New Product - Testo 552 digital vacuum gauge

Friday, March 15, 2013


The testo 552 digital vacuum gauge is a new addition to the extensive testo product range and is perfect for the evacuation of refrigeration systems and heat pumps during commissioning, service and maintenance.

These days, many spheres of life would be unthinkable without digital technology. The refrigeration industry is no exception. Yet analogue manifolds are still widely in use in refrigeration technology. According to numerous studies, among other conducted by the US government organisation "Energy Star", up to 74% of all refrigeration systems are incorrectly configured using analogue measuring technology. It is inaccurate, inconvenient to handle, and requires the user to interpret the measurement results.

testo 552 is the only digital vacuum gauge whose absolute pressure sensor needs no further servicing, unlike other sensor technologies. Yet it still consistently delivers highly accurate readings. Its battery life of up to 2,400 hours, with two standard AA batteries, means that you can use the testo 552 for 100 days' continuous operation without having to change the battery. Its robust construction makes it ideal for everyday use, protected against dirt and water.

The testo 552 comes fantastically well equipped with features including:

  • Fold-out robust hook suspension device, making it easy to attach the testo 552 to pipelines, for example.
  • MiniDin connector for connection to the testo 570 digital manifold via connecting cable (0554 5520).
  • Battery level display - supplied with two standard AA batteries with a life of up to 2,400 hours (100 days' continuous operation).
  • Temperatures - Evaporation temperature of water (H2O), ambient temperature and the temperature difference DeltaT are displayed.
  • Absolute pressure - Clear display of the absolute pressure value measured.
  • Display illumination makes it easy to read off the data, even in dark surroundings.

Technical data for testo 552:

Vacuum measuring range 1100 - 0 mbar / 825080 - 0 micron
Sensor overload absolute: 6 bar / 87 psi (relative: 5 bar / 72 psi)
Vacuum resolution 0.01 hPa / 10 micron
Vacuum precision 0 to 1.33 hPa / 0 to 1000 micron: up to ±10 micron
0 to 200 hPa / 0 to 150000 micron: ± 0.3% FS = ±0.6 hPA
200 to 1100 hPa / 150000 to 825080 micron: ±0.3% FS = ±3.3 hPa
Operating temperature -20 to 50 °C / -4 to 122 °F
Battery life 2,400 h (2x AA), (approx. 130 h with background illumination activated)
Protection class IP 42
Parameter mmHg, Torr, mbar, hPa, micron, inH20, inHg, Pa
Measuring cycle 0.5 sec
Sensors 1 x absolute pressure sensor
Connections - 2x 7/16“ UNF
- 1x MiniDin (testo 570)