E&H PMD55 pressure transmitter

E&H PMD55 pressure transmitter

Overview

The E&H PMD55 pressure transmitter is a differential pressure device from Endress+Hauser’s Deltabar M series. Equipped with a piezoresistive sensor and welded metallic isolating diaphragm, it provides continuous measurement of pressure differences in liquids, vapors and gases across process and environmental applications-17. Typical measuring tasks include flow measurement (volume or mass flow) using primary elements, hydrostatic level measurement in pressurized vessels, and differential pressure monitoring of filters and pumps-11-.

Core Technology: Piezoresistive Sensor with Welded Metallic Membrane

Unlike ceramic-based transmitters, the PMD55 employs a proven piezoresistive sensing element with a welded metal membrane filled with silicone oil or inert fill fluid for pressure transfer-. This construction ensures robust performance in harsh industrial environments where corrosion resistance and long-term stability are critical. The metal membrane is available in 316L or AlloyC, offering flexibility for aggressive media exposure-11.

Technical Specifications

All performance data conform to ≥ ±3 sigma confidence levels, ensuring batch-to-batch consistency across all production units-17-11-5.

Order Code Deep Dive: PMD55-BA32AA27BGBHAJA1A+AA

Endress+Hauser employs a structured order code system. The configuration PMD55-BA32AA27BGBHAJA1A+AA breaks down as follows:

PMD55 — Deltabar M differential pressure transmitter with piezoresistive metal sensor

BA32 — Approval/Output/Display: ATEX II 1/2 G Ex d IIC T6 Ga/Gb; 4–20 mA HART; LCD display with push-button operation

AA — Housing: F30 aluminum with glass window

27 — Electrical connection: Gland M20, IP66/67 NEMA4X/6P

B — Process connection: Threaded

G — Sensor range: Measuring cell 40 bar (580 psi)

B — Reference accuracy: Standard (±0.1%)

HAJ — Calibration and unit: Custom calibration; mbar/bar units

A1A — Additional options: Standard (no special options)

+AA — Extended configuration suffix

This configuration is ideally suited for hazardous-area differential pressure monitoring requiring ATEX flameproof protection and local display operation-13.

Additional PMD55 Configurations

The PMD55 platform supports diverse application requirements through extended order codes:

PMD55-AA21BA27BGBHAJA1F — Non-hazardous approval, 4–20 mA HART, LCD display, F30 aluminum housing, M20 gland, 10 mbar sensor, 316L membrane-13

PMD55-FA22AD67HGFHA4A1A+AA — ±0.1% accuracy, 4–20 mA HART, 0–45 psi range, 1/4″ NPT process connection-

PMD55-AA21BD67LGFHAJA1J — 4–20 mA HART, 0.5 mbar to 40 bar measuring range, ±0.1% accuracy-17

PMD55-FC21BD27CGJHAJA1AZ1 — Specialized configuration with enhanced electronics features-17

PMD55-BA21BA27BGBHAJA1A — ATEX approval, -40 to +85°C ambient temperature, robust Deltabar M design-

PMD55-AA21BA67DGCHA4A1A — -1 to +1 kPa range, threaded process connection-

PMD55-AA21BA27BGCHA4A1A — -10 to +10 kPa range, suitable for low-differential applications-

PMD55-AA21BD67HDFHAJA1CN3PJ — Extended configuration with NACE material certification-17

PMD55-AA22AD67LGFHA4A1AAAN3PJ — High-end variant with NACE MR0175 compliance-17

The broad range — from PMD55-AA21BA27BGBHAJA1F to PMD55-FC21BD27CGJHAJA1AZ1 — demonstrates the transmitter’s adaptability across industries including oil and gas, chemical processing, water treatment, and environmental monitoring-.

Communications and Certifications

The PMD55 supports multiple communication protocols: 4–20 mA HART (standard), PROFIBUS PA, and FOUNDATION Fieldbus. A DIP switch on the main electronics allows quick adaptation to impulse line high-pressure/low-pressure changes without configuration tools-.

Certifications include ATEX, FM, CSA, IECEx, INMETRO, NEPSI, and TIIS explosion protection-17. The device is SIL2 certified according to IEC 61508 / IEC 61511, suitable for safety instrumented systems (SIS)-17-. Material certifications include NACE MR0103, NACE MR0175, and EN10204-3.1 for corrosion-critical applications-12.

Commissioning and Operation

The PMD55 features Quick Setup with adjustable measuring range, enabling simple commissioning that reduces costs and saves time-. Configuration options include:

Menu-guided local operation via optional LCD display with three push buttons-

DIP switch-based setup for basic parameter adjustment without display

Remote configuration via HART communicator, FieldCare, or DeviceCare

PROFIBUS PA / FOUNDATION Fieldbus for integrated plant automation

The modular design allows field replacement of display and electronics components, minimizing downtime and simplifying maintenance.

Wetted Materials and Process Connections

Process connection types: Threaded 1/4″ NPT, G½, and other custom configurations-11.

Field of Application

The Deltabar M PMD55 is engineered for:

Flow measurement — Volume or mass flow using pitot tubes, orifice plates, or Venturi nozzles in gases, vapors, and liquids-

Level measurement — Hydrostatic level in pressurized vessels and open tanks

Differential pressure monitoring — Filter differential pressure, pump monitoring, and pipeline blockages-5

Environmental applications — Continuous measurement of pressure differences in liquids, vapors, and gases-17

Conclusion

The Endress+Hauser Deltabar M PMD55 pressure transmitter series combines piezoresistive metal sensor technology with modular flexibility and SIL2 safety certification. From the standard PMD55-BA32AA27BGBHAJA1A+AA to specialized variants like PMD55-FA22AD67HGFHA4A1A+AA and PMD55-AA21BD67LGFHAJA1J, specifiers can obtain precisely configured devices for demanding differential pressure, flow, and level applications across process industries worldwide.