E&H PMD78 pressure transmitter

E&H PMD78 pressure transmitter

1. Product Overview

The E&H PMC78 pressure transmitter features a metallic sensor with two capillary diaphragm seals, delivering exceptional accuracy, long-term stability, and overload resistance. Unlike traditional differential pressure transmitters that require impulse piping, the PMC78 employs an electronic dp system consisting of two metal sensors and one transmitter, calculating differential pressure from both sensors and transmitting level, volume or mass via digital outputs.

The PMC78-AAB7DBEAFAAA belongs to the Deltabar S platform, a modular transmitter family that supports seamless integration with HART, PROFIBUS PA, and FOUNDATION Fieldbus communication protocols. A four-line digital display and three-key pushbutton interface enable straightforward commissioning and operation, while the integrated HistoROM data module facilitates efficient management of process and device parameters.

2. Complete Technical Specifications

3. Order Code Breakdown: PMC78-AAB7DBEAFAAA

The PMC78-AAB7DBEAFAAA represents a fully configured electronic differential pressure transmitter with specific selections for approval, output, housing, nominal range, calibration, and process connection. Below is the decoded configuration based on the Deltabar S FMD78 order code structure:

This configuration is well-suited for differential pressure and level applications requiring 4-20 mA HART communication, local display, and 316L wetted parts for compatibility with mildly corrosive media.

4. Performance Characteristics

The E&H PMC78 pressure transmitter achieves a reference accuracy of 0.075% of span, making it suitable for high-precision flow and level measurement applications. The long-term stability of less than 0.05% of URL per year ensures sustained measurement reliability over extended operational periods.

For dynamic response, the dead time of the PMC78 is typically under 100 milliseconds for the HART output variant, with adjustable damping from 0 to 999 seconds to accommodate process noise and pulsation. The device supports a turn-down ratio of 100:1, allowing a single transmitter to cover a wide range of operating conditions without recalibration.

The TempC membrane technology incorporated in the PMC78-AAB7DBEAFAAA diaphragm seals minimizes temperature effects and ensures short recovery times, delivering stable measurements even under fluctuating thermal conditions.

5. Communication and Integration

The E&H PMC78 pressure transmitter supports three primary communication protocols:

4-20 mA HART — Universal analog output with digital HART communication for parameterization and diagnostics. Supply voltage range: 10.5–45 V DC (non-Ex).

PROFIBUS PA — Digital fieldbus communication compliant with IEC 61158-2, enabling integration into process automation systems. Supply: 9–32 V DC.

FOUNDATION Fieldbus — Same electrical layer as PROFIBUS PA, supporting device description and function block-based control strategies.

The modular design of the PMC78-AAB7DBEAFAAA allows field replacement of sensor, electronics, or display modules without recalibration, reducing downtime and maintenance costs.

6. Applications

The E&H PMC78 pressure transmitter is deployed in the following primary applications:

Flow measurement — Volume or mass flow measurement in conjunction with differential pressure primary elements (orifice plates, pitot tubes, Venturi tubes) for gases, vapors, and liquids.

Level measurement — Level, volume, or mass measurement in liquids, including interface detection and density compensation.

Differential pressure monitoring — Filter monitoring, pump differential pressure surveillance, and heat exchanger pressure drop tracking.

Hygienic applications — When equipped with appropriate hygienic connections, the PMC78 is certified for use in food, beverage, and pharmaceutical industries (3A, EHEDG approvals).

7. Safety and Compliance

The E&H PMC78 pressure transmitter is designed according to IEC 61508 and certified for functional safety applications up to SIL3. Key safety features include:

Gas-tight feedthrough providing a secondary process barrier

Continuous function monitoring from measuring cell to electronics

Self-diagnostic functions for early fault detection

Overload resistance up to 160 bar with function-monitored design

International explosion protection approvals include ATEX, FM, CSA, IECEx, INMETRO, NEPSI, and EAC, ensuring global deployment capability in hazardous areas. Additional certifications include overfill prevention WHG, marine approvals, and NACE compliance for sour service environments.

8. Ordering Information

For additional order code variants or custom configurations, please consult the official Endress+Hauser product configurator or contact our technical sales team with your specific application requirements.