TESTO 338 Instruction Manual page 20

Density gauge
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5 First steps
-
The stability time is started:
runs down.
Switching the instrument off
> Press and hold down
-
Rinse phase begins (pump running, duration 10 s).
-
The instrument switches itself off.
20
During the stability time, the ambient temperature is
measured, which is required for calculating the Bosch
number. To ensure correct Bosch number calculation:
> Only start the Bosch number measurement once the
stability time has elapsed.
For the Filter Smoke Number (FSN) measurement, the
stability time does not necessarily need to have elapsed.
lights up and a 60 s countdown
[
]
until the display goes out.

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