sight glass
Transparent fluid monitor
A sight glass is a transparent window or tube built into equipment—tanks, boilers, pipes—that lets you see the liquid level or flow inside without opening the vessel.
Check the sight glass to make sure the refrigerant level is adequate.
Common in industrial machinery, coffee makers, and HVAC systems.
Standard of measurement
- viewportVisible display region
- windowGlass-fitted wall opening
- tubeHollow cylindrical passage
- cylinderCircular-based solid form
fitting · valve · flange · gasket · seal · housing · mounting · bracket
Heat-tolerant glass compound
- quartzCrystalline silicon dioxide
- polycarbonateStrong transparent synthetic polymer
- acrylicSynthetic resin or fiber
- temperedStrengthened through heat treatment
reinforced · transparent · shatterproof · heat-resistant · corrosion-resistant
Horizontal or uniform position
- flowUnbroken forward movement
- indicatorSign revealing status
- inspectionFormal assessment of condition
- observationAttentive watching or remark
viewing · checking · verification · readout · measurement · status · condition · visibility
Water-heating vessel
- tankLarge storage vessel
- vesselReceptacle for contents
- pipelineLong-distance fluid transport tube
- compressorPressure-increasing mechanical device
refrigeration · hydraulic · pneumatic · lubricator · reservoir · coolant · chemical · pharmaceutical
gauge
Standard of measurement
cylinder · fitting · valve · flange · gasket · seal · housing · mounting · bracket · connection
borosilicate
Heat-tolerant glass compound
- quartzCrystalline silicon dioxide
- polycarbonateStrong transparent synthetic polymer
- acrylicSynthetic resin or fiber
tempered · reinforced · transparent · shatterproof · heat-resistant · corrosion-resistant
level
Horizontal or uniform position
- flowUnbroken forward movement
- indicatorSign revealing status
- inspectionFormal assessment of condition
observation · viewing · checking · verification · readout · measurement · status · condition · visibility · clarity
boiler
Water-heating vessel
compressor · refrigeration · hydraulic · pneumatic · lubricator · reservoir · coolant · chemical · pharmaceutical · HVAC