HTA105
EN - 9
5.2. MEASURING VOLUMETRIC FLOW RATE AND AIR HUMIDITY
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. Set the measuring unit and the size of the area of the duct to be tested (see § 4.4).
5. Press key
FLOW/TEMP
to select measurement of volumetric flow rate. The symbol
“
FLOW
”
is shown on the display.
6. Press key
UNIT
to select measuring unit
“
CMM
”
or
“
CFM
”
on the secondary display
(see § 4.3.6).
7. Let the protection slide (see Fig. 1
–
part 15) until the sensors are covered and check
that the indication on the main display is
“
0.00
”
. In case it is not, please carry out the
zeroing procedure (see § 4.3.2)
8. If necessary, expand the telescopic probe and position the air speed sensor in a
parallel direction to the air flow as indicated by the arrow found on the top of the probe
itself (see Fig. 7).
9. The value of air speed is indicated on the instrument
’
s main display.
10. The value of air flow rate is indicated on the instrument
’
s secondary display.
11. Press key
FLOW/TEMP
to select measurement of air humidity. The symbol
“
%RH
”
is
shown on the display.
12. The value of air humidity is indicated on the instrument
’
s secondary display.
13. Press key
HLD
to freeze the reading on the display.
14. To use MAX, MIN functions, see § 4.3.8.
