The FS4NDIR/R290 Industrial Infrared Propane (Refrigerant) Sensor utilizes proprietary light-cell-free NDIR technology and features a robust aluminum alloy casing with digital output.It is engineered to resist interference from other gases eliminating the need for pump pipelines.Compact in size, corrosion-resistant,and easy to maintain,this sensor is ideal for applications such as leak alarms, environmental monitoring,online monitoring, and gas composition analysis.