HTA105
EN - 11
5.3.2. Average value calculated over time
CAUTION
Do not touch not expose the internal sensors found on the top side of the
telescopic probe to mechanical shocks, in order to prevent damaging them.
1. Insert the external probe on the top side by means of the relevant terminal (see Fig. 1
–
part 1). Pay attention to the arrow found on the connector of the probe (see Fig. 7),
which must be directed towards the front side of the instrument
2. Switch on the instrument using key
ON/OFF
.
3. Press key
UNIT
to set air speed measuring unit (see § 4.3.5).
4. Press key
FLOW/TEMP
to select average values of measurements of volumetric flow
rate, air temperature or humidity to be carried out with the same procedure as for air
speed.
5. Press and hold (>2s) key
MEAN
. Symbols
“
Mean
”
and
“
”
and air speed are shown
respectively in the bottom part of the display and on the secondary display, while
symbols
“
0000
”
and
“
mm/ss
”
(timer expressed in minutes/seconds) are shown on the
main display (see Fig. 9
–
left part).
Fig. 9: Average value of speed calculated over time
6. Press key
ENT
to activate the measuring time (range:
1s ÷ 59min, 59sec
) indicated on
the main display, while air speed measurement is running (see Fig. 9
–
middle, referred
to a measuring time of 2min e 53s)
7. Press key
ENT
key again to stop and/or extend measuring time
8. Press key
MEAN
to stop measurement. Symbols
“
Mean
”
and
“
”
flash on the display
and the Average value calculated over time with sample rate of 1s is shown on the
secondary display (see Fig. 9
–
right side)
9. For measuring time over
20 minutes
(see Fig. 9
–
right side) is necessary to disable
the Auto Power OFF feature (see § 4.4)
