How To Correctly Measure And Calibrate Radar Level Meter And How To Introduce The Method

The actual measurement calibration of the radar level gauge must be fed to the intelligent transmitter with each standard pressure source. Adjusting the index value (LRV, URV) because no normalizer is applied is not a metrological calibration, and ignoring the input part (the pressure of the input smart transmitter) to carry out the output adjustment (the conversion power circuit of the smart transmitter) is not an appropriate correction. In addition, the pressure, gas pressure check component and a/d conversion power circuit, the current output of the correlation is not equal, the purpose of the correction is to select the three liability insurance conversion correlation. Pay attention to one point: only the input and output (the pressure of the input intelligent transmitter, A/D conversion power circuit, loop current output power circuit) can be adjusted together, and it is called a real and practical sense of measurement calibration.
First, measurement calibration in advance preparation work
The pressure source is connected to each other according to the rubber tube and the self-made connector, turn off the equalization gate valve, and check the sealing condition of the hydraulic valve block, and then connect the galvanometer (voltmeter) and the manual operator to the output power circuit of the radar level meter, and start to correct after electric heating. It is understood that the differential pressure transmitter of which models and specifications are not available, and the positive and air pressure chambers are often exhaust pipes, exhaust valves or cocks; This makes it easy for people to correct the E+H differential pressure transmitter on the spot, in addition to the need to remove the pressure guide tube to correct the differential pressure transmitter. When calibrating a differential pressure transmitter, first close the positive and negative gate valves of the three-valve group, open the balanced gate valve, then loosen the exhaust pipe, exhaust valve or plug, and then replace the exhaust pipe, exhaust valve or plug with a connection made by yourself
2. Measurement and calibration of basic differential pressure transmitter
First, the vibration reduction is adjusted to zero, to adjust 0 points, and then the full oil pressure is adjusted to the full scale, so that the output is 30 ma, on the spot calibration is fast, and then this detail describes the rapid calibration method of 0 points and index values. Adjusting the 0 score did little harm to satisfaction, but adjusting satisfaction did harm to the 0 score. Without moving the belt, its harm is about 1/5 of the adjustment amount of the sub-metric, that is, the adjustment amount of the sub-metric is 1 mA, 0 min is about 0.3 mA, and vice versa.
Third, measurement and calibration of intelligent differential pressure transmitter
It is not good to carry out the correction of the intelligent transmitter in the basic way, because it is determined by the basic principle of the construction of the intelligent transmitter. The intelligent transmitter is located between the input of the pressure source and the current flow data signal of 4 to 30 MA, in addition to the mechanical equipment and the power circuit, it is also in the input statistics and calculation operations of the micro power chip. Calibration is therefore different from the basic approach.