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Air Differential Pressure Switch LF31

LF31 switches offer pressure, vacuum, and differential models capable of sensing very low setpoints and switching current up to 5A resistive,2.5A inductive. Designed for use in the HVAC industry, where reliable air proving is critical to both performance and customer safety, the LF31 is a favourite with leading manufacturers of gas-fired warm air furnaces and water heaters.

Smaller and lighter than any other differential switch, the LF31 is built for the same temperature range and operating life as conventional switches made of stamped steel. The LF31 features a unique integral snap switch, with positive snap action and self-wiping silver contacts for ultra-reliable switching. The moulded silicone diaphragm converts very low pressure or vacuum into the movement of an actuator disk, which operates the silver alloy contacts.


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Specification of Air Pressure Switch LF31

Model

LF31

Medium

Air, products of combustion, L.P., or natural gas

Operating Pressure Range

0.15" W.C. to 34" W.C.

Proof Pressure

100" W.C. (3.6PSI)

Operating Temperature

-40° C to 85° C

Contact Arrangement

SPST or SPDT

Electric Rating

Resistance: Initial: <50 milliohms

Current: 100mA minimum,5Aresistive maximum

(fine silver alloy contacts);

15mA minimum,0.5Aresistive maximum

(gold-platinum-silver alloy contacts);

Terminals

0.032" x 0.250" copper alloy

Connection

Inlet 0.25" for tube connection

Agency Approval

UL353, CE( EN1854: 2006, 13611: 2000)

Conversion: 1"W.C.(inch water column)= 1 inch/H2O=249Pa 1mbar=100Pa


Features of Air differential Pressure Switch

1. Low OEM unit cost, robust design, setpoint accuracy, and high reliability.

2. Self-wiping silver contacts for ultra-reliable switching.

3. Pressure, vacuum, and differential models capable of sensing very low setpoints.

Application of Air Differential Pressure Switch

The pressure switch control can be used in many types of equipment.

HVAC industry, where reliable air proving is critical to both performance and customer safety, and gas-fired warm air furnaces and water heaters.

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