SG Sight Glass is used to liquid line of refrigerant and air conditioning device, to indicate the flow situation of the refrigerant, the moisture content in the refrigerant, and the flow in the oil return line from the oil separator.
 
It is fitted with a moisture indicator,which changes color to show the moisture content in the refrigerant.
 
SG Sight Glass is using modified PTFE sealing materials, and applicable to a variety of refrigerant and POE oil, with perfect sealing performance.
 
SG Sight Glass applies anti-explosion connecting structure, which makes the observing of sight window safely and easily.
 
 
 Features
★   Compatible with all HCFC and HFC refrigerants;
★   Indicate over-high water contents in the refrigeration system;
★   Indication of refrigerant without Super cooling degree;
★   Indication of refrigerant deficiency;
★   Flare or soldering connection.
 
Technical Performance
Compatible Refrigerant HCFC、HFC
Working Temperature range -40℃～+80℃
Max. Working Pressure 3.5MP 
Max. Proof Pressure 5.2MPa
Burst Pressure ≥22MPa
Refrigerant Leakage ≤2g R22/year
 
Moisture Content VS Colour Change
  Moisture ppm（1%）
25℃ 43℃
Green/DRY Light Green Yellow/WET  Green/DRY  Light Green 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
R410A ＜66 66～266 ＞266 ＜135 135～540 ＞540
         
Note: the hermetic compressor allows moisture content between 30~75 PPM commonly, while other compressor is slightly high. In order to make the system get effective protection, must monitor indicator carefully, if the color is yellow, the dryer must be replaced.
 
Selection
Connecting Models Sizes Thread Models Sizes Inner/Outer Thread Models Sizes
SG-1/4 ODF 1/4（Ø6） SG-1/4 SAE 1/4（Ø6） SG-1/4 FM 1/4（Ø6）
SG-3/8 ODF 3/8（Ø10） SG-3/8 SAE 3/8（Ø10） SG-3/8 FM 3/8（Ø10）
SG-1/2 ODF 1/2（Ø12） SG-1/2 SAE 1/2（Ø12） SG-1/2 FM 1/2（Ø12）
SG-5/8 ODF 5/8（Ø16） SG-5/8 SAE 5/8（Ø16） SG-5/8 FM 5/8（Ø16）
SG-3/4 ODF 3/4（Ø19） SG-3/4 SAE 3/4（Ø19） ------ ------
SG-7/8 ODF 7/8（Ø22） ------ ------ ------ ------
SG-1-1/8 ODF 1-1/8（Ø28） ------ ------ ------ ------
 
Dimension
               

Models Connec-
tion		 A B ØC ØD E F L S Thread M Weight
(g)
SG-1/4 ODF 8.5 14.5 26.5 6.5 7 27 100 14 ----- 96
SAE --- --- 14 64 7/16-20UNF 100
FM 9.5 15 12 59 105
SG-3/8 ODF 8.5 14.5 10.1 8 36 118 ----- 105
SAE --- --- 17 70 5/8-18UNF 110
FM 12 17 15 65 145
SG-1/2 ODF 11.5 16.5 12.8 10 46 144 19 ----- 150
SAE --- --- 19 78 3/4-16UNF 165
FM 13.5 18 18 70 175
SG-5/8 ODF 13 18 16.1 14 49 150 22 ----- 185
SAE --- --- 20 78 7/8-14UNF 188
FM 15 20 --- --- 18 71 213
SG-3/4 ODF 14 20 31.5 19.1 16 51 166 24 ----- 240
SAE --- --- 23 94 1-1/16-14UNF 285
SG-7/8 ODF 15.5 21.5 22.3 17 54 172 27 ----- 290
SG-1-1/8 ODF 18.5 23.5 31.5 28.7 18 69 212 34 ----- 455
Above mentioned SEA connection doesn’t include nuts, nuts should be provided separately. Reference of weight for nuts: 1/4—18g, 3/8—32g, 1/2—41g, 5/8—56g, 3/4—138g.
Above mentioned FM threaded connection provides copper sealing ring.