External hydrogen sensor for the warning devices GX-A1+ or GX-HS, detects hydrogen from leaking fittings in air conditioning and heat pump systems. High selectivity for hydrogen, small size, and low power consumption. Utilizes a simple circuit. The gas sensor GX-H2 is a hydrogen sensor and is used as an accessory for the GX gas warning devices in our product range. The sensor operates in dry rooms and must not be used in explosive environments. External sensor for the gas warning devices GX-A1 and GX-HS. Detection of R22, R32, R404a, R407c, R410a, R1234yf. Climate fluorocarbons are fluorinated refrigerants for air conditioning and cooling devices. The external sensor is compatible with the gas warning devices GX-A1 and GX-HS and is connected via an RJ connector on the cable. The sensor's connection line can be extended. The following minimum cross-sections apply depending on the length of the cable: Cable cross-section 3 x 0.75 mm²: maximum length 10 m, Cable cross-section 3 x 1.5 mm²: maximum length 20 m. For your information: Frequent and high gas concentrations will gradually reduce the sensor's sensitivity and lifespan. Never expose the sensor to pure refrigerant gas!.