Absolute pressure measurement is the conventional method for measuring pressure in a sealed system, for instance when venting a system with a vacuum pump or evacuating refrigeration systems or heat pumps.
Testo's absolute pressure meter: high-precision measurement, reliable monitoring
- Compact and durable design for protecting the vacuum in the measurement sensor.
- Also for applications in difficult-to-access or aggressive environments.
- Very wide range of possible applications, for example in facility management, refrigeration, air conditioning and ventilation technology, laboratories and production processes.
Absolute pressure meter
with fixed probes
Absolute pressure meter
with connectable probes
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Depending on the application, pressure is measured either absolutely or relatively. In the process, every measured pressure relates to a reference value. With absolute pressure (notation: P abs) the reference value is absolute vacuum (0 bar) which corresponds to the vacuous space in the universe. Absolute pressure, which is not dependent on weather or height, therefore indicates the difference from the vacuum. An absolute pressure measuring instrument has three special features:
- Only one hose connection.
- Only shows positive readings and cannot be zeroed.
- A sealed vacuum in the absolute pressure sensor (reference pressure).
Alongside temperature and humidity, pressure is one of the most important and frequently measured physical measurement parameters. Measurement of the absolute pressure parameter is indispensable in numerous areas of work involving heating engineering, sanitation and air quality in rooms and buildings, but also in process engineering. Whether with a pure absolute pressure meter or in combination with other relevant measurement parameters – you will find the best possible pressure measuring instrument for every application at Testo:
1. Monitoring indoor air quality:
Absolute pressure is only one of many measurement parameters used for the reliable monitoring of indoor air quality. It is advisable to use measuring instruments which combine all the important measurements in one device, for example:
- Air velocity & IAQ measuring instruments
- Multifunction measuring instruments
- WiFi data loggers
- Comfort probes for turbulence measurement.
Here, you will find the appropriate pressure meter for your tasks.
2. Leak detection on air conditioning and refrigeration systems:
If a leak is suspected, a leak detector will trace the leakage quickly and reliably. This means you can immediately restore the cooling capacity and avoid any damage to the system.
3. Evacuating refrigeration systems and heat pumps:
If foreign gases, humidity and oils are removed when evacuating a system, the absolute pressure must also be checked
Small and accurate: measuring instrument with absolute pressure sensor
For engineers with high demands in terms of measurement data, the testo 511 is the first choice absolute pressure meter. In addition to absolute pressure, the handy instrument also measures the barometric altitude and calculates the barometric altitude pressure.
- High-precision: measures absolute pressure with +/-3 hPa.
- Large measuring range: 300 to 1200 hPa.
- Fits in any pocket: small, handy and practical.
- Versatile: ideal for absolute pressure compensation with flow measurements using a Pitot tube.
- Complete: also suitable for barometric measurements (local height above sea level and air pressure at sea level)
Always make sure you use the right pressure sensor. Because otherwise measurement errors may occur with serious consequences. Testo offers you the perfect pressure measuring instrument for every requirement. Measurement of differential pressure is one of the most common measurement parameters in this respect when it comes to air conditioning and heating. With a Testo differential pressure measuring instrument you are ideally equipped for Pitot tube measurement in ventilation ducts, checking filters in air conditioning systems and numerous other applications. Choose the right instrument for you from a multitude of instrument models and optional accessories.
Would you like not just to measure absolute pressure, but all parameters which are relevant to the commissioning, servicing and maintenance of heat pumps and refrigeration systems? A digital manifold means you have numerous functions at your disposal in just one robust and handy instrument. The practical tools measure temperature, automatically calculate superheating and subcooling and can also deal with temperature-compensated leakage testing. And the best thing is: a practical App enables you to monitor the manifold via your smartphone or tablet, save the measurement results or send them by e-mail. Simply smart.