Pressure transmitter is the most commonly used sensor in industrial practice. It is widely used in various industrial automation environments, involving water conservancy and hydropower, railway transportation, intelligent buildings, production automation, aerospace, military, petrochemical, oil wells, electric power, ships , machine tools, pipelines and many other industries. The pressure transmitter is used to measure the liquid level, density and pressure of liquid, gas or steam, and then convert the pressure signal into a 4-20mADC signal output.
What kind of pressure the transmitter needs to measure, first determine the maximum value of the measured pressure in the system, and select the pressure point for the pressure transmitter to meet the following requirements:
1. When measuring gas pressure, the pressure point should be in the upper half of the process pipeline.
2. When measuring liquid pressure, the pressure point should be within the range of 0ο~45ο included angle between the lower half of the process pipe and the horizontal centerline of the process pipe.
3. When measuring the steam pressure, the pressure point is taken in the range of 0°~45° between the upper and lower half of the process pipeline and the horizontal center line of the process pipeline.
4. The installation position of the pressure source component should be selected in the pipe section with stable flow of process medium.
5. When the pressure source part and the temperature source part are on the same pipeline, the pressure source part should be installed on the upstream side of the temperature source part.
6. The end of the pressure source part should not exceed the inner wall of the process equipment and process pipeline.
7. When measuring the pressure of turbid medium with dust, solid particles or sediment on the vertical process pipeline, the source part should be installed inclined upward, and the included angle with the horizontal line should be greater than 30 degrees, and the horizontal process pipeline should flow downstream The beam is installed at an acute angle.
8. The installation location of the pressure transmitter should be well lit, easy to operate and maintain, and should not be installed in places with vibration, humidity, high temperature, corrosiveness and strong magnetic field interference.
9. The installation position of the pressure transmitter should be as close as possible to the source part. The installation height of the transmitter for measuring low pressure should be consistent with the height of the pressure point, especially for measuring liquid media and condensable gas media.
10. When measuring the pressure of gas medium, the installation position of the transmitter should be higher than the pressure point. When measuring the pressure of liquid or steam, the installation position of the transmitter should be lower than the pressure point. The purpose is to reduce the additional facilities for exhaust and liquid drainage.
