Electromechanical pressure switch LF20

diaphragmmechanicalrelative

Product overview
The LF20 pressure switch is designed for extended-duty industrial and mobile applications. Factory-set and field-adjustable, it accepts a range of diaphragms for compatibility with air, water and hydrocarbon fluids. Available terminations include Metri-Pack connector, screw and blade terminals. Typical applications: pool & spa, anti-skid braking, water pump systems, dental air compressors, heavy construction, off‑road equipment and general pressure control systems.

Parameters
MODEL: LF20
Media: Air, water, motor oils, transmission oils, jet fuels and similar hydrocarbon media
Pressure set point: Factory set from 0.5 to 150 psi (field adjustable)
Max operating pressure: 150 psi (0.5–24 psi set point range); 250 psi (25–150 psi set point range)
Proof pressure: 500 psi
Burst pressure: 750 psi (0.5–24 psi); 1250 psi (25–150 psi)
Operating temperature range: -40℃ to +120℃
Switch type: Direct action, blade contact
Electric rating: Resistive: 15 A @ 6 VDC, 8 A @ 12 VDC, 4 A @ 24 VDC; Inductive: 1 A @ 120 VAC, 0.5 A @ 240 VAC
Contact arrangement: SPST (N.O./N.C.); single or dual adjustable circuits; N.O./N.O. and N.C./N.C. dual circuits available
Terminal: #8-32 screws, 1/4" blade
Connection: 1/8-27 NPT male
Materials: Contacts — silver alloy (gold plated option); Base — brass; Cover — glass-reinforced polyester; Diaphragm — polyimide film (Teflon or EPDM optional)
Options: plated steel, plastic or stainless steel base; various connector thread sizes; potted & sealed wire leads

Dimensions
Dimension drawings and illustrations available on the product page (see technical drawings for details).

Documents
Certificates and product PDFs available: UL, CE, TUV and product specification.

Features / Technical specifications

• Model: LF20
• Media compatibility: air, water, motor oils, transmission oils, jet fuels and similar hydrocarbons
• Pressure set point: 0.5–150 psi (factory set, adjustable in field)
• Max operating pressure: up to 250 psi depending on set point range
• Proof pressure: 500 psi; Burst pressure: up to 1250 psi depending on range
• Operating temperature: -40℃ to +120℃
• Switch type: direct action with blade contact
• Electrical ratings: resistive and inductive as specified above
• Contact arrangements: SPST NO/NC; single or dual adjustable circuits; NO/NO and NC/NC options
• Terminals and connection: #8-32 screws, 1/4" blade; 1/8-27 NPT male
• Materials and options: silver-alloy contacts (gold plating option), brass base, glass-reinforced polyester cover, polyimide diaphragm; optional Teflon/EPDM diaphragms and alternative base materials