Sight glass is used to indicate: 1.The condition of the plant liquid line; 2.The moisture content in the refrigerant; 3.The flow in the oil return line from the oil separator. It is fitted with an indicator which changes color to show the moisture content in the refrigerant, the moisture indicators in the sight glasses are dirt repelling.
♦ Indicates too high water contents in the refrigeration system
♦ Indication of lack of sub-cooling
♦ Indication of refrigerant deficiency
♦ Flare or solder connection
♦ For CFC HCFC and HFC refrigerants