NRF81 Tankside Monitor

NRF81 Tankside Monitor

The NRF81 Tankside Monitor (TSM) is used in combination with Varec radar gauges for bulk storage applications at tank farms, terminals and refineries. It is designed to integrate and collect tank gauging data and provide detailed information for storage and process applications.

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Operational Process

4-Wire Communication Diagram for Radar GaugesThe NRF81 TSM is typically installed at the bottom of the tank for ease of access and allows access to all connected tank sensors. collects the measured values and performs several configurable tank calculations. All measured and calculated values can be displayed at the on-site display. Also, through a field communication protocol, the NRF81 TSM can transfer the values to an inventory control system like FuelsManager.



Easy to Read, Safe and Simple to Operate

Mounted within a flameproof enclosure,the NRF81 TSM has a Liquid Crystal Display (LCD) with touch control that ensures safe operation even in hazardous areas.



Versatile Tank Gauging

In addition to connecting to the primary radar tank gauge, the NRF81 TSM also integrates  HART® compatible devices using intrinsically safe connections, such as temperature and pressure transmitters for hybrid and hydrostatic (mass) applications.



Accurate Results

The NRF81 TSM fulfills the exacting demands of tank inventory management, inventory control, custody transfer, loss control, total cost saving, and safe operation. For volume calculation it will accept an input from either an average temperature probe 453x ATC series of temperature devices (via twisted pair cables, HART protocol) or via spot temperature element (via 2/3/4-wire RTD signal).



Worldwide Approvals

The NRF81 TSM is approved for use in explosion hazardous areas to ATEX, FM and IECEx standards.


Key Features

  • SIL2 certified (Min, Max, Continuous level)
  • Up to 6 SIL relay outputs
  • Wide range of output signals including V1, MODBUS RS-485, HART protocol
  • Interfaces to FuelsManager via the 8130 Remote Terminal Unit or 8300 series TankGate
  • Integration of HART instrumentation for temperature, water level,pressure, and overfill prevention sensor
  • Robust IP66/68, NEMA Type 4x/6P enclosure
  • Intrinsically safe power supply and communication for FMR53x radar level devices
  • Approved for use in explosion-hazardous areas
  • User-friendly operating menu (multi-lingual)
  • Provides communication to PLC, DCS, and SCADA systems
  • Weights & Measure-approved for use in custody transfer applications
Primary Outputs
  •  MODBUS RS485
  •  V1
  •  4-20mA HART Ex d/XP, RTD input
  •  4-20mA HART Ex i/IS, RTD input
Net Weight

12 kg (26 lbs) for housing plus electronics

Enclosure Materials
  • Electrical compartment: aluminium (AC 43000 T6) or stainless steel (316L)
  • Window: glass
  • Rated IP66/68, NEMA Type 4x/6P enclosure
Cable Specs
  • Standard device cable for the power line
  • HART communication line: Standard device cable only if analog, otherwise shielded cable
  • MODBUS communication line: Shielded cable
  • V1 communication line: Twisted pair screened or unscreened cable
  • High voltage type: 85 to 264 VAC, 50/ 60 Hz, 28.8 VA
  • Low voltage type: 52 to 75 VAC, 50/60 Hz, 21.6 VA
    19 to 64 VDC, 13.4 W
  • Bus inputs are electrically isolated from the other electronics

Storage: -50 to +80° C (-58 to +176° F)

Ambient: Device: -40 to +60° C (-40 to +140° F) /  Display Module: -20 to +70° C (-4 to
+158° F)



For complete technical specifications, download the technical document or product manual.

  • ATEX II 2(1)G Ex db[ia Ga] IIC T6 Gb
  • FM C/US XP-AIS Cl.I Div. 1 Gr. BCD T6 AEx d[ia] IIC T6
  • IEC Ex db[ia Ga] IIC T6 Gb
  • SIL

Primart Output:

  • Modbus RS485
  • V1
  • 4-20mA HART Ex d/XP, RTD input
  • 4-20mA HART Ex i/IS, RTD input

Secondary I/O Analogue:

  • Ex d/XP, 1x 4-20mA HART, 1x RTD input
  • Ex d/XP, 2x 4-20mA HART, 2x RTD input
  • Ex i/IS, 1x 4-20mA HART, 1x RTD input
  • Ex i/IS, 2x 4-20mA HART, 2x RTD input
  • 1x Ex i/IS 4-20mA HART, 2x RTD input + 1x Ex d/XP 4-20mA HART

Secondary I/O Digital Ex D/XP:

  • 2x relay / 2x module discrete
  • 4x relay / 4x module discrete
  • 6x relay / 6x module discrete
  • Modbus RS485


  • Thread M20, IP66/68 NEMA Type 4X/6P Encl.
  • Thread M25, IP66/68 NEMA Type 4X/6P Encl.
  • Thread G1/2, IP66/68 NEMA Type 4X/6P Encl.
  • Thread G3/4, IP66/68 NEMA Type 4X/6P Encl.
  • Thread NPT1/2, IP66/68 NEMA Type 4X/6P Encl.
  • Thread NPT3/4, IP66/68 NEMA Type 4X/6P Encl
  • English
  • German
  • Japanese
  • 50mm/2″
  • 80mm/3″
  • 100mm/4″, align. device

Transmitter Aluminum, coated

Application Checklists

Radar Tank Gauging Checklist
Checklist for Radar Tank Gauging needs.
Temperature Tank Gauging Checklist
Checklist for Temperature Tank Gauging needs.

Technical Specifications

NRF81 Tankside Monitor Technical Specifications
Technical specifications for the NRF81 Tankside Monitor.


Inventory Control Solutions
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Advanced Tank Gauging
High Accuracy Inventory Management and Custody Transfer Applications
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