RLS Level Sensor


The RLS is a two-wire level transmitter operating with 6 GHz radar pulses for measurement ranges up to 20 m. It lends itself to the continuous monitoring of liquids and sludge in non-pressurised storage tanks in normal environmental conditions. The RLS is suitable for applications with chemical vapours, temperature gradients, vacuum or pressure, for example in tank farms, in storing chemical substances, in digestion towers or in sludge tanks. ETG RLS has a measurement range from 0.3
up to 20 m. The design of the RLS offers simple programming with the intrinsic security hand-held programming device, also without opening the cover of the instrument in the Ex area. The rod antenna in polypropylene offers high chemical resistance and is made as a single watertight piece. It has an integrated internal shield that eliminates disturbances coming from the assembly structure. The high signal/noise ratio of the RLS guarantees optimum reliability. The level measurement contains level switches and protection against overflow, empty signalling and protection against dry operation.

The instrument uses radar technology to measure the hydrometric level of the waterway, taking a measurement of the distance of the water surface from the sensor case and then subtracting the value found from the hydrometric zero value. An antenna system radiates very short microwave pulse on the surface of the water that will be reflected and again picked up by the antenna system. The pulses propagate at the speed of light and the round trip time from emission to reception of the signal is proportional to the liquid level. The high signal/noise ratio leads to greater measurement reliability.
It is built in propylene with outstanding chemical resistance in addition to being hermetically sealed.

- Principle of measurement:
Radar technology is not influenced by temperature, pressure, steam or dust. This characteristic makes them better and superior in performance compared to their ultrasonic competitors.
- Easy maintenance:
the benefits that our radar hydrometric sensor offers are not limited to precision, but also include simple and quick maintenance due to the engineering of the sensor that simplifies the measurement phases. The only preventive activity consists of controlling the levelling of the sensor and in cleaning the target struck by the sensor. In fact, there must be no obstacles between the emitter of the sensor and the free surface of the water.
- Sturdy and reliable construction:
It makes it an instrument with a long lifetime, which safeguards the customer’s investment. The instrument does not drift due to aging and requires no periodic calibrations. It is built in propylene with outstanding chemical resistance in addition to being hermetically sealed.

a. Recommendations
• Ambient temperature falling between –40°C and 80°C
• Access for programming via local display

b. Precautions
• Avoid proximity with high voltage cables, high voltage contacts and variable frequency motors
• Avoid obstacles near the emission cone
• Avoid installation near walls and interferences of indirect echoes

Hand-held programming device with intrinsic safety, even without opening the cover of the instrument in the area.

Range of measurement: 0-20 m
Accuracy: 0,1% span
Electrical output: 4-20 mA
Operative temperature: -40°C... +80°C
Material: Polypropylene antenna and rod

Monitored Parameters:

  • Water levels
  • Hazards:

  • Coastal flooding
  • Land and river flooding
  • Sea level rise
  • ✓ Relevant to the EWSS


    Minimum Quantity : 1


    Sensor Properties
    Accuracy (error of the measurements) Unit of measurement Data Refresh Time (mins) Wi-Fi Connection 4G Connection External Power Supply Documentation
    0,1% span m None False False True See available docs for RLS Level Sensor
    Reference Partners Project Name Project Year Reference Paper Minimum Purchase Spatial Density
    MBI srl None Not available 1 None
    Purchase operations complexity Assembly/Calibration Operations Complexity Deployment operation Complexity Deployment Cost Data Analysis Operations Complexity
    Easy Neutral Low Easy
    Citizen Science Activities Complexity Assembly Public Involvement Deployment Public Involvement Data analysis Public Involvement Target Users
    Neutral Limited Limited Limited Local groups; local authorities

    Additional pictures

    RLS Level Sensor currently, does not have any additional pictures