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Danfoss : Sign Glass : SGN 12 1/2" : Flare Connection

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  • ใช้กับการทำความเย็นไม่ติดไฟหรือ HFC :  ( Refrigerant : HCFC / Non Flam HFC )

  • ใช้ตรวจระดับความชื้นในระบบ

  • การติดตั้งและนำไปใช้งานเป็นแบบ Flare

  • ขนาด 1/2" ทั้งสองด้าน

Danfoss : Sign Glass : SGN 12  1/2" : Flare Connection

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  • Danfoss : Sign Glass : SGN 12  1/2" : Flare Connection

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Sight Glass

SGN ( Refrigerant : HFC )

Sight glasses are used to indicate:

The SGI/N and SGRI/N are equipped with sensitive indicators that reflects a colour,
depending on the moisture content in the refrigerant.

Type SGN / SGRN

*For Non- flammable HFC refrigerants

* Indicates too high water content in the refrigeration system

* Indicates lack of subcooling

* Indicates refrigerant deficiency

* Flare/solder connection or socket type

HCFC and Non- flammable HFC :  Flare ext. × ext. Connection
Type Version Connection [in.] Connection [mm] Code no.
SGN 6 Flare ext. × ext. ¼ x ¼ 6 × 6 014-0161
SGN 10 Flare ext. × ext. 3/8 x 3/8 10 × 10 014-0162
SGN 12 Flare ext. × ext. ½ x ½ 12 × 12 014-0163
SGN 16 Flare ext. × ext. 5/8 x 5/8 16 × 16 014-0165
SGN 19 Flare ext. × ext. ¾ x ¾ 19 × 19 014-0166

  
Dimensions [mm] and weights [kg]
Type Version L H H1 B1 øD Net weight
SGI / SGN 6 Flare ext. × ext. 67 24 14 14 27 0.1
SGI / SGN 10 Flare ext. × ext. 82 28 16 19 32 0.2
SGI / SGN 12 Flare ext. × ext. 88 30 18 22 32 0.3
SGI / SGN 16 Flare ext. × ext. 104 37 21 27 37 0.4
SGI / SGN 19 Flare ext. × ext. 110 41 22 32 37 0.5
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 Non- flammable HFC refrigerants, e.g. R134a, R404A, R407C react with water in a hydrolysis generating acid and alcohol.
The recommended levels of moisture content are usually between 30 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 color on the sight glass indicator depends on the moisture content of the refrigerant.
The values under “green/dry” 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 color starts to fade, the color change has begun and the indicator should therefore be watched more carefully. If the color 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.

SGN / SGRN for HCFC and Non- flammable HFC refrigerants
Moisture content ppm = parts per million
SGN / SGRN
25 °C 43 °C
Green/ dry Intermed. color Yellow/ wet Green/ dry Intermed. color Yellow/ wet
R22 < 30 30 – 120 > 120 < 50 50 – 200 > 200
R134a < 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

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