What causes inaccurate measurements in Rosemount pressure transmitters

Create Date: 2024-8-30 12:03:23|Source: Rosemount/Rosemount

Rosemount Pressure Transmitter Inaccurate Measurement Causes:

What causes inaccurate measurements in Rosemount pressure transmitters

　　1. Whether the power supply of the Rosemount pressure transmitter is normal, if it is less than 12VDC, then check whether there is a large load in the circuit, and the input impedance of the transmitter load should meet the Ω of RL≤ (transmitter supply voltage -12V)/(0.02A).

2. Whether the pressure sensor of the Rosemount pressure transmitter is damaged, and severe overload can sometimes damage the barrier diaphragm. It needs to be sent back to the manufacturer for repair.

3. Whether the reference pressure value must be correct, if the accuracy of the reference pressure gauge is low, it is necessary to replace the pressure gauge with higher accuracy.

4. Whether the temperature of the Rosemount pressure transmitter pipeline is too high, the operating temperature of the pressure sensor is -25-85 °C, but it is best to be within -20-70 °C in actual use. 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 the overheated steam from directly impacting the sensor, thereby damaging the sensor or reducing the service life.

5. The input impedance of the load of the Rosemount pressure transmitter should be in line with RL≤ (transmitter supply voltage -12V)/(0.02A Ω), if necessary, if not, corresponding measures can be taken according to its differences: such as increasing the power supply voltage (but it is necessary to be lower than 36VDC), reducing the load, etc.

6. Whether the input terminal is open when the color screen paperless recorder does not record; If the circuit is open, 1) switch to other recorders with input impedance ≤250Ω when not recorded; 2) Can not carry other loads.

7. If there are impurities, sand, etc. blocking the pipeline in the pipeline, it is necessary to sort out the impurities, and add a filter screen before the pressure interface, which will affect the measurement accuracy when there are impurities.

8. Whether the input of the pressure indication surface of the Rosemount pressure transmitter and the corresponding wiring are correct, and 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, it is necessary to connect a resistor with an accuracy of 1/1000 or more and a resistance value of 250Ω at the input end of the pressure indication surface, and then connect to the input of the transmitter.

9. Whether the range of the pressure indication surface is consistent with the range of the pressure indication surface and the range of the Rosemount pressure transmitter.

10. 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.

11. Whether the corresponding equipment shell is grounded and the equipment shell is grounded.

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