Because slurry tanks are by their nature turbulent environments, with an inevitable element of scale build up, non-contact measurement is the key. Ultrasonic transmitters are good solution provided there is not too much dust in the air space above the liquid level, such as in a slurry storage tank following a slaker. When there is potential for dust in the air and/or foam on the tank surface as would be the case in a Hydrated Lime makedown tank, we would recommend switching to a radar transmitter. Some customers (with strong preventative maintenance programs) have also had success with “bubbler” type level transmitters. For more information on how to reduce dust click here (q 7).