p | Sensors | OEM Sensor Applications Smart Gas Sensor PYM 151 / PYM 152 Sensor Modules for Natural Gas Detection Dimensions in mm Patend pending Meets EN 50 194 Requirements Unique NDiR Sensor Module Digital Output Factory-calibrated New! The Smart Gas Sensor is PerkinElmer’s response to OEM requirements for gas alarm sensors with long term stability. By use of the NDIR principle with a robust IR source and and a highly reliable pyroelectric detector, this sensor offers a digital alarm o.