The function of a Liquid Indicator is to provide visual indication of
fluid level or flow within a vessel or piping system.
Henry Technologies' Liquid Indicators are used in a variety of refrigeration
and industrial applications. The Liquid Indicators feature weld-in housings
with a replaceable Sight Glass in clear or Reflex lens. The Clear Lens
design allows for unobstructed visual inspection of fluid level or flow while 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 optional
Frost Shield allows easy view of the Sight Glass when installed in an
application where insulation is used.
Henry Technologies' Liquid Indicators are suitable for use with ammonia,
HFC and HCFC refrigerants and their associated oils, as well as other
industrial fluids non-corrosive to steel, glass and Teflon.
Patented Henry Technologies' Design*
Replaceable, hermetically sealed clear or Reflex lens Sight Glass
Frost shield available for insulated applications
Plated steel housing
Materials of Construction
The Liquid Indicators body is made of plated steel. The Sight Glass body is
plated steel with hermetically sealed soda lime glass lens. The Sight Glass
seal is made of Teflon.
Maximum working pressure = 500 PSI (34.4 Bar)
Allowable operating temperature = -40°F to +250°F (-40°C to +121°C)
Henry Technologies' Liquid Indicators are constructed to ASME Section VIII,
Division 1 UG-11 (a) (1). Additionally, Liquid Indicators can be CE marked in
accordance with PED by adding a “-CE” suffix to the part number. (i.e. LI-50-
Installation - Notes
1. Sight Glass assembly must be removed before welding Liquid Indicator
2. A metal protector is supplied to cover the threads on the body to avoid
damage by welding spatter.
3. Ensure Liquid Indicator body is cool and clean before installing Sight
4. Full instructions are given in the Product Instruction Sheet, included
with each Liquid Indicator.
*Dimension includes Frost Shield sold separately
**Optional Cat I CE models available by adding “-CE” suffix to part number. (i.e. LI-50-4W-CE)
Accessories and Replacement Parts
Clear Sight Glass
Reflex Sight Glass
Optional Frost Shield