The AirScan iR Sensor responds to refrigerants over the range of 0-1,000 ppm and features SensorCheck technology that continually monitors sensor performance.The AirScan iR Sensor is an affordable microprocessor-based sensor that is selective to refrigerants and, because of its stabilised design platform, will provide years of service and will maintain the highest level of accuracy and reliability. This highly versatile sensor features SensorCheck, a unique technology that continuously monitors sensor performance that enables it to provide worry-free performance throughout the life of the sensor.