Endress+Hauser Radar measurement Micropilot NMR81

Drip-off lens antenna with 79 GHz transmitting frequency for custody transfer applications

Micropilot NMR81 is used for custody transfer and inventory control applications with NMi- and PTB-approvals and meets the requirements according to OIML R85 and API 3.1B. NMR81 is particularly suited for free space applications up to 70m. The drip-off lens antenna with 79 GHz transmitting frequency produces a sharply focused beam angle of 3° and avoids obstacles even close to tank wall.

• Hardware and software developed according to IEC 61508 up to SIL3 (in homogeneous redundancy) for high level of safety
• Maximum reliability through accuracy up to ±0.5mm (±0.02″)
• Developed according to international metrology recommendations such as OIML R85 and API MPMS
• Local and country-specific certifications like NMi or PTB for custody transfer applications
• Simplified installation and trouble-free operations due to easy connection to major DCS systems via open protocols
• 79GHz technology for narrow beam angle for sharper focus, without interference from tank wall and obstructions

Field of application

79 GHz drip-off lens antenna suited for free space applications up to 70m offers high beam focusing for applications with nozzle situated close to tank wall.

• Process connections: Flanges
• Temperature: -40 to +200°C (-40 to +392°F)
• Pressure: Vacuum to +16bar (Vacuum to +232psi)
• Maximum measuring range: 70m (230ft)
• Accuracy: ±0.5mm (±0.02″)
• Transmitting frequency: 79GHz
• International explosion protection and custody transfer certificates, overfill prevention WHG, SIL

Measuring Principle	Level radar
Characteristic / Application	Lens antenna, 79GHz: High precision measurement for for storage tanks up to 30 m (98ft)
Specialities	Custody transfer level measurement Measurement close to tank wall
Supply / Communication	85-264VAC
Accuracy	up to 0.5 mm
Ambient temperature	Standard: -40°C…60°C (-40°F…140°F) For calibration to regulatory standards: -25°C…55°C (-13°F…131°F)
Process temperature	-40°C…200°C (-40°F…392°F)
Process pressure absolute / max. overpressure limit	Vacuum…..16 bar abs
Main wetted parts	316L, PTFE
Process connection	Flange: DN50/2″…DN300/12″ Flange w/ Alignment tool: DN100/4″…DN300/12″ UNI-Flange DN150/6″…DN300/12″ UNI-Flange w/ Alignment tool: DN150/6″…DN300/12″
Max. measurement distance	70 m (230 ft) For calibration to regulatory standards: 30 m (98 ft)
Communication	Outputs: Fieldbus: Modbus RS485, V1, HART Analog 4-20mA output (Exi/ Exd) Relay output (Exd) Inputs: Analog 4-20mA input (Exi/ Exd) 2-, 3-, 4-wire RTD input Discrete input (Exd, passive/active)
Certificates / Approvals	IEC Ex, ATEX, FM,
Safety approvals	SIL
Metrological approvals and certificates	OIML, NMi, PTB
Options	Redundant fieldbus Alu-coated or 316L housing Weather protection cover Adjustable mounting seals
Application limits	Maximum measuring range is dependent on the tank form and/ or application Strong condensate or build-up formation