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67
WINDWATCH PRO, il a été essayé d’intégrer cet arrangement
dans un boîtier de sacoche. Le petit orifice avec les 3 contre-
fiches de protection sert à canaliser le vent et pour le laisser
circuler autour du capteur. Le capteur est découplé de façon
thermique, autant que faire se peut dans un boîtier serré. De
ce fait, et en vue d’obtenir le mesurage de température rapide
et pcis, il est conseillé de tenir l’instrument à coulisseau
ouvert dans la direction du vent. En cas d’accalmie il devra
être balancé quelques fois, ou bien tourné dans l’air au bout
d’une ficelle. Si le boîtier n’a pas encore adopté la tempéra-
ture ambiante, vous constaterez qu’aprés l’avoir balancé, la
température ne sera ni montée, ni descendue; et ce selon le
boîtier est plus chaud ou plus froid que son environnement.
Mesurage d’humidité
Le capteur d’humidiinterne et numériquement équilibré
mesure l’humidité relative. Cependant cette humidirela
-
tive dépend fortement de la température du capteur. Etant
donné que la température est influencée par le boîtier, il est
nécessaire de compenser par électronique la différence entre
temperature de boîtier et de l’environnement. Ceci est réalisé
par le petit capteur de température placé dans l’orifice. Le
mesurage d’humidité sera d’autant plus précis et plus rapide
que le capteur de température peut détecter son environne-
ment (voir ci-dessus).
this setup into a bag housing. The small opening with 3
protective ribs is used to channelise the wind and to direct
its flow at the sensor. The sensor is thermally decoupled
as far as is possible inside a narrow housing. In order to
obtain a precise and rapid temperature measuring it is
recommended to hold the instrument into the wind with
open slider, or in case of calm to move it to and fro a few
times, or to swirl it around in the air with its cord. If the
housing has not yet adopted the ambient temperature you
will note that after the swirling around the temperature will
neither raise nor be reduced, depending on whether the
housing is warmer or cooler than the environment.
Humidity Measurement
The internal digitally preadjusted humidity sensor measures
the Relative Humidity. However, this relative humidity is
highly depending on the sensor temperature. Due to the
fact that this temperature is influenced by the housing, the
difference between temperature of housing and ambient
temperature needs to be compensated electronically. The
small sensor positioned directly in the opening is used for
this purpose. The humidity measuring will be effected so
much more precise and also rapid, as the temperature sen
-
sor can measure the environment (see above).
68


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