*FMR530 Radar Tank Gauge

*FMR530 Radar Tank Gauge

The FMR530 Radar Tank Gauge (RTG), with an accuracy rate of ±0.5 mm and ideally suited for custody transfer applications, is used for continuous, non-contact level measurement in bulk liquid storage tanks. The FMR530 RTG with horn antenna is suitable for free space applications that disallow the use of a parabolic antenna due to tank/nozzle geometry.


NOTE: This product is approaching its end-of-life status. Please contact sales or your local rep for current inventory availability for new units and/or spare parts. 

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Accuracy Approved for Custody Transfer

FMR530 RTG uses C (6 GHz) band microwaves to measure liquids to an accuracy of ±0.5mm (0.02″) This gauge is NMI and PTB approved for use in custody transfer tank gauging systems.



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.


Communication Diagram Fmr530


Low Cost Wiring

Intrinsically safe 4-wire technology reduces on-tank wiring costs and allows easy implementation into existing systems.


Worldwide Approvals

Each radar gauge is approved for use in explosion hazardous areas to FM, CSA and ATEX standards.


Key Features

  • Cost‐effective intrinsically safe — 4‐wire cable for HART and 24 VDC i.s. power.
  • Easy on‐site operation using built‐in display.
  • Easy commissioning and diagnostics using Windows® based software.
  • Inventory control version with available (±3 mm) accuracy.
  • National approvals (NMi, PTB) for custody transfer.

Maximum Measured Error

Free space: ±0.5 mm
Stilling well: ±0.8mm

Power Consumption

Max. 330 mW at 16 V, Max. 500 mW at 24 V,
Max. 600 mW at 30 V

Current Consumption

Max. 21 mA (50 mA inrush current)


7.1 kg (15 lb 7 oz) plus weight of the flange


IP 65, NEMA 4X (IP20, NEMA 1 with open housing and removed liquid crystal display) Housing T12: aluminium, seawater repellent, chromate, powder coated


IP 68 (NEMA 6P)

Conduit entires

Cable gland: M20x1.5; Pg 13.5 (gland included) 3/4 NPT: G 3/4 internal thread

Ambient Temperature

‐40°F and +185 °F (‐40 °C and +5 °C)


ATEX approval
RF approvals ‐ R&TTE, FCC
Marine certificate ‐ GL (Germanisch Lloyd), ABS, NK
Factory Mutual ‐ IS Class I,II,III, Div 1 Groups A‐G T*
Class 1, Zone 0, AEx ia IIC T*
DIP Class II,III, Div 1 Groups E,F,G T*
NI Class I, Div 2 Groups A‐D T*
XP‐IS Class 1, Div. 1 Groups A‐D T*
XP Class 1, Zone 0, IIC T*
Antenna Class 1, Zone 0, AEx ia IIC T*
CSA ‐ ExnC IIC Class 1 Zone 2, Exd [ia] IIC Zone 1/0, Ex ia IIC Class 1 Zone 0

See specifications document for more information.

Approvals & Certifications



Various Sizes and Material Types

Process Connections


Output Options


Gland Entry

Metric, NPT, G


NMi + PTB (<1mm) Custody Transfer, or Inventory Control Version (3mm)

Contact Varec for more information.


Inventory Control Solutions
Integrate Field Instruments and Software for Complete Asset Management
Advanced Tank Gauging
High Accuracy Inventory Management and Custody Transfer Applications

Parts and Accessories

Radar Tank Gauging Checklist
Checklist for Radar Tank Gauging needs.
Temperature Tank Gauging Checklist
Checklist for Temperature Tank Gauging needs.
FMR530 Radar Gauge Parts and Accessories
Please visit the Endress and Hauser website to access the parts and accessories information for the FMR530 Radar Gauge.

White Paper

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FMR530 Radar Gauge Technical Manual
Please visit the Endress and Hauser website to access the technical manual and operating instructions for the FMR530 Radar Gauge.

Technical Specifications

FMR530 Series Radar Tank Gauges Technical Specifications
Technical specifications for the model FMR530 Radar Tank Gauge.