Diaphragm vacuum switch LF20-V

vacuumNONC

Product overview
The LF20-V vacuum pressure switch is engineered for extended-duty industrial vacuum control and monitoring. It is factory set and provides stable set-point performance. The switch incorporates a fluorosilicone elastomer diaphragm for broad fluid compatibility and offers multiple termination and process connection options, including a Metri‑Pack connector that forms a sealed mating.

Key features

• Fluorosilicone diaphragm for chemical compatibility
• Factory-set pressure range with stable set-point integrity
• Multiple electrical terminations: #8-32 screws, 1/4" blade, Metri‑Pack
• Process connections: 1/8" NPT, 1/4" NPT, G1/8, G1/4 (male)
• Direct-action blade contact switch for simple, repeatable switching
• Compact footprint for easy integration in OEM systems

Technical parameters
Model: LF20-V
Media: Air
Pressure set point: Factory set from 1.1 to 22 in/Hg vacuum
Max operating pressure: 30 in/Hg vacuum
Burst pressure: 150 psi
Operating temperature range: -40℃ to +120℃
Switch type: Direct action, blade contact
Electrical rating (resistive): 15A @ 6VDC, 8A @ 12VDC, 4A @ 24VDC
Electrical rating (inductive): 1A @ 120VAC, 0.5A @ 240VAC
Contact arrangement: SPST — NO or NC options
Terminals: #8-32 screws, 1/4" blade, Metri‑Pack
Connections: 1/8" NPT Male, 1/4" NPT Male, G1/8" Male, G1/4" Male
Materials: Contacts — silver alloy, gold plated; Base — plated steel; Cover — glass-reinforced polyester; Diaphragm — fluorosilicone elastomer
Options: Various base connector sizes; wire leads (potted & sealed)

Variants / ranges

• Number 0 — cover: none
• Number 1 — set point: 1.1–3" Hg (15–41" H2O) ±0.5" Hg; circuit: SPST‑NC; connection: 1/8 NPT; terminals: 1/4" blade; cover A
• Number 2 — set point: 4–8" Hg ±1" Hg; circuit: SPST‑NO; base: plated steel; connection: 1/4 NPT; terminals: #8-32 screws; cover B
• Number 3 — set point: 9–17" Hg ±2" Hg; base: stainless steel; connection: R1/8; terminals: wire leads
• Number 4 — set point: 18–22" Hg ±3" Hg; connection: R1/4
• Number 5 — connection: G1/8
• Number 6 — connection: G1/4

Conversion notes
1 kgf/cm² = 14.2 psi; 1 bar = 14.5 psi; 1 in/Hg = 0.49 psi

Typical applications

• HVAC control and safety interlocks
• Refrigeration systems and leak detection
• Vacuum pump monitoring and control
• Industrial process vacuum sensing and safety

Technical specifications

• Model: LF20-V
• Media: Air (compatible with fluids per diaphragm material)
• Pressure set point: factory set 1.1–22 in/Hg (variant dependent)
• Max operating vacuum: 30 in/Hg
• Burst pressure: 150 psi
• Operating temperature: -40℃ to +120℃
• Switch action: Direct action, blade contact
• Electrical ratings: resistive and inductive values as above
• Contact arrangement: SPST (NO or NC)
• Terminals & connectors: #8-32, 1/4" blade, Metri‑Pack, wire lead options
• Process ports: 1/8" NPT, 1/4" NPT, G1/8, G1/4
• Materials: gold-plated silver alloy contacts; plated steel or stainless base; glass-reinforced polyester cover; fluorosilicone diaphragm