This manual is the operating manual of testo 552 - Vacuumstick measuring instrument, which mainly introduces the use method, function features and safety precautions of the product.
The Testo 552 is a digital vacuum gauge designed for the precise measurement of extremely small pressures in the vacuum range. It is primarily used to monitor the evacuation of refrigeration systems and heat pumps, allowing users to measure current pressure to assess dehumidification and the removal of foreign matter like oils or gases. The instrument operates in conjunction with a vacuum pump and can be used with a manifold or connected directly to the testo 570 via a MiniDIN cable.
| Vacuum measuring range | 1100 - 0 mbar / 825080 - 0 micron |
|---|---|
| Vacuum accuracy (0 to 1.33 hPa) | up to ±10 micron |
| Operating temperature | -20 to 50 °C / -4 to 122 °F |
| Battery life | 2400 h (2x AA) |
| Protection class | IP 42 |
| Measuring cycle | 0.5 sec |
It is used to monitor the evacuation of refrigeration systems and heat pumps by measuring current pressure.
Incorrect readings may be caused by improper connection, leaky hoses, or the need for field calibration.