pressure switches and gauges
Pressuretrol® Limit controllers L4079A, B, W, L604N
High pressure limit switch suitable for steam, air, non-combustible gases, and fluids noncorrosive to the sensing element.
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Overview
The L4079A,B, and W PressureTrol® Limit Controls are high pressure limit switches that break electrical circuits when pressure rises to a preset value. The L4079A and B can be used with steam, air, noncombustible gases, and fluids noncorrosive to the sensing element. L4079W is for use on oil burner systems.
Features & Benefits:
Features & Benefits:
- L4079A has two ganged spst switches; breaks two circuits (may be both sides of the power supply) simultaneously
- L4079B has one spst switch
- L4079W is the same as L4079B but has seals for oil applications
- MICRO SWITCH® snap-acting switches are visible through transparent cover
- Switches open automatically but must be reset manually
- Trip-free reset mechanisms do not permit the limiting role of the PressureTrol® Control to be defeated by jamming the reset lever
- Control does not need leveling
- The L4079 is unaffected by moderate vibration
Specifications
Overview
- Models
- L4079A, L4079B, L4079W
- Product Type
- High‑pressure limit control
Pressure Specifications
- Maximum Diaphragm Pressure
- Up to 350 psi (2410 kPa) depending on model
- Pressure Range
- 10 to 150 psi (70 to 1035 kPa)
- 2 to 15 psi (15 to 100 kPa)
- 20 to 300 psi (140 to 2070 kPa)
- 5 to 50 psi (35 to 350 kPa)
Environmental Conditions
- Ambient Temperature Limits
- Max 150 deg F (66 deg C)
Electrical Specifications
- Maintenance Interval
- Manual reset and annual function check recommended
Applications & Compatibility
- Media Compatibility
- L4079A, L4079B: Steam, Air, Non‑Combustible Gases, Non‑Corrosive Fluids
- L4079W: Oil Burner Systems
Measurement, Media & Physical Properties
- Differential Range
- 3 to 60 psi (20.7 to 413.7 kPa) depending on model
Electrical & Signal Specifications
- Electrical Rating
- 120 VAC: 9.8 A (Full Load), 58.8 A (Locked Rotor)
- 240 VAC: 4.9 A (Full Load), 29.4 A (Locked Rotor)
Control, Logic & Functional Behavior
- Control Functions
- Safety limit (manual reset)
Mechanical Design & Adjustment Characteristics
- Adjustment Method
- External screw; scale in psi and kPa
Product Overview & Classification
- Primary Function
- Breaks electrical circuit on pressure rise
Installation & Mounting Specifications
- Mounting Types
- 1/4-18 NPT pipe fitting
- Boiler, wall, or remote mounting
Software, Configuration & Cyber
- Configurations
- L4079A: Two ganged SPST switches (breaks two circuits)
- L4079B: One SPST switch (breaks one circuit)
- L4079W: One SPST switch with oil‑resistant seals
Actuation, Control & Motion Characteristics
- Switch Action
- Opens circuit(s) on pressure rise
- Switch Type
- MICRO SWITCH® snap‑acting
Safety, Protection & Reliability
- Reset Type
- Manual reset (trip‑free)
Standards & Certifications
- Approvals
- UL Listed (MP466), CSA Approved (LR95329), WEEE Directive 2012/19/EU compliant
Overview
- Models
- L4079A, L4079B, L4079W
- Product Type
- High‑pressure limit control
Pressure Specifications
- Maximum Diaphragm Pressure
- Up to 350 psi (2410 kPa) depending on model
- Pressure Range
- 10 to 150 psi (70 to 1035 kPa)
- 2 to 15 psi (15 to 100 kPa)
- 20 to 300 psi (140 to 2070 kPa)
- 5 to 50 psi (35 to 350 kPa)
Environmental Conditions
- Ambient Temperature Limits
- Max 150 deg F (66 deg C)
Electrical Specifications
- Maintenance Interval
- Manual reset and annual function check recommended
Applications & Compatibility
- Media Compatibility
- L4079A, L4079B: Steam, Air, Non‑Combustible Gases, Non‑Corrosive Fluids
- L4079W: Oil Burner Systems
Measurement, Media & Physical Properties
- Differential Range
- 3 to 60 psi (20.7 to 413.7 kPa) depending on model
Electrical & Signal Specifications
- Electrical Rating
- 120 VAC: 9.8 A (Full Load), 58.8 A (Locked Rotor)
- 240 VAC: 4.9 A (Full Load), 29.4 A (Locked Rotor)
Control, Logic & Functional Behavior
- Control Functions
- Safety limit (manual reset)
Mechanical Design & Adjustment Characteristics
- Adjustment Method
- External screw; scale in psi and kPa
Product Overview & Classification
- Primary Function
- Breaks electrical circuit on pressure rise
Installation & Mounting Specifications
- Mounting Types
- 1/4-18 NPT pipe fitting
- Boiler, wall, or remote mounting
Software, Configuration & Cyber
- Configurations
- L4079A: Two ganged SPST switches (breaks two circuits)
- L4079B: One SPST switch (breaks one circuit)
- L4079W: One SPST switch with oil‑resistant seals
Actuation, Control & Motion Characteristics
- Switch Action
- Opens circuit(s) on pressure rise
- Switch Type
- MICRO SWITCH® snap‑acting
Safety, Protection & Reliability
- Reset Type
- Manual reset (trip‑free)
Standards & Certifications
- Approvals
- UL Listed (MP466), CSA Approved (LR95329), WEEE Directive 2012/19/EU compliant
- Models : L4079A, L4079B, L4079W
- Maximum Diaphragm Pressure : Up to 350 psi (2410 kPa) depending on model
- Ambient Temperature Limits : Max 150 deg F (66 deg C)
- Maintenance Interval : Manual reset and annual function check recommended
- Media Compatibility : L4079A, L4079B: Steam, Air, Non‑Combustible Gases, Non‑Corrosive Fluids|L4079W: Oil Burner Systems
- Differential Range : 3 to 60 psi (20.7 to 413.7 kPa) depending on model
- Electrical Rating : 120 VAC: 9.8 A (Full Load), 58.8 A (Locked Rotor)|240 VAC: 4.9 A (Full Load), 29.4 A (Locked Rotor)
- Control Functions : Safety limit (manual reset)
- Adjustment Method : External screw; scale in psi and kPa
- Primary Function : Breaks electrical circuit on pressure rise
- Pressure Range : 10 to 150 psi (70 to 1035 kPa)|2 to 15 psi (15 to 100 kPa)|20 to 300 psi (140 to 2070 kPa)|5 to 50 psi (35 to 350 kPa)
- Mounting Types : 1/4-18 NPT pipe fitting|Boiler, wall, or remote mounting
- Configurations : L4079A: Two ganged SPST switches (breaks two circuits)|L4079B: One SPST switch (breaks one circuit)|L4079W: One SPST switch with oil‑resistant seals
- Switch Action : Opens circuit(s) on pressure rise
- Product Type : High‑pressure limit control
- Switch Type : MICRO SWITCH® snap‑acting
- Reset Type : Manual reset (trip‑free)
- Approvals : UL Listed (MP466), CSA Approved (LR95329), WEEE Directive 2012/19/EU compliant
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