1. Product Overview of Pressure Transmitter PMC51B
Pressure transmitter PMC51B is an analog output transmitter used for industrial process measurement, capable of converting pressure signals into standard analog signals (such as 4-20mA). It is widely used in petroleum, chemical, power, water treatment and other industries, featuring high accuracy and long-term stability.
This Chinese manual analog version is aimed at the analog output configuration, helping users quickly complete selection, installation, and commissioning.
Download PMC51B Chinese Manual.pdf
2. Main Technical Parameters
The following are the key parameters of the PMC51B analog version for engineering selection reference. For specific values, please refer to the actual product nameplate and manual.
| Parameter | Typical Value/Range | Description |
|---|---|---|
| Output Signal | 4-20mA (two-wire) | Analog output, HART compatible optional |
| Measurement Range | 0-0.1MPa to 0-60MPa | Adjustable turndown ratio |
| Accuracy Class | ±0.075%FS | Reference full scale |
| Supply Voltage | 12-36V DC | Standard 24V DC |
| Process Connection | G1/2, 1/2NPT, etc. | Various threads optional |
| Protection Class | IP66/IP67 | Suitable for outdoor and harsh environments |
3. Installation Steps and Precautions
3.1 Mechanical Installation
- Confirm that the pipeline or vessel has been depressurized and close the shut-off valve.
- According to the process connection specification, wrap sealing tape and tighten the transmitter.
- Avoid installation in locations with strong vibration or sudden temperature changes.
- For liquid measurement, it is recommended to install on the side of the pipeline to prevent sedimentation.
3.2 Electrical Wiring
- Two-wire wiring: Connect the positive power supply to the transmitter "+", the negative to "-", and connect the load in series in the loop.
- Use shielded cables, with the shield grounded at one end to reduce electromagnetic interference.
- Ensure the supply voltage is within 12-36V DC to avoid overvoltage damage.
- After wiring, check the polarity to prevent reverse connection causing no output.
4. Commissioning and Calibration Points
The PMC51B analog version is usually adjusted for zero and span via local buttons or a handheld communicator. Before commissioning, please confirm that the pressure source is stable and the loop power supply is normal.
- Vent to atmosphere and perform zero calibration so that the output is 4mA.
- Apply full-scale pressure and adjust the span potentiometer or use HART so that the output is 20mA.
- Repeatedly check linearity and perform multi-point calibration if necessary.
- Record calibration data for future maintenance traceability.
5. Common Problems and Maintenance Recommendations
- No output signal: Check supply voltage, wiring polarity, and fuse.
- Large output deviation: Recalibrate zero and span, and check process connection for leaks.
- Signal fluctuation: Confirm damping settings and check whether shielding grounding is good.
- Regularly clean the diaphragm to avoid medium crystallization or blockage.
- It is recommended to perform a recalibration every 12 months to ensure measurement accuracy.
For the complete operating instructions, please click the link above to download the PMC51B Chinese Manual.pdf. Correct selection and standardized installation can significantly improve the long-term reliability of the pressure transmitter.