Model SG Sight Glass

  • Product Description

  • Product Model

  • Technical Parameters

  • Product Description:

    ·Both Model SGN sight glass and Model SGS sight glass are used on the liquid piping of the refrigeration and air conditioning unit to indicate the flow condition of the refrigerant, water cut of the refrigerant and lubricant oil flow condition of the oil return piping on the oil separator.

    ·Model SGN sight glass and Model SGS sight glass are equipped with one moisture indicator, which will change color to indicate the water cut in the refrigerant.

    ·Model SGR sight glass is used to indicate the level of the refrigerant in the liquid drum and the lubricant oil level in the compressor crankcase.

    ·The modified PTFE sealing is used in bothModel SGN sight glass and Model SGR sight glass, which is applicable to various refrigerants and oils with perfect sealing performance. The structure of both Model SGN sight glass and Model SGR sight glass is an explosion-proof press fit and the viewing glass is clear and safety.

    ·Model SGS sight glass is an independent body structure with conventional sintered glass and O-ring seal.

  • Product Model:

    Model of Welded Connection Size Model of Threaded Connection Size
    SGN-1/4 ODF SGN-1/4 ODF 1/4(Φ6) SGS-1/4 SAE SGS-1/4 SAE 1/4(Φ6)
    SGN-3/8 ODF SGN-3/8 ODF 3/8(Φ10) SGS-3/8 SAE SGS-3/8 SAE 3/8(Φ10)
    SGN-1/2 ODF SGN-1/2 ODF 1/2(Φ12) SGS-1/2 SAE SGS-1/2 SAE 1/2(Φ12)
    SGN-5/8 ODF SGN-5/8 ODF 5/8(Φ16) SGS-5/8 SAE SGS-5/8 SAE 5/8(Φ16)
    SGN-3/4 ODF SGN-3/4 ODF 3/4(Φ19) SGS-3/4 SAE SGS-3/4 SAE 3/4(Φ19)
    SGN-78 ODF SGN-78 ODF 7/8(Φ22) SGR-3/4NPT 3/4NPT
    —— —— —— SGR-G3/4 G3/4


  • Technical Parameters:

    Applicable Refrigerant: HCFC and HFC
    Applicable Medium Temperature: -40℃~+80℃
    Max.Operating Pressure 4.5MPa
    Max.Allowable Pressure 6.8MPa
    Yearly Leakage of Refrigerant ≤2g R22/a


    Note: For the fully enclosed compressor, generally the allowable water cut is in a range 30~75ppm, but for other types of compressor, the water cut will be higher slightly. For an effective protection, it is necessary to monitor the indicator carefully and replace the drier immediately if the color is changed into yellow.


    Correlation betwen Water Cut and Color:

    Water Cut(ppm)
    25℃ 43℃
    Green/DRY Medium Color Yellow/WET Green/DRY Medium Color Yellow/WET
    R22/R502 <30 30~120 >120 <50 50~200 >200
    HFC-134a <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


    Structure:


    Model A B ΦC ΦD E F L S Thread M Weight(g)
    SGN SGS
    SGN/SGS-1/4 ODF 9.5 14.5 28 6.5 7 27 102 14 —— 105 125
    SAE —— —— 14 64 7/16-20UNF 145 145
    SGN/SGS-3/8 ODF 10.1 8 36 119 —— 110 155
    SAE 12.5 16.5 —— —— 17 70 19 5/8-18UNF 215 195
    SGN/SGS-1/2 ODF 12.8 10 46 146 —— 170 150
    SAE 13 18 —— —— 19 78 22 3/4-16UNF 240 210
    SGN/SGS-5/8 ODF 16.1 14 46 152 —— 190 220
    SAE 15 20 31.5 —— —— 20 78 24 7/8-14UNF 350 300
    SGN/SGS-3/4 ODF 19.1 16 51 167 —— 270 230
    SAE 18 23 —— —— 23 94 29 1-1/16-14UNS 545 440
    SGN/SGS-7/8 ODF 16.5 21.5 22.3 17 54 173 27 —— 315 290
    SGR-3/4NPT NPT 10.5 13 —— —— —— —— —— 32 3/4NPT 90
    SGR-G3/4 G G3/4 70


    Features:

    Model SGN and Model SGS

    · Be applicable to HCFC/HFC refrigerants.

    · Indicate high water cut in system if any.

    · Indicate no overcooling in refrigerant liquid.

    · Indicate insufficient charging of refrigerant if any.

    · Both welded and threaded connections are available.


    Model SGR

    · Be applicable to HCFC/HFC refrigerants.

    · Indicate the liquid level in the liquid drum.

    · Indicate the oil level in the compressor crankcase.

    · NPT threaded connection.