SGH/SGRH, sight glasses, R410A
SGH R410A specific sight glasses are used to indicate: the condition of the refrigerant in the plant liquid line and the moisture content in the refrigerant.
SGH sight glasses are fitted with a special R410A moisture indicator. For R410A, the indicator is green when moisture content is below 20 ppm (25°C) / 60 ppm (52°C) and yellow when moisture content is above 165 ppm (25°C) / 500 ppm (52°C).
