G1620 Series Back Mount Sight Gage - Front Viewing With Card Thermometer

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The G1620 Series back mount closed circuit sight gages provide front viewing of the fluid level through a clear sight glass.  Integral to the sight gage is a thermometer contained within a white colored card for direct reading of the fluid temperature.  The white colored card helps draw eye contact to the fluid level quickly.

Standard Features:

  • Centerline lengths of 3, 5 and 10 inches
  • Back mount
  • 1.00 x .95 inch body machined from extruded aluminum bar stock
  • Fluid level visible from front of gage (.75 inches wide)
  • Clear sight glass
  • Card thermometer (3.00 inch centerline only), dual scale 60° to 180°F and 20° to 80°C graduations
  • Card thermometer, dual scale 0° to 220°F and -20° to 110°C graduations
  • 1/2-20UNF mounting studs accommodate reservoir wall thicknesses up to .75 inches
  • Suitable for use with most hydraulic and machine lubricating oils

Access to inside of reservoir is required to mount this style sight gage.

Standard Materials:

  • Aluminum construction
  • Buna N or Fluorocarbon (Viton®) seals
  • Borosilicate glass sight
  • Red color alcohol within thermometer bulb
  • Zinc plated, steel hex nuts


  • Not recommended for use with water, steam, acidic fluids, caustic fluids and volatile fluids.

Pressure Rating

  • 20 psi (138 kPa) maximum working pressure at 150°F (65°C)

Product Options

Common Modifications Available

  • Seal Material: Ethylene Propylene (EPDM)
  • Blue alcohol within thermometer bulb (not available for 3.00 inch centers)

Minimum quantities may apply.

Related Products

If the G1620 Series sight gages do not meet your application requirements, LDI offers several other sight gage products for monitoring fluid temperature and level that may meet these requirements.

Your fluid storage system is not complete until you define the reservoir.  Off-the-shelf or customized to your specifications, consider LDI your source for:



LDI - Corporate  Click for map LDI   Click for map
Precision Machining & Assembly Fabrication & Assembly
1864 Nagle Ave. 12901 Jim Dhamer Dr.
Manitowoc, WI  54220 Huntley, IL  60142
PH: 920.682.6877                         
FAX: 920.684.7210                         



Our talented team of degreed and professionally certified Engineers, Quality Assurance, Production and Customer Service staff have many years of experience in the industry.  Their attention to detail and ability to collaborate with our clients to solve their problems is reflected in the 50+ years we have been in business.


Customer Service: 

920.682.6877, option 4

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