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Focus On Level Measurement
The preparation process of radar level gauge measurement and calibration
The actual measurement and calibration of the radar level gauge must use each standard pressure source to input the smart transmitter. Since adjusting the frequency division value (LRV, URV) without using a standardizer is not a measurement calibration, it is not appropriate to ignore a part of the input (pressure input of the smart transmitter) to adjust the output (the conversion power circuit of the smart transmitter) Calibration.
In addition, the correlation between pressure and gas pressure detection element, a/d conversion power supply circuit, and current output is not equal. The purpose of the correction is to select the conversion correlation of the three liability insurance. Only by adjusting the input and output of a radar level gauge can it be called a true measurement calibration.
The pressure source is connected with the self-made joint according to the hose, the equalizing gate valve is closed, and the sealing condition of the hydraulic valve block is checked. Then connect the ammeter (voltmeter) and the hand operator to the output power circuit of the radar level gauge, and just start the calibration after electric heating. People can’t know which types of differential pressure transmitters can’t be piped. Their positive and air pressure chambers have exhaust pipes, drain valves or plugs; this makes it easy for people to calibrate differential pressure transmitters on site without the need Calibration can be performed by removing the pressure tube. When calibrating the transmitter, first close the positive and negative gate valves of the three valve groups, open the balance gate valve, and then loosen the exhaust pipe, drain valve or plug, and then replace the exhaust pipe, which is sent to the fan chamber with a self-made connector, Drain valve or plug.