The SGI and SGN are fitted with an indicator which changes colour to show the moisture content in the refrigerant.
The SGR is used to indicate the liquid level in a receiver or the oil level in a compressor crankcase.
The SGRN is a sight glass like SGR, but supplied with a moisture indicator.
The moisture indicator in the sight glasses are dirt repelling.
Type SGN / SGRN
■ For HFC and HCFC refrigerants
■ Indicates too high water contents in the refrigeration system
■ Indication of lack of sub-cooling
■ Indication of refrigerant deficiency
■ Flare or solder connection
Type SGI
■ For HCFC and CFC refrigerants
■ Indicates too high water contents in the refrigeration system
■ Indication of lack of sub-cooling
■ Indication of refrigerant deficiency
■ Flare- or solder connection