TESTO 320 basic, Instruction Manual

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6 Using the product
34
Gas zeroing
When the instrument is switched on, the measurement menu is
opened and the gas sensors are zeroed.
The flue gas probe must be in fresh air during the zeroing
phase!
Draught/pressure zeroing
The pressure sensors are zeroed when a pressure measuring
function is called up.
The flue gas probe must be in the fresh air during the
zeroing phase / the instrument must not be pressurised
during zeroing.
6.2.1.3. 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 centre of the flue gas flow.
> Align the flue gas probe in the flue gas duct so that the tip is in
the core current (area of the highest flue gas temperature).