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Data Sheet PDF | Instruction Manual PDF
Description
The Testo 552 is a high-precision digital vacuum gauge engineered for the critical evacuation stage of refrigeration systems, air conditioning units, and heat pumps. This instrumentation asset accurately tracks low-range absolute pressure values and automatically determines the real-time evaporation temperature of water ($H_2O$), ensuring high-efficiency moisture removal. Featuring an integrated Bluetooth interface, it pairs seamlessly with the Testo Smart App for wireless surveillance, advanced data logging, and on-site reporting. Designed for demanding site environments, the unit features a ruggedized IP42 rated housing with physical threshold visualization alarms.
B2B Applications
- HVAC Circuit Dehumidification: Monitoring absolute pressure decay during evacuation protocols to remove moisture, foreign non-condensable gases, and residual oils.
- Heat Pump Integrity Verification: Running automated system holding tests using precise micron metrics to identify slow process leakage loops.
- Digital Maintenance Documentation: Exporting diagnostic system evacuation profiles directly via email or mobile applications for compliance records.
Technical Parameters
| Measuring Range | 0 to 26.66 mbar / 0 to 20000 micron |
| Measurement Accuracy | ±(10 micron + 10 % of mv) within 100 to 1000 micron |
| Resolution Metrics | 1 micron (0 to 1000 micron), 10 micron (1000 to 2000 micron) |
| Maximum Overload Limit | Absolute: 6.0 bar / 87 psi (Relative: 5.0 bar / 72 psi) |
| Protection Index Rating | IP42 |
| Connection Thread Ports | 2 x 7/16" UNF |
Package Contents
- Testo 552 digital vacuum gauge with Bluetooth
- 2 x AA batteries
- Factory calibration protocol and user manual