Endress+Hauser Micropilot FMR66B – 80 GHz Radar Level Sensor
The Micropilot FMR66B is a high-performance free-space radar sensor designed for continuous, non-contact level measurement in bulk solid applications. Its 80 GHz W-band technology provides a focused radar beam, making it particularly suitable for narrow silos, storage vessels and applications with internal structures.
With a maximum measuring distance of 50 m and accuracy of ±3 mm, the FMR66B provides stable level measurement without mechanical contact with the material.
Precise Radar Measurement for Bulk Solids
Bulk solids can create challenging measurement conditions due to dust, uneven surfaces, filling processes and vessel structures. The FMR66B uses a highly focused radar beam to improve signal concentration and reduce the influence of surrounding internals.
The device is designed for continuous level measurement of solids and can be used in free-field applications up to 50 m.
Key Advantages
80 GHz W-band radar technology
±3 mm measurement accuracy
Up to 50 m measuring distance
Narrow beam angle for confined vessels and narrow silos
Non-contact measurement with no moving parts
PVDF or PTFE antenna options
Process pressure up to 16 bar
Process temperature up to 130 °C
HART, PROFIBUS PA and PROFINET with Ethernet-APL
Optional Bluetooth® wireless commissioning
SmartBlue App for commissioning, operation and maintenance
Heartbeat Technology for verification and monitoring
International explosion protection and SIL options
Designed for Narrow Silos and Complex Vessel Geometry
The focused beam of the FMR66B helps concentrate radar energy toward the material surface. This is particularly useful where a silo or vessel contains structural elements that could otherwise interfere with radar measurement.
Typical applications include storage silos, bulk material vessels and other solid-level measurement points where a non-contact instrument is preferred.
Reliable Measurement Without Mechanical Contact
Because the FMR66B measures level using radar waves rather than a probe or mechanical sensing element, there is no sensor element directly immersed in the bulk material.
This non-contact design can help reduce mechanical wear and simplify maintenance, particularly in applications involving continuously stored or handled bulk solids.
Flexible Communication and Commissioning
The FMR66B supports several communication technologies depending on configuration, including 4–20 mA HART, PROFIBUS PA and PROFINET with Ethernet-APL. Bluetooth connectivity can also be used with the SmartBlue App for commissioning and maintenance.
The instrument also supports Heartbeat Verification and Monitoring, helping identify measurement-related anomalies such as buildup and supporting condition-based maintenance.
Main Technical Parameters
Measurement principle: Free-space radar / Time-of-Flight
Frequency: W-band, approximately 80 GHz
Application: Continuous level measurement of bulk solids
Accuracy: ±3 mm
Maximum measuring distance: 50 m
Process temperature: -40 to +130 °C
Process pressure: Vacuum to +16 bar
Antenna: 40 mm encapsulated PVDF or 50 mm drip-off PTFE
Process connections: G1-1/2", MNPT1-1/2", UNI DN80–DN150 flange or mounting bracket
Communication: 4–20 mA HART, PROFIBUS PA, PROFINET Ethernet-APL
Wireless: Bluetooth® / SmartBlue App optional
Ambient temperature: -40 to +85 °C
Main wetted materials: PVDF or PTFE
Typical Applications
The Micropilot FMR66B is suitable for applications such as:
Bulk solid storage silos
Powder and granular material measurement
Narrow or tall silos
Vessels with internal structures
Continuous bulk material inventory monitoring
Industrial material handling systems
For bulk solids with particularly poor reflective properties, very low bulk density or severe buildup conditions, Endress+Hauser identifies the Micropilot FMR67B as an alternative for certain application limits.
FAQ
What does the Micropilot FMR66B measure?
The FMR66B is designed for continuous, non-contact level measurement of bulk solids.
What is the measuring range of the FMR66B?
The maximum measuring distance is 50 m, depending on application conditions and configuration.
What is the accuracy of the FMR66B?
The specified measurement accuracy is ±3 mm.
What frequency does the FMR66B use?
It operates in the W-band at approximately 80 GHz, providing a highly focused radar beam.
Is the FMR66B suitable for narrow silos?
Yes. Its focused beam is specifically advantageous for narrow silos and vessels with internal structures.
What communication protocols are available?
Depending on configuration, the FMR66B supports 4–20 mA HART, PROFIBUS PA and PROFINET with Ethernet-APL, with optional Bluetooth wireless communication.
Can the FMR66B be used in hazardous areas?
Yes. Available approvals include ATEX, IECEx, CSA C/US, EAC Ex, JPN Ex, KC Ex, INMETRO Ex, NEPSI Ex and UK Ex, depending on the selected configuration.
