please kindly tell me how do you call it in English? Sight Glasses or Liquid indicator? thank you.

In the USA it's commonly referred to as a "Sight Glass"please kindly tell me how do you call it in English? Sight Glasses or Liquid indicator? thank you.
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please kindly tell me how do you call it in English? Sight Glasses or Liquid indicator? thank you.
Proper Refrigeration term for it is a Moisture & Liquid Indicator. Some Lennox Furnaces have a sight glass on the door to check the burner flame without openning the access panel.
I call it a liquid line sight glass, that way it eliminates the possibility of a customer thinking I was inspecting a Lennox furnace when I was called out to look at a refrigeration problem.Proper Refrigeration term for it is a Moisture & Liquid Indicator. Some Lennox Furnaces have a sight glass on the door to check the burner flame without openning the access panel.
I would also refer to it as the liquid line sight glass but for other reasons. Most if not all racks also have oil sight glasses on the resevoir/ and some have liquid bleed sight glass on the critical charge line, most compressors have oil pot sight glasses and oil sight glasses on the body/ this is not to be confused with the sight glass in the managers door when you go to get the bill signed.I call it a liquid line sight glass, that way it eliminates the possibility of a customer thinking I was inspecting a Lennox furnace when I was called out to look at a refrigeration problem.