TESTO 550i - Page 18

8 Using the product
18
Before each measurement, check that the refrigerant hoses are in
perfect condition.
Before each measurement, zero the pressure sensors. All connections
must be pressureless (ambient pressure). Press the button [▲] (P=O)
for 2 seconds to zero the sensors.
WARNING
The measuring instrument being dropped or any other comparable mechanical
stress may cause breakage of the pipe pieces in the refrigerant hoses. The
valve positioners may also suffer damage, causing further damage inside the
measuring instrument that is not necessarily visible externally!
> For your own safety, return the measuring instrument to the Testo Customer
Service for technical inspection.
> Therefore, always replace the refrigerant hoses with new ones after the
measuring instrument is dropped or after any comparable mechanical stress.
1
Click on Measure.
2
Click on Refrigeration.

The Refrigeration measurement menu opens.
3
Click on .

Configuration menu opens.