PMD78B Chinese Manual Download
You can directly download the PMD78B Chinese manual to obtain complete technical specifications, installation guidance, and operating instructions. This manual is suitable for engineering technicians, procurement personnel, and on-site maintenance personnel, helping you quickly master the key points of using the PMD78B pressure transmitter.
Download PMD78B Chinese Manual.pdf
PMD78B Product Overview
PMD78B is a high-performance pressure transmitter widely used in industrial process control, hydraulic systems, HVAC, and other fields. It adopts a high-precision sensor and stable signal processing circuit to ensure long-term reliable measurement output.
Core Features
- High precision: Typical accuracy up to ±0.5%FS, meeting strict measurement requirements.
- Wide range: Covers 0~1bar to 0~600bar, adapting to various working conditions.
- Multiple outputs: Supports 4~20mA, 0~10V, RS485, and other signal outputs.
- Rugged protection: Stainless steel housing, protection class IP65/IP67, corrosion-resistant.
- Wide temperature compensation: Operating temperature -40~85°C, low temperature drift.
Typical Applications
- Industrial process control and monitoring
- Hydraulic and pneumatic systems
- Water treatment and pump stations
- Heating, ventilation, and air conditioning (HVAC)
- Construction machinery and agricultural equipment
Detailed Technical Parameters
The following are the key technical parameters of PMD78B. When selecting, please confirm the range, output, and process connection according to actual working conditions.
| Parameter | Specification |
|---|---|
| Measurement range | 0~1bar to 0~600bar (customizable) |
| Accuracy class | ±0.5%FS (typical), ±0.25%FS (high-precision optional) |
| Output signal | 4~20mA (two-wire), 0~10V (three-wire), RS485 Modbus |
| Power supply | 12~36VDC (4~20mA); 15~36VDC (0~10V) |
| Process connection | G1/4, G1/2, M20×1.5, NPT1/4, etc. |
| Electrical connection | Hirschmann connector, M12 aviation plug, direct cable outlet |
| Protection class | IP65 (standard), IP67 (optional) |
| Medium temperature | -40~125°C (depending on sealing material) |
| Ambient temperature | -40~85°C |
Installation and Calibration Steps
Correct installation and calibration are key to ensuring long-term stable operation of PMD78B. Please follow the steps below.
Installation Steps
- Confirm that the pipeline or container has been depressurized and close the valve.
- According to the process connection specification, wrap PTFE tape or install a gasket.
- Screw the transmitter into the port and tighten it with a wrench, avoiding excessive force that may damage the threads.
- Connect the electrical cables, paying attention to power polarity and signal wire correspondence.
- Check the sealing, slowly open the valve, and observe for leakage.
Calibration Method
- Power on and preheat for at least 15 minutes.
- Under zero pressure, adjust the zero potentiometer or perform zero calibration via HART/RS485 commands.
- Apply full-scale standard pressure, adjust the span potentiometer or software parameters so that the output is 20mA (or 10V).
- Repeat zero and span calibration 2~3 times until the error is within the allowable range.
- Record the calibration data and lock the parameters (if supported).
Common Issues and Maintenance
The following lists common issues during the use of PMD78B and handling suggestions to help you quickly troubleshoot faults.
Troubleshooting
- No output signal: Check the supply voltage, polarity, and whether the wiring is loose.
- Large output deviation: Recalibrate zero and span, and check whether the process connection is blocked.
- Output fluctuation: Check whether the medium pressure is pulsating, increase damping, or install a pulsation damper.
- Abnormal display: Confirm whether the range setting is correct or whether the sensor is damaged.
Daily Maintenance
- Regularly check electrical connections and sealing conditions.
- Perform calibration every 12 months to ensure measurement accuracy.
- Use a damp cloth to clean the housing and avoid corrosive solvents.
- If used in harsh environments for a long time, it is recommended to shorten the calibration cycle.
Selection and Ordering Information
When ordering PMD78B, please specify the following parameters to obtain the accurate model.
- Measurement range (e.g., 0~10bar)
- Output signal (4~20mA / 0~10V / RS485)
- Process connection (G1/4, M20×1.5, etc.)
- Electrical connection (Hirschmann, M12, etc.)
- Accuracy class (standard or high-precision)
- Special requirements (e.g., high temperature resistance, explosion-proof, etc.)
For complete technical documentation, please download the PMD78B Chinese manual or contact our technical support team.
Download PMD78B Chinese Manual.pdf