It features a low power design that installs in minutes, says the vendor, and incorporates heated optics to eliminate condensation, as well as a dirty optics indicator for fail-safe operation. The IR400 continuously monitors combustible gases in the lower explosive limit (LEL) range and provides a 4-20mA analog signal proportional to the 0 to 100% LEL concentration. The detector also monitors other conditions such as supply voltage and optical path integrity. The IR400 comes with the following industry approvals: FM, CSA, ATEX, CE Marking and IECEx. It is also certified as SIL 2 capable. Configurations with analog output, Modbus and Hart are available.General Monitorswww.generalmonitors.com800.330.9161