Differential pressure

As the name implies, differential pressure measures the difference between two pressures. Instruments calculate differential pressure by measuring the disparity between two separate physical spaces. 

For example, when pressure drops on one side of a vent relative to another, the device will recognise this discrepancy.Specifically, differential pressure measurement instruments enable HVAC technicians to deduce the pressure inequality at intake and outflow vents. 
With this insight, professionals can determine whether there's something wrong with the system. Testo's digital pressure instruments possess excellent dynamic performance and low material stress. These features give the device physical stability. Furthermore, our devices have an accuracy of 0.05 per cent. The instrument you choose depends on the demands of your job. 
 
Did you know: The testo 511 absolute pressure meter is ideal for calculating absolute pressure at ducts with assistance from pitot tubes. It serves as an ideal device when measuring density compensation in flow measurement in ducts, laboratories and production processes.

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49 products or recommendations for Differential pressure
  • testo 510 Set

    testo 510 set - differential pressure measuring instrument

    Order-Nr. 0563 0510

    $311.00
    incl. GST  $342.10
    • Differential pressure measurement from 0 to 100 hPa 
    • Flow measurement possible with a Pitot tube (available as an option)  
    Details
  • testo 420

    testo 420 - Differential pressure measuring instrument

    Order-Nr. 0560 0420

    $1 932.00
    incl. GST  $2 125.20
    • Differential pressure measurement, e.g. to check filters in air conditioning and ventilation systems
    • Calculate flow velocity and volume flow using a Pitot tube
    Details
  • testo 521-1

    testo 521-1 - differential pressure measuring instrument (0.2 % of f.v.)

    Order-Nr. 0560 5210

    $1 879.00
    incl. GST  $2 066.90
    • Integrated differential pressure sensor with an accuracy of 0.2 % of f.v.
    • Calculation of the flow velocity and the volume flow via Pitot tube (optional)
    Details
  • testo Smart Probes HVAC/R Ultimate kit

    testo Smart Probes HVAC/R Ultimate kit

    Order-Nr. 0563 0002 32

    • For all measurements involving heating, air-conditioning, refrigeration and ventilation systems
    • All Smart Probes for temperature, pressure, humidity and flow in one kit
  • testo 400 Universal IAQ instrument

    testo 400 - Universal IAQ instrument

    Order-Nr. 0560 0400

    • Smart, intuitive measurement programs including HVAC grid measurement as per EN ISO 12599 and ASHRAE 111, PMV/PPD and turbulence as per EN ISO 7730 and ASHRAE 55
    • High-precision, location-independent and integrated differential pressure sensor
  • testo 510i

    testo 510i - differential pressure measuring instrument with smartphone operation

    Order-Nr. 0560 1510

    • Measurement of gas flow and static pressure
    • Measurement menu for pressure drop test including alerts
  • testo 440 Delta P Air Flow ComboKit 1 with Bluetooth®

    testo 440 delta P Air Flow ComboKit 1 with Bluetooth®

    Order-Nr. 0563 4409

    $3 509.00
    incl. GST  $3 859.90
    • Intuitive: clearly structured measurement menu for volume flow and parallel determination of air velocity, differential pressure, humidity and temperature in ventilation ducts or at ventilation outlets​
    • Smart: simply combine the universal Bluetooth handle with the 100 mm vane or hot wire probe head and the extendable telescope (1.0 m)​
    Details
  • testo 440 Delta P Air Flow ComboKit 2 with Bluetooth®

    testo 440 delta P Air Flow ComboKit 2 with Bluetooth®

    Order-Nr. 0563 4410

    $3 775.00
    incl. GST  $4 152.50
    • Intuitive: clearly structured measurement menu for volume flow and parallel determination of air velocity, differential pressure, humidity and temperature in ventilation ducts, at ventilation outlets
    • Smart: combine the universal Bluetooth handle with the humidity/temperature probe head or extendable telescope (1.0 m). Vane probe heads (Ø 16 mm, Ø 100 mm) can simply be plugged into the telescope
    Details
  • testo 440 Air velocity and IAQ measuring instrument

    testo 440 - Air velocity and IAQ measuring instrument

    Order-Nr. 0560 4401

    $757.00
    incl. GST  $832.70
    • Intuitive: clearly structured measurement menus for volume flow, degree of turbulence, cooling/heating output, mould detection and long-term measurement, such as CO₂
    • Wireless: Bluetooth® probes for extra convenience when measuring and less cable clutter in the measuring case (please order probes separately)
    Details
  • testo 440 dP Air velocity and IAQ measuring instrument including differential pressure sensor

    testo 440 dP - Air velocity and IAQ measuring instrument including differential pressure sensor
     

    Order-Nr. 0560 4402

    $1 022.00
    incl. GST  $1 124.20
    • Intuitive: clearly structured measurement menus for volume flow, K-factor, degree of turbulence, cooling/heating output, mould detection and long-term measurement, such as CO₂
    • Wireless: Bluetooth® probes for extra convenience when measuring and less cable clutter in the measuring case (please order probes separately)
    Details
  • Smart Probes Heating Set

    testo Smart Probes heating kit

    Order-Nr. 0563 0004 10

    • Non-contact temperature measurement, measurement of flow and return temperature as well as gas flow pressure
    • Measurement menu for pressure-drop test including alarm function
  • testo 512-1

    testo 512-1 - Digital differential pressure measuring instrument with App connection

    Order-Nr. 0563 1512

    $831.00
    incl. GST  $914.10
    • Simple, fast and precise differential pressure measurement (0 to 200 hPa) for checking filters and for Pitot tube measurement in the ventilation duct
    • Reliable measurement results due to position-independent differential pressure sensor with high accuracy
    Details
  • testo 6321

    testo 6321 - pressure transmitter for differential pressure

    Order-Nr. 0555 6321

    • Pressure transmitter for measuring differential pressure in the 100 Pa to 2 bar measuring range
    • Magnetic valve for automatic zero-point adjustment guarantees high temperature independent accuracy and long-term stability
  • testo 420

    testo 420 - Air Flow Hood 

    Order-Nr. 0563 4200

    $5 277.00
    incl. GST  $5 804.70
    • 16 measurement points that records Temperature, Humidity, Differential & Absolute Pressure. 
    • Highly precise readings at swirl outlets thanks to flow straightener. 
    Details
  • testo 324 basic set

    testo 324 basic set - Pressure and leakage measuring instrument

    Order-Nr. 0563 3240 70

    • Included in the set: DVGW-tested testo 324 pressure and leakage measuring instrument, including integrated pressure pump, mains unit, system case with feeding unit, connection block and connection hose, manual test pump, adapter for gas boiler test port and ¾” and 1¼” high-pressure stage stops
    • Automatic pressure build-up to 300 mbar by means of an integrated pressure pump; manual test pump for generating higher pressures, e.g. for the 1 bar test
  • testo 512-2

    testo 512-2 - Digital differential pressure measuring instrument with App connection

    Order-Nr. 0563 2512

    $831.00
    incl. GST  $914.10
    • Simple, fast and precise differential pressure measurement with a large measuring range (0 to 2000 hPa)
    • Fast in-app (duct) configuration, graph history, second screen and measurement data memory in the testo Smart App
    Details
  • testo 6351

    testo 6351 - differential pressure transmitter for industry

    Order-Nr. 0555 6351

    • Automatic zero-point adjustment guarantees high temperature-independent accuracy and long-term stability
    • Low measuring range down to 50 Pa ensures very high precision at the lowest pressures
  • testo 6381

    testo 6381 - differential pressure transmitter with flow calculation

    Order-Nr. 0555 6381

    • Automatic zero-point adjustment guarantees high temperature-independent accuracy and long-term stability
    • Low measuring range from 10 Pa ensures very high precision at the lowest pressures
  • testo Sensor LD

    testo Sensor LD basic - Leak detector

    Order-Nr. 8900 0401

    • Its durability and light weight make it convenient to handle and make it easier to work in industrial environments on a day-to-day basis
    • Sound funnel for better detection of leaks
  • testo Sensor LD pro

    testo Sensor LD pro - Leak detector with integrated camera and real image function

    Order-Nr. 8900 0501

    • Easy operation via touchscreen
    • With integrated camera: display and storage of leaks in the image
  • testo 324

    testo 324 - Pressure/gas leak detector

    Order-Nr. 0632 3240

    • Easy to set up, easy to use due to legally compliant measuring menus (i.e. according to TRGI 2018)
    • Extremely accurate and DVGW-compliant measuring results
  • testo 312-4

    testo 312-4 - Differential pressure measuring instrument

    Order-Nr. 0632 0327

    $1 078.00
    incl. GST  $1 185.80
    • Tightness testing and load testing on gas pipes
    • Serviceability testing with air by pressure drop on gas pipes
    Details
  • Hochdruck-Set testo 312-4

    High-pressure set testo 312-4

    Order-Nr. 0563 1328

    $3 130.00
    incl. GST  $3 443.00
  • Hochdrucksonde bis 25 bar

    High-pressure probe - for pressure tests up to 25 bar

    Order-Nr. 0638 1748

    $707.00
    incl. GST  $777.70
    • Pressure tests up to 25 bar 
    • Pressure tests on fluids
    Details
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