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The General Monitors Model TS420 is a toxic gas sensor that continuously monitors for oxygen deficiency and provides an analog output signal. The TS420 utilizes electrochemical cell technology to detect oxygen deficiency in % by volume. The TS420Qs electronics are encapsulated within a chemically resistant plastic housing with detector information processed at the point of detection. The loop powered TS420 provides 4-20mA output signal proportional to 0 to 25% by volume oxygen at the detector. Another feature of the TS420 is the LCD indicator which provides status, fault and calibration cues. The TS420 Oxygen Deficiency Detector can be used in General Purpose, Intrinsically Safe, Increased Safety or Explosion-proof areas (when used with the appropriate accessories).