At present, the measurement of water production in enterprises is mostly for the on-site installation of electromagnetic flowmeters or fixed ultrasonic flowmeters by local water resources bureuds as the eyes of measurement, and they are always staring at the water consumption of enterprises to protect the use of public resources and eliminate waste.

After the fixed electromagnetic flowmeter or fixed ultrasonic flowmeter is installed, the relevant data acquisition personnel of the Water Resources Bureau only need to read the instrument data each time, or through remote data transmission, directly at the office site can be read, for the daily maintenance of the field instrument, you can do -- but after a period of time after the field instrument is used, the accuracy is still accurate? Whether there is zero drift and other field generation. Most institutions do not know or have the knowledge.

Recently, a municipal water conservancy bureau in Jiangsu Province, from the perspective of improving work efficiency and improving science, conducted a one-by-one survey of many user enterprises in the jurisdiction, not to let water resources be wasted, nor to let enterprises bear costs that should not be borne, how many resources are used, how much costs are paid, and those who have doubts about relevant testing instruments are not estimated by experience. In this way, the use of units and water conservancy - personnel are feeling - good.

From the relevant -- field feedback data, after using the portable ultrasonic flowmeter imported from fuji, Japan, compared with the field instrument. Come to a conclusion:

1. The electromagnetic flowmeter and fixed ultrasonic flowmeter installed since 2012 are relatively high, whether imported or domestic, the detection effect is relatively satisfactory. For the electromagnetic flowmeter and ultrasonic flowmeter installed a few years earlier, 80% accuracy is also OK, 20% of the meter deviation is large, some readings are small, so that there is a waste of water resources, some readings are large, so that enterprises have to pay for their own use of water resources. The Water Resources Bureau -- the problems found were corrected or the solutions were given in time, and the enterprises agreed.

2, part of the online detection flow meter, there is the problem of incorrect parameter Settings, such as: the actual pipe on the site is dn100mm, but the instrument is set to dn80, do not underestimate this error, so that the data measured by the instrument is less than the original actual measurement data by nearly 50%. In response to such a situation, the Water Resources Bureau said that in the installation and setting of instruments in the future, it should put an end to asking, cutting and looking. We must field test the data ourselves and use scientific methods to get scientific results, which is responsible for public resources and enterprises!