pressure switches and 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.
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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
Specifications
Environmental Conditions
- Ambient Temperature Range
- 32 to 150 deg F (0 to 66 deg C)
Actuation, Valve & Motion Control Specifications
- Typical Systems
- Automatic burners, steam heating systems
- Proportioning Range
- Fixed (L91A); Adjustable (L91B) (Throttling)
Overview
- Product Type
- Modulating pressure controller
- Models
- L91A: Fixed range, 1 potentiometer, L91B: Adjustable range, 1 potentiometer, L91D: Adjustable range, 2 potentiometers
Product Overview & Classification
- Primary Function
- Modulating pressure controller for motors/valves in burners or steam systems
Pressure Specifications
- Pressure Range
- 0 to 15 psi, 5 to 150 psi, 10 to 300 psi (up to 2068 kPa)
Inputs, Outputs & Interface Signals
- Potentiometer Resistance
- 140 Ohms (nominal)
Installation & Mounting Specifications
- Mounting Types
- 1/4-18 NPT pipe fitting or surface mount via knockout holes
- Steam trap (siphon loop)
Applications & Compatibility
- Media Compatibility
- Steam, Air, Non-combustible Gases, Non-corrosive Fluids
Material Specifications
- Material
- Steel Case, Clear Plastic Cover
Electrical Specifications
- Maintenance Interval
- Occasional cleaning of potentiometer; avoid solvents or abrasives
Electrical & Signal Specifications
- Electrical Rating
- 24 VAC
Connections & Interfaces
- Electrical Connections
- Internal screw terminals
Control, Logic & Functional Behavior
- Control Class
- Series 90 modulating controller
Mechanical Design, Layout & Construction Options
- Conduit Entries
- 1/2 in. conduit opening
Environmental Conditions
- Ambient Temperature Range
- 32 to 150 deg F (0 to 66 deg C)
Actuation, Valve & Motion Control Specifications
- Typical Systems
- Automatic burners, steam heating systems
- Proportioning Range
- Fixed (L91A); Adjustable (L91B) (Throttling)
Overview
- Product Type
- Modulating pressure controller
- Models
- L91A: Fixed range, 1 potentiometer, L91B: Adjustable range, 1 potentiometer, L91D: Adjustable range, 2 potentiometers
Product Overview & Classification
- Primary Function
- Modulating pressure controller for motors/valves in burners or steam systems
Pressure Specifications
- Pressure Range
- 0 to 15 psi, 5 to 150 psi, 10 to 300 psi (up to 2068 kPa)
Inputs, Outputs & Interface Signals
- Potentiometer Resistance
- 140 Ohms (nominal)
Installation & Mounting Specifications
- Mounting Types
- 1/4-18 NPT pipe fitting or surface mount via knockout holes
- Steam trap (siphon loop)
Applications & Compatibility
- Media Compatibility
- Steam, Air, Non-combustible Gases, Non-corrosive Fluids
Material Specifications
- Material
- Steel Case, Clear Plastic Cover
Electrical Specifications
- Maintenance Interval
- Occasional cleaning of potentiometer; avoid solvents or abrasives
Electrical & Signal Specifications
- Electrical Rating
- 24 VAC
Connections & Interfaces
- Electrical Connections
- Internal screw terminals
Control, Logic & Functional Behavior
- Control Class
- Series 90 modulating controller
Mechanical Design, Layout & Construction Options
- Conduit Entries
- 1/2 in. conduit opening
- Ambient Temperature Range : 32 to 150 deg F (0 to 66 deg C)
- Typical Systems : Automatic burners, steam heating systems
- Proportioning Range : Fixed (L91A); Adjustable (L91B) (Throttling)
- Product Type : Modulating pressure controller
- Primary Function : Modulating pressure controller for motors/valves in burners or steam systems
- Pressure Range : 0 to 15 psi, 5 to 150 psi, 10 to 300 psi (up to 2068 kPa)
- Potentiometer Resistance : 140 Ohms (nominal)
- Mounting Types : 1/4-18 NPT pipe fitting or surface mount via knockout holes|Steam trap (siphon loop)
- Models : L91A: Fixed range, 1 potentiometer, L91B: Adjustable range, 1 potentiometer, L91D: Adjustable range, 2 potentiometers
- Media Compatibility : Steam, Air, Non-combustible Gases, Non-corrosive Fluids
- Material : Steel Case, Clear Plastic Cover
- Maintenance Interval : Occasional cleaning of potentiometer; avoid solvents or abrasives
- Electrical Rating : 24 VAC
- Electrical Connections : Internal screw terminals
- Control Class : Series 90 modulating controller
- Conduit Entries : 1/2 in. conduit opening
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