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Pressure Switches & Gauges

PressureTrol® Pressure monitoring modulating controllers L91A, B

L91 Proportioning Pressuretrol® Controllers are Series 90 Modulating Pressure Controllers that provide direct control of modulating motors or valves used on automatic burners or steam heating systems.

Overview
Features & Benefits:
  • Models available for pressure systems up to 300 psi (2068 kPa)
  • May be used with steam, air, noncombustible gases, or other fluids noncorrosive to brass or phos-bronze (300 psi model) bellows
  • When used with steam boilers, a steam trap (siphon loop) is recommended
  • Wiper on controller potentiometer moves in response to pressure changes
  • L91D has two potentiometers for unison control of two motors
  • L91B,D models have adjustable proportioning (throttling) range to allow selection of desired pressure control range
  • Adjustments made with screws on case top
  • Large, easily-read scaleplates in both U.S. customary (oz/sq. in., psi, or in. Hg) and metric (kPa, MPa, or mm Hg) units
  • Steel case with clear plastic cover to observe pressure settings and potentiometer action
  • Fitting with 1/4 -18 NPT threads allows rapid installation
  • Surface mount with screws through knockout holes back of casing
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Product Number
Part Number
Description
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L91A1037/U
PRESSURETROL
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L91A1052/U
OPERATING RANGE 5-150 PSI, MID-SCALE T
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L91A1078/U
PRESSURETROL
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L91A1136/U
PRESSURETROL
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L91A1151/U
OPERATING RANGE 5-150 PSI,MID-SCALE THR
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L91A1169/U
CB P/N 817-00251, OPER. RANGE 0-15 PSI,
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L91A1177/U
CB PART NO 817-00234 OPERATING RANGE 10
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L91B1035/U
PRESSURETROL
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L91B1050/U
PRESSURE CONTROL
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L91B1068/U
PRESSURETROL
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