CN110907021A - Device for verifying float-type liquid level meter - Google Patents
Device for verifying float-type liquid level meter Download PDFInfo
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- CN110907021A CN110907021A CN201911400687.7A CN201911400687A CN110907021A CN 110907021 A CN110907021 A CN 110907021A CN 201911400687 A CN201911400687 A CN 201911400687A CN 110907021 A CN110907021 A CN 110907021A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01F—MEASURING VOLUME, VOLUME FLOW, MASS FLOW OR LIQUID LEVEL; METERING BY VOLUME
- G01F25/00—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume
- G01F25/20—Testing or calibration of apparatus for measuring volume, volume flow or liquid level or for metering by volume of apparatus for measuring liquid level
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Abstract
The invention belongs to the technical field of liquid level meter calibration, and particularly relates to a device for calibrating a float type liquid level meter. The device comprises a specific measuring container, a small water pump, an adjusting valve A, an adjusting valve B, a valve position sensor A, a valve position sensor B, a standard liquid level sensor, a computer and a controller; governing valve A, governing valve B installs respectively at specific measuring vessel's input-output mouth, at the small-size water pump of governing valve A front end installation, governing valve A, connect valve position sensor A on the governing valve B respectively, valve position sensor B, installation standard level sensor below specific measuring vessel, specific measuring vessel upper end installation is by the check-up buoy formula level gauge, valve position sensor A, valve position sensor B, standard level sensor, all connect the computer by the check-up buoy formula level gauge, computer connection director, governing valve A is connected to the controller, governing valve B is connected. The invention realizes the quick and accurate calibration of the float-type liquid level meter.
Description
Technical Field
The invention belongs to the technical field of liquid level meter calibration, and particularly relates to a device for calibrating a float type liquid level meter.
Background
Common liquid level meters of liquid level meters in nuclear power plants include differential pressure type liquid level meters, float type liquid level meters, broadcast guiding radar liquid level meters and the like. Wherein the built-in reloading water tank of nuclear island and widely used in the pit level gauge are buoy type level gauge, and this level gauge is according to Archimedes' principle: an object immersed in a liquid is subjected to a buoyancy equal to the weight of the liquid it displaces. The buoyancy force of the float bowl is reduced by the spring on the upper part (the buoyancy force can be regarded as the effective reduction of the weight of the float bowl original part), the spring is contracted, the iron core in the pressure pipe supports the spring, when the spring is contracted or extended, the iron core moves upwards or downwards, wherein the output of the LVDT (linear differential transformer) changes proportionally, and the difference signal of the voltages of the two secondary coils of the LVDT is fed back to an electronic element controlled by a microprocessor and converted into a 4-20mA output signal, thereby being converted into the water level of the water tank at the moment.
The liquid level meter is installed in a nuclear island, belongs to a radiation control area, and can not be verified in a pressurizing mode due to the particularity that the liquid level meter can not be verified, so that the instrument needs to be checked in a site-away mode, the general range of the instrument is narrow (the maximum range is not more than 1 meter), the required precision is high, the traditional checking method is to perform checking by adopting a method of manually injecting and draining water and manually measuring the height of the water level, and the method is long in time consumption, low in efficiency and poor in accuracy. In view of this, the invention designs a special checking device, which is specially used for checking the float type liquid level meter.
Disclosure of Invention
The invention aims to provide a device for verifying a float-type liquid level meter, which realizes quick and accurate verification of the float-type liquid level meter.
In order to achieve the purpose, the technical scheme adopted by the invention is as follows:
a device for verifying a float-type liquid level meter comprises a specific measuring container, a small-sized water pump, an adjusting valve A, an adjusting valve B, a valve position sensor A, a valve position sensor B, a standard liquid level sensor, a computer and a controller; governing valve A, governing valve B installs respectively at specific measuring vessel's input-output mouth, at the small-size water pump of governing valve A front end installation, governing valve A, connect valve position sensor A on the governing valve B respectively, valve position sensor B, installation standard level sensor below specific measuring vessel, specific measuring vessel upper end installation is by the check-up buoy formula level gauge, valve position sensor A, valve position sensor B, standard level sensor, all connect the computer by the check-up buoy formula level gauge, computer connection director, governing valve A is connected to the controller, governing valve B is connected.
The computer collects the current information of the standard liquid level sensor, the current information of the checked float-type liquid level meter and the information of the valve opening degree of the valve position sensor A and the valve position sensor B, and displays the information on a computer page and calculates PID; the controller receives a command from the computer, compiles and analyzes the command, and controls the regulating valve A and the regulating valve B to realize the rising and falling of the water level of a specific measuring container and realize the requirements of different water levels of the platform of the verifying device; and the computer judges the verified float type liquid level meter according to the current information of the standard liquid level sensor and the current information of the verified float type liquid level meter to obtain a verification result.
The method comprises the steps that a float type liquid level meter to be verified is fixedly installed on a specific measuring container, the measuring range and the precision requirement of the float type liquid level meter are input into a computer through manual operation according to the measuring range of the float type liquid level meter, and the computer calculates the maximum value and the minimum value allowed by the current output by the meter to be verified at a verified point and the water level value of a five-point to be verified according to the precision requirement;
and (3) starting verification: supplying power to the whole checking device, opening the small water pump, manually operating on a computer to click to start checking, transmitting instruction information to a controller by the computer, determining an adjusting valve A to be operated by the controller according to the instruction information, and starting water inflow of a specific measuring container; when the liquid level of the standard liquid level sensor reaches five check point level values one by one, the computer acquires information transmitted by the standard liquid level sensor, and when the liquid level reaches each check point level value, the regulating valve A is closed in time through the controller, and the state of the valve is judged according to the valve position sensor A, so that the level value of a specific measuring container is kept;
meanwhile, the computer collects the current value of the float-type liquid level meter to be checked at the moment, judges and processes according to the operation value of the precision value, judges whether the current value meets the precision requirement, records the judgment result, and displays the current value on the computer; when the computer finishes the data processing and recording of the last check point, the computer continuously sends an instruction to the controller to check the water level of the next check point, and data processing and recording are carried out one by one;
when the liquid level of a specific measuring container reaches the highest point of the measuring range, the computer processes, judges and records the current information of the highest point, sends an instruction to the controller to lower the water level, and starts to check the lower stroke: at the moment, the controller opens the regulating valve B, keeps the regulating valve A closed, starts to descend the liquid level value, and when the liquid level value of the specific measuring container reaches the check point liquid level value of the lower stroke, the controller closes the regulating valve B in time, judges the state of the valve according to the valve position sensor B, and keeps the liquid level value of the specific measuring container;
the checking device sequentially checks and records five check points of the up-down stroke according to the method, when ten check values of the up-down stroke are obtained, the computer further judges, processes and records the ten check values, displays the processing result, and directly outputs a check record list if all the check values meet the requirements; if the numerical value does not meet the precision requirement, the float type liquid level meter is displayed to be unqualified, and the float type liquid level meter needs to be adjusted;
adjusting a float type liquid level meter: the computer is operated manually, the computer sends an instruction to the controller, the controller adjusts the liquid level value of the specific measuring container to the middle value of the measuring range by adjusting the adjusting valve A and the adjusting valve B, the LVDT of the float type liquid level meter is adjusted at the moment to enable the current output value of the float type liquid level meter to be 12mA, the check is carried out again according to the check process after the adjustment is finished, and the check record is output and the check is finished until the computer judges that the check data meet the precision requirement.
The beneficial effects obtained by the invention are as follows:
the float type liquid level meter is a common liquid level measuring instrument of a nuclear power station, and the verification device provides a novel verification method and a novel verification device aiming at the float type liquid level meter, so that the verification of the float type liquid level meter can be completed more quickly and accurately.
1) The calibration device can digitize and integrate the whole calibration process, realizes the calibration of the float-type liquid level meter through digitized operation control, has no measurement and visual error in the original calibration method in the whole process, and improves the accuracy of the calibration process.
2) The whole checking device is integrated, the checking process is realized only by connecting and fixing the checked float type liquid level meter, a stable and reliable checking platform is provided, and compared with the original checking method, the working time is saved, and the working efficiency is improved.
Drawings
Fig. 1 is a diagram showing the configuration of an apparatus for verifying a float type level gauge.
Detailed Description
The invention is described in detail below with reference to the figures and specific embodiments.
Referring to fig. 1, the apparatus for float level gauge verification according to the present invention comprises a specific measuring container 1, a small water pump 2, a regulating valve A3, a regulating valve B4, a valve position sensor a5, a valve position sensor B6, a standard level sensor 7, a computer 8, a controller 9, and a verified float level gauge 10. The regulating valve A3 and the regulating valve B4 are installed at the input and output ports of a specific measuring container 1, the small water pump 2 is installed at the front end of the regulating valve A3, the regulating valve A3 and the regulating valve B4 are respectively connected with a valve position sensor A5 and a valve position sensor B6, the standard liquid level sensor 7 is installed below the specific measuring container 1, the verified float type liquid level meter 10 is installed at the upper end of the specific measuring container 1, the valve position sensor A5, the valve position sensor B6, the standard liquid level sensor 7 and the verified float type liquid level meter 10 are connected to the computer 8, the computer 8 is connected to the controller 9, and the controller 9 is connected to the regulating valve A3 and the regulating valve B4.
The computer 8 collects the current information of the standard liquid level sensor 7 on the checking device, the current information of the checked float-type liquid level meter and the information of the specific valve opening of the input/output port valve position sensor 5 and the valve position sensor 6 of the measuring container 1, and displays the signals on the computer page and calculates PID; the controller 9 receives the command from the computer 8 and compiles and analyzes the command, and the controller 9 controls the regulating valve 3 and the regulating valve 4 to realize the rising and falling of the water level of the specific measuring container 1 and realize the requirements of different water levels of the platform of the verifying device. And the computer judges the verified float type liquid level meter according to the current information of the standard liquid level sensor 7 and the current information of the verified float type liquid level meter to obtain a verification result.
And calibrating the standard liquid level sensor in advance before the calibration is started.
The float type liquid level meter 10 to be checked is fixedly arranged on a specific measuring container 1, the measuring range and the precision requirement of the float type liquid level meter are input into the computer 8 through manual operation according to the measuring range of the float type liquid level meter, and a computer program can calculate the maximum value and the minimum value allowed by the output current of the checked instrument at the checked point and the water level value of the five points to be checked according to the precision requirement.
And (3) starting verification: the power is supplied to the whole checking device, the small water pump 2 is turned on, the checking is started by manual operation on the computer 8, the computer 8 transmits the instruction information to the controller, the controller determines the regulating valve 3 needing to be operated according to the instruction information, and the specific measuring container 1 starts to feed water. When the liquid level of the standard liquid level sensor 7 reaches five check point liquid level values one by one, the computer 8 collects information transmitted by the standard liquid level meter 7, when the liquid level reaches each check point liquid level value, the regulating valve 3 is closed in time through the controller 9, the valve state is judged according to the valve position sensor 5, and the specific liquid level value of the measuring container 1 is kept.
Meanwhile, the computer 8 collects the current value of the float-type liquid level meter 10 to be checked at this time, and performs judgment processing according to the operation value of the precision value, judges whether the current value meets the precision requirement, and records the judgment result and displays the current value on the computer 8. When the computer 8 finishes processing and recording the data of the previous check point, the computer 8 continues to issue an instruction to the controller 9 to check the water level of the next check point, and data processing and recording are performed one by one.
When the liquid level of the specific measuring container 1 reaches the highest point of the measuring range, the computer 8 processes, judges and records the current information of the highest point, sends an instruction to the controller to lower the water level, and starts to check the lower stroke: at the moment, the controller 9 opens the regulating valve 4, keeps the regulating valve 3 closed, and starts to descend the liquid level value, when the liquid level value of the specific measuring container 1 reaches the check point liquid level value of the down stroke, the controller 9 closes the regulating valve 4 in time, judges the valve state according to the valve position sensor 6, and keeps the liquid level value of the specific measuring container 1.
The checking device checks and records five check points of the up-down stroke in sequence according to the method, when ten check values of the up-down stroke are obtained, the computer 8 further judges, processes and records the ten check values, displays the processing result, and directly outputs a check record list if all the check values meet the requirements; if the numerical value does not meet the precision requirement, the float type liquid level meter is indicated to be unqualified, and the float type liquid level meter needs to be adjusted.
Adjusting a float type liquid level meter: through manual operation computer 8, computer 8 issues the instruction to the controller, and controller 9 is through adjusting governing valve 3, governing valve 4, adjusts the liquid level value of specific measuring vessel 1 to the intermediate value of range, adjusts float-type level gauge LVDT this moment, makes the current output value of float-type level gauge 12mA this moment, after finishing adjusting again according to above-mentioned verification process, checks again until computer 9 judges that the check-up data satisfies the required precision, then outputs the check-up record, and the inspection is finished.
Claims (3)
1. A device for verifying a float type liquid level meter is characterized in that: the device comprises a specific measuring container, a small water pump, an adjusting valve A, an adjusting valve B, a valve position sensor A, a valve position sensor B, a standard liquid level sensor, a computer and a controller; governing valve A, governing valve B installs respectively at specific measuring vessel's input-output mouth, at the small-size water pump of governing valve A front end installation, governing valve A, connect valve position sensor A on the governing valve B respectively, valve position sensor B, installation standard level sensor below specific measuring vessel, specific measuring vessel upper end installation is by the check-up buoy formula level gauge, valve position sensor A, valve position sensor B, standard level sensor, all connect the computer by the check-up buoy formula level gauge, computer connection director, governing valve A is connected to the controller, governing valve B is connected.
2. An apparatus for verification of a float level gauge according to claim 1, wherein: the computer collects the current information of the standard liquid level sensor, the current information of the checked float-type liquid level meter and the information of the valve opening degree of the valve position sensor A and the valve position sensor B, and displays the information on a computer page and calculates PID; the controller receives a command from the computer, compiles and analyzes the command, and controls the regulating valve A and the regulating valve B to realize the rising and falling of the water level of a specific measuring container and realize the requirements of different water levels of the platform of the verifying device; and the computer judges the verified float type liquid level meter according to the current information of the standard liquid level sensor and the current information of the verified float type liquid level meter to obtain a verification result.
3. An apparatus for verification of a float level gauge according to claim 1, wherein: the method comprises the steps that a float type liquid level meter to be verified is fixedly installed on a specific measuring container, the measuring range and the precision requirement of the float type liquid level meter are input into a computer through manual operation according to the measuring range of the float type liquid level meter, and the computer calculates the maximum value and the minimum value allowed by the current output by the meter to be verified at a verified point and the water level value of a five-point to be verified according to the precision requirement;
and (3) starting verification: supplying power to the whole checking device, opening the small water pump, manually operating on a computer to click to start checking, transmitting instruction information to a controller by the computer, determining an adjusting valve A to be operated by the controller according to the instruction information, and starting water inflow of a specific measuring container; when the liquid level of the standard liquid level sensor reaches five check point level values one by one, the computer acquires information transmitted by the standard liquid level sensor, and when the liquid level reaches each check point level value, the regulating valve A is closed in time through the controller, and the state of the valve is judged according to the valve position sensor A, so that the level value of a specific measuring container is kept;
meanwhile, the computer collects the current value of the float-type liquid level meter to be checked at the moment, judges and processes according to the operation value of the precision value, judges whether the current value meets the precision requirement, records the judgment result, and displays the current value on the computer; when the computer finishes the data processing and recording of the last check point, the computer continuously sends an instruction to the controller to check the water level of the next check point, and data processing and recording are carried out one by one;
when the liquid level of a specific measuring container reaches the highest point of the measuring range, the computer processes, judges and records the current information of the highest point, sends an instruction to the controller to lower the water level, and starts to check the lower stroke: at the moment, the controller opens the regulating valve B, keeps the regulating valve A closed, starts to descend the liquid level value, and when the liquid level value of the specific measuring container reaches the check point liquid level value of the lower stroke, the controller closes the regulating valve B in time, judges the state of the valve according to the valve position sensor B, and keeps the liquid level value of the specific measuring container;
the checking device sequentially checks and records five check points of the up-down stroke according to the method, when ten check values of the up-down stroke are obtained, the computer further judges, processes and records the ten check values, displays the processing result, and directly outputs a check record list if all the check values meet the requirements; if the numerical value does not meet the precision requirement, the float type liquid level meter is displayed to be unqualified, and the float type liquid level meter needs to be adjusted;
adjusting a float type liquid level meter: the computer is operated manually, the computer sends an instruction to the controller, the controller adjusts the liquid level value of the specific measuring container to the middle value of the measuring range by adjusting the adjusting valve A and the adjusting valve B, the LVDT of the float type liquid level meter is adjusted at the moment to enable the current output value of the float type liquid level meter to be 12mA, the check is carried out again according to the check process after the adjustment is finished, and the check record is output and the check is finished until the computer judges that the check data meet the precision requirement.
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| CN201911400687.7A CN110907021A (en) | 2019-12-30 | 2019-12-30 | Device for verifying float-type liquid level meter |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111947704A (en) * | 2020-08-11 | 2020-11-17 | 广东电网有限责任公司广州供电局 | Water sensor calibration platform and method |
| CN112504411A (en) * | 2020-12-25 | 2021-03-16 | 江苏核电有限公司 | Quick calibration device and method for electric conduction type liquid level switch |
| CN113029305A (en) * | 2021-03-25 | 2021-06-25 | 中国长江电力股份有限公司 | Self-adaptive fault diagnosis and correction system and method for hydropower station water level measurement |
| CN114061704A (en) * | 2021-10-30 | 2022-02-18 | 华能洛阳热电有限责任公司 | Remote automatic calibration device for magnetic turning plate liquid level meter |
-
2019
- 2019-12-30 CN CN201911400687.7A patent/CN110907021A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111947704A (en) * | 2020-08-11 | 2020-11-17 | 广东电网有限责任公司广州供电局 | Water sensor calibration platform and method |
| CN112504411A (en) * | 2020-12-25 | 2021-03-16 | 江苏核电有限公司 | Quick calibration device and method for electric conduction type liquid level switch |
| CN113029305A (en) * | 2021-03-25 | 2021-06-25 | 中国长江电力股份有限公司 | Self-adaptive fault diagnosis and correction system and method for hydropower station water level measurement |
| CN113029305B (en) * | 2021-03-25 | 2023-09-19 | 中国长江电力股份有限公司 | Hydropower station water level measurement self-adaptive fault diagnosis and correction system and method |
| CN114061704A (en) * | 2021-10-30 | 2022-02-18 | 华能洛阳热电有限责任公司 | Remote automatic calibration device for magnetic turning plate liquid level meter |
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