Det-Tronics PIR9400A3A1AB

The PIR9400A3A1AB is the PointWatch PIR9400 diffusion infrared hydrocarbon gas detector from Det-Tronics. This PIR9400A3A1AB uses non-dispersive infrared NDIR sensing principle to measure LFL concentration of combustible hydrocarbon gases such as methane, propane and ethylene. It is immune to catalytic bead poisons, no routine calibration required, only annual functional test is recommended. The suffix A3A1AB defines gas type, enclosure material, output option, mounting thread and certification configuration for this specific variant.

This PIR9400A3A1AB runs on 24VDC supply, standard 4-20mA analog output for connection to gas controllers, DCS and PLC. It features continuous optical self-check, built-in fault diagnosis and local LED indicator for alarm and fault status. Heated sapphire optics and hydrophobic filter are available to prevent condensation and dust contamination in wet, offshore and coastal environments. It carries ATEX, IECEx, FM hazardous area approvals, IP66/67 stainless steel housing.

The PIR9400A3A1AB is widely deployed in refineries, oil & gas compressor stations, chemical plants and power plant gas turbine enclosures for flammable gas leakage monitoring. The PointWatch PIR9400 series is a mature IR gas detector platform. Many safety and EPC teams stock the PIR9400A3A1AB as spare transmitter for gas detection system overhaul and emergency replacement.