The EX-5165 sensor/transmitter from Enmet Corporation features an infrared sensor which can be supplied calibrated for the detection of carbon dioxide in ranges available from 0-500 ppm to 0-100 per cent by volume CO2. The NDIR sensor can continuously monitor high concentrations of CO2 and operate in an anaerobic environment, the company said. This sensor/transmitter provides an LCD of the gas concentration and has three LED alarm point indicators. It is approved for location in Class I, Division 1, Groups B, C and D atmospheres. It features 4-20 mA output and non-intrusive calibration. The EX-5165 is a 24 VDC loop powered transmitter that provides a 4-20 mA output which can be connected to a PLC or any one of several controllers available from ENMET Corporation.