Level Sensors & Switches

RLI-G Guided Wave Radar Level Sensor

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RLI-G Guided Wave Radar Level Sensor is a no-moving parts continuous level sensor with advanced radar level sensing technology for reliable performance in challenging marine and industrial tank level applications. The RLI-G Series Guided Wave Radar comes standard with 4-20 mA and HART output as well as an LCD display module and multiple sensing probe and mounting options. These flexible guided wave radar sensors self-configure to medial dielectric constant and include and LCD display module and plug-in module to assist in programming and displaying measured values in numerical and bar graph form. Available with multiple sensing probe and mounting options, the RLI-G Guided Wave Radar level sensors can be incorporated into a vast range of applications.


30 - 45 days
Lead-times and expedites

Lead-times apply to standard parts & configurations. Expedited shipments available by contacting factory. Lead-times may vary based on quantity and/or non-standard configurations.

CE ROHS Gems Compliant CSA


  • Measuring range up to 24m (80 feet)
  • Accuracy: +/- 5mm (0.2 inch)
  • Measurement independent of temperature pressure & density variations
  • Product options to sense dielectrics as low as 1.4
  • 4-20 mA + HART Output
  •  Segmented options for single rod and coaxial designs
Sensor Type
Guided Wave Radar Level Sensor
24m (80 feet)
±5mm (0.2 inch) 
Supply Voltage
18V - 35 VDC 
Signal Output
4-20mA + HART
Minimum Process Temperature
Maximum Process Temperature
580 psi max
Electrical Connection
Process Connection

RLI-G Product Software

Format .zip
Size 9 MB

Gems Sensors Set-Up Guide, RLI-G

Format .pdf
Size 1 MB

Gems Sensors Instructions, RLI-G

Format .pdf
Size 568 KB

RLI-G Product Guide

Format .pdf
Size 312 KB

Gems Sensors Catalog, RLI-G

Format .pdf
Size 1 MB
  • General Industry
  • General Industry - Environmental
  • General Industry - Fire Suppression
  • General Industry - Fountains
  • General Industry - Other
  • General Industry - Tanks
  • General Industry - Tanks - Specialty Chem
  • HVAC/R - Cooling Towers
  • HVAC/R - Evaporators
  • HVAC/R - General HVAC
  • HVAC/R - Other
  • HVAC/R Equipment
  • Marine - Commercial - Aftermarket
  • Marine - Commercial - Container Ships
  • Marine - Commercial - Cruise Ships
  • Marine - Commercial - Other
  • Marine - Commercial - Pleasure Craft
  • Marine - Commercial - Repair Yard
  • Marine - Commercial - Ship Owner
  • Marine - Commercial - Ship Systems
  • Marine - Commercial - Shipbuilder
  • Marine - Commercial - Workboats
  • Marine - Commercial - Yachts
  • Marine - Govt & Military - Homeland Security
  • Marine - Govt & Military - Marine
  • Marine - Govt & Military - Marine - Other
  • Marine - Govt & Military - Military
  • Marine - Govt & Military - US Government
  • Marine Vessels
  • Oil & Gas - Exploration
  • Oil & Gas - Mud
  • Oil & Gas - Offshore Platforms
  • Oil & Gas - Other
  • Oil & Gas - Storage Tanks
  • Oil & Gas Equipment
  • Process Applications
  • Process Industry - Chemical
  • Process Industry - Other
  • Process Industry - Process Tanks
  • Process Industry - Processing
  • Process Industry - Pulp & Paper
  • Process Industry - Textiles
  • Process Tanks
  • Storage Tanks
  • Waster Water Applications
  • Water & Waste Water - Flood Level Monitoring
  • Water & Waste Water - Groundwater Monitoring
  • Water & Waste Water - Industrial Water Treatment
  • Water & Waste Water - Other
  • Water & Waste Water - Water Distribution
How is this product different from what Gems offers today?

No moving parts Can handle liquid dielectric as low as 1.4 Self-configures to media dielectric constant HART protocol comes standard with the 4-20 mA Output

What is the maximum measuring range?

The RLI-G can measure tanks up to 80 feet (24m). Sensing depth is dependent upon options selected.

What is the difference between Guided Wave Radar and Pulse/Free-Air Radar?

Guided Wave Radar, or GWR, transmits its signal via a cable or solid rod down into the tank/vessel. The cable or rod contacts the media. On Pulse or Free-Air Radar units, the sensor does not contact the media and its signal is transmitted down through the air space above the media.

How do I set-up my RLI-G transmitter?

To set-up your Radar Level Transmitter properly, be sure to download the Quick Set-up Guide and follow the instructions step by step.

How close to the bottom and/or the side wall of my tank can I measure?

Each RLI-G probe type has unique dimensional requirements. Please consult the RLI-G catalog pages for the specifics on your desired probe type.