Model 5100-28 Combustible IR Gas Sensor Module Source: Sierra Monitor Corporation The new Model 5100-28 Combustible IR Gas Sensor Module utilizes Infrared technology to monitor for combustible gases over the range of 0-100% LEL The new Model 5100-28 Combustible IR Gas Sensor Module utilizes Infrared technology to monitor for combustible gases over the range of 0-100% LEL. The Model 5100-28 is the latest addition to the Sentry Gas Risk Management System that provides a comprehensive proactive means to monitoring for hazardous gases. The rugged IR Combustibles Gas Sensor Module requires minimal maintenance with a calibration check once a year. An integrated weather-shield and