Operating the fan anemometer
5.3 Measuring volume flow
5.3.1 Measuring avec funnel
Important Notes:
When measuring the volume flow of a ceiling diffusor or of an axial valve, use the
Wöhler funnel with the twist adjusting device (artikel 4164 or 23501), see accesso-
ries.
Before measuring the outlets of a push-pull-device, check if it works with an axial valve.
In this case use the twist adjusting device.
Fig. 6: Wöhler FA 410/430 with round
funnel attached
It is recommended to use a measurement funnel
when taking measurements at air passages.
A 346 x 346 mm square funnel and a Ø 210 mm
round funnel are available to attach to the fan
anemometer, please refer to the Chapter Acces-
sories.
Insert the fan anemometer into the funnel
clamp.
To secure, slide the lever next to the fan ane-
mometer upwards (indicated by an arrow in
the image opposite).
When the fan anemometer is securely seated in
the clamp it automatically recognizes that a funnel
has been attached. The funnel symbol is shown in
the display.
NOTE!
The readings now automatically take the installed
funnel into consideration for the calculation of the
volume flow.
CAUTION!
When taking measurements, make sure the fan
anemometer is securely seated in the clamp of
the funnel. Only then is the funnel symbol shown
in the display. Measurements undertaken using
the funnel when the funnel symbol is not shown in
the display do not return correct results.
Before beginning air flow measurements,
enter the area of the air outlet in the Setup
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