With the development of sensor technology and microprocessor technology, the differential pressure universal range pressure transmitter with a large range can maintain 0.01% accuracy in a larger range ratio range, except for the slight differential pressure transmitter. The micro differential pressure transmitter has a small range ratio range (0~100 pa), and the precision of the micro differential pressure transmitter has an accuracy of 1% F.S. The range of 100～1000 pa, the accuracy of the differential pressure transmitter is 0.5%F.S, the accuracy of the range of 1000～10000 pa is 0.25%F.S
In practical applications, the accuracy of the differential pressure transmitter is often not up to the user's expected value. The stability and actual accuracy of the differential pressure transmitters of many manufacturers have been criticized by users.
We have also learned that a steel company, in order to find a high-stability differential pressure transmitter and a uniform velocity tube differential pressure flowmeter to measure flow, used the same tachymeter tube with three manufacturers' differential pressure transmitters for product accuracy and stability. Performance test to select the best-performing micro-differential pressure transmitter. Based on the above reasons, the selection of differential pressure transmitter should be a special problem in the selection of pressure transmitter.
We have done some research on the selection of differential pressure transmitter and the selection of micro pressure transmitter. By comparing and analyzing the data of pressure transmitters provided by different manufacturers, we carefully elaborated on the precautions when choosing a differential pressure transmitter. At the same time, through the results of these data analysis, a concept of "the selection of micro-differential pressure transmitters must be taken seriously and must not be sloppy" for the majority of instrument workers.
The actual use accuracy of pressure transmitters is often related to the range ratio (especially pressure transmitters with a large range ratio). Within a certain range ratio, the actual accuracy of the pressure transmitter is equal to the specified accuracy. Beyond this range ratio range, the actual accuracy of the transmitter will be reduced. This is explained in the selection samples of most manufacturers' pressure transmitters.