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Help CenterDanfoss Sight Glass Types SGI6-10S,SGN12-16S,SGR22-28S
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Danfoss Sight glass types SGI6-10S,SGN12-16S,SGR22-28S introduction
SG is sight glasses for low pressure application(Max Working Pressure 500 psig). SG is available with flare, solder and socket connections, and with and without moisture indicators. SG and SGR, without moisture indicator, are
mainly used to indicate the condition of the refrigerant in the liquid line or the flow in the oil return line from the oil separator. SGI / SGN and SGRI / SGRN are equipped with sensitive indicators that reflects a color,
which depends on the moisture content in the refrigerant.
Danfoss Sight glass types SGI6-10S,SGN12-16S,SGR22-28S Features
• Provides fast and easy indication of:
– High system moisture content
– Lack of subcooling or low system charge
– Liquid level in receiver(vessel mount versions only)
• Oil level in compressor(vessel mount versions only)
• Two Indicator types:
– Type “I” – provides optimal moisture indication for refrigerants with mineral oil, e.g. R22
– Type “N” – provides optimal moisture indication for refrigerants: R22, R134a,R404A, R407C, R507, R407A, R407F, R448A,R449A, R450A, R452A, R513A
• All indicators are dirt resistant
• Available in both inline and vessel mount versions
• Hermetically sealed, tempered glass for easy viewing
• Available in flare / flare, solder / solder connection or socket type
Danfoss Sight glass types SGI6-10S,SGN12-16S,SGR22-28S Selection
Prior to selecting a sightglass with moisture
indicator, the following should be considered:
• Type of refrigerant
• Water solubility of refrigerant
• The level at which a danger signal is required
to prevent the formation of harmful acids
The following tables indicate moisture content
levels at which the sightglass indicator will
register a dry or wet system for various
refrigerants.
The values under “green / dry” are to be taken as
the maximum permissible moisture content for
the system. When the green color begins to fade
indicating an increase in moisture levels, the
sightglass should be checked more frequently.
If the moisture levels increase enough to change
the indicator to “yellow” indicating a wet system,
the filter drier must be changed immediately.
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