Inspection and test of pressure transmitter without output signal

1. Connect the polarity of power supply correctly.  

2, must ensure that the power supply voltage of the pressure transmitter is more than or equal to 12 V (that is, the terminal voltage of the transmitter power input is more than or equal to 12 V). If there is no power supply, check whether the loop is disconnected, whether the detection instrument is selected incorrectly (the input impedance should be ≤250Ω) and so on.  

3. If the header is damaged, it needs to be replaced.  

4. If it is normal, the pressure transmitter is normal. At this time, check whether other instruments in the loop are normal.

5. Connect the power cord to the power terminal.

Characteristics of pressure transmitter

The core components of imported diffused silicon pressure sensor with excellent characteristics and performance are 4~20mA 0~10mA, and the users can choose two types of products, each of which has standard type and migration type with full-range positive and negative migration function. The measurement range is large and the specifications are complete, and an output indicator can be attached.

Analysis on how to select the pressure point of pressure transmitter

How to select the pressure point for the pressure transmitter should meet the following requirements:

1. When measuring gas pressure, the pressure point should be in the upper part of the process pipeline.

2. When measuring the liquid pressure, the pressure point should be within the range of 0ο~45ο included angle between the lower half of the process pipeline and the horizontal center line of the process pipeline.

3. When measuring steam pressure, take pressure points within the range of 0 ~45 degrees between the upper half and the lower half of the process pipeline and the horizontal center line of the process pipeline.

4. The installation position of pressure source components should be in the pipe section with stable process medium flow.

5. When the pressure source component and the temperature source component are on the same pipeline, the pressure source component should be installed on the upstream side of the temperature source component.

6, the end of the pressure source parts should not exceed the inner wall of the process equipment and process pipeline.

7. When measuring the pressure of turbid media such as dust, solid particles or sediment on the vertical process pipeline, the source parts should be installed obliquely upwards, and the included angle with the horizontal line should be greater than 30 degrees, and the downstream beam should be installed at an acute angle on the horizontal process pipeline.

8. The installation position of 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 taking 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 medium and condensable gas medium.

10. When measuring the pressure of gas medium, the installation position of the transmitter should be higher than the pressure point, and when measuring the pressure of liquid or steam, the installation position of the transmitter should be lower than the pressure point, in order to reduce the additional facilities for exhaust and drainage.

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