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not used, the AP471 S4, AP471 S5 and
AP471 S6 are supplied with a protection
inder that can be screwed on the probe's head.
The procedure is the following: slide the cy-
lindrical shield up till the complete closing of
the air sensor window placed on the top of the
probe. By the AP471 S4, S5 and S6 probes
the protection cylinder closes the probe top.
Place the head of the probe in the airstream to
be measured and press the reset key (<0>).
The notice “null_A, null_B o null_C” will
appear on the commands bar, according to the
input to which the module is connected. Press
the corresponding function key to reset
measurement: any fault (drifts) related to
velocity and flow instantaneous values will be
cleared.
Operation
To reduce battery consumption, upon the in-
strument power on, air velocity and flow indi-
cations are in a stand-by condition and the
message “
Probe STD_BY! <ENTER> to tog-
gle”
will be viewed: the velocity sensor will
not be powered until the <ENTER> key is
pressed. Even during standard working, if
you press <ENTER> alternatively, the current
measurement will be stopped and restarted.
Extend the telescopic shaft as much as necessary, taking care that the cable passes through the
handle without any problem.
Cover the velocity sensor and reset the measurement value, as detailed in the previous paragraph.
Uncover the sensor and position the probe in the airstream to be measured holding the arrow on
the top of the probe parallel to flow, as indicated in the following pictures.
Probe Top
Indicator of Airstream Direction
