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Sensors for Water Level Monitoring | |
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| Level Sensor Variants | Water Level Sensors come in two main forms: contact and non contact. The primary form of contact sensors are the hydrostatic level sensors. These use a pressure sensor to measure the force exerted by the weight of water sitting above the sensor. Vented level sensors have a vent tube running from the back of the sensor out to atmosphere and thus report the pressure from the water column alone. This can be converted to an equivalent depth in m. Unvented sensors report the total pressure exerted by the water and the air above it. The reading must then be compensated for the effects of barometric pressure (subtract the barometric presure form the indicated reading) and then converted to a level in m. Non contact sensors are typically either ultrasonic or radar. They are most useful where sensors can not be installed in the water body - it may be dry part of the year or unsafe to install when full or debris may risk damaging the sensor. Ultrasonic sensors are cheap to build and have been around for many years. Radar level sensors have become popular through advances in radio technology at the very high frequencies (80 GHz) which is required for accurate level measurement. Radar level sensors provide superior performance but at a higher cost. |
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| GLT744 Radar Level Sensor | The GLT744 is a compact Radar Level sensor with a 3mm accuracy and a range of 15m. It has an RS485 / MODBUS interface and configuration and testing can be carried over its Bluetooth interface. The GLT744 operates in the freuqnecy range 76 to 82 GHz. It operates from a supply voltage of 14 to 28V and comes fitte dwith a 1.5m cable. View GLT744 Brochure. |
