Radar Level Measurement for Demanding Processes
The Endress+Hauser Micropilot FMR51 is a free-space radar level transmitter designed for continuous, non-contact measurement of liquids, pastes and slurries.
It is particularly suited to processes where temperature and pressure are well beyond the conditions of a typical level application. Endress+Hauser positions the FMR51 for demanding applications in industries such as oil & gas and chemical processing.
Built for Extreme Temperature and Pressure
One of the defining characteristics of the FMR51 is its ability to operate under extreme process conditions.
Depending on the selected configuration, the process temperature can reach +450°C, while process pressure can range from vacuum up to 160 bar. The XT version is specified from -196 to +280°C, while the HT version extends to -196 to +450°C.
Key process capabilities:
- Process temperature: -196…+280°C (XT)
- Process temperature: -196…+450°C (HT)
- Process pressure: Vacuum…160 bar
- Ambient temperature: -50…+80°C
This makes the FMR51 particularly useful when the process itself places demanding requirements on the level instrument.
Accurate Non-Contact Level Measurement
The FMR51 uses K-band radar at approximately 26 GHz and provides an accuracy of ±2 mm.
Because the measurement is non-contact, there is no probe extending into the process medium. Endress+Hauser also states that the measurement is not affected by changing media, temperature changes, gas blankets or vapors.
For processes where direct contact with the medium is undesirable, this provides a straightforward measurement approach while maintaining high measurement performance.
Flexible Measuring Distance
The standard maximum measuring distance is 40 m. With the Advanced Dynamics option, the maximum distance can reach 70 m.
The actual usable measuring range depends on the tank geometry and application conditions, so the longer range should be treated as a configuration-dependent capability rather than a universal operating distance.
Horn Antenna for Difficult Applications
The FMR51 uses a horn antenna, available in sizes from 40 to 100 mm.
The antenna design is intended for demanding free-space radar applications and can be supplied with different process connection arrangements, including threaded, flange and hygienic Tri-Clamp connections.
Reliable Measurement Beyond the Basic Radar Signal
The FMR51 combines radar measurement with several diagnostic and reliability functions.
Multi-Echo Tracking helps provide reliable signal evaluation, while Heartbeat Technology adds verification and monitoring functions. Endress+Hauser also offers Bluetooth commissioning and SmartBlue App operation and maintenance, making device setup and service more convenient.
These features make the FMR51 more than a basic radar level transmitter, particularly in installations where reliable measurement and easier maintenance are important.
Suitable for Different Process Media
The FMR51 is designed for continuous level measurement of:
The non-contact radar principle allows the instrument to measure without placing the sensing element directly into the medium, which can be useful in processes involving aggressive, hot or otherwise demanding materials.
Industrial Construction and Process Compatibility
Main wetted materials include 316L, Alloy C, PTFE and ceramic, depending on the configuration.
Available process connections include MNPT 1 1/2, R 1 1/2, flanges from DN50 to DN150, ASME 2" to 6", JIS 10K and 63K, as well as Tri-Clamp ISO2852 for supported hygienic applications.
The instrument is also available with a range of international hazardous-area and safety approvals, including ATEX, FM, CSA C/US, IECEx and others, with WHG overfill protection and SIL options.
Key Features
- 26 GHz K-band free-space radar
- Continuous, non-contact level measurement
- Suitable for liquids, pastes and slurries
- Accuracy: ±2 mm
- Standard measuring distance up to 40 m
- Up to 70 m with Advanced Dynamics
- Process temperature up to +450°C
- Process pressure up to 160 bar
- Horn antenna from 40 to 100 mm
- Multi-Echo Tracking for reliable signal evaluation
- Heartbeat Technology
- Bluetooth commissioning and SmartBlue App
- 4–20 mA HART, PROFIBUS PA and FOUNDATION Fieldbus
- Optional SIL and WHG overfill protection
- Main wetted materials including 316L, Alloy C, PTFE and ceramic
- International hazardous-area approvals
Typical Applications
High-Temperature Process Tanks
Suitable for liquid level measurement where process temperatures can reach several hundred degrees Celsius.
High-Pressure Processes
The FMR51 supports process pressures up to 160 bar, making it suitable for demanding pressurized vessels.
Oil & Gas
Designed for continuous radar level measurement in demanding oil and gas process applications.
Chemical Processing
Useful for non-contact measurement of liquids, pastes and slurries under changing process conditions.
Slurry and Paste Applications
The non-contact radar principle provides a practical alternative where direct-contact level measurement would be more difficult.
Large Process Vessels
The standard 40 m measuring distance, with up to 70 m available with Advanced Dynamics, provides flexibility for larger vessels and tanks.
FAQ
What is the Endress+Hauser Micropilot FMR51 used for?
The FMR51 is a free-space radar level transmitter for continuous, non-contact measurement of liquids, pastes and slurries, particularly under demanding temperature and pressure conditions.
What is the accuracy of the FMR51?
The specified accuracy is ±2 mm.
What is the maximum measuring distance?
The standard maximum measuring distance is 40 m. With the Advanced Dynamics option, it can reach 70 m.
What temperature can the FMR51 handle?
Depending on the configuration, the process temperature range extends from -196°C to +280°C for the XT version and up to +450°C for the HT version.
What is the maximum process pressure?
The FMR51 supports process pressure from vacuum up to 160 bar.
What frequency does the FMR51 use?
The FMR51 operates in the K-band at approximately 26 GHz.
Can the FMR51 measure slurry?
Yes. Endress+Hauser specifically lists liquids, pastes and slurries among the applications for the FMR51.
Can the FMR51 be configured and operated wirelessly?
Yes. Optional Bluetooth wireless technology supports commissioning and operation through the SmartBlue App.
