Measuring Flue Gases; Measuring Pressure - TESTO 325M Instruction Manual

Measurements are carried out with the flue gas probe unless
otherwise indicated.

7.1 Measuring flue gases

Select fuel (See: 6.1 Selecting fuel, P. 15).
1 Insert flue gas probe pipe in the flue gas duct.
2 Begin measurement by pressing
- The pump starts,
displayed .
Use or to change between the different views.
3 End measurement with
- The pump stops and the last readings are retained in the
analyser until the next flue gas measurement.

7.2 Measuring pressure

With this function, you can measure the draught in a flue gas
channel or the flow pressure in gas heaters.
Draught is measured using the flue gas probe.
You will need the pressure set (Part no. 0554 0315) to
measure the gas flow pressure.
Please observe the following when measuring pressure:
It is only possible to measure pressure if the pump is
switched off.
When the pump is switched off, there is still a dynamic
pressure in the hose which first has to be reduced.
Wait approximately 30 s before starting to measure
pressure.
Remove any condensate in the flue gas probe prior to
measuring pressure (shake probe with tip pointing towards
the ground).
Hold flue gas probe in fresh air during the zeroing phase.
Do not change the position of the analyser while measuring
pressure.
Do not change between rechargeable battery/battery
operation and mains operation when measuring pressure;
fluctuations in the current could influence the measured
result.
Reading display: negative symbol stands for negative
pressure, positive sign stands for positive pressure.
7. Measuring
.
flashes and the current readings are
.
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