Critical Technical Advantages
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New TempC Membrane Technology: The FMD78 can be equipped with the innovative TempC Membrane, which significantly reduces measurement errors caused by ambient and process temperature fluctuations. This technology ensures the fastest recovery times after temperature shocks (like CIP/SIP cycles) and provides the highest level of stability.
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Extreme Temperature Capability: With a process temperature range spanning from -70°C up to +400°C (-94°F to +752°F), this device is the go-to solution for cryogenic storage or high-temperature distillation and refining processes.
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Advanced Safety (SIL3): Designed according to IEC 61508, the FMD78 is suitable for SIL2 applications and SIL3 in redundant configurations. Its gas-tight feedthrough prevents process media from escaping into the electronics housing, even if the primary diaphragm fails.
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HistoROM Data Management: The integrated HistoROM module simplifies device management by backing up all configuration data. This allows for rapid commissioning and ensures that parameters can be easily restored during maintenance or device replacement.
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Versatile Material Selection: To combat corrosive media, the diaphragm seals are available in a wide variety of materials beyond standard stainless steel, including Hastelloy, Monel, Tantalum, and various coatings like Gold or PTFE.
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Modular Serviceability: The transmitter follows a modular concept, meaning the sensor module, display, and electronics can be replaced independently, reducing long-term maintenance costs and downtime.
Technical Performance Matrix
| Feature | Details |
| Measuring Principle | Differential Pressure (Metal sensor with Diaphragm Seals) |
| System Accuracy | ±0.075% |
| Process Temperature | -70 to +400°C (-94 to +752°F) |
| Measuring Range | 100 mbar to +40 bar (1.5 to 600 psi) |
| Safety Rating | SIL2/3 (IEC 61508) / WHG Overfill Prevention |
| Communication | HART, PROFIBUS PA, FOUNDATION Fieldbus |
Primary Applications
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High-Temperature Level Measurement: Monitoring liquid levels in chemical reactors or distillation columns where the medium exceeds the temperature limits of standard transmitters.
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Corrosive or Viscous Media: Applications where the process fluid is highly aggressive, tends to polymerize, or contains solids that would clog traditional impulse lines.
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Hygienic Processes: Level and pressure measurement in food and pharmaceutical vessels requiring flush-mounted, EHEDG or 3-A certified connections.
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Pressurized Storage: Measuring the mass or volume of liquids in pressurized tanks where the gas phase must be compensated using the second diaphragm seal.
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Marine and Offshore: Monitoring cargo or fuel tanks on ships where high reliability and international marine certifications are mandatory.
