The AKS 4100/4100U liquid level sensor is designed specifically to measure liquid levels in a wide range of refrigeration applications. The AKS 4100/4100U liquid level sensor is based on a proven technology called Time Domain Reflectometry (TDR) or Guided Microwave. AKS 4100/4100U can be used to measure the liquid level of many different refrigerants in vessels, accumulators, receivers, standpipes, etc. The electrical output is a 2-wired, loop powered 4 – 20 mA output signal, which is proportional to the refrigerant liquid level.AKS 4100/4100U in a cable version is suitable for HCFC, Nonflammable HFC and R717 (Ammonia), and differing lengths from 800 mm / 31.5 in. and up to 5000 mm / 197 in.The AKS 4100/4100U coaxial version should always be used for marine applications for all refrigerant types. Dust, foam, vapor, agitated surfaces, boiling surfaces, changes in density or in the dielectric constant (εr) for the liquid have no influence onthe AKS 4100/4100U performance.