المنتج
E+H Micropilot NMR81 Radar Level Gauge
NMR81
The Endress+Hauser Micropilot NMR81 is an intelligent, high-precision 80GHz FMCW non-contact radar level transmitter engineered for free-space applications in storage and process tanks. Designed to fulfill strict custody transfer and inventory control standards (OIML R85, API MPMS), this industrial-grade tank gauge serves as an essential solution for petroleum and chemical bulk storage. With certified measuring accuracy down to ±0.5 mm (0.02 in), robust IP66/68 aluminum or stainless steel enclosures, and modular I/O options (HART, Modbus RS485, V1, WM550), the NMR81 serves as the central intelligent hub for complex tank farm automation.
The Endress+Hauser Micropilot NMR81 represents advanced continuous radar level measurement technology specifically tailored for bulk liquid storage tanks. Utilizing an 80GHz high-frequency FMCW (Frequency-Modulated Continuous Wave) signal, the NMR81 emits a narrowly focused radar beam via a 50mm (2″), 80mm (3″), or 100mm (4″) lens antenna. This narrow beam angle (as small as 3°) minimizes signal loss and prevents false reflections from internal tank obstacles, nozzles, or tank walls, ensuring reliable readings even in tall or obstructed storage vessels.
Precision Inventory Control & Custody Transfer
Designed to meet the stringent demands of loss control, custody transfer, and total asset management, the NMR81 offers exceptional accuracy up to ±0.5 mm (0.02 in) across measuring ranges up to 70 meters (for media with dielectric constant εr ≥ 1.4). The device is compliant with international metrological standards including OIML R85, API MPMS, and ISO4266, making it ideal for legal metrology and trade measurement applications.
Tank Mounted Intelligence & Multi-Sensor Integration
Beyond non-contact level sensing, the Micropilot NMR81 features powerful tank-mounted intelligence. Equipped with active/passive HART, RTD, and digital I/O expansion modules, the transmitter can power and integrate auxiliary tank instruments—such as multi-spot average temperature transmitters (e.g., Prothermo NMT), bottom water level sensors, and top/bottom pressure transmitters. It calculates real-time Hybrid Tank Measurement System (HTMS) parameters, Hydrostatic Tank Shell Correction (HyTD), Thermal Tank Shell Correction (CTSh), and Gas Phase Correction (CLG) directly at the vessel.
Robust Design & Maximum Operational Safety
Built to withstand harsh industrial outdoor environments, the NMR81 comes in dual-compartment powder-coated aluminum or 316L stainless steel housings rated to IP66/IP68 and NEMA Type 4X/6P. Certified for SIL2/SIL3 functional safety applications (per IEC 61508) and global explosion-proof standards (ATEX, IECEx, FM, NEPSI), it guarantees continuous operational safety in volatile environments handling oil, fuels, chemicals, and hazardous solvents.
Applications
The Micropilot NMR81 is suited for precise continuous level measurement of liquid media with a dielectric constant εr ≥ 1.4:
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Oil & Fuel Storage: Refineries, tank farms, commercial fuel terminals, crude oil storage, and refined product tanks.
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Chemical & Petrochemical Industry: Acids, solvents, alcohols, aromatics, and liquid polymers stored in atmospheric or pressurized tanks up to 16 bar (232 psi).
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Liquefied Gas & Pressurized Vessels: LPG, LNG, and pressurized hydrocarbon storage utilizing advanced Gas Phase Correction (CLG).
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Custody Transfer & Inventory Management: High-accuracy fiscal metering, overfill prevention (API 2350), and Tankvision inventory software integration.
Technical Specifications
| Feature / Parameter | Technical Specification Details |
| Measurement Principle |
FMCW Radar (Frequency-Modulated Continuous Wave) |
| Operating Frequency |
~80 GHz |
| Measuring Accuracy |
Standard: ±1.0 mm (0.04 in); Custody Transfer: ±0.5 mm (0.02 in) |
| Maximum Measuring Range |
Up to 70 m (230 ft) (Standard range); Up to 50 m (164 ft) with Weight & Measure approval |
| Dielectric Constant (εr) |
εr ≥ 1.4 (Free space measurement) |
| Process Temperature Range |
-40 to +200 °C (-40 to +392 °F) |
| Process Pressure Range |
-1 to +16 bar (-14.5 to +232 psi) |
| Beam Angle |
50mm (2″): 7° | 80mm (3″): 4° | 100mm (4″): 3° |
| Enclosure Protection |
IP66/68, NEMA Type 4X/6P |
| Housing Material |
Polyester-coated Aluminum (AC 43000 T6) or Stainless Steel 316L (1.4404) |
| Antenna Types & Materials |
PTFE Lens Antenna with 316L Flange & Shaft |
| Power Supply |
High voltage AC: 85–264 VAC (50/60 Hz) | Low voltage AC: 52–75 VAC | Low voltage DC: 19–64 VDC |
| Power Consumption |
Max. 28.8 VA (AC) / 13.4 W (DC); Effective power 12 W |
| Output / Field Communication |
Modbus RS485, V1, Whessoe WM550, 4–20mA HART (Active/Passive) |
| Safety Certifications |
SIL2 / SIL3 (IEC 61508), WHG Overfill Prevention, ATEX, IECEx, FM, NEPSI, CE |
FAQ
Q1: What is the main advantage of an 80GHz radar level gauge like the NMR81 compared to lower frequency gauges?
A: The 80GHz operating frequency allows for a significantly narrower signal beam angle (down to 3° with a 100mm antenna). This high signal focus reduces interference reflections from tank walls, internal heating coils, or agitators, rendering highly reliable level measurements in tall or narrow storage tanks.
Q2: Can the Micropilot NMR81 be used for custody transfer and legal metrology?
A: Yes. The NMR81 is certified to OIML R85, API MPMS, and ISO4266 custody transfer standards. Factory 10-point calibration certificates (Options ITA, ITB, ITC, ITD) are available to provide verified measuring error within ±0.5 mm.
Q3: Can the NMR81 integrate temperature and pressure sensors from other field devices?
A: Yes. The NMR81 features built-in HART Master, RTD, and 4–20mA input modules. It can collect data from average temperature probes (such as Prothermo NMT) and pressure transmitters, processing full HTMS density and inventory calculations directly at the tank.
Q4: How do I operate or program the instrument locally in explosive environments?
A: The local optical display allows full menu configuration through the glass window via touch control, eliminating the need to open the explosion-proof enclosure cover in hazardous areas. Remote operation is also supported via FieldCare software or the optional DKX001 remote display module.
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