thread and pressure part 41 respectively
It is connected with transition piece 421, and is respectively arranged with sealing ring.In one embodiment, pressure guiding pipe 422 and transition piece 421 and pressure part 41
Between connection sealed by laser welding mode.In one embodiment, transition piece 421, pressure guiding pipe 422 and pressure part 41 are metals,
When heater heats up to pilot part, transmitted by intermetallic heat, transferring high voltage in transition piece 421 and pressure guiding pipe 422
It also heats up simultaneously with the channel of low pressure.
As shown in figure 4, drawing in one embodiment for the pressure guiding pipe schematic cross-section of plug-in type differential pressure flowmeter in an embodiment
Pressure pipe 422 and high-voltage tube 423 are all round tube, i.e., its section is annular.
As shown in figure 5, pressure part 41 is arranged for the pressure part structural schematic diagram of plug-in type differential pressure flowmeter in an embodiment
There are two the low pressure holes 411 be connected.The low pressure hole 411 of two conductings is respectively arranged at the two sides of pressure hole 412.Pressure part 41
Cross section is bullet-headed, and is integrated double cavity structure.Pressure hole 412 is upstream pressure tappings, and low pressure hole 411 is the pressure that flows down
Mouthful.Upper pressure tappings draw the normal pressure of detected fluid, i.e. high pressure.Downstream pressure tappings draw the negative pressure of fluid, i.e. low pressure.
As shown in fig. 6, for the structural schematic diagram of plug-in type differential pressure flowmeter in an embodiment, including differential pressure transmitter 20,
Pilot part 31, transition piece 421, pressure guiding pipe 422, lower connecting flange 43 and pressure part 41.Low pressure hole 411 is provided on pressure part 41
With pressure hole 412.Plug-in type differential pressure flowmeter is fixedly connected on the pipeline of detected fluid by lower connecting flange 43, and will be taken
Casting die 41 is insinuated into pipeline.The high pressure and low pressure that low pressure hole 411 and pressure hole 412 obtain are by pressure guiding pipe 422, through transition piece
421 transition piece high-pressure channel and the low-pressure channel of transition piece, through the pilot part high-pressure channel and pilot part in pilot part 31
Low-pressure channel is transferred to differential pressure transmitter 20.It is provided with Flow Meter Based interface 101 on differential pressure transmitter 20, is used for and flowmeter
Instrument 10 is calculated to be electrically connected.It is provided with the first shut-off valve 331 and the second shut-off valve 332 on pilot part 31, it is high to be separately positioned on pilot part
On pressure passageway and pilot part low-pressure channel, and it is connect with controller, it is logical for controlling pilot part high-pressure channel and pilot part low pressure
Road conducting and closing, to realize the control to the working condition of plug-in type differential pressure flowmeter.
As shown in fig. 7, for the pilot part structural schematic diagram of plug-in type differential pressure flowmeter in an embodiment, including differential pressure transporting
Device 20 and pilot part 31.Differential pressure transmitter 20 is arranged on pilot part 31.First shut-off valve 331 of controller and the second shut-off valve
332 are arranged on pilot part 31.Flow Meter Based interface 101 is provided on differential pressure transmitter 20.
Plug-in type differential pressure flowmeter disclosed in the present embodiment, the on state of pressure guiding device by pressure guiding device temperature with
The size relation of detected fluid temperature controls, and to guarantee flowmeter when measuring, detected fluid temperature is filled no more than pilot
Set the temperature in interior pilot channel so that fluid to be measured generated in the pressure guiding device of plug-in type differential pressure flowmeter condensation or solidification
Phenomenon is avoided, and then reduces the measuring error and error of differential pressure flowmeter.
Embodiment two:
As shown in figure 8, for the flow-measuring method flow chart of plug-in type differential pressure flowmeter in another embodiment.The application is also
Disclose a kind of flow-measuring method of plug-in type differential pressure flowmeter, comprising:
Step 1, the temperature of flowmeter pressure transmitting device and the temperature of detected fluid are monitored；
The temperature of the temperature sensor measurement pressure guiding device of flowmeter, and measurement result is sent to controller.Flowmeter
Temperature sensor also measure the temperature of detected fluid, and measurement result is sent to controller.
Step 2, the temperature of pressure guiding device is compared with the temperature of detected fluid, obtains comparison result；
The temperature for the pressure guiding device that temperature sensor obtains is compared by controller with the temperature of detected fluid, to obtain
Comparison result.
Step 3, the working condition according to comparison result control flowmeter.
Controller is specifically included according to the working condition of comparison result control plug-in type differential pressure flowmeter:
When the temperature that comparison result is pressure guiding device is less than the temperature of detected fluid, controller opens heating device.Add
Thermal heats up to the pressure guiding device of flowmeter after opening；When comparison result is the temperature of pressure guiding device not less than measured stream
When the temperature of body, controller opens shut-off valve, and then opens the pilot part high-pressure channel in pressure guiding device and pilot part low pressure is logical
Road makes plug-in type differential pressure flowmeter be in measuring state.In one embodiment, setting comparison result is that the temperature of pressure guiding device is greater than
When the temperature value of detected fluid is 5 degrees Celsius, controller opens shut-off valve, and then opens the pilot part high pressure in pressure guiding device 1
Channel and pilot part low-pressure channel, make plug-in type differential pressure flowmeter be in measuring state.
Use above specific case is illustrated the present invention, is merely used to help understand the present invention, not to limit
The system present invention.For those skilled in the art, according to the thought of the present invention, can also make several simple
It deduces, deform or replaces.
Claims (10)
1. a kind of plug-in type differential pressure flowmeter, which is characterized in that become including sequentially connected pressure obtaning device, pressure guiding device and differential pressure
Send device；
The pressure obtaning device, is provided with pressure port；The pressure port is used to obtain and be tested in the pipeline full of detected fluid
The relevant high pressure of the flow velocity of fluid and low pressure；
The pressure guiding device is used for the high pressure and low-voltage transmission to the differential pressure transmitter；The conducting shape of the pressure guiding device
State is controlled by the temperature of the pressure guiding device and the size relation of detected fluid temperature；
The differential pressure signal for obtaining differential pressure signal according to the high pressure and low pressure, and is become electricity by the differential pressure transmitter
Signal.
2. flowmeter as described in claim 1, which is characterized in that the pressure guiding device includes pilot part, temperature sensor, control
Device and heater processed；
The pilot part is connected between the pressure obtaning device and the differential pressure transmitter, is used for the high pressure and low-voltage transmission
To the differential pressure transmitter；
The controller is arranged on the pilot part, for controlling the on state of the pilot part；
The temperature sensor, for measuring the temperature of the pilot part；
The heater, for heating up to the pilot part.
3. flowmeter as claimed in claim 2, which is characterized in that the pressure obtaning device includes transition piece, pressure guiding pipe and pressure
Part；
It is provided with pressure hole and low pressure hole on the pressure part, for obtaining the high pressure and low pressure；
The pressure guiding pipe is connected between the transition piece and the pressure part；The pressure guiding pipe is used for the high pressure and low pressure
It is transferred to transition piece；The inner cavity of the pressure guiding pipe is provided with high-voltage tube；
It is provided with transition piece high-pressure channel and transition piece low-pressure channel in the transition piece, is used for the high pressure and low-voltage transmission
To the pilot part；
The pressure hole is connected to by the high-voltage tube with the transition piece high-pressure channel；
The low pressure hole is connected to by the inner cavity of the pressure guiding pipe with the transition piece low-pressure channel.
4. flowmeter as claimed in claim 3, which is characterized in that there are two the low pressure holes be connected for the pressure part setting；Institute
The low pressure hole for stating two conductings is respectively arranged at the two sides of the pressure hole.
5. flowmeter as claimed in claim 2, which is characterized in that be provided with pilot part high-pressure channel in the pilot part and lead
Casting die low-pressure channel, for giving the high pressure and low-voltage transmission to the differential pressure transmitter；
The controller includes two shut-off valves, is separately positioned on the pilot part high-pressure channel and the pilot part low-pressure channel
On, for controlling the on state of the pilot part high-pressure channel and the pilot part low-pressure channel.
6. flowmeter as claimed in claim 2, which is characterized in that the heater includes heating sheet, and fitting is arranged described
On pilot part.
7. a kind of flow-measuring method of plug-in type differential pressure flowmeter characterized by comprising
Monitor the temperature of flowmeter pressure transmitting device and the temperature of detected fluid；
The temperature of the pressure guiding device is compared with the temperature of detected fluid, obtains comparison result；
The working condition of the flowmeter is controlled according to the comparison result.
8. the method for claim 7, which is characterized in that control the work shape of the flowmeter according to the comparison result
State, comprising:
When the temperature that the comparison result is pressure guiding device is less than the temperature of detected fluid, to the pressure guiding device of the flowmeter
It heats up.
9. the method for claim 7, which is characterized in that control the work shape of the flowmeter according to the comparison result
State, comprising:
When the temperature that the comparison result is pressure guiding device is not less than the temperature of detected fluid, the flowmeter starts to measure quilt
The flow of fluid measured.
10. the method for claim 7, which is characterized in that control the work of the flowmeter according to the comparison result
State, comprising:
When it is 5 degrees Celsius that the temperature that the comparison result is pressure guiding device, which is greater than the temperature value of detected fluid, the flowmeter
Start the flow of measurement detected fluid.
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| CN201910104237.7A CN109579922A (en) | 2019-02-01 | 2019-02-01 | A kind of plug-in type differential pressure flowmeter and flow-measuring method |
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| CN201910104237.7A CN109579922A (en) | 2019-02-01 | 2019-02-01 | A kind of plug-in type differential pressure flowmeter and flow-measuring method |
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