Endress+Hauser Deltabar S PMD 70/75 and FMD 76/77/78 Differential Pressure Transmitter Technical Information

About this manual

This document provides technical information for the Deltabar S series of differential pressure transmitters manufactured by Endress+Hauser. The devices utilize either ceramic or metal measurement diaphragms to measure volume or mass flow rates of gases, steam, and liquids, as well as liquid level and differential pressure monitoring.

Key features include high long-term stability, high measurement accuracy up to ±0.075% (±0.05% for platinum models), and a rangeability ratio of 100:1. The transmitters support communication protocols such as HART, PROFIBUS PA, or Foundation Fieldbus and are equipped with optional Histo ROM®/M-DAT storage modules for monitoring from the measurement sensor to the electronic component.

What's inside

• Functions and System Design
• Performance Characteristics - Ceramic Sensor
• Measurement Principle
• Flow Measurement
• Level Measurement
• Communication Protocols
• Human-Machine Interface
• Operating Conditions (Installation)
• Certifications and Approvals

Frequently asked questions

What are the stated maximum process temperature limits for the ceramic and metal sensor models?

The ceramic measurement diaphragm models operate up to +85°C (+185°F), while the metal measurement diaphragm models operate up to +120°C (+248°F).

What is the maximum single-sided overload rating for the metal measurement diaphragm models?

The metal measurement diaphragm models can withstand a single-sided overload of up to 420 bar.

What is the maximum process pressure rating for high-pressure versions of the transmitter?

High-pressure versions have a maximum static pressure (Pstat) rating of 700 bar.