LEFOO LF31A-SPD 110.2 in/H₂O Air Differential Pressure Switch

Product Name

LEFOO LF31A-SPD 110.2 in/H₂O Air Differential Pressure Switch

Model Number

LF31A-SPD 110.2 in/H₂O

Model-number note: LEFOO's official LF31A ordering system encodes the actuation type, contact configuration, housing/vent configuration, direction, set point and pressure unit. The manufacturer documentation lists in W.C. / inH₂O as an available pressure-unit designation. (LEFOO INDUSTRIAL CO.,LTD.)

Brand

LEFOO

Product Type

Air Differential Pressure Switch / Air Pressure Switch

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Product Details

The LEFOO LF31A is an air differential pressure switch designed to detect low pressure, vacuum or differential-pressure conditions and operate an electrical contact at a predetermined set point.

The LF31A series is designed particularly for HVAC and air-proving applications, as well as gas-fired heating equipment and other systems requiring reliable low-pressure switching. (LEFOO INDUSTRIAL CO.,LTD.)

The specified 110.2 in/H₂O value corresponds to approximately 27.4 kPa using LEFOO's stated conversion of 1 in W.C. = 249 Pa. (LEFOO INDUSTRIAL CO.,LTD.)

Key Features

• Genuine LEFOO LF31A series

• Air differential pressure switch

• Designed for very low pressure switching applications

• Pressure, vacuum and differential-pressure configurations available

• Suitable for air, combustion products and natural gas applications

• Robust diaphragm-operated switching design

• Available with SPST or SPDT contact configurations

• 6.4 mm tube connection

• 6.3 mm copper-alloy terminals

• Designed for HVAC and air-proving applications

• UL353 and CE approvals are listed by the manufacturer for the LF31A series. (LEFOO INDUSTRIAL CO.,LTD.)

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Applications

The LEFOO LF31A pressure switch can be used in:

• HVAC systems

• Air-conditioning equipment

• Ventilation systems

• Air proving systems

• Gas-fired warm-air furnaces

• Gas-fired water heaters

• Air filter monitoring

• Fan and blower systems

• Heating equipment

• Building automation

• Industrial air-pressure monitoring

LEFOO specifically identifies HVAC, gas-fired furnaces and water heaters as applications for the LF31A series. (LEFOO INDUSTRIAL CO.,LTD.)

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Verified Specifications

Specification	LF31A
Brand	LEFOO
Series	LF31A
Product Type	Air Differential Pressure Switch
Media	Air, products of combustion or natural gas
Operating Pressure Range	0.08 to 34 in W.C.
Mounting Position	Diaphragm in any vertical plane
Proof Pressure	100 in W.C. (3.6 psi)
Burst Pressure	5 psi minimum
Operating Temperature	-40°C to +85°C
Contact Arrangement	SPST or SPDT
Terminal	6.3 mm copper alloy
Tube Connection	Ø6.4 mm
Approval	UL353, CE
Pressure Conversion	1 in W.C. = 249 Pa

These specifications are published by LEFOO for the LF31A series. (LEFOO INDUSTRIAL CO.,LTD.)

LF31A-SPD 110.2 in/H₂O Set Point

110.2 inH₂O ≈ 27.4 kPa

However, the exact 110.2 in/H₂O configuration code should be confirmed against the manufacturer's ordering code before ordering, because LF31A model suffixes identify multiple parameters including contact material, actuation method, contact type, housing/vent configuration, pressure direction, set point and unit. (LEFOO INDUSTRIAL CO.,LTD.)

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LF31A Ordering Code

LEFOO's official LF31A documentation identifies the following model-code elements: (LEFOO INDUSTRIAL CO.,LTD.)

Code	Meaning
S / G	Silver / Gold contact material
V / P	Vacuum / Positive pressure
S / C / D	SPST-NO / SPST-NC / SPDT
Housing code	Housing and vent-hole configuration
I / D	Increasing / Decreasing pressure actuation
Set Point	Manufacturer-defined numerical set point
Pa / in W.C. / mbar / inHg etc.	Pressure unit

This means the complete LF31A configuration should be checked carefully rather than treating every LF31A model as electrically or mechanically identical.

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FAQ

What is LEFOO LF31A-SPD 110.2 in/H₂O?

It is an LF31A-series air pressure/differential pressure switch associated with a 110.2 inH₂O pressure setting.

What does inH₂O mean?

inH₂O, also written as in W.C., means inches of water column. It is commonly used for low-pressure measurement in HVAC, gas and air-handling systems. LEFOO specifies 1 in W.C. = 249 Pa. (LEFOO INDUSTRIAL CO.,LTD.)

What is the operating pressure range of LF31A?

LEFOO specifies an operating pressure range of 0.08 to 34 in W.C. for the LF31A series. (LEFOO INDUSTRIAL CO.,LTD.)

What media can the LF31A detect?

The manufacturer specifies air, products of combustion or natural gas. (LEFOO INDUSTRIAL CO.,LTD.)

What type of electrical contacts are available?

The LF31A documentation lists SPST and SPDT configurations, with the detailed ordering code identifying the specific contact configuration. (LEFOO INDUSTRIAL CO.,LTD.)

Where can I buy LF31A-SPD 110.2 in/H₂O in Malaysia?

ASIA-MECH HYDRO-PNEUMATIC (M) SDN BHD supplies hydraulic and pneumatic components in Malaysia and can assist with enquiries for LEFOO pressure switches.

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Related Models

LEFOO LF31A Series

The LF31A series can be configured with different:

• Contact materials

• Vacuum or positive-pressure actuation

• SPST-NO / SPST-NC / SPDT contacts

• Housing and vent configurations

• Increasing or decreasing pressure actuation

• Pressure set points

• Pressure units (LEFOO INDUSTRIAL CO.,LTD.)

Alternative Models

LEFOO LF32 Differential Air Pressure Switch may be considered where an adjustable differential-pressure switch is required. The LF32 is a separate product series with selectable pressure ranges, so compatibility must be checked against the application's required pressure range and switching characteristics. (Lefoo 2000 - 2025)

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SEO Information

Meta Title

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Datasheet / Manufacturer Reference

The official LEFOO LF31A documentation provides the ordering-code structure, dimensions and technical specifications. (LEFOO INDUSTRIAL CO.,LTD.)

LEFOO LF31A Official Product Page
LEFOO LF31A Official Datasheet PDF

ASIA-MECH HYDRO-PNEUMATIC (M) SDN BHD

Hydraulic & Pneumatic Components Supplier — Malaysia

☎ 05-282 1518
📱 WhatsApp: +60 16-550 2288
✉ asiamech88@gmail.com

Delivery: Malaysia, Singapore, Thailand, Indonesia, Philippines, Vietnam, Europe & Worldwide.

For quotation, stock availability and exact LF31A configuration, provide the complete model number and application details to ASIA-MECH.