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.

57 products or recommendations for Differential pressure
  • testo 512 - 0-2000 hPa Pressure Meter 

    Order-Nr. 0560 5129

    The testo 512 0-2000hPa shows the pressure value in an easy-to-read, large, backlit display. Measurement data can be printed on site with date and time as well as minimum and maximum values. 

    • 8 Units Of Pressure 

    • kPa, hPa, Pa, mm H2O,mmHg, psi, inch H2O, inch Hg 

    • Built In Density Compensation 

    • Simlutaneous Display Of Flow & Pressure Values 

  • testo 512 - 0-20 hPa Pressure Meter 

    Order-Nr. 0560 5127

    The testo 512 differential pressure meter is available as four different models. This model has a measuring range from 0….20 hPa and is ideal for measuring pressure differences at filters and for carrying out pitot static tube measurements in air ducts at air flow speeds between 5 and 55 m/s.

    • 8 measurement units to choose from: psi, kPa, hPa, Pa, mm H2O, mmHg, inch H2O, inch Hg

    • 2 air flow units to select from: m/s, fpm

    • Integrated density compensation

    • Backlit display, min/max values, hold function

  • testo 512 - Differential pressure meter for 0…200 hPa

    Order-Nr. 0560 5128

    The testo 512 differential pressure meter is available as four different models. This model has a measuring range from 0…200 hPa and is ideal for measuring pressure differences at filters and for carrying out pitot static tube measurements in air ducts at air flow speeds between 10 and 100 m/s.

    • 8 measurement units to choose from: psi, kPa, hPa, Pa, mm H2O, mmHg, inch H2O, inch Hg 

    • 2 air flow units to select from: m/s, fpm

    • Simlutaneous Display Of Flow & Pressure Values 

    • 2 Measuing Units For Flow m/s, fpm 

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

    Order-Nr. 0560 5210

    The high-precision testo 521-1 differential pressure measuring instrument is ideal for accurate differential pressure measurements in air conditioning and ventilation technology, for instance for pressure drop on filters, checking fans and extractors or for Pitot tube measurements.

    • 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)

    • Multi-point and timed mean calculation

    • 2 probe inputs for additional pressure and temperature probes

  • testo 526-2 - Precise Differential Pressure 

    Order-Nr. 0560 5281

    The testo 526-2 high-precision differential pressure measuring instrument is ideally suited for checking pressure in sensitive industrial processes, thanks to a measuring accuracy of ± 0.05% of final value. Two additional pressure and temperature probes can also be attached.

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    • 2 additional probe inputs for the attachment of optional pressure and temperature probes

  • testo 521-3 - Differential pressure measuring instrument (up to 2.5 hPa)

    Order-Nr. 0560 5213

    The testo 521-3 high-precision differential pressure measuring instrument easily determines even the smallest differential pressures (up to +2.5 hPa). Its high accuracy and a resolution of 0.1 Pa make the instrument ideal for differential pressure measurements in clean rooms or for flue inspections.
     

    • Integrated temperature-compensated differential pressure sensor with accuracy of up to ± 0.5 Pa

    • Calculation of the flow velocity and the volume flow via Pitot tube (optional)

    • Direct zeroing of the display values of pressure probes

    • 2 probe inputs for additional pressure and temperature probes
       

  • testo 512 - 0-2hPa Pressure Meter 

    Order-Nr. 0560 5126

    The testo 512 differential pressure meter is available as four different models. This model has a measuring range from 0-2hPa and is ideal for measuring pressure differences at filters and for carrying out pitot static tube measurements in air ducts at air flow speeds between 2 and 17,5 m/s.

    • 8 measurement units to choose from: psi, kPa, hPa, Pa, mm H2O, mmHg, inch H2O, inch Hg

    • Built In Density Compensation 

    • Simlutaneous Display Of Flow & Pressure Values 

    • 2 Measuing Units For Flow m/s, fpm 

  • testo 521-2 - differential pressure measuring instrument (0.1 % of f.v.)

    Order-Nr. 0560 5211

    The high-precision testo 521-2 differential pressure measuring instrument is ideal for accurate differential pressure measurements in air conditioning and ventilation technology, for instance for pressure drop on filters, checking fans and extractors or for Pitot tube measurements.

    • Integrated differential pressure sensor with an accuracy of 0.1 % of f.v.

    • Calculation of the flow velocity and the volume flow via Pitot tube (optional)

    • Multi-point and timed mean calculation

    • 2 probe inputs for additional pressure and temperature probes
       

  • testo 526-1 - Pressure Meter Industrial 

    Order-Nr. 0560 5280

    Ideal for checking pressure in sensitive industrial processes: the testo 526-1 high-precision differential pressure measuring instrument with a measuring accuracy of ± 0.1% of final value. It also has two probe inputs for additional pressure and temperature probes.

    • Temperature-compensated differential pressure sensor

    • Multi-point and timed mean calculation

    • Built in test menu's to check pressure drops 

    • 2 probe sockets to connect additional probes for measuring pressure, temperature, current/voltage 

  • testo 550 digital manifold kit - with Bluetooth® and set of 3 filling tubes

    Order-Nr. 0563 2550

    The practical kit makes it even easier to work on air conditioning and refrigeration systems: the testo 550 digital manifold, including set of 3 filling tubes, enables you to get down to work straight away! The instrument can be used for 60 refrigerants, calculates superheating/subcooling automatically and can be connected to your smartphone/tablet via the testo refrigeration App. Thanks to the App, the display and documentation of the measurement results are particularly convenient.

    • Extensive accessories included: set of 3 filling tubes, 2 x clamp temperature probes and transport case

    • Automatic superheating/subcooling calculation for 60 refrigerants: no more need for error-prone manual calculations

    • With a practical App: (remote) display, graphical progression display, documentation of readings and refrigerant updates

    • Temperature-compensated leakage test

  • testo 550 - Refrigeration Gauge 

    Order-Nr. 0563 1550

    The Testo 550 refrigeration gauges instantly displays superheat and sub-cooling for up to 60 refrigerants. It also measures high / low side pressures and temperatures. With its free Bluetooth linked App, the Testo 550 opens up new possibilities for efficient analysis and documentation. 

    • 60 Built in refrigerants 

    • Additional 12 month (3 year) product
      warranty with registration 

    • On-site Reporting/ Monitoring Via Testo Refrigeration App 

    • Simplified menu structure 

  • testo 557 digital manifold kit - with Bluetooth® and set of 4 filling tubes

    Order-Nr. 0563 2557

    Practical kit for work on air conditioning and refrigeration systems, as well as on heat pumps: the testo 557 digital manifold, including set of 4 filling tubes, enables you to get down to work straight away! The testo 557 digital manifold fulfils numerous functions in just one instrument: including superheating/subcooling calculation, vacuum measurement and temperature-compensated leakage test. You can also use a practical App to monitor the manifold via your smartphone/tablet and to store the measurement results or send them by e-mail.

    • Extensive accessories included: set of 4 filling tubes, 2 x clamp temperature probes, precise external Pirani gauge for vacuum measurement and transport case
       

    • Calculation of superheating and subcooling in real time for 60 refrigerants: no error-prone manual calculation

    • Connection to smartphone/tablet App: remote monitoring, clever measurement documentation and refrigerant updates

    • Temperature-compensated leakage test, automatic ambient pressure measurement

  • testo 557 set - Digital Refrigeration Gauge with Vacuum probe 

    Order-Nr. 0563 1557

    The testo 557 digital manifold fulfils numerous functions, which are required for working on refrigeration systems and heat pumps, in just one instrument: for example superheating/subcooling calculation, vacuum measurement, temperature-compensated leakage test. You can also use a practical app to monitor the manifold via your smartphone/tablet and store the measurement results or send them by e-mail.

    • 60 Built in refrigerants 

    • External vacuum probe for faster and more reliable evacuation of the system 

    • 4-way valve block with 1/4 in. and 3/8 in. ports 

    • Additional 12 month (3 years) product
      warranty with registration 

  • testo Smart Probes AC & refrigeration test kit - with smartphone operation

    Order-Nr. 0563 0002 02

    The testo Smart Probes AC & refrigeration test kit is ideally suited for testing air conditioning and refrigeration systems and installing them. The large testo HVAC softcase enables the measuring instruments to be conveniently transported and ensures that they are always to hand when they are needed.

    • Fast and simple installation of the testo 549i high-pressure measuring instrument directly onto the pressure connection

    • Low refrigerant loss thanks to hoseless application

    • Automatic calculation of evaporation and condensation temperatures and simple selection from more than 80 refrigerants via testo Smart Probes App

    • Large testo HVAC softcase: store additional testo Smart Probes for further applications in the heating, air conditioning and ventilation field safely

  • testo Smart Probes Refrigeration set - with smartphone operation

    Order-Nr. 0563 0002

    The testo Smart Probes Refrigeration set is ideal for carrying out servicing and troubleshooting on air conditioning and refrigeration systems, as well as for installing them. The robust testo Smart Case enables the measuring instruments to be conveniently transported and ensures that they are always to hand when needed.

    • Low refrigerant loss thanks to hose-free application

    • Quick and easy installation directly at the pressure connection

    • Easy refrigerant selection

    • Automatic calculation of the evaporation and condensation temperature via testo Smart Tools App 

  • testo 549 - Digital manifold for beginners

    Order-Nr. 0560 0550

    The testo 549 digital manifold offers many advantages in comparison with analog manifolds: the instrument will make it easier for you to work on refrigeration systems and heat pumps. With its integrated temperature measurement and automatic calculation of superheating/subcooling, you can now do away with additional measurements and manual comparisons (when using an optional clamp probe). You can also use the manifold for 60 current refrigerants.

    • 60 current refrigerants stored in the instrument

    • Additional 12 month (3 year) product warranty with registration 

    • Large 2-line backlit display 

    • Digital accuracy performs more reliably than analog manifold gauge sets for more precise readings 

  • testo 510 i - differential pressure measuring instrument with smartphone operation

    Order-Nr. 0560 1510

    Handy and intelligent: the compact testo 510i differential pressure measuring instrument featuring professional measuring technology and smartphone operation for measuring differential pressure, air flow velocity and volume flow. Readings can be viewed conveniently on your smartphone/tablet via the testo Smart Tools App and emailed directly. 

    • Measurement of gas flow and static pressure

    • Measurement menu for pressure drop test including alerts

    • Simple configuration and determination of volume flow with Pitot tube

    • Magnetic holder for easy attachment

  • testo 480 - Climate Measurement Tool 

    Order-Nr. 0563 4800

    Air flow measurements in ducts, temperature measurements in laboratories, humidity measurements in production, pressure difference measurements in clean rooms. The Testo 480 climate measurement meter with a wide range of optional probes that allows you to measure, analyse and log these and a variety of other parameters with only one device. 

    • Measure multiple parameters Temperature, Humidity, Pressure Turbulence, Heat radiation, Co2 Lux, PMV/PPD, WBGT 

    • Professional software for reporting & data logging 

    • Highly accurate digital probes 

    • Intelligent calibration concept

  • testo 570-2 - digital refrigeration gauge with data logging 

    Order-Nr. 0563 5702

    The testo 570-2 is a digital 4-way manifold gauge that combines the functions of all the old tools and measuring instruments it can so easily replace. The hvac manifold can measure, analyze and log – among other things – pressure, temperature, electricity and vacuum measurements.

    • 40 refrigerant profiles stored in the instrument 

    • Additional 12 month (3 years) product warranty with registration 

    • Automatic heat pump mode – no need to replace refrigerant hoses 

    • Real time data measurement and graphical editing with EasyKool software 

  • testo Smart Probes heating set - with smartphone operation

    Order-Nr. 0563 0004

    With the Testo Smart Tools Heating set, you can measure and check all heating system temperatures and pressures in conjunction with your smartphone. The robust testo Smart Case enables the measuring instruments to be conveniently transported and ensures that they are always to hand when needed. 

    • Measurement of gas flow and static pressure

    • Non-contact temperature measurement on underfloor heating systems and radiators

    • Measurement menu for pressure drop test, including alerts via testo Smart Tools App 

    • Rapid image documentation with IR temperature readings and measuring spot marking

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