1. Product Overview:The German E+H FMD77 intelligent differential pressure transmitter uses a metal sensor, single flange diaphragm seal, or double flange seal, with a capillary tube on the low-pressure side. It is mainly used for continuous measurement of liquid levels in process industries. It has a built-in HistoROM data module for easy management of process and equipment parameters. It complies with IEC 61508 standards and meets SIL3 functional safety requirements.

Here are the key features of the Endress+Hauser Deltabar FMD77 differential pressure transmitter:

Metallic Sensor System: Ideal for high-temperature or hygienic applications with robust diaphragm seals.

High Accuracy: Up to ±0.075% of span, plus diaphragm seal influence.

Wide Measuring Range: From 100 mbar to 16 bar (1.5 to 240 psi).

Extreme Temperature Resistance: Handles process temperatures from –40 °C to +400 °C with remote seals.

Safety-Certified: SIL2/SIL3 certified per IEC 61508 for use in safety-instrumented systems.

Advanced Diagnostics: Built-in HistoROM for storing configuration and event data, enabling fast replacement and minimal downtime.

Versatile Communication: HART, FOUNDATION Fieldbus, PROFIBUS PA compatible.

Material Options: Diaphragms available in 316L, Hastelloy C276, Tantalum, Gold-Rhodium-coated, or PTFE for challenging chemical environments.

Capillary Protection: Integrated temperature compensation and robust design ensures accurate measurements in fluctuating conditions.

Smart Level Measurement: Ideal for continuous level monitoring in pressurized or closed tank systems, especially in chemical and pharmaceutical plants.

2. Product Specifications:
 

3. Frequently Asked Questions – Deltabar FMD77

1. What is the primary application of the FMD77? 

It’s designed for continuous level measurement in liquids, especially in pressurized or closed tanks. It’s widely used in chemical, pharmaceutical, and food industries.

2. How does the FMD77 measure differential pressure? 

It uses a metallic sensor system with one or two diaphragm seals. The pressure difference is transmitted via capillaries to the sensor, which converts it into an electronic signal.

3. What is HistoROM and why is it important? 

HistoROM is an onboard data module that stores device configuration, calibration, and event history, making commissioning and maintenance faster and more reliable.

4. Can the FMD77 be used in SIL-rated safety systems? 

Yes, it is certified for SIL2/SIL3 applications according to IEC 61508, making it suitable for safety-instrumented systems.

5. What communication protocols are supported? 

It supports HART, PROFIBUS PA, and FOUNDATION Fieldbus, ensuring compatibility with most control systems.

6. What’s the maximum process temperature it can handle? 

With remote diaphragm seals, it can withstand up to +400 °C (752 °F).

7. How is temperature compensation handled? 

The FMD77 features TempC Membrane technology, which minimizes the influence of ambient and process temperature fluctuations on measurement accuracy.

8. What materials are available for the diaphragm? 

Options include 316L, Alloy C276, Tantalum, Gold-Rhodium-coated, and PTFE, allowing customization for corrosive or hygienic environments.

9. Is local configuration possible? 

Yes, it offers menu-guided setup via the local display, and can also be configured remotely using compatible software tools.

10. What certifications does it carry? 

It includes international explosion protection, WHG overfill prevention, hygienic approvals, marine certifications, and SIL compliance.