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3.2
Telescopic pole with sensors
Hot wire sensor
Temperature sen-
sor
Fig. 14: Probe cross-section
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Functional principle
The Wöhler TA 200 measures the flow velocity via a very small hot wire sensor. The
temperature compensation required for precise measurement at different temperatures is
carried out automatically via a separate temperature sensor, which is fitted below the flow
sensor. Both values, flow velocity and temperature, are shown simultaneously on the
display. The telescopic probe enables flexible adaptation to different air duct cross-
sections. Thanks to the flexible gooseneck, the device can also detect leaks in doors or
windows during blower door measurement in accordance with ISO 9972
The measuring device offers various functions for convenient measurement of ventilation
systems:
For simple volume flow measurement, the duct cross-sectional area can be entered
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flexibly on the device.
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For network measurements in air ducts in accordance with EN 16211, the values at
individual measuring points can be recorded in a special measuring mode. The av-
erage of these values is automatically shown on the display. The device can also be
used to carry out time-averaged measurements, in which the averaged value over a
certain period of time is displayed.
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ATTENTION!
When the appliance is not in use, always slide the
protective sleeve over the sensor opening to pro-
tect the sensitive hot wire sensor.
ATTENTION!
Never touch the hot wire and temperature sensor.
Functional principle
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