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Fisher™ J31 Series Rotary Gauges
J31 Series can be used on stationary or mobile tanks to visually indicate the amount of LP-Gas or anhydrous ammonia (NH3) in the container.
The gauge is operated by opening the small bleed orifice when the tube is in the vapor space of the tank. Moving the pointer on the dial causes the end of the tube to move until it contacts liquid in the container, at which time discharge from the bleed orifice turns from vapor to liquid giving the volume percentage of liquid in the tank.
Fisher™ J31 Series Rotary Gauges


Dial Material
Packing Sleeve/Friction Ring Material
Fluid Compatibility
LPG, Anhydrous Ammonia (NH3)
Stem Tube Extension Length
68 to 140-inch / 1,73 to 3,56 m
Temperature Capabilities
-20° to 160°F / -29° to 71°C


  • Minimize Vibration Effects
  • Extra Large Inside Diameter Assuring Correct Liquid Level Quickly
  • Nylon Packing Sleeve for Longer Service Life
  • Friction Ring for the Pointer Inicator for Smooth Rotation