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6700 Series Gauge

Adjustable Magnetic Gauges

Application

Measures gasoline or diesel fuel levels in tanks on trucks, boats, generators, recreational vehicles, and other applications.

General Information & Features

These top mounting magnetic liquid-level gauges are built to the high standards of all Rochester designed instruments. The construction permits the replacement of dials when necessary without releasing fumes or liquid to the atmosphere.

Both available dials are fractional and silicone-dampened, and are easily replaced by removing and reinstalling two screws. Rochester's rugged gear drive incorporates shrouded, stainless-steel, beveled gears designed to work out any loose particles that might affect gear function. Sealing between the gauge and the tank is achieved through the use of the 0015-00423 Buna-N gasket.

Adjustable liquid-level gauges are designed for top mounting only. These gauges are equipped with 20.5" [520mm] long float arms which can be cut to fit tank dimensions. Request data sheet DS-337 for proper cut lengths and instructions on how to install the float and crimp it in place.

Model Number Magnet Available Dials
6741 Large Alnico Direct-reading dial or TwinSite® sender.
Choice of 0-90, 340-30 Ohms
6781 Small Alnico Direct-reading dial only.

Model Selection Chart

Model Number Dial Used Gasket Used
6741-00183 Not Furnished 0015-00423
6741-00290 P5744S02541
6741-00333 Not Furnished
6741-00248 5323S01834 0015-00423

 

Documents

Data Sheet

Installation Instructions MS-532

Tank Depth in Inches Distance from Float Bend to Float Rod Cut-off Point
6 3"
7 3-3/4"
8 4-5/8"
9 5-5/8"
10 6-5/8"
11 7-5/8"
12 8-5/8"
13 9-3/4"
Tank Depth in Inches Distance from Float Bend to Float Rod Cut-off Point
14 10-3/4"
15 11-3/4"
16 12-3/4"
17 13-3/4"
18 14-7/8"
19 15-7/8"
20 16-7/8"
21 17-7/8"
Tank Depth in Inches Distance from Float Bend to Float Rod Cut-off Point
22 18-7/8"
23 20"
24 21"
25 22"
26 23"
27 24"
28 25-1/8"
29 26-1/8"
Tank Depth in Inches Distance from Float Bend to Float Rod Cut-off Point
30 27-1/8"
31 28-1/8"
32 29-1/8"
33 30-1/4"
34 31-1/4"
35 32-1/4"
36 33-1/4"

General Specifications*

Mounting

Recommended for top-mounting only.

Accuracy

Accuracy depends upon proper gauge sizing. Junior dials ±7%, TwinSite® dials ±12%. Accuracy may be less depending upon tank shape. Accuracy may be less near full and empty. Accuracy may be less if tank is not level. This gauge is not to be used for filling. All accuracy estimates are expressed as a percent of full scale.

Temperature

-40°F to 158°F, -40°C to 70°C.

Humidity

For high humidity and marine applications, painting of gauge, less dial, is recommended.

Shock & Vibration

Suitable to mobile applications.

Power

0.5 watts maximum for TwinSite® versions.

Tank Pressure

0 to 10 PSIG [0 to 0,68 Bar].

Approvals

Some models are UL recognized for marine service. Some models are UL listed for flammable fluids. Passes BIA fire test.

Note: For Installation Instructions see MS-532.

 

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

Materials of Construction*

Head

Die cast aluminum with standard SAE gasoline gauge flange (2-1/8" [54 mm] bolt circle for five #10 screws not furnished.)

Centershaft, Support Tube & Float Rod

Tempered aluminum.

Gears, Cross Stud & Bearing

Stainless steel.

Drive Magnet

Alnico.

Gear Housing

Acetal plastic or aluminum.

Float

Nitrile rubber.

Gasket

Buna-N, 0015-00423.

Direct Reading Dial

Hermetically sealed polycarbonate.

TwinSite® Sender

Polyamide.

When Ordering Specify:

1. Gauge model number.

2. Tank depth.

3. Float orientation, 3 o'clock standard.

4. Details on any optional features.

09-11-2017