Consent Preferences

8500 Series

Acetyl 4 Bolt Gauge for Low-Pressure, Ambient Temperature Tanks

The 8500 Series Senior gauges are specially designed for low-pressure, ambient temperature use in potable water tanks and holding tanks for gray or waste water on boats and recreational vehicles. Aircraft de-icing liquids and ethylene glycol/water mixtures in radiators have been successfully measured with these gauges.

General Information & Features
The 8500 Series gauges are available in gear-action models for top, centerline or angle mounting or in lever-action models for centerline mounting only.

The standard float is nitrile rubber. Polypropylene (FDA approved for potable water service) and stainless-steel floats are also available. Please specify your choice. The gauge is attached to a Senior flange with 2 1⁄2″ bolt circle through use of four, 1⁄4″ – 28 x 9⁄16″ long bolts. The gasket is Buna-N.

Data Sheet
Installation Instructions — MS-530
Adapters 22 Series – Senior Stamped Brass

Model Number Action Mounting Dial, Sender or Switch Data
8540 Gear Top Senior TwinSite® Sender in choice of 0-30, 0-90, or 240-30 Ohm ranges. Direct-reading fractional dials may also be used.
8543 C/L or Angle
8550 Top Senior S.P.S.T. 1/2 Amp, standard. Many other switches available, see DS-364.
8553 C/L or Angle
8560 Top Senior side-reading fractional dial.
8580 #5002S00062 Senior direct-reading.
8583 C/L or Angle
L8543 Lever C/L #5141S00570 Senior direct-reading.
L8553 Senior S.P.S.T. 1/2 Amp, standard. Many other switches available, see DS-364.
L8583 #5002S00547 Senior direct-reading.

General Specifications*

Dial Data
Dials & senders are hermetically sealed & tested in 8″ Hg vacuum.

Accuracy depends upon proper gauge sizing. Senior dials ±6%, TwinSite® dials ±10%. 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 Range
Standard is -40°F to 158°F, -40°C to 70°C.

Exposed portion is suitable for high humidity and marine applications.

Suitable for mobile applications.

Suitable for mobile applications.

0.5 watts maximum for TwinSite® versions.

Tank Pressure
0 to 25 psig [0 to 1,7 Bar]

Some models are UL recognized for marine water service.

Note: For installation instructions see MS-501/502 (mounting standards).

Materials of Construction*

Injection-molded polyester plastic.

Gear Housing or Stop Adapter
Injection-molded acetal plastic.

Centershaft, Support Tube & Float Rod

Gears, Cross Stud, & Bearings
Stainless steel.

Nitrile Rubber.

Buna-N, 0015-00004 or 0015-00079.

Drive Magnet
Plated Alnico.

Direct-Reading Dial
Aluminum with acrylic crystal.

Side-Reading Dial
Aluminum with Lexan crystal.

TwinSite® Sender

Mounting Bolts
Zinc-plated steel, stainless steel optional.

When Ordering Specify:

1. Gauge model number.
2. Tank diameter and riser height.
3. Mounting location.
4. Any listed options.

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

Product Inquiry - 8500

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    Revised 05/10/2016