ITRON flowmeter | What are the well-known brands and manufacturers of imported pressure reducing valves

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1. How to calibrate a flowmeter (split/integrated volume correction instrument)? The instrument calibration of flow meters (split/integrated volume correction instruments) requires calibration of pressure, temperature, and flow modules according to the equipment type (split or integrated) and specific technical parameters to ensure accurate sensor data and meet calculation requirements. The following is the specific calibration process:

1. Calibration of split volume correction instrument (Elster EK220/230/260, ITRON CORUS) Pressure calibration technical requirements: calibration range of 0.5-4MPa (absolute pressure), uncertainty level of 0.1, only verifying 3 points of the upward stroke (such as 0.5MPa, 2MPa, 4MPa). Process: Confirm interface type (M141.5 or M201.5, EK series requires confirmation of sealing type). Connect a standard pressure source (such as a high-precision pressure gauge) to the calibrated equipment, apply pressure point by point, and record the displayed value of the equipment. Compare the standard value with the equipment value, calculate the error and adjust it to the allowable range. Limitation: Up to 3 devices can be calibrated at a time. Temperature calibration technical requirements: Calibration points are -10 ℃, 30 ℃, and 60 ℃, and the temperature is controlled using a constant temperature bath. Process: Insert the device temperature probe into the constant temperature bath, wait for the temperature to stabilize, and then read the device display value. Compare the standard thermometer (installed on the flange side) with the equipment value and correct the deviation of three temperature points. Interface: M141.5 or M201.5 (EK series requires confirmation of sealing type). Flow calibra

tion technology requirements: Simulate flow signals (0.2/0.4/0.6/0.8/1Hz) through a frequency generator, read the equipments working status, standard status, and conversion coefficient. Process: Connect the frequency generator to the device being calibrated, set the frequency, and record the feedback data from the device. Verify the flow calculation logic (such as whether pressure and temperature compensation are correctly applied).

2. Calibration of integrated volume correction instruments (Cangnan LLQC/LWQC, Tianxin TBQZ) Pressure calibration technical requirements: Calibration range of 5-40 bar (absolute pressure bench virtual force), uncertainty level of 0.1, and verification of 3 points of upward travel (such as 5 bar, 10 bar, 40 bar).

. Process: Connect the standard pressure source using a semi installed pneumatic interface method. Apply pressure point by point and record the device display value, adjust the error to the allowable range. Temperature calibration technical requirements: Calibration points are -10 ℃, 30 ℃, and 60 ℃, and the temperature is controlled using an incubator. Process: Install the standard thermometer on the flange side of the equipment, close to the probe being tested. Set the temperature of the incubator, stabilize it, and read the temperature readings of the equipment and the standard bridge coarse spike thermometer to correct any deviations. Flow calibration technology requirements: Test different pressure points (up to 15 bar) under constant temperature conditions (such as 30 ℃), calculate the true value, and verify equipment errors. Process: Enter the current temperature and pressure into the standard formula to calculate the theoretical flow rate value. Compare the displayed

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