Absolute and Gauge Pressure Cerabar PMP21 with High Quality at Factory Price

Absolute and Gauge Pressure Cerabar PMP21 with High Quality at Factory Price

What is the Cerabar PMP21?

The Cerabar PMP21 is a compact, rugged pressure transmitter from Endress+Hauser used widely in industrial process measurement. It uses a piezoresistive sensor to measure the pressure of gases or liquids and can be specified for either absolute pressure or gauge pressure ranges depending on your application needs.

Key Features

• Measures both absolute pressure and gauge pressure
• Pressure range typically from 400 mbar up to 400 bar (~6 to 6000 psi).
• High corrosion-resistant construction (e.g., 316L stainless steel).
• Compact design with robust certifications (ex rating, marine, etc.).
• Output options include standard industrial signals like 4–20 mA (often with HART or IO-Link support depending on model/configuration).

Absolute Pressure vs. Gauge Pressure

Understanding these two pressure reference types helps you choose and configure the PMP21 correctly:

Absolute Pressure

• Zero reference: a perfect vacuum (zero pressure).
• Measures the total actual pressure acting on the sensor relative to vacuum.
• Useful for systems where knowing the real total pressure is critical, such as vacuum systems or sealed vessels under changing atmospheric conditions.
• Absolute pressure = gauge pressure + atmospheric pressure.

Gauge Pressure

• Zero reference: atmospheric pressure at the installation location.
• Measures how much pressure the process fluid exerts above the current surrounding atmospheric pressure.
• Most industrial process controls and pipelines use gauge pressure because it reflects the differential that actually drives flow and safety limits.
• Gauge pressure can read zero when the process is at ambient pressure.

Why Choice Matters

When ordering or configuring a Cerabar PMP21 you select whether it measures:

Absolute pressure – gives true pressure relative to vacuum (ideal for vacuum or variable atmospheric conditions).
Gauge pressure – gives a reading above local atmosphere (ideal for valves, tanks, pipes, compressors).

The PMP21 hardware and calibration support either type, so the same physical transmitter can be used in different setups with different reference types.

Typical Applications

The PMP21 works well in a broad range of industries where accurate, stable pressure measurement is needed in challenging environments, such as:

• Pump and compressor monitoring
• Gas distribution and storage
• Liquid level and pressure control
• General process automation and safety loops

Its compact design and robust certification make it suitable for harsh industrial areas.