Measuring; Preparing For Measurement; Zeroing Phases - TESTO 320 Instruction Manual

6 Using the product
Setting limits:
1. Select limit → [Edit].
2. Set values → [OK].
3. Save changes: [Finished].
6.2.

Measuring

6.2.1.

Preparing for measurement

6.2.1.1.

Zeroing phases

Measuring the combustion air temperature
If no combustion air temperature probe is connected, during the
zeroing phase, the measured temperature of the flue gas probe is
taken as the combustion air temperature.
All dependent parameters are calculated using this value. This
method of measuring combustion air temperature is sufficient for
systems dependent on ambient air.
If a temperature probe is connected, the combustion air
temperature is measured continuously via this probe.
Gas zeroing
When the instrument is switched on, the measurement menu is
opened and the gas sensors are zeroed.
Draught/pressure zeroing
The pressure sensors are zeroed when a pressure measuring
function is called up.
42
The First steps chapter (see First steps, page 24) must
have been read.
The flue gas probe should not be in the flue gas duct during
the zeroing phase.
The flue gas probe must be in fresh air during the zeroing
phase!
The flue gas probe must be in the fresh air during the
zeroing phase / the instrument must not be pressurised
during zeroing.