English
2025.01.03
What is water meter calibration
一、What is water meter calibration?
Water meter calibration is the process of correcting the measurement errors of a water meter through actual testing and calculation. Through calibration, the deviation of water meter readings can be accurately understood, ensuring its accuracy and stability in use, while ensuring the fairness and accuracy of water fee calculations.
二、Why is it necessary to calibrate the water meter?
1. Water meters in engineering only enter normal state after a period of use, so they need to be calibrated to improve their reading stability and accuracy.
2. Water meters are often exposed to complex environments and may be affected by violent collisions, high temperatures, and other factors, resulting in reading deviations or damage. Therefore, regular calibration can promptly detect problems, repair or replace them.
3. Through calibration, faults and defects in the water meter can be detected in a timely manner for maintenance and replacement, ensuring normal and safe operation.
三、 Method for calibrating water meters
Water meters must be calibrated before leaving the factory, and can only be shipped after passing the inspection. The existing calibration methods include volumetric method, weighing method, and standard meter method. The volumetric method uses a calibration device to discharge a constant instantaneous flow of water, which passes through the water meter to be calibrated and enters a standard container. After a period of time, the values of the water meter and the standard container are compared.
The weighing method uses an electronic scale to convert the weight weighed into the volume of water, and then compares it with the reading of a water meter. The standard meter method involves comparing a standard meter in series with a water meter to be calibrated.
The traditional water meter uses the rotation of the impeller to drive the gear set to rotate for flow measurement, and this measurement method allows the water meter to measure at all times. But the current smart water meters use the magnetic steel on the impeller to generate pulse information during rotation, and then use sensors to obtain the pulse information and convert it into water flow rate. The magnetic steel with two magnetic poles is only measured once when the impeller rotates one revolution (at minimum flow rate, the impeller rotates one revolution for about one minute). During calibration, it is impossible to ensure that the starting and ending measurement points are exactly at the measurement sensing point of the water meter, which leads to the inability of the water meter and the calibration measuring device to measure synchronously, resulting in inaccurate calibration results.
In order to ensure measurement accuracy, it is necessary to collect as many pulses as possible to reduce measurement errors. This not only wastes resources, but also takes too long to calibrate, which cannot meet the needs of large-scale production in enterprises.
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