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The function of a Sight Glass is to provide visual indication of fluid
level or flow within a vessel or piping system.
Henry Technologies offers three series of NPT Sight Glasses for use in a
variety of refrigeration and industrial applications. The Sight Glasses are
available with Clear Lens, Reflex Lens, and Clear Lens with Floating Ball.
The Clear Lens design allows for unobstructed visual inspection of fluid level
or flow. The Reflex Lens is designed to allow easier fluid level inspection by
appearing dark when liquid is present and light when liquid is absent. The
Float Ball series is also designed to provide easier inspection of fluid level.
The standard Float Ball is made of TPX plastic and will float in an fluid with a
specific gravity greater than 0.85.
Henry Technologies' SG-1000 and SG-1100 series Sight Glasses are
suitable for use with ammonia, HFC and HCFC refrigerants and their
associated oils, as well as other industrial fluids non-corrosive to steel and
glass. SG-1200 series Sight Glasses are suitable for use with HFC and
HCFC refrigerants and their associated oils, as well as other industrial fluids
non-corrosive to steel, glass and TPX plastic.
Hermetically sealed viewing lens
High pressure rating
Plated steel housing
Three lens configurations for a variety of applications
Materials of Construction
All Sight Glasses feature a plated steel body with hermetically sealed soda
lime glass lens. The SG-1200 series Sight Glasses come standard with a
TPX plastic Float Ball but are available with an aluminum Float Ball by
adding a “C” suffix. (i.e. SG-1208C)
Maximum working pressure = 1000 PSI (68.9 Bar)
Allowable operating temperature SG-1000, SG-1100 =
-20°F to +500°F (-29°C to +260°C)
Allowable operating temperature SG-1200 =
-20°F to +300°F (-29°C to +149°C)
Henry Technologies' Sight Glasses are USR and CNR recognized by
Underwriters Laboratories, Inc. Additionally, all Sight Glasses are designed
and registered for use in Canada. Please contact Technical Support at
1-800-627-5148 for CRN details and list of approved provinces and
territories. Sight Glasses can be CE marked in accordance with PED by
adding a “-CE” suffix to the part number. (i.e. SG-1008-CE)
Clear with Ball
SEP CAT II
*Optional Cat I and II CE models available by adding “-CE” suffix to part number. (i.e. SG-1112-CE)
Installation - Notes
1. Install with socket wrench to avoid glass cracking. An open-end wrench
should not be used.
2. The user must ensure the Sight Glass is installed with appropriate
thread sealant for the application.
3. Full instructions are given in the Product Instruction Sheet, included
with each Sight Glass.