The Radar level transmitter is known well for the accuracy and low maintenance it offers to the users. In the metal industry, molten metal furnaces have high temperatures and gases which call for special level measurement technology. Ultrasonic level transmitter fails to work here due to conditions unfavourable to their operations. Also, the presence of gases and foam disrupts the ultrasound waves and the readings are misleading and inaccurate. On the other hand, other level measurement technologies like float switches have a high maintenance cost as they need to be replaced frequently. Since radar level transmitters use radio waves or electromagnetic waves, they are independent of external factors such as gases, pressure, high temperatures, and material of the furnace.
Radar level transmitter uses radio waves or electromagnetic waves to send signals and receive the echo back to measure the level of the liquid, solid, molten metals, or any substance for that matter. Since electromagnetic waves are not affected by the medium and instead work on the speed of light, they are more robust, versatile, and accurate in terms of operations. The operation of a radar level transmitter is similar to that of an ultrasonic level transmitter. However, it has a radio wave module, an antenna, and a gauging setup. The gauging setup basically comprises of high temperature gauging system. The high temperature level measurements are done using the non-contact or Frequency Modulated Continuous Wave method. Another alternative Radar level transmitter method is the contact-based or Guided Wave Method. This method is not apt for molten metals as the high temperature level transmitter is damaged due to coming in direct with the liquid surface.