Low Pressure Sight Glass Up to 35 bar MWP Type SG
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1 MAKING MODERN LIVING POSSIBLE Technical brochure Low Pressure Sight Glass Up to 35 bar MWP Type SG
2 Introduction Sight glasses are used to indicate:. The condition of the refrigerant in the liquid line of the plant. 2. The flow in the oil return line from the oil separator. 3. The moisture content in the refrigerant. The SG and SGR are mainly used to indicate the condition of the refrigerant as well as the liquid level in the receiver or the oil level in the compressor. The SGI/N and SGRI/N are equipped with sensitive indicators that reflects a colour, depending on the moisture content in the refrigerant. Available types Solder version SG: Without moisture indicator Socket SGR: Socket type without moisture indicator Flare verison Solder version Flare verison SGI: For mineral oil e.g. CFC and HCFC SGN: With HFC moisture indicator Socket Saddle SGRI: Saddle sight glass for mineral oil e.g. CFC and HCFC SGRN: Saddle sight glass with HFC moisture indicator Features Type SG / SGR Indicates lack of subcooling Indicates refrigerant deficiency Indicates liquid level in receiver Indicates oil level in compressor Flare-/solder connection or socket type Type SGI / SGRI For mineral oil e.g. CFC and HCFC Indicates too high water content in the refrigeration system Indicates lack of subcooling Indicates refrigerant deficiency Flare-/solder connection or socket type Type SGN / SGRN For HFC refrigerants Indicates too high water content in the refrigeration system Indicates lack of subcooling Indicates refrigerant deficiency Flare-/solder connection or socket type 2 DKRCC.PD.EK0.A5.02 / 520H5267 Danfoss A/S (AC-SMC / bpv), 03-20
3 Choice of sight glass Before choosing a sight glass with moisture indicator, the following should be considered: type of refrigerant water solubility of refrigerant the level on which a danger signal is required. Be aware that polyester oil for HFC refrigerants, e.g. R34a, R404A, R407C react with water in a hydrolysis generating acid and alcohol. The recoended levels of moisture content are usually between and 75 ppm, where hermetic compressors only tolerate very low moisture content, while semi-hermetic and other compressors normally tolerate higher moisture contents in the refrigerant. The on the sight glass indicator depends on the moisture content of the refrigerant. The values under green/ are to be considered as perfect condition meaning full protection against harmful effects from moisture. In other words, the filter drier is working perfectly. If the green starts to fade, the change has begun and the indicator should therefore be watched more carefully. If the changes to yellow it is a clear signal, that the capacity of the filter drier is exceeded and should be replaced as soon as possible. Technical data Ambient temperature 50 C +80 C Max. working pressure PS/MWP = 35 bar SGI / SGRI for mineral oil e.g. CFC and HCFC refrigerants Moisture content ppm = parts per million SGI/SGRI 25 C 43 C Mineral oil e.g. R < >0 < > 500 SGN / SGRN for HFC and HCFC refrigerants Moisture content ppm = parts per million SGN / SGRN 25 C 43 C R < - 20 >20 < > 200 R34a < - 00 >00 < >70 R404A < > 70 < >00 R407C < - 0 >0 < >5 R507 < > 60 < - 0 >0 Note: For moisture values of other refrigerants, please contact Danfoss. Danfoss A/S (AC-SMC / bpv), DKRCC.PD.EK0.A5.02 / 520H5267 3
4 Ordering Monitor Type Version Connection in. Connection Code no. SG 0 Flare ext. ext SG 2 SG 6 SGI 6 SGI 0 SGI 2 SGI 6 SGI 9 SGI 6 SGI 0 SGI 2 SGI 6 SGI 9 SGI 6s SGI 0s SGI 2s SGI 6s SGI 9s SGI s SGI 6s SGI 0s SGI 2s SGI 8s SGI 6s SGI 0s SGI 2s SGI 6s SGI s SGN 6 SGN 0 SGN 2 SGN 6 SGN 9 SGN 6 SGN 0 SGN 2 SGN 6 SGN 9 SGN 6s SGN 0s SGN 2s SGN 6s SGN 9s SGN s SGN s SGN 6s SGN 0s SGN 2s SGN 8s SGN 6s SGN 0s SGN 2s SGN 6s SGN s ) Can be screwed directly into the filter drier. Flare ext. ext. Flare int. ext. ) ODF ODM solder Flare ext. ext. Flare int. ext. ) ODF ODM solder Mineral oil e.g. CFC and HCFC / 8 7 / / 8 7 / 8 7 / 8 7 / 8 / 8 / / 8 7 / HFC DKRCC.PD.EK0.A5.02 / 520H5267 Danfoss A/S (AC-SMC / bpv), 03-20
5 Ordering (cont.) Type SGR ¾ SGR ¾ SGR ½ Version Pipe thread NPT NPT Connection 2 G¾ A ) ¾ NPT ½ NPT Socket type Code no SGRI SGRI SGRI SGRI for saddle ½ - NPT SGRN SGRN Sight glaas saddle Sight glaas saddle Sight glaas saddle SGRN SGRN for saddle ½ NPT 7 / 8 / 8 3 / 8 5 / 8 2 / 8 3 / 8 4 / SGRN SGRN for saddle M M / ) ISO 8/ Danfoss A/S (AC-SMC / bpv), DKRCC.PD.EK0.A5.02 / 520H5267 5
6 Dimensions and weights SGI / SGN flare, int. ext. SGI / SGN solder ODF ODF SGR SGI / SGN flare, ext. ext. SGI / SGN solder ODF ODM SGRI / N Type SGI/SGN 6 SGI/SGN 0 SGI/SGN 2 SGI/SGN 6 SGI/SGN 9 SGI/SGN 6 SGI/SGN 0 SGI/SGN 2 SGI/SGN 6 SGI/SGN 9 SGI/SGN 6s SGI/SGN 0s SGI/SGN 2s SGI/SGN 6s SGI/SGN 8s SGI/SGN s SGI/SGN s over size SGI/SGN 6s SGI/SGN 0s SGI/SGN 2s SGI/SGN 6s Version Flare ext. ext. Flare int. ext. ODF ODF solder ODF ODM solder L L SGR / 2 NPT 8 0. SGR 3 / 4 Pipe thread SGR 3 / 4 NPT SGRN / 2 NPT 8 0. H H B Ø D Weight kg Danfoss A/S (AC-SMC / bpv), DKRCC.PD.EK0.A5.02 / 520H5267 6
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