Danfoss SG, SGI, SGN, SGR, SGRI Data sheet

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Data sheet

Sight glass (Low pressure) Types SG, SGI, SGN, SGR, SGRI and SGRN

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.

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

DKRCC.PD.EK0.B4.22 | 1

Data sheet | Sight Glass, Types SG, SGI, SGN, SGR, SGRI and SGRN

Approvals

Technical data

Media temperature -58 – 175 °F

Maximum working pressure PS / MWP = 500 psig

Refrigerant oil All mineral oils and ester oils

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

Note: when storing, transporting

or installing the Sight Glass, avoid the chemical indicator to get in contact with non-refrigerant medium or ﬂuid (like water, oil, ect.)

SGI / SGRI for refrigerants with mineral oil

Media temperature 77 °F Media temperature 110 °F

Green / dry Intermed. color Yellow / wet Green / dry Intermed. color Yellow / wet

Refrigerants with mineral oil, e.g. R22

< 150 150 – 300 > 300 < 250 250 – 500 > 500

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.

Moisture content ppm = parts per million

SGI / SGRI

SGN / SGRN for R22, R134a, R404A, R407C, R507, R407A, R407F, R448A, R449A, R450A, R452A, R513A

Moisture content ppm = parts per million

SGN / SGRN

Media temperature 77 °F Media temperature 110 °F

Green / dry Intermed. color Yellow / wet Green / dry Intermed. color Yellow / wet

R22 < 30 30 – 120 > 120 < 50 50 – 200 > 200

R134a < 30 30 – 100 > 100 < 45 45 – 170 > 170

R404A < 20 20 – 70 > 70 < 25 25 – 100 > 100

R407C < 30 30 – 140 > 140 < 60 60 – 225 > 225

R507 < 15 15 – 60 > 60 < 30 30 – 110 > 110

R407A < 29 29 – 115 > 115 < 48 48 – 192 > 192

R407F < 30 30 – 168 >168 < 60 60 – 240 > 240

R448A < 28 28 – 110 > 110 < 70 70 – 227 > 227

R449A < 29 29 – 105 > 105 < 53 53 – 200 > 200

R450A < 23 23 – 148 > 148 < 46 46 – 245 > 245

R452A < 20 20 – 79 > 79 < 30 30 – 143 > 143

R513A < 22 22 – 75 > 75 < 22 22 – 123 > 123

Notes:

– For colours reﬂecting moisture values of other refrigerants, please contact Danfoss – For a fully updated list of approved refrigerants, visit www.products.danfoss.com and search for

individual code numbers, where refrigerants are listed as part of product speciﬁcations.

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