Castel liquid refrigerant sight glasses - indicators of air bubbles and humidity in the refrigerant in the refrigeration system. The transparent sight glass identifies whether the HVAC-R system is flowing with ...bubble refrigerant or refrigerant with air bubbles or impurities. In case of bubbles, the system must be recharged with freon, the filter drier must be changed or the condensation pressure must be checked. Liquid sight glasses with Castel weldable connection, with diameters of 6 ... 28 mm. The sight glasses are equipped with a humidity-sensitive element. The green/blue color on the liquid sight glass indicates a correct humidity level. The yellow/pink color signals the presence of a dangerous level of humidity in the system. Mai mult
