Danfoss gas detecting sensor program, type GD is a range of products designed to meet all industrial refrigeration and air conditioning applications. GD detects a wide range of commonly used refrigerants including Ammonia, Carbon Dioxide, Halocarbons and Hydrocarbons. GD sensors incorporate an interchangeable precalibrated sensor board, which makes it very easy to replace the sensor when service or calibration is required. The GD products feature reliable, real time continuous monitoring. No blocked filters, tubes or technical / maintenance problems experienced by air sampling/aspirated systems.