The best air differential pressure device depends on whether you need a sensor for a monitoring system, a mechanical switch, or a handheld measuring tool. The Phidgets ±2 kPa sensor is suited to lower-pressure measurement, while its ±25 kPa model covers a wider range. For HVAC field checks, the YZT digital manometers provide display-based readings; the Tissting switch is best for applications that need a pressure-operated mechanical switch.
| Product | Best suited for | Measurement range |
|---|---|---|
| Phidgets 1136_0 sensor | Lower differential pressures | −2 to +2 kPa |
| Phidgets 1126_1 sensor | Wider pressure range | −25 to +25 kPa |
| Tissting LF32-05 switch | Mechanical pressure switching | 50–500 Pa |
| YZT MT-1380 with 5/16-inch ports | HVAC field measurements | ±20.68 kPa |
| YZT MT-1380 digital manometer | Multi-unit pressure checks | ±20.68 kPa |
Phidgets 1136_0 ±2 kPa Air Pressure Sensor
The Phidgets 1136_0 measures pressure differences between its two ports over a range of −2 to +2 kPa. Its listed resolution is 5 Pascals, and it connects to a Phidgets VINT port or a voltage input.
Best for: Projects measuring relatively low differential pressures where the stated 5-Pascal resolution is useful. It is a sensor intended to connect with compatible monitoring or data-acquisition hardware, rather than a standalone handheld gauge.
Consideration: Its range is narrower than the Phidgets ±25 kPa model. Confirm that your input hardware and required pressure range match before choosing it.
Phidgets 1126_1 ±25 kPa Pressure Sensor
This Phidgets sensor measures the pressure difference between its two ports from −25 to +25 kPa. The listed resolution is 55 Pascals. It connects to a Phidgets VINT port or a voltage input.
Best for: Buyers who need a wider stated measurement range than the ±2 kPa Phidgets sensor offers. It may fit monitoring projects where pressure differences can exceed the smaller sensor’s range.
Consideration: Its listed resolution is 55 Pascals, compared with 5 Pascals for the ±2 kPa model. Choose based on the range and resolution your application requires, and verify interface needs before purchase.
Tissting LF32-05 HVAC Differential Pressure Switch
The Tissting LF32-05 is a mechanical differential pressure switch for air and non-flammable, non-hazardous gases. Its listed measuring range is 50–500 Pa, and the product information states it senses a 20 Pa differential. The medium temperature range is −20°C to 85°C.
Best for: Buyers who need a mechanical pressure switch rather than a sensor that reports readings to electronic equipment. The package lists tubing, pressure conduits, and fixing screws for installation.
Consideration: This is a switch, not a digital manometer or general-purpose data sensor. Check the 8 × 5 mm gas-pipe connection and pressure requirements for your setup.
YZT MT-1380 Manometer With 5/16-Inch Ports
This dual-port digital manometer measures positive or negative pressure and calculates differential pressure using its DIF key. Its listed range is ±20.68 kPa, with stated accuracy of ±0.18% FSO at 25°C and a 0.5-second response time. The built-in temperature sensor measures current temperature.
Best for: HVAC users who want a handheld digital pressure meter with 5/16-inch pressure ports. The product description says the port size fits most gas valves and includes 19-inch silicone tubing.
Consideration: The stated port fit does not establish compatibility with every valve or system. Check the connection dimensions and measurement range for your specific work.
YZT MT-1380 Digital Differential Pressure Gauge
This dual-port YZT meter measures positive and negative pressure and uses a DIF key to obtain differential pressure. Its range is ±20.68 kPa. Listed features include 12 selectable pressure units, zero adjustment, offset, data hold, out-of-range error codes, and maximum and minimum values with relative timestamps. A 9-volt battery is included according to the product name.
Best for: Buyers who want a handheld meter with multiple pressure units and reading-management functions. Its stated accuracy is ±0.18% FSO at 25°C, and its response time is 0.5 seconds.
Consideration: This is a measuring instrument, not a fixed installation sensor or mechanical switch. Confirm that its dual-port setup and range suit the intended measurement.
Buying Guide: How To Choose An Air Differential Pressure Device
Do you need a sensor, switch, or manometer?
Choose a sensor when you need pressure readings to connect with a monitoring or input system. A mechanical switch is intended to respond to a pressure difference as a switching device. A digital manometer is the practical choice for displaying measurements during field checks. These product types are not interchangeable.
What pressure range and resolution do you need?
Compare the expected pressure difference with the product’s stated range. The Phidgets models cover ±2 kPa and ±25 kPa, respectively, while the Tissting switch lists 50–500 Pa. The two YZT meters list a ±20.68 kPa range. For sensors, also compare resolution: the listed Phidgets values are 5 Pascals and 55 Pascals.
Which connections and features matter?
Check port size, tubing, and electrical interface before ordering. The Tissting product lists an 8 × 5 mm gas-pipe connection and installation accessories. The first YZT manometer lists 5/16-inch ports and tubing; the Phidgets sensors require a VINT port or voltage input. For handheld use, consider whether selectable units, data hold, temperature measurement, or a display-based reading method are important.
Frequently Asked Questions
What does an air differential pressure sensor measure?
It measures the pressure difference between two points or ports exposed to air pressure. The size and direction of the difference depend on the sensor and its measurement setup.
Is a differential pressure switch the same as a sensor?
No. A switch responds to a pressure difference mechanically, while a sensor measures pressure for use with an input or monitoring system. A manometer displays readings for a user.
How do I choose between the two Phidgets sensors?
Choose the ±2 kPa model when its narrower range and 5-Pascal resolution fit the application. Choose the ±25 kPa model when the wider range is more important and its listed 55-Pascal resolution is sufficient.
Can a digital manometer measure differential pressure?
Both listed YZT meters have dual ports and a DIF function for obtaining differential pressure. Their stated measurement range is ±20.68 kPa.