Using The Modular Flue Gas Probe - TESTO 330 Instruction Manual

6 Using the product
Draught / pressure zeroing
The pressure sensors are zeroed when a pressure measuring
function is called up.
6.2.1.2.

Using the modular flue gas probe

Checking the thermocouple
The thermocouple of the flue gas probe must not lie against the
probe cage.
> Check before use. Bend the thermocouple back if necessary.
Aligning the flue gas probe
The flue gas must be able to flow freely past the thermocouple.
> Align the probe by turning it as required.
The tip of the probe must be in the hot spot of the flue gas flow.
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testo 330-1 LL: The flue gas probe must be in the open air
during the zeroing phase / the instrument must not be
pressurised during zeroing!
testo 330-2 LL: The flue gas probe can be in the flue gas
duct even during the zeroing phase, if a separate VT-
sensor is plugged in. The pressure socket of the instrument
must be free (i.e. unpressurized, not closed).