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 dryer filter must be changed or the condensation pressure must be checked. Castel and Sanhua liquid sight glasses 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 humidity level in the system. Mai mult
