7 Using the product
21
The Pitot tube factor for Pitot tubes is generally the same
and must be entered:
Pitot tubes from Testo, Pitot tube factor: 1.00
Straight Pitot tubes from Testo, Pitot tube factor: 0.67
Air flow velocity matrix 0699.7077, Pitot tube factor: 0.82
For Pitot tubes from other manufacturers, refer to the
instruction manual for the Pitot tube factor or ask your
supplier.
7.4.3. Differential pressure measurement
1. Remove the testo 420 from the measurement base.
2. Connect the hoses to the testo 420 at + and -.
3. Press -> Application -> Pressure only.
4. Carry out the measurement.
5. Press to save the measurement data. Unsaved
measurement data is lost once you carry out the next
measurement.
- The target folder and file name are displayed, confirm with
to save the measurement data under this name and in the
selected folder.
7.5. Saving
A maximum of 99 measurements can be saved in one
folder.
> -> Memory ->
- The folder overview is shown on the display. Create a new
folder via New Folder.
A maximum 100 folders can be created.
Open folder
> Using the arrow keys, navigate to the required folder and press
.
- The selected folder is opened and the individual files are
displayed.
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