Performing Settings - TESTO 425 Instruction Manual

5.4 Performing settings

1
To open configuration mode:
The instrument is switched on and is in measurement

view. Hold, Max or Min are not activated.
Press and hold
>
changes.
- The instrument is now in configuration mode.
You can change to the next function with
You can leave configuration mode at any time. To do
so, press and hold
instrument has changed to measurement view. Any
changes that have already been made in configuration
mode will be saved.
2
To set the area:
Configuration mode is opened, AREA is lit.

Set the cross-sectional area with
>
confirm with
3
To set the absolute pressure:
The absolute pressure is required for the pressure
compensation of the flow velocity measurement value.
The absolute pressure must be measured using a
separate instrument or obtained from the local
weather station.
Configuration mode is opened, HPA or InHG is lit.

Set the absolute pressure with
>
with .
(for approx. 2s) until the display
(for approx. 2s) until the
.
5. Operation 25
.
/ and
/ and confirm