Funnel Volume Flow Application; [Funnel Volume Flow] - TESTO 440 Instruction Manual

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4 Operation
- Measuring Type: multi-point/timed avg.
- Volume Flow Unit: m
- Correction Factor: 1% to 200%
In a multi-point measurement, a mean value is calculated from the
individual measuring values.
In a timed average measurement, a mean value is calculated over a
certain period.
Several points can be measured. This generates a timed
average/multi-point total mean value.
2
Use to select the required parameter and make settings.
3
Press or to exit the menu.
Carrying out the measurement
A suitable probe is connected to the testo 440.

1 Remove the protective cap from the probe head.
For measurements in flows with a known direction, the arrow mark on
the probe head must point in the direction of flow.
2 Move the probe into the flow.
3
Align the probe with the assumed flow axis.
4 Read off the readings.
Low flow velocities may result in greater measurement uncertainty
during temperature and humidity measurement.
5 Carry out the measurement and save the measuring values.

4.5.6 Funnel volume flow application

Volume Flow]
A volume flow rate funnel is required to determine the flow rate on ventilation
systems. The measurement can be carried out with a compatible vane probe in
34
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