Danfoss GD replacement sensor cartridge, code 148H6201, a field-replaceable electrochemical sensing head for Danfoss GD gas detection units monitoring ammonia (R717). Factory-calibrated 0–300 ppm cartridge with a polycarbonate housing; alarm set points 25/150 ppm. Plugs into the installed GD unit base so a sensor at end of life is renewed without replacing the whole detector or rewiring. Ships with a calibration certificate. Compatible across the GD unit versions. Operating temperature -30 to +50 °C. CE and UL marked. HS 9027.90. OEM P/N 148H6201.