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1" Threaded Liquid Level Gauges for LP Gas Service

Carl Frankenfield Photo


Gauging LP Gas levels in ASME tanks and DOT cylinders.

General Information & Features

This series of 1" NPTF Junior top mounting gaues is available with forged brass head.

Now with R3D®

The Rochester Remote Ready Dial, R3D®, is a magnetically-driven, Hall Effect compatible dial. Dials are utilized on stationary applications where direct reading plus an electrical signal to a remote fuel level monitor may be required.

Rochester’s Hall Effect Module is designed to snap-fit into the recess in the Remote Ready Dial lens. Once installed, the module can provide ratiometric voltage output proportional to the liquid volume inside the tank.


Data Sheet

Installation Directions - DS-629

Threaded Gauge Installation Instructions - MS 516

General Specifications*

Temperature Range

Extremes are -40°F to 158°F, -40°C to 70°C

Working Pressure

375 psig [25, 8 Bar]


Accuracy depends upon proper gauge sizing and is typically ±5% of R3D® dial indication. Accuracy may be less due to variations in liquid temperature. Accuracy may be less for some tank shapes and sizes. Accuracy may be less if tank is not level. Accuracy may be less near empty and full. This gauge is not to be used for filling. R3D® dial output voltage is typically ±4% of indicated reading. All accuracy estimates are percent of full scale.


Gauge is UL listed for LP gas service applications.
R3D® Module is UL Classified an intrinsically safe.

U.S. Patents

6,523,406; 6,253,609; 6,523,406; 7,219,546

Model Selection Chart

Model Head Material Mounting Dial Type
B8981-04000 Brass Top R3D Direct Read Screw Mounted
B8981-04200 Brass Top R3D Direct Read Snap-on

Materials of Construction*


Brass forging

Pinion Gear, Cross Stud & Sector Gear



Stainless steel, brass & acetal

Gear Housing


Support & Centershaft

Tempered aluminum


Nitrile rubber

Counterweight & Float Rod

Plated steel



R3D® Direct Reading Dial

Hermetically sealed polycarbonate

When Ordering Specify:

1. Specify tank diameter (shown on tank nameplate)
2. Specify the gauge mounting location
3. State the type of cylinder, horizontal or vertical

4. Specify the "H" dimension. This is the distance in inches from the surface of the tank to the top of the threaded opening.

To order replacement gauge, simply furnish the information stamped on the hex wrenching flats, as show in the example

Note: For installation instructions see DS-629 (data sheet)

*Materials and specifications are subject to change without notice. Pressure ratings subject to change due to temperature and other environmental considerations.