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Liquid Level Switch

Application | Overview | Features

The Model PLS Liquid Level Switch provides up to six independent liquid level switches on one sealed probe up to 72" in length.  Magnetic reed switches are encapsulated in the sealed brass probe where they are protected from liquid and vapors.

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Liquid Level Switch, Model PLS
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Liquid Level Switch, Model PLS

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  • Application
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The Model PLS Level Switch may be used with any clean, low viscosity, non-adhering fluid compatible with brass, solder, epoxy and Buna-N.  It is commonly used on fuel oil day tanks to control the addition of oil from remote pumps, and to alarm  high and low levels.  Other applications include pressurized or vented tanks for water, hydraulic fluid, lubricating oils or distillate fuels.  Insert the unit vertically and then thread it into a 1 ¼" NPT half coupling on the tank shell.  The wiring enclosure is not designed to be submerged.  A suitable protective enclosure for access such as the Preferred Sidewalk Box Model 13071 should be provided when installing underground. 
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  • Overview
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The Model PLS Level Switch provides up to six independent liquid level switches on one sealed probe up to 72" in length.  Magnetic reed switches are encapsulated in the sealed brass probe where they are protected from liquid and vapors.  Buna-N floats, containing magnets, slide on the outside of the brass probe.  A rising liquid level causes each float to rise to its upper travel stop position where it actuates a switch.  Any switch may be specified “open” or “closed” with the float at its lower stop position.
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  • Features
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Fluid Temperature:  180° F Maximum

Fluid Specific Gravity: 0.5 Minimum

Fluid Pressure:  150 PSI Maximum

Electrical:  100W at 120 VAC Resistive 8VAC Relay Coil Pilot Duty

Switch Action:  Can Be N.O. or N.C.

Housing:  Cast Aluminum, UL Listed

Wetted Parts:  Brass Probe And Buna-N Float

  • Custom Fabricated Up To 72" In Length
  • May Be Used With Any Clean, Low, Viscosity, Non-Adhering Fluid
  • Switches May Be Specified "Open" Or "Closed"
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