Data Sheet
Sight glass
Type SG and SGP
Refrigeration system protectors
Danfoss sight glasses, type SG/SGP, are installed
after the lter drier in liquid line of refrigerating
systems and in the compressor by using socket
type, in order to observe property changes of
the refrigerant (liquid/vapor) and to indicate
the moisture level by colors.
Features:
• Available with are, solder and socket
connections, with and without moisture
indicators.
• Large viewing window for better visibility
• High precision color indicator
• Provides accurate identication of system
conditions
• Easy to indicate liquid and oil level by oat
ball of socket type
• Good corrosion resistance by 2000 hours salt
spray for brass material according to ASTM
B117 requirement
• UL approval, conforms to Pressure Equipment
Directive 2014/68/EU
AI367918410656en-000101
Sight glass, type SG and SGP
Functions
The moisture indicators consist of a sensitive element that changes colour, from green to yellow, according to the
moisture content PPM in the system.
The values under “green/dry” are to be considered as perfect condition meaning full protection against harmful
eects from moisture.
If the green color starts to fade, the moisture content is reaching a critical level.
If the color changes to yellow it is a clear signal, that the capacity of the lter driers is exceeded and should be
replaced as soon as possible.
If the operating conditions of the system are normal, the refrigerant uid appears liquid through the glass of the
indicator. The presence of bubbles indicates that lack of subcooling and the refrigerant deciency.
At start-up, the colour of the sensitive element may be yellow, due to exposure to air humidity or due to moisture in
the circuit. When the moisture of the refrigerant is returned to acceptable levels by the lter drier, the indicator
colour turns green again. This is evidence that equilibrium has been re-established. If the yellow colour persists,
measures must be taken to eliminate moisture. Only when the sensitive element turns green again, is there
evidence that measures adopted were eective.
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Danfoss
9G8082
Sight glass, type SG and SGP
Applications
Danfoss sight glasses, type SG/SGP:
• Can be installed in the liquid line between the lter drier and the expansion valve to monitor the condition and
moisture content of the refrigerant(with indicator type).
• Can be installed in the receiver to monitor the refrigerant liquid level (socket type).
• Can be installed in the compressor/oil separator to monitor the oil level (socket type without indicator).
NOTE:
When storing, transporting or installing the Sight Glass, avoid the chemical indicator to get in contact with nonrefrigerant medium or uid (like water, oil, ect.)
Typical applications for SG/SGP are:
• Cold room
• Chiller
• Heat pump
• Transport refrigeration
Figure 1: Typical applications for SG/SGP
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Valve type
Max. working pressure
Indicator type
Refrigerants
(PS/MWP)
SG
35 bar / 500 psig
N type
R22, R134a, R404A, R407C, R507, R407A, R407F, R448A, R449A, R450A,
R452A, R513A
SGP
52 bar / 754 psig
I type
R290, R600, R600a
N type
R134a, R22, R32, R404A, R407A, R407C, R407F, R407H, R410A, R448A,
R449A, R450A, R452A, R452B, R454B, R454C, R455A, R463A, R507, R513A,
R515B, R1233zd(E), R1234ze(E), R1234yf, R1270, R744 (CO2 )
Sight glass, type SG and SGP
Media
Table 1: Media specication
Refrigerant oil: Mineral oils and ester oils
NOTE:
• For a complete list of approved refrigerants, visit store.danfoss.com and search for individual code numbers, where
refrigerants are listed as part of product details.
• Flare/Face seal/socket connections are only approved for A1 and A2L refrigerants. This product is approved for
R290, R32, R452B, R454B, R454C, R455A, R600, R600a, R1234ze(E), R1234yf, R1270 by ignition source assessment in
accordance to standard EN ISO 80079-36.
• SGP with indicator is not suitable for oil line application. For detailed information please contact Danfoss.
• Socket type can be used with refrigerant R744 (CO2 ) except for the version with oat ball.
• Socket type can be used with refrigerant R1233zd(E) except for the version with gasket.
• For the Max. media temperature which is above 55 °C /131 °F for socket type with oat ball, please consult
Danfoss.
For the application use with R744 as part of a secondary loop or cascade:
1.
The design pressure of the refrigerant containing component is not less than the design pressure of the
associated components.
2.
The component is not provided with any pressure relief or pressure regulating relief valve and that a sucient
number of valves having capacity deemed adequate shall be eld-installed on the refrigeration system.
3.
When the refrigeration system is de-energized, venting of R744 may occur through the pressure regulating relief
valves, and may need to be recharged, but the valve should not be defeated or bypassed.
4.
A sucient number of pressure relief and pressure regulating valves may need to be provided based upon
system capacity and located such that no stop valve is provided between the relief valve and the parts or section
of the system being protected.
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Technical dataSGSGP
Max. working pressure
35 bar / 500 psig
52 bar / 754 psig
Media temperature range
-50 – 80 °C / -58 – 175 °F
Environmental transport/storage temperature and humidity
-40 – 65 °C /-40 – 150 °F. Air humidity: RH≤95%.
Refrigerant
Moisture content ppm = parts per million
I type indicator
Media temperature 25 °C / 77 °F
Media temperature 43 °C / 109 °F
Green / dry
Intermed. color
Yellow / wet
Green / dry
Intermed. color
Yellow / wet
R290
< 25
25 – 50
> 50
< 50
50 – 100
> 100
R600
< 10
10 – 20
> 20
< 28
28 – 55
> 55
R600a
< 11
11 – 22
> 22
< 30
30 – 60
> 60
Refrigerant
Moisture content ppm = parts per million
N type indicator
Media temperature25 °C / 77 °F
Media temperature 43 °C / 109 °F
Green / dry
Intermed. color
Yellow / wet
Green / dry
Intermed. color
Yellow / wet
R134a
< 30
30 – 100
> 100
< 45
45 – 170
> 170
R22
< 30
30 – 120
> 120
< 50
50 – 200
> 200
R32
< 64
64 – 289
> 289
< 116
116 – 459
> 459
R404A
< 20
20 – 70
> 70
< 25
25 – 100
> 100
R407A
< 29
29 – 115
> 115
< 48
48 – 192
> 192
R407C
< 30
30 – 140
> 140
< 60
60 – 225
> 225
R407F
< 30
30 – 168
> 168
< 60
60 – 240
> 240
R407H
< 35
35-180
> 180
< 60
60-365
> 365
R410A
< 66
66 – 266
> 266
< 135
135 – 540
> 540
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
R452B
< 70
70 – 260
> 260
< 144
144 – 260
> 260
R454B
< 29
29 – 161
> 161
< 58
58 – 250
> 250
R454C
< 25
25-115
> 115
< 30
30-190
> 190
R455A
< 20
20-95
> 95
< 25
25-145
> 145
R463A
< 55
55-280
> 280
< 95
95-435
> 435
R507
< 15
15 – 60
> 60
< 30
30 – 110
> 110
R513A
< 22
22 – 75
> 75
< 22
22 – 123
> 123
R515B
< 20
20-95
> 95
< 20
20-140
> 140
R1233zd(E)
< 18
18-90
> 90
< 20
20-150
> 150
R1234ze(E)
< 26
26 – 132
> 132
< 28
28 – 165
> 165
R1234yf
< 20
20-43
> 43
< 20
20-63
> 63
R1270
< 16
16 – 62
> 62
< 29
29 – 115
> 115
R744 (CO2 )
< 80
80 – 195
> 195--
-
Sight glass, type SG and SGP
Product specication
Technical data
Table 2: Technical data for SG/SGP
Table 3: I type indicator for R290, R600, R600a
Table 4: N type indicator for R134a, R22, R32, R404A, R407A, R407C, R407F, R407H, R410A, R448A, R449A, R450A, R452A,
R452B, R454B, R454C, R455A, R463A, R507, R513A, R515B, R1233zd(E), R1234ze(E), R1234yf, R1270, R744 (CO2 )
NOTE:
For colours reecting moisture values of other refrigerants and other media temperature, please contact Danfoss.
REACH requirements
All Danfoss products fulll the requirements in REACH.
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Danfoss
014A0513
Position
Inscription
Explanation
Box label
Sight glass
Product name
Box label
SGP 10s N
Product type
Box label
014L0182
Code number for ordering
Box label
ODF 3/8 in
Connection size and type
Box label
PS 52 bar/MWP 754 psig
Max. working pressure in bar and psig
Box label
BE5020E
Code for production place and time
(BE = Wuqing, week 50, year 2020, weekday E =Friday)
Box label; Product label
MADE IN CHINA
Manufacturing site acc. to EN standards
Box label
EAN code
Barcode for individual code no. identication according to EAN standard
Box label
Additional information: Relevant approval authority logos
Product label
Max. 80 °C/175 °F
Max. media temperature
Product label
WET/DRY
The colour of indicator: Yellow for wet; Green for dry
Sight glass, type SG and SGP
One of the obligations in REACH is to inform customers about presence of Candidate list substances if any, we
hereby inform you about one substance on the candidate list:
A moisture indicator in a sight glass contains a paper which is impregnated with Cobalt Dichloride (CAS no:
7646-79-9) in a concentration above 0.1% w/w. If the valve has been damaged or dismantled:
• Avoid skin contact with the paper
• Do not inhale the dust from the paper
• The paper must be disposed as hazardous waste
Identication
Relevant product data is available on the product and box label. An example of a box label and product label are
shown, including an explanation of the content.
Figure 2: Box label (example) Figure 3: Product label (example)
Table 5: Label explanation
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