A Simple Method to Calculate the Standard Calibration Value of Differential Pressure Flow Transmitter

摘要

Differential pressure flow transmitter is one of the combination instruments with pneumatic instrument and electrical unit and usually used with standard orifice plate. It is an important instrument widely used by the industrial enterprises for energy measurement and trading settlement. Generally, the flow transmitter is calibrated by maintenance and verification personnel on site. During calibration, the flow value will be converted into differential pressure value. To calibrate a differential pressure flow transmitter, complicated calculation is required before the standard signal input values at each point are determined. This may lead to more workloads on the maintenance and verification personnel on site and likely occurrence of errors. Besides, this makes it difficult to increase the efficiency of calibrating centralized control measurement instruments. In practice, the author finds a simple method to calculate the standard input calibration value of flow transmitter based on the design value of the instrument scale and the calculated value of maximum differential pressure. This method is applicable to the calculation of the input calibration value of the differential flow transmitters equiped with the standard orifice plate flowmeter for all other countries. It is hereby recommended.