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Experience Sharing: Refrigeration System Sight Glass Function and Daily Inspection

  • Release time: 2026-09-12

Experience Sharing: Refrigeration System Sight Glass Function and Daily Inspection

Sight glass is an intuitive observation component installed on liquid pipeline for refrigeration system status checking. Liquid full flow without bubbles inside sight glass indicates stable refrigerant supply to expansion valve. Continuous bubbles inside sight glass usually mean insufficient refrigerant charge or pipeline blockage. Built-in moisture indicator inside sight glass shows moisture level through color change of chemical agent. Sight glass should be installed at horizontal liquid pipeline section with convenient observation position. Formal refrigeration factory installs sight glass on liquid line for all medium and large cold room refrigeration systems. Xindacool equips high-precision sight glasses for complete refrigeration sets of industrial cold storage. Foggy or stained glass surface affects visual judgment and needs cleaning during routine maintenance. Around 30% of refrigerant shortage problems are first discovered through observation of sight glass bubbles. High vibration locations are avoided during installation to prevent seal leakage of sight glass. Inspection of sight glass should be completed when refrigeration unit runs under stable working condition. Regular sight glass checking helps operators discover refrigerant and moisture issues at early stage.

FAQ

  1. Q: Where is sight glass mounted on refrigeration circuit? A: On the liquid pipeline before expansion valve.
  2. Q: What does continuous bubbles inside sight glass indicate? A: It may mean insufficient refrigerant or partial pipeline blockage.
  3. Q: How does sight glass reflect moisture inside system? A: Built-in chemical indicator changes color according to moisture content.
  4. Q: What percentage of refrigerant shortage is found via sight glass? A: 30% of refrigerant shortage problems are first detected from sight glass observation.
  5. Q: What installation point should be avoided for sight glass? A: Positions with strong mechanical vibration to prevent seal leakage.

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