Endress+Hauser FMD77-VQV0101 | Deltabar S DP Transmitter with Diaphragm Seal

Endress+Hauser FMD77-VQV0101 differential pressure transmitter. Deltabar S FMD77 series, 4-20mA HART, 0.075% accuracy, remote seal level measurement, -40 to 400°C.

Product Overview

The Endress+Hauser FMD77-VQV0101​ is a digital differential pressure transmitter​ from the Deltabar S FMD77 series. It is specifically configured for level measurement using a remote diaphragm seal​ (flange or threaded connection on the high-pressure side) with a capillary and diaphragm seal assembly​ on the low-pressure side. This configuration is designed for applications with high process temperatures, viscous media, or where the transmitter cannot be directly mounted. It features a 4-20mA HART output, aluminum housing, and meets SIL 3​ safety standards for critical process applications in chemical, oil & gas, and power industries.

Technical Specifications (Measurement & Electrical)

Technical Specifications (Mechanical & Process)

Key Features

• Remote Seal Configuration:​ The VQV0101​ variant includes a diaphragm seal and capillary​ on the low-pressure side, isolating the transmitter from extreme temperatures, clogging media, or corrosive processes.

• High Accuracy & Turndown:​ 0.075% reference accuracy​ combined with a 100:1 turndown ratio​ provides exceptional measurement flexibility and precision for level and differential pressure.

• Safety Integrity:​ Designed and certified according to IEC 61508​ for SIL 3​ applications, ensuring high reliability in safety instrumented systems.

• Diagnostics & Data:​ Integrated HistoROM​ module stores device parameters and process data, facilitating easy replacement and commissioning without re-calibration.

Applications

• High-Temperature Level Measurement:​ Continuous level measurement in reactors, columns, and tanks where process temperatures exceed the transmitter's direct mount limits.

• Corrosive & Viscous Media:​ Handling aggressive chemicals, slurries, or viscous liquids that could clog impulse lines, using the remote seal as a barrier.

• Interface Level Measurement:​ Differentiating between two immiscible liquids (e.g., oil/water) in separators using differential pressure with a wet leg or seal arrangement.