LF31
LF31 Air Differential Pressure Switch
0.15~34″H2O
| Medium | Air, products of combustion, L.P., or natural gas | |
| Operating Pressure Range | 0.15″ H2O to 34″ H2O | |
| Proof Pressure | 100″ H2O (3.6PSI) | |
| Mounting Position | Diaphragm in any vertical Plane | |
| Operating Temperature | -40°C to 85°C | |
| Contact Arrangement | SPST or SPDT | |
| Electric Rating | Resistance: Initial: <50 milliohms | |
| Current: 100mA minimum, 5A resistive maximum | ||
| Fine silver alloy contacts | ||
| 15mA minimum, 0.5A resistive maximum | ||
| Gold-platinum-silver alloy contacts | ||
| Terminals | 6.3mm or 4.8mm copper alloy | |
| Connection | Ø6.4mm for tube connection | |
| Agency Approval | UL353, CE (EN1854: 2006, 13611: 2000) | |
| Conversion: 1″H2O = 249Pa, 1mbar =100Pa | ||
LF31 switches offer pressure, vacuum, and differential models capable of sensing very low setpoints and switching current up to 5A resistive, and 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 favorite with leading manufacturers of gas-fired warm air furnaces and water heaters.
Smaller and lighter than any other HVAC pressure switch, the LF31 is built for the same temperature range and operating life as conventional switches made of stamped steel.
The LF31 will perform equally well in other applications which demand low OEM unit cost, robust design, setpoint accuracy, and high reliability.
The LF31 features a unique integral snap switch, with positive snap action and self-wiping silver contacts for ultra-reliable switching.
The molded silicone diaphragm converts very low pressure or vacuum into the movement of an actuator disk, which operates the silver alloy contacts.