Radar Technology Information



Everyone has heard of radar before, whether that be used for ships to help in navigation and collision avoidance or when watching your local TV news channel report on the weather with their Doppler Radar equipment.  Radar sensors are now even being used to help create self-driving cars!  Well Gems Sensors uses similar radar technology in our Liquid Level sensors.




Radar’s Measuring Principle:  Radar technology works by sending out short microwave signals toward the liquid via the sensor.  The microwave signal then hits the liquid surface and bounces back toward the sensor.  The sensor utilizes the time-of-flight principle which uses the known speed of the microwave, and the time it took for the signal to return, divided by two (since it had to travel down to the liquid and then back up to the sensor) to determine the distance between the liquid level and the sensor.  Since most level is based on the height of the liquid, not the height of the non-liquid (air), the air height is subtracted from the total tank depth to determine the liquid level!   


Advantages of Radar:  There are many advantages of radar technology over other level sensing technologies.  Through the air radar is a non-contact solution, whereas the liquid does not come in contact with any of the sensor's components.  This eliminates the need to worry about ensuring the sensor equipment is chemically compatible with the liquid.  No more worrying about sourcing sensors comprised of expensive alloys or worrying about replacing them due to corrosion.  In addition, this non-contact is of course a no moving parts solution, which eliminates any mechanical failures you may have from a float-based sensor.  Thus, no issues worrying about debris in the liquid that may foul up a contact based sensor or more viscous liquids coating the sensors causing failures.   

Radar is also advantageous because it has a particularly high measurement accuracy down to 5mm. The measurement is not affected by changes in the liquid’s properties or fluctuations in the process conditions such as temperature, pressure, or dust.  The ability to configure the sensor with Bluetooth ensures a user-friendly experience without the need to fill and empty the tank, saving time and maintenance.  


Common Applications for Radar:  Gems radar sensor can be used in countless non-contact level measurement applications of liquids and bulk solids.  With the ability to measure in tanks as small as 1 foot and also measure in tanks up to 49 feet, the applications are limitless!  Gems non-contact radar sensor has the capability to measure all kinds of liquids, even under high pressure and extreme temperatures, including solvents as well as aggressive liquids.  In addition, since this is a non-contact solutionGems Radar level sensor is constructed of PVDF making it suitable for use in applications with strict hygiene requirements. Gems radar level transmitter can not only measure liquids but also bulk solids with absolute reliability.  And unlike ultrasonic technology, radar technology operates even if there is dust or high condensation.  


Review Gems’ Radar Level Sensor for more information.