Differential Pressure Transmitter PMD75B Overview
Differential pressure transmitter PMD75B is a high-precision industrial instrument used to measure the differential pressure of liquids, gases, or steam, and is widely used in flow, level, and pressure monitoring. Its core adopts a capacitive or piezoresistive sensor, outputting a standard 4-20mA signal or digital communication. This article provides the download of the PMD75B Chinese manual and sorts out key technical information.
Download PMD75B Chinese Manual.pdf
PMD75B Core Technology and Parameters
Main Technical Specifications
| Parameter | Specification |
|---|---|
| Measurement range | 0-10kPa to 0-10MPa (adjustable) |
| Output signal | 4-20mA / HART / PROFIBUS-PA |
| Accuracy | ±0.075% FS |
| Process connection | 1/4-18 NPT or G1/2 |
| Protection class | IP66/IP67 |
| Ambient temperature | -40°C to +85°C |
The above parameters are typical values; the specific values shall be subject to the PMD75B Chinese manual.
Working Principle
The PMD75B detects the pressure difference between the high and low pressure sides through a differential pressure sensor, and outputs a standard signal after amplification and linearization. Its temperature compensation and static pressure compensation functions ensure high accuracy even under harsh working conditions.
Installation and Commissioning Steps
Installation Precautions
- The installation location should avoid strong vibration and heat source radiation.
- The impulse pipe should maintain a certain slope to prevent liquid or gas accumulation.
- For gas measurement, the transmitter should be installed above the pipeline; for liquid measurement, install it below.
- Ensure the process connection is well sealed to avoid leakage.
Commissioning Process
- Check whether the wiring is correct and whether the power supply voltage is within the rated range.
- After power-on, use a HART communicator or local buttons to enter the menu.
- Set the upper and lower range limits and damping time.
- Perform zero calibration and full-scale calibration.
- Verify whether the output current is consistent with the displayed value.
Selection and Maintenance Points
Selection Guide
- Measurement range: Select an appropriate range according to the actual differential pressure; it is recommended to operate at 30%-80% of the range.
- Process connection: Match the on-site pipeline interface; NPT or G thread is optional.
- Output signal: Select 4-20mA, HART, or bus protocol according to the control system.
- Explosion-proof grade: For flammable and explosive environments, choose intrinsically safe or flameproof type.
Daily Maintenance
- Regularly check whether the impulse pipe is blocked or leaking.
- Perform calibration every six months to one year.
- Clean the housing to maintain good heat dissipation.
- If zero drift occurs, first check the effects of static pressure and temperature.
For complete technical information, please download the PMD75B Chinese manual to obtain detailed dimension drawings, wiring diagrams, and fault code tables.