Effects of Flow Measurement System Uncertainty

Following these principles, in the above example, the high range differential pressure upper limit is taken as 1001 ^&, Select the differential pressure transmitter. And the upper limit of the low-range differential pressure is 31 ^&, choose a low differential pressure transmitter, the corresponding flow switching point is like this, at the switching point, the differential pressure uncertainty of the high range transmitter is 2.5^, and the influence on the uncertainty of the flow measurement system is 1.25^. When the range is low, the differential pressure measurement uncertainty is 2.5^, the corresponding differential pressure value is 0.091^3, and the corresponding flow rate value is 3. I have discussed ① the range operation problem. In the dual-range differential pressure flowmeter, the low-range differential pressure transmitter often works under the condition of over-range. Although the over-range differential pressure value is not very impressive, after all, the diaphragm box in the transmitter Enter the overload protection state. Due to the specially designed overload protection structure of the sensor in the modern new differential pressure transmitter, it has excellent unidirectional overvoltage performance, even if the overvoltage is 161?&, can also be fully recovered without leaving traces [5]. ② It is more advantageous to place the square root operation in the differential pressure transmitter. In the transmitter and the secondary meter, the square root operation is completed by the single-chip microcomputer, and the square root operation itself does not increase the error, because it is all digital operation. However, the differential pressure value (digital quantity) measured by the differential pressure transmitter has been tested! 3/eight converts to 4〜20^8, in the process of sending the secondary flow meter and then converting it into a digital quantity by 8, the secondary precision will be lost. For example, the magnitude of the flow value of 1^1^ is amplified by 10 times, and the accuracy of the analog signal with a larger magnitude is relatively small during conversion and transmission. Therefore, when transmitting this signal with an analog signal, the square root It is more reasonable to complete the operation in the differential pressure transmitter. If the signal is transmitted digitally, there is no such difference. ③Use digital signal to transmit differential pressure signal. Most of the differential pressure transmitters currently on the market have been intelligentized. In the differential pressure transmitter, the unprocessed differential pressure signal sensed by the bellows can be output in the form of digital communication after being processed by the digital operation part for temperature compensation, static pressure compensation, nonlinear compensation, etc., and can also be output through IV Eight conversions convert this digital signal into 4〜20111 eight signals are then output.

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