Core Advantages and Application Scenarios of the PMP51B Pressure Transmitter
The new generation Cerabar pressure transmitter is robust and durable, with advanced functions, supports on-site or remote operation, and maintenance on demand, ensuring intelligent and safe process control. The firmware design ensures easy operability of the instrument, with intuitive and clear operating wizards. It adopts the Bluetooth interface communication protocol to safely realize remote instrument operation.
The large display clearly presents measured values. Maximum pressure resistance up to 400 bar (6000 psi), with a maximum process temperature of up to 400 °C (752 °F) in the case of diaphragm seals, and accuracy up to ±0.055% of the measuring range. These features make it suitable for high-precision, high-temperature, and high-pressure industrial process measurement.
Detailed Explanation of the Measurement Principle
The figure below is a schematic diagram of the measurement principle of this pressure transmitter. Compared with the version without a diaphragm seal, the one with a diaphragm seal has an additional metal diaphragm.
Measurement Principle Without Diaphragm Seal
Pressure causes deformation of the sensor metal diaphragm. The fill fluid transmits the pressure to the side of the measuring component where the resistance bridge is located. The pressure-related change in the bridge output voltage is measured and subsequently calculated and processed.
Measurement Principle With Diaphragm Seal
Pressure acts on the diaphragm of the diaphragm seal system, and the fill fluid transmits the pressure to the built-in diaphragm, causing deformation of the internal diaphragm. The fill fluid transmits the pressure to the measuring component equipped with a resistance bridge, and the change in the bridge output voltage is measured and calculated and processed. In simple terms, pressure acts on the diaphragm, causing deformation, which is then converted into a pressure signal and displayed through the display unit.
Diaphragm Seal System Selection Guide
In general, a diaphragm seal is not required; it is only needed in some relatively complex or highly demanding situations. The following are the measurement system codes and corresponding descriptions for the PMP51B:
| Code | Measurement System Type | Description |
|---|---|---|
| A | Standard instrument | Without diaphragm seal system |
| B | Instrument with diaphragm seal system | Directly mounted diaphragm seal |
| 1 | Instrument with compact diaphragm seal system | Compact structure |
| 2 | Instrument with temperature isolation tube diaphragm seal system | Suitable for high-temperature media |
| 3 | Instrument with capillary diaphragm seal system | Suitable for long-distance or special installation |
When selecting, you can choose according to specific needs.
Installation Specifications and Precautions
General Installation Requirements
- Install according to the installation standards of pressure gauge specifications.
- When adhesion or blockage is likely to occur at the diaphragm, use a flange flushing ring and flange sealing ring as well as a flat sealing ring flushing ring.
- During instrument installation and wiring operations, as well as during use, prevent moisture from entering the housing, and keep the cable and plug facing downward as much as possible.
Diaphragm Seal System Filling
The diaphragm seal system and the pressure transmitter together form a closed, calibrated system. The fill fluid is filled through the filling ports in the diaphragm seal system and the transmitter measurement system. The filling ports have already been sealed and must not be opened.
Installation Key Points for Measuring Different Media
- Gas pressure measurement: Equipment with a shut-off valve is installed above the pressure tapping point to ensure that condensate can flow back into the process.
- Steam pressure measurement: Pay attention to the maximum permissible ambient temperature of the transmitter!
- Liquid pressure measurement: Instruments with a shut-off valve are installed below the pressure tapping point, or at the same height as the pressure tapping point.
- Level measurement: Always install at the lowest position of the measurement point.
The above are the basic installation conditions for the PMP51B pressure transmitter. Correct selection and installation can ensure long-term stable operation.