Pressuretrol, Modulating, 10 to 300 PSI


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Honeywell proportional pressuretrol controller with a range of 10-300 psi (adjustable 12-48 psi differential range), one potentiometer, and a 1/4″ NPT female connection to siphon loop. L91 proportioning pressuretrol controllers provide direct control of modulating motors or valves used on automatic burners or steam heating systems. L91B models have adjustable proportioning (throttling) range to allow selection of desired pressure control range.

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SKU: CON-UNSORTED-L91B1241 Category: Tags:

Single potentiometer; adjustable proportioning range.


  • Adjustable proportioning (throttling) range to allow selection of desired pressure control range
  • Use with steam, air, noncombustible gases, or other fluids non-corrosive to the brass or phos-bronze (300 psi models) bellows.
  • Pressure Sensing Element: Brass bellows, 10-300 psi models phos-bronze bellows
  • Adjustment Means: Screws on controller case top; knurled knob for main scale setting on 10 to 300 psi (0.07 to 2.07 MPa) models
  • Potentiometer Action: Wiper moves toward W on pressure rise, toward B on pressure fall. Potentiometer is field replaceable.
  • Setpoint: At low pressure end of proportioning (throttling) range.
  • Do NOT use with combustible mediums or any medium chemically harmful to phos-bronze bellows (10-300 psi models) or brass bellows (all other pressure range models).


Manufacturer ID


Operating Range

10 to 300 PSI

Switch Operation


Pressure Differential

30 to 110 PSI

Product Data

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