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.
• 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.)
• 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.
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.
You will nd downloadable dimension drawings for individual code numbers on Danfoss store as part of the Visuals
tab for individual code numbers.
Weights also dier depending on the design of the individual code numbers. Weights are available as part of the
technical data for individual code numbers on store.danfoss.com.
Figure 6: Flare, ext. × ext.
Table 8: Dimensions and weights for are connection
SG/SGP can be provided with are, solder ODF/ODF or ODF/ODM and socket version in a wide variety of connection
sizes. Solder versions are with extended ends copper connections. For details on availability, see Ordering section
SG/SGP code numbers described in this data sheet are standard code numbers, i.e. made to stock.
Besides code numbers made to stock SG/SGP is also made to order. Make to order options include:
• Mechanical connection type
• Mechanical connection size
• New refrigerant
Multipack contains several items, individually packed, so that customers can purchase 1 item and receive all relevant
documentation.
Industrial pack contains several items that are not individually packed. Industrial packs cannot be broken down, and
will only contain documentation on pack level, not on item level.
The list contains all certicates, declarations, and approvals for this product type. Individual code number may have
some or all of these approvals, and certain local approvals may not appear on the list.
Some approvals may change over time. You can check the most current status at danfoss.com or contact your local
Danfoss representative if you have any questions.
Table 19: Certicates, declarations, and approvals
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