A versatile sampling system for detection at a Particular Point or location Can be installed in hazardous area. Continuous monitoring with immediate response. Long lasting electrochemical sensor. Record output 4 to 20 MA. Easy maintenance and calibration. Optional battery backup. Wall or panel mounted or portable model also available. Alarm set point can be set to any range from 0 to full. Three different gas sensors or same can be used. Direct Digital read out in PPM