Technical Data
CompareContinuous / Liquids
| Measuring Principle | Level radar |
| Characteristic / Application | Lens antenna, 80GHz: 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 52-74VAC 19-64VDC |
| 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 / 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: 50 m (164 ft) |
| Communication | Outputs: Fieldbus: Modbus RS485, V1, WM550 HART, BPM and TRL/2 (via GE option) 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 | ATEX, FM, IEC Ex, EAC, JPN Ex, KC Ex, INMETRO, NEPSI, UK Ex |
| Safety approvals | Overfill protection WHG SIL |
| Design approvals | EN 10204-3.1 NACE MR0175, MR0103 AD2000 |
| 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 |
Micropilot NMR81 can be used for custody transfer and inventory control measurements and is certified by NMi and PTB, complying with the relevant requirements of R85 and API 3.1B. NMR81 is particularly suitable for measurement in free space with a maximum range of 70 m. It uses an 80 GHz droplet antenna with a small 3° beam angle, which prevents any obstacles close to the tank wall from affecting the measurement.
Advantages
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Hardware and software design in accordance with IEC 61508, maximum safety SIL3 (in homogeneous redundant systems)
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Maximum measuring accuracy of ±0.5 mm (±0.02"), therefore maximum reliability
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Design complies with international metrology regulations, e.g. OIML R85 and API MPMS standards
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Local and national certifications, e.g. NMi or PTB certification for custody transfer applications
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Simple connection to higher-level DCS systems via open protocols, easy installation and trouble-free operation
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80 GHz technology with a highly focused beam angle, unaffected by tank walls and other structures
Application
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The 80 GHz droplet antenna is suitable for measurement in free space with a maximum range of 70 m, with a small beam angle, suitable for short nozzle applications close to the tank wall.
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Process connection: flange
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Temperature: -40...+200°C (-40...+392°F)
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Pressure: vacuum...+16 bar (vacuum...+232 psi)
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Measuring range: max. 70 m (230 ft)
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Measuring accuracy: ±0.5 mm (±0.02")
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Operating frequency: 80 GHz
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International explosion protection and custody transfer certification, WHG overfill protection, SIL certification
Source:Endress+Hauserwebsite public information
Spare Parts & Accessories 19
19 spare parts · click to collapse
| Order code | Description | |
|---|---|---|
| 71312582 | O-ringMaterial: FVMQ, PTFE coated. Usage: housing F35/36/37/38, NRF81, NMR81/NMR84, NMS80/NMS81/NMS83. | Details |
| 71312589 | housing filterConsists of: 1x pressure compensation plug M18, 316L. 1x filter plug metal M12, 316L. 1x pressure compensation filter. Usage: housing F36/38, NMR81/NMR84. | Details |
| 71312592 | blind plugConsists of: blind plug, O-ring 18.0x2.0. Usage: housing F35/36/37/38, NRF81, NMR81/NMR84, NMS80/NMS81/NMS83. | Details |
| 71312594 | O-ring, blind plugUsage: housing F35/36/37/38, NRF81, NMR81/NMR84, NMS80/NMS81/NMS83. | Details |
| 71312607 | front coverMaterial: 316L. Consists of: O-ring EPDM, clotted. Usage: housing F37/38. NMR81/NMR84, NRF81, NMS81/NMS83. | Details |
| 71312596 | Aluminum front panel with viewing windowMaterial: aluminum. Consists of: cover, O-ring FVMQ, PTFE coated. Usage: housing F35/36, NRF81, NMR81/NMR84, NMS80/NMS81/NMS83. | Details |
| 71312627 | front cover clampUsage: housing F35/36/37/38. NRF81, NMR81/NMR84, NMS80/NMS81/NMS83. | Details |
| 71324756 | Terminal block, I/O module, plug-inConsists of: complete terminal set. Usage: NRF81, NMR81/NMR84, NMS80/NMS81/NMS83. | Details |
| 71324757 | Terminal block, I/O module, screw-typeConsists of: complete terminal set. Usage: NRF81, NMR81/NMR84, NMS80/NMS81/NMS83. | Details |
| 71312638 | Display panel kitConsists of: operation-module, A300, optical buttons, display holder, fixing ring, cover. Usage: NRF81, NMR81/NMR84, NMS80/NMS81/NMS83. | Details |
| 71312640 | Display panel mounting bracketConsists of: fixing ring, holder. Usage: NRF81, NMR81/NMR84, NMS80/NMS81/NMS83. | Details |
| XPN0036- | Main boardUsage: NRF81, NMR81/NMR84, NMS80/NMS81/NMS83. | Enquire |
| XPN0031- | I/O moduleUsage: NRF81, NMR81/NMR84, NMS80/NMS81/NMS83. | Enquire |
| 71067434 | Nameplate changeBlank. To fill in the new order code when a non Ex instrument has been modified. Usage: FMB50/FMB51/FMB52, FMR230/FMR231, FMR240/FMR244/FMR245, FMR250,FMR530/FMR532,FTL50/FTL50H/FTL51/ FTL51C/FTL51H, FTL70/FTL71, FTL80/FTL81/ FTL85, NMR81, PMC51, PMC71, PMP51/PMP55. | Details |
| XPRFID- | Spare RFID TAGConsists of: RFID TAG, fixing wire, crimp sleeve. | Enquire |
| 71285499 | SealDN50 PN10-16. Material: FKM. Usage: NMR81. | Details |
| 71285501 | SealDN80 PN10-40. Material: FKM. Usage: NMR81. | Details |
| 71285503 | SealASME 3" 150lbs / JIS 80A 10K. Material: FKM. Usage: NMR81. | Details |
| 71292751 | weather protection coverMaterial: 316L. Usage: NMR81/NMR84, NRF80/NRF81. | Details |
Configurator / Comparison
Case Studies
Municipal Wastewater Treatment · tank farm — Application Case
Application Context
the inlet, biological and outlet stages of a municipal plant is a typical Municipal Wastewater Treatment duty. The project started from tank farm, focusing on centralised level and inventory gauging across a tank farm.
Process Constraints
effluent parameters drift and probes foul with sludge and biofilm, and high solids and corrosive fractions, with large diurnal flow swings only amplify it. The tank farm specification must therefore cover choosing the gauging method by tank size, medium and safety class, then networking them together.
Delivery Approach
Delivery was handled as the level range — level solution matched to the actual tank and silo geometry. Execution centred on choosing the gauging method by tank size, medium and safety class, then networking them together, together with stable compliance with Grade 1A discharge limits and online data reporting.
Field Results
Operation shows the benefit clearly — real-time inventory, making stocktaking and loss accounting more accurate, with confidence in this measuring point improving markedly.
Food & Beverage · tank farm — Application Case
Customer Profile
The typical setting in Food & Beverage is dosing, pasteurising, filling and CIP stages. The measuring point is tank farm; the focus is centralised level and inventory gauging across a tank farm.
Key Difficulties
Conditions are syrups, dairy and beverages that scale easily, under strict hygienic requirements and, on top of that, frequent cleaning demands instruments that withstand hot CIP/SIP caustic cycles, which a standard configuration cannot handle for long. The design therefore starts with choosing the gauging method by tank size, medium and safety class, then networking them together.
Implementation
The scope ran through the level range: level solution matched to the actual tank and silo geometry. Technically it hinges on choosing the gauging method by tank size, medium and safety class, then networking them together, and on these requirements: food-safety and hygienic design per 3-A / EHEDG.
Customer Benefit
In practice this means real-time inventory, making stocktaking and loss accounting more accurate, which cut the workload on the site maintenance team.
Chemical & Pharmaceutical · tank farm — Application Case
Project Background
The project covers reactors, metering vessels and finished-product tanks. The work centres on tank farm and the core task is centralised level and inventory gauging across a tank farm.
Operating Challenges
The medium and duty are characterised by highly corrosive media with solvents and crystallisation, partly in explosive atmospheres, and corrosion plus Ex protection shortens instrument life and makes downtime costly. So tank farm cannot be specified generically — it calls for choosing the gauging method by tank size, medium and safety class, then networking them together.
Solution
The Ainstru engineering team worked through the level range: level solution matched to the actual tank and silo geometry. The configuration involves choosing the gauging method by tank size, medium and safety class, then networking them together, with these requirements in view: Ex certification and GMP traceability of records.
Results
Since start-up the system has run steadily; the practical result is real-time inventory, making stocktaking and loss accounting more accurate.
Power & Energy · tank farm — Application Case
Project Overview
The site is boiler feedwater, turbine condensate and FGD/DeNOx systems. The customer wanted tank farm properly configured on the existing plant, with the aim of centralised level and inventory gauging across a tank farm.
Technical Challenges
What actually causes trouble is high temperature and pressure with both steam and saline water, and drift under high temperature and pressure, with very costly unplanned outages. All of this means the tank farm configuration has to involve choosing the gauging method by tank size, medium and safety class, then networking them together.
Configuration
Supply and installation were organised through the level range: level solution matched to the actual tank and silo geometry. On site this meant choosing the gauging method by tank size, medium and safety class, then networking them together, checked line by line against: compliance with power-industry codes and unit availability targets.
Performance
After commissioning the outcome is real-time inventory, making stocktaking and loss accounting more accurate, and the readings are now used for process tuning.
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