The best HVAC differential pressure switch is the model whose pressure range and connection style match the system’s requirements. The five options below cover ranges from 20–200 Pa to 1,000–5,000 Pa. The Tissting LF32-02 is best for lower-pressure applications, while the LF32-50 suits much higher pressure differentials. The LEFOO LF32-03 is an alternative for buyers who need a 6.0 mm outside-diameter hose connection.
| Product | Listed pressure range | Notable distinction |
|---|---|---|
| Tissting LF32-02 | 20–200 Pa | Lower range; 8×5 mm gas pipe connection |
| Tissting LF32-03 | 30–300 Pa | 10 Pa sensing differential |
| LEFOO LF32-03 | 30–300 Pa | 6.0 mm OD hose connection |
| Tissting LF32-05 | 50–500 Pa | Midrange option |
| Tissting LF32-50 | 1,000–5,000 Pa | Highest listed range |
Tissting LF32-02: Best For Lower Pressure
This mechanical Tissting switch has a listed measuring range of 20–200 Pa and senses a 10 Pa differential. It is designed for air and non-flammable, non-hazardous gases, with a stated medium temperature range of -20°C to 85°C. The connection is listed as an 8×5 mm gas pipe connection.
Best for: Buyers whose system calls for a lower pressure range and whose installation matches the stated connection. It was selected as the lowest-range option in this group. The package includes tubing, two pressure conduits, fixing screws, and matching screws.
Check before choosing: The listed range may not suit systems that need a higher switching pressure. Confirm the required set point and connection dimensions before ordering.
Tissting LF32-03: Best For 30–300 Pa
The Tissting LF32-03 is a mechanical air pressure switch with a stated 30–300 Pa measuring range and 10 Pa sensing differential. Its listed medium temperature range is -20°C to 85°C, and the connection is an 8×5 mm gas pipe connection. The included package has tubing, two pressure conduits, four conduit fixing screws, and three matching screws.
Best for: Buyers seeking a 30–300 Pa range with the listed 8×5 mm connection. This model offers a useful middle choice between the LF32-02 and LF32-05 pressure ranges.
Check before choosing: The included fixing-screw count differs from some other listed packages. Confirm the connection and required accessory quantity for the installation.
LEFOO LF32-03: Best For 6.0 Mm Hose
This LEFOO-branded LF32-03 has a listed range of 30–300 Pa and a 10 Pa sensing differential. It is a mechanical switch for air and non-flammable, non-hazardous gases, with a stated medium temperature range of -20°C to 85°C. Unlike the Tissting LF32-03, this listing specifies a 6.0 mm outside-diameter hose connection.
Best for: Buyers who need the 30–300 Pa range and a 6.0 mm OD hose connection. It was selected as a connection-style alternative to the Tissting model.
Check before choosing: Do not assume that a 6.0 mm OD hose connection matches an 8×5 mm gas pipe connection. Verify the fitting requirements for your equipment.
Tissting LF32-05: Best For Midrange Pressure
The LF32-05 is a mechanical switch with a listed measuring range of 50–500 Pa and a 20 Pa sensing differential. It is specified for air and non-flammable, non-hazardous gases. The product information lists an 8×5 mm gas pipe connection and a medium temperature range of -20°C to 85°C. Accessories include tubing, two pressure conduits, and screws.
Best for: Buyers who need a higher range than the LF32-02 or LF32-03 provide, but do not need the LF32-50’s much higher range. Its 50–500 Pa specification makes it the midrange choice among these products.
Check before choosing: Its stated sensing differential is 20 Pa, rather than the 10 Pa listed for the two LF32-03 models. Match this specification to the system’s requirements.
Tissting LF32-50: Best For Higher Pressure
The Tissting LF32-50 has the highest listed range in this comparison: 1,000–5,000 Pa, with a stated 250 Pa sensing differential. It is a mechanical model for air and non-flammable, non-hazardous gases. The listed connection is 8×5 mm, and the medium temperature range is -20°C to 85°C. Tubing, pressure conduits, and fixing screws are included.
Best for: Buyers whose application specifically requires a much higher pressure range. It was selected because its range is substantially above the other four options.
Check before choosing: This range is not interchangeable with the lower-range models. Avoid choosing it if the system requires a set point below its listed 1,000 Pa lower bound.
Buying Guide: How To Choose An HVAC Differential Pressure Switch
What pressure range does the system require?
Start with the system’s required pressure differential and switching point. Compare that requirement with the listed ranges: 20–200 Pa, 30–300 Pa, 50–500 Pa, or 1,000–5,000 Pa. A broader or higher range is not automatically better; the switch needs to match the application. Check the equipment documentation or ask a qualified HVAC technician if the required set point is unclear.
Which connection should you verify?
Most products here list an 8×5 mm gas pipe connection. The LEFOO LF32-03 instead lists a 6.0 mm outside-diameter hose connection. These descriptions should not be treated as identical. Confirm the dimensions and fitting style required at the installation point before selecting a switch.
Does the medium and temperature specification fit?
The listed models are intended for air and non-flammable, non-hazardous gases. Their stated medium temperature range is -20°C to 85°C. Do not assume these specifications cover other gases or conditions. Select a product only if its stated medium and temperature limits fit the application.
What accessories are included?
Package descriptions generally include the switch, tubing, pressure conduits, and installation screws. Accessory counts vary: for example, the Tissting LF32-03 listing specifies four conduit fixing screws, while other listings specify five. Review the product’s package details and confirm that the supplied parts suit the planned installation.
Frequently Asked Questions
What does an HVAC differential pressure switch do?
It responds to a difference in pressure between two points. The specific switching range and connection must suit the HVAC application.
Which model has the lowest listed pressure range?
The Tissting LF32-02 has the lowest listed range in this selection, at 20–200 Pa.
Which product has the highest listed pressure range?
The Tissting LF32-50 is listed for 1,000–5,000 Pa, the highest range among these five products.
Are the two LF32-03 switches identical?
Both list a 30–300 Pa range and 10 Pa sensing differential. Their listed connection descriptions differ: the Tissting model specifies an 8×5 mm gas pipe connection, while the LEFOO model specifies a 6.0 mm OD hose connection.
Can these switches be used with any gas?
No such broad compatibility is stated. The product details specify air and non-flammable, non-hazardous gases, so verify suitability for the actual medium before use.