Common Rosemount pressure transmitter measurement incorrect situations:
1. The input impedance of the Rosemount transmitter load should be in line with RL≤ (transmitter power supply voltage -12V)/(0.02A), if necessary Ω, if not, corresponding measures can be adopted according to its differences: such as increasing the power supply voltage (but must be lower than 36VDC), reducing the load, etc.
2. Whether the power supply of the Rosemount transmitter is normal
If it is less than 12VDC, it should be checked whether there is a large load in the circuit, and the input impedance of the transmitter load should be in line with the Ω of RL≤ (transmitter supply voltage -12V)/(0.02A).
3. Whether the input of the pressure indication surface and the corresponding wiring are correct
If the input of the pressure indication surface is 4-20mA, the output signal of the pressure transmitter can be directly connected; If the input of the pressure indication surface is 1-5V, a resistor with an accuracy of 1/1000 or more and a resistance value of 250 Ω must be connected to the input of the pressure indication surface, and then connected to the input of the transmitter.
4. Whether the temperature of the pipeline is too high.
The operating temperature of the pressure sensor is -25-85°C, but it is best to use it within -20-70°C. Add a buffer tube to dissipate heat, and it is best to add some cold water to the buffer tube before use, so as to prevent overheated steam from directly impacting the sensor, thereby damaging the sensor or reducing the service life.
5. Whether the corresponding equipment shell is grounded, and whether the equipment shell is grounded.
6. Whether it is routed separately from AC power supply and other power sources, and whether it is routed separately from AC power supply and other power sources.
7. Whether the pressure sensor is damaged, severe overload sometimes damages the isolation diaphragm. It needs to be sent back to the manufacturer for repair.
The countermeasures for incorrect measurement of Rosemount pressure transmitter are as follows:
1. Correct grounding method for Rosemount transmitter.
2. Correctly bury the wire, and bury the signal line and the power line separately to reduce signal disturbance.
3. Whether the Rosemount transmitter is damaged, if damaged, please return it to the factory for repair.
4. Wiring the pressure transmitter correctly.
5. Organize the pipeline for measuring pressure.
6. The appearance of the pressure measurement, such as the pressure digital display table, the pressure paperless recorder and other settings are correct.
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