FMR54 Radar Tank Gauge

FMR54 Radar Tank Gauge

The FMR54 Radar Tank Gauge (RTG), with an accuracy rate of ±6 mm and ideally suited for inventory control applications, is used for continuous, non-contact level measurement in stilling wells and bulk liquid storage tanks.

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Accurately Measure Your Inventory

The FMR54 RTG uses 6 GHz band microwaves to measure liquids to an accuracy of ± 6 mm (0.24″). Changing process conditions inside your tank, such as temperature changes, gas blankets, pressures or vapors, have negligible effect on radar measurement.



Touch Screen Operations

Easy onsite operation using built-in touch control display without having to open the enclosure. A remote display is also available so that you can read and operate the gauge from the tank side.



Simple Device-to-Device Configuration

When setting up your system, the HistoROM module can be used to quickly transfer configuration settings from one gauge to the next. It can also be used to access historic data from device integrated memory.



Worldwide Approvals

Each radar gauge is approved for use in explosion hazardous areas to ATEX, FM, CSA, TIIS and IECEx standards. They are also SIL 2 and SIL 3 rated for overfill prevention.



Key Features

  • 2-wire technology: Reduces on tank wiring costs and allows easy implementation into existing systems.
  • Non-contact measurement: Tank top is almost independent from product properties.
  • Horn antenna: 6″ to 10″ (150-250 mm).
  • Planar antenna: 6″ to 12″ (150 to 300 mm).
  • Standard range up to 66 ft (20 m). Extended range up to 125 ft (38 m) using planar antenna in stilling well.
  • Easy onsite operation using built-in touch control display without opening enclosure (or optional push button display with cover removed).
  • Access historic data from device integrated memory (HistoROM) and transfer configuration setting from device to device.
  • Easy commissioning and diagnostics using Windows® based software. HART, PROFIBUS PA, or FOUNDATION Fieldbus protocols.
  • High temperatures: Suitable for process temperatures from -321 °F (-196 °C), up to 752 °F (400 °C) with high-temperature
  • High pressure: Suitable for pressures up to 2320 PSI (160 bar), depending upon antenna type and sealing material.
  • Approved for use in explosive hazardous locations.
  • Integrated over voltage protection.
  • SIL 2 approved for overspill protection system applications or SIL 3 for standalone applications.
  • Optional remote display (FHX50).
Maximum Measured Error

Standard Range Digital: ± 6 mm (0.24″) plus ±0.02 % of analog value

Power Consumption

min. 60 mW, max. 900 mW

Current Consumption

HART: 3.6 to 22 mA,
PROFIBUS PA: max. 14 mA
FOUNDATION Fieldbus: max. 15 mA


4 – 13.5 kg (10 – 30 lb) plus weight of flange


IP 66, NEMA 4X
(IP20, NEMA 1 with open housing)
Housing GT18: 316L, stainless steel
Housing GT19: plastic
Housing GT20: aluminium, seawater repellent, powder coated


IP 68 (NEMA 6P)

Conduit Entries

Cable gland: M20x1,5 (for EEx d: cable entry)
Cable entry: G ½ or ½ NPT
Fieldbus Foundation 7/8″ plug

Ambient Temperature

Unit: -40 °F and +176 °F (-40 °C and +80 °C)
Display: -4 °F and +158 °F (-20 °C and +70 °C)

Operating Frequency

C-band, Up to 8 devices can be installed in the same tank

Dielectric Constants

– er 1.9 in free-field applications
– er 1.4 in stilling well

See specifications document for more information.

Approvals & Certifications


Antenna & Seals

Various sizes and material types

Process Connections

Threaded, Tri-clamp, ISO, DN, RF, NIPS
Gas-tight feed through

Output Options

HART, PROFIBUS, and Foundation Fieldbus

Gland Entry

Metric, NPT, G


Over 20 national languages available

Contact Varec for more information.


Radar Gauge Comparison Guide
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Technical Specifications

FMR54 Radar Tank Gauge Technical Specifications
Technical specifications for the FMR54 Radar Tank Gauge.

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Application Checklists

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


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FMR54 Radar Tank Gauge Manual
Please visit the Endress and Hauser website to access the parts and accessories information for the FMR54 Radar Gauge.
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