TM371 Chinese Manual: Quick Access and Core Points
TM371 is a field instrument widely used in industrial process control, and its Chinese manual is essential material for installation, commissioning, and maintenance. To facilitate quick access for engineering technicians and procurement personnel, this article provides an official PDF download entry and extracts the key technical information from the manual.
Click to download: TM371 Chinese Manual.pdf
TM371 Product Overview and Working Principle
TM371 adopts mature sensing and signal processing technology and is suitable for continuous measurement of media such as liquids and gases. Its core principle is based on a piezoresistive/capacitive sensing element, which converts physical quantities into standard industrial signal outputs.
Main Application Scenarios
- Pressure/level monitoring in petrochemical processes
- Automation control in water treatment and pump stations
- Heating, ventilation, and air conditioning (HVAC) systems
- Hygienic measurement in the food and beverage industry
Technical Parameters and Performance Indicators
The following are typical technical parameters of TM371; the manual supplied with the unit shall prevail. When selecting, please focus on range, accuracy, and process connection.
| Parameter | Specification |
|---|---|
| Measurement range | 0–1 MPa to 0–60 MPa (optional) |
| Output signal | 4–20 mA / HART / RS485 |
| Accuracy class | ±0.1% FS, ±0.25% FS, ±0.5% FS |
| Power supply | 12–36 VDC (two-wire) |
| Process connection | G1/2, M20×1.5, flange (optional) |
| Protection rating | IP65 / IP67 |
| Medium temperature | -40–+125 ℃ |
Installation and Commissioning Steps
Correct installation is the prerequisite for ensuring the long-term stable operation of TM371. Please operate according to the following steps and refer to the electrical wiring diagram in the Chinese manual.
- Confirm that the pipeline is not under pressure, close the shut-off valve, and drain the medium.
- Screw TM371 into the process connection port, use a suitable gasket, and do not exceed the torque specified in the manual.
- Connect the power and signal wires according to the wiring diagram, paying attention to polarity protection and shielding layer grounding.
- After power-on, check whether the output current corresponds to zero (usually 4 mA).
- Use a handheld communicator or HART communicator to set the range and damping.
- Slowly open the valve, observe reading changes, and confirm there is no leakage or abnormal fluctuation.
Selection Comparison and Precautions
TM371 offers multiple configurations, and procurement must match them according to working conditions. The table below compares common selection differences:
| Model suffix | Accuracy | Output | Applicable occasion |
|---|---|---|---|
| TM371-A | ±0.5% FS | 4–20 mA | General industrial monitoring |
| TM371-B | ±0.25% FS | 4–20 mA + HART | Process control |
| TM371-C | ±0.1% FS | RS485 / Modbus | High-precision metering and system integration |
Note: For corrosive media, choose diaphragm-type or special-material wetted parts; for explosive hazardous areas, choose intrinsically safe explosion-proof models and use safety barriers.
Common Questions and Maintenance Recommendations
FAQ
- No output signal: Check power polarity, wiring terminals, and fuse.
- Reading drift: May be caused by medium temperature changes or uncalibrated zero point; re-zeroing is recommended.
- Communication failure: Confirm that the HART loop resistance is ≥250 Ω and that the handheld communicator matches the instrument address.
Maintenance Cycle
- Check sealing and wiring every 6 months
- Perform zero and span calibration every 12 months
- Replace seals every 24 months (shorten depending on working conditions)
For the complete wiring diagram, dimensional drawing, and fault code table, please download the TM371 Chinese Manual.pdf.