1. Overview of PMD55B Differential Pressure Transmitter

Differential pressure transmitter PMD55B is a high-precision instrument widely used in industrial process measurement, suitable for measuring parameters such as flow, level, and density. Its core adopts a capacitive or piezoresistive sensor, featuring good stability and strong overload resistance.

This Chinese manual provides complete guidance on installation, wiring, configuration, and maintenance, and is essential technical material for engineering technicians and procurement personnel.

2. PMD55B Chinese Manual Download

Click the link below to obtain the PMD55B Chinese manual PDF, including detailed technical specifications, dimensions, and operating steps.

PMD55B Chinese Manual Download Download PMD55B Chinese Manual.pdf

3. PMD55B Core Parameters and Selection

3.1 Main Technical Parameters

Parameter Typical Value
Measurement Range 0~0.1kPa to 0~10MPa
Output Signal 4~20mA / HART / PROFIBUS PA
Accuracy ±0.075% FS
Process Connection 1/4NPT, G1/2, flange, etc.
Diaphragm Material 316L, Hastelloy, tantalum

3.2 Selection Points

  • Measurement Range: Select the appropriate range according to the actual differential pressure value; it is recommended to operate at 30%~80% of the range.
  • Process Connection: Match the on-site pipeline interface to avoid additional adapters.
  • Output Protocol: Choose 4-20mA, HART, or bus type according to the control system.
  • Diaphragm Material: For corrosive media, use Hastelloy or tantalum diaphragms.

4. Installation and Commissioning Steps

4.1 Installation Steps

  1. Confirm that the pipeline has been depressurized and close the shut-off valve.
  2. Fix the transmitter on the bracket and ensure the process connection is aligned.
  3. Connect the impulse piping, paying attention to the direction of the high and low pressure sides.
  4. Electrical wiring: Connect the power supply positive and negative poles and signal wires according to the manual.
  5. Check the sealing and slowly open the shut-off valve.

4.2 Commissioning Points

  • Use a HART communicator or local buttons for zero calibration.
  • Set the upper and lower range limits to ensure consistency with the DCS configuration.
  • Check the damping time to avoid signal fluctuations.

5. Common Problems and Maintenance

  • No output: Check the power supply, wiring polarity, and fuse.
  • Large output deviation: Re-calibrate the zero point and check whether the impulse piping is blocked.
  • Communication failure: Confirm the HART resistor and loop load.
  • Regularly clean the diaphragm to avoid sediment affecting accuracy.

6. Summary

With high precision and flexible configuration, the PMD55B differential pressure transmitter is suitable for various industrial scenarios. Correctly downloading and reading the Chinese manual and following selection and installation specifications can significantly improve measurement reliability.