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Magnetic Liquid-Level Gauges for Industrial Service

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M6200 Series gauges are widely used to measure liquid levels of fuels, hydraulic fluids, refrigerants, lube oils and cryogenic products in pressurized tanks, columns or vessels up to 300 PSIG [20,7 Bar]. Stainless steel mounting bolts are optional.

General Information & Features

Direct-reading fractional dials, gear actions and aluminum floats are standard models. Remote-reading Twin­Site® senders are available for some models. Lever actions are available for centerline mounted models. Nitrile rubber floats are optional. Please refer to instructions on “How to Order” on reverse side of this technical data sheet.


Data Sheet

MS-501-502 Installation Instructions

Adapters 22 Series - Senior Forged Steel

Adapters 22 Series - Senior Aluminum

Adapters 22 Series - Senior Machined Steel

Adapters 22 Series - Senior Zinc

Model # Type Mounting Standard Direct Reading Dial Remote-Reading Sensor
M6281 Jr. Top 5323s01793 N/A
M6240 Sr. N/A Specify 0-90 or 240-30 Ohm Twinsite® Senter
M6243 C/L or Angle
M6260 Top 5025s00570 (Side Reading) PDMV
M6280 5002s00062
M6283 C/L or Angle
M6290 Top 5013s00456 (4")
M6293 C/L or Angle
M6250 Sr. Switchgauge Top Standard Switch #5023S00778, S.P.S.T., 150 VDC, 1/2 Amp.
Please furnish tank drawings and switch points so proper gauge and
calibration can be supplied. Other switches available, see DS-364.
M6253 C/L or Angle

Extra Cost Option

1. For a nitrile rubber float, suitable for pressures up to 50 PSIG maximum or 250 PSIG maximum (specify if over 50 PSIG) in place of standard aluminum float, change prefix “M” to "N".

2. For lever action on C/L mounted gauges only, instead of gear action, add prefix ”L” to the model number.

3. Neoprene Senior gasket, part number 15-836.

4. Viton Senior gasket, part number 15-415.

5. Teflon Senior gasket, part number 15-401.

M6200 drawing

General Specifications*


Gear-action gauges are suitable for top, side, end or angle mounting. Lever-action gauges are suitable for centerline mounting on flat end of tank only.


Accuracy depends upon proper gauge sizing. Junior and Senior dials are ±6%, TwinSite® dials are ±10%. Accuracy may be less for some tank shapes and sizes. 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.


Standard operating temperature range -40°F to 158°F, -40°C to 70°C with optional stainless steel mountin bolts which maybe required for temperatures below -20°F, -29°C.


For high humidity and marine application, painting of exposed portion of gauge, less dial, is recommended.


Passes MIL-S-901 B Naval Standard Shock Test.


Passes MIL-STD-167 Naval Standard Vibration Test.


0.5 watts maximum for TwinSite® versions.

Tank Pressure

Up to 300 PSIG [20.7 Bar] with standard aluminum float and steel mounting bolts; up to 450 PSIG [31 Bar] with standard aluminum float and stainless steel mounting bolts.


Model M6200 direct indicating gauges are available with UL listing for flammable liquids. Models M6253 and M6283 are UL recognized refrigeration components.

NOTE: For installation instructions see MS-501/502 (mounting standard).


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

Materials of Construction*


Die-cast aluminum.

Gear Housing

Die-cast aluminum or acetal.

Center Shaft, Support Tube & Float Rod

Tempered aluminum.

Gears, Cross Stud & Bearings

Stainless steel.

Drive Magnet



One-piece aluminum is standard. Nitrile rubber available.


UL recognized Buna-N (#15-7 Jr. gasket and #15-4 Sr. gasket.

Standard Direct-Reading Dial

Jr. dial is hermetically sealed polycarbonate.
Sr. dial is aluminum with acrylic crystal, hermetically sealed.

Side-Reading Dial

Aluminum with polycarbonate crystal, hermetically sealed.

TwinSite® Dial


4" Dial

Aluminum housing, dial and besel with glass crystall, hermetically sealed.

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. Ohm range on TwinSite® versions.
5. Preferred switch on switchgauges, if other than standard.
6. Any listed options, or unlisted preferences.