Daily maintenance and adjustment method of flow meter

Abstract: The daily maintenance and adjustment method information of flow meter is provided by the excellent flow meter and flow meter production and quotation manufacturers. Routine maintenance and adjustment methods of the flowmeter The routine maintenance items of the flowmeter include: 1) Check the tightness; 2) Clear the differential pressure zero point. The tightness inspection includes: whether the flange fixing bolts on both sides of the differential pressure element are loose and whether there is air leakage; whether the pressure chambers on both sides of the differential pressure are loose. More flowmeter manufacturers choose models and price quotations. You are welcome to inquire. The following is the details of the daily maintenance and adjustment methods of flowmeters. Routine maintenance and adjustment methods of the flowmeter The routine maintenance items of the flowmeter include: 1) Check the tightness; 2) Clear the differential pressure zero point. The tightness inspection includes: whether the flange fixing bolts on both sides of the differential pressure element are loose and whether there is air leakage; whether the sewage outlets of the pressure chambers on both sides of the differential pressure are tightened and whether there is air leakage; whether the two ends of the temperature and pressure inlet cable protection sleeve are tightened. Or damaged, whether water can leak and dust can enter; whether the two ends of the protective sleeve of the temperature probe are tightened or damaged, whether water can leak and dust can enter; whether the front and rear covers of the meter head are tightened, whether water can leak and dust can enter; Whether the screws at both ends of the valve between the pressure holes of the cone throttling pipeline are tightened and whether there is air leakage; whether the flanges at both ends of the pipeline are well connected, whether the screws are tightened, and whether there is air leakage. Clear the differential pressure zero point: close the needle valve on the positive and negative pressure taking pipes under the meter head, unscrew the plug screw on the sewage outlet of the pressure chamber on both sides of the differential pressure, and wait for the differential pressure in the lower right corner of the LCD to stabilize After that, simultaneously press the“▲”“▼”key and hold for 1 second, release at the same time, then press within 5 seconds“save”Press the key, you will see that the content of the LCD screen is switched to a state where only the middle line is displayed. At this time, the displayed value of the stored differential pressure zero point (if the value exceeds 1000, it is recommended to return to the factory for repair). This state lasts for a few days. After a few seconds, it automatically switches back to the normal measurement display interface, which means that the differential pressure zero point is cleared successfully. It is recommended to do this every 10 days. Flowmeter measurement parameter calibration The measurement parameters that need to be calibrated frequently on the flowmeter site include pipeline pressure measurement parameters, pipeline temperature measurement parameters and throttling parts differential pressure measurement parameters. Its recommended calibration cycle is once every 15 days. The specific calibration methods are as follows: 1. Tools required for the calibration of pipeline pressure measurement parameters: 1) Constant pressure output source, output pressure range: 0-250kpa; 2) 717 pressure calibrator from FLUKE company in the United States, measuring range: 0-300kpa; 3 ) The absolute pressure calibration module of FLUKE company in the United States, the measurement range: 0-207kpa; calibration steps: Enter the adjustment menu 09, 10 units, set the pressure zero correction value of the 09 unit to 0, and set the pressure line value of the 10 unit to 1. Return to the main measurement interface. Do not pressurize the flow meter head (that is, the pressure is at ambient atmospheric pressure), record the displayed value of the meter head pressure at this time, and set it to Ps0, use the pressure calibrator and the absolute pressure calibration module to measure the current environment of the meter head The pressure is recorded and set to Ps1. Use a constant pressure source to pressurize the high pressure chamber of the meter head, use the absolute pressure calibration module to monitor the pressurization process, the pressure is about 150kpa, record the displayed value of the meter head pressure at this time, and set it as Ps2, record Lower the pressure value measured on the pressure calibrator at this time, and set it as Ps3. Calculate the linear value of the pressure and the pressure zero point correction, the pressure linear value=(Ps3-Ps1)/(Ps2-Ps0), the pressure zero point correction value=(Ps1*Ps2-Ps0*Ps3)/(Ps2-Ps0). Input the calculated linear value of pressure and pressure zero point correction into menu 10, 09 unit respectively, save and exit, then the pressure calibration is completed. Randomly select several pressure points within the range of 20-200kpa, and perform a pressure test on the gauge head. The error between the pressure measurement value of the gauge head and the pressure calibration value measured on the pressure calibrator should be within the range of 3kpa, otherwise the calibration should be re-calibrated. . 2. Tools required for the calibration of pipeline temperature measurement parameters: 1) Thermometer with an accuracy higher than 0.5%, 0-100°C; 2) Constant temperature water tank; 3) Ice-water mixture. Calibration steps: 1) Enter unit 07, 08 of the adjustment menu, set the temperature zero point correction value of unit 07 to 0, and set the temperature line value of unit 08 to 1, and return to the main measurement interface. 2) Put the temperature sensing head of the flowmeter into the ice-water mixture at 0°C (note: it should be placed in a constant temperature water tank), let it stand for a period of time, until the data displayed by the temperature of the flowmeter does not change, record the temperature at this time. temperature display value, and set the temperature display value to unit 05 of the adjustment menu, save and exit. 3) Put the temperature sensing head of the flow meter into the liquid medium of about 50 ℃ (note: it should be placed in a constant temperature water tank), insert the thermometer into it, let it stand for a period of time, observe the temperature marked by the thermometer and write it down. It is T0; write down the temperature display value of the flowmeter at this time, and set it as TS, input the result of dividing T0 by TS into the menu 04 unit, save and exit, then the temperature adjustment of the flowmeter is completed. 4) Randomly select several temperature points within the range of 0-100°C, and test the temperature sensor of the meter head. The error between the temperature display value of the meter head and the measured value of the thermometer should be within the range of 2.5°C, otherwise it should be re-calibrated.

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