HT Instruments HTA105 Bedienungsanleitung Seite 44

5.2. MEASURING VOLUMETRIC FLOW RATE AND AIR HUMIDITY
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
(see § 4.3.6).
7. Let the protection slide (see Fig. 1
that the indication on the main display is
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
10. The value of air flow rate is indicated on the instrument
11. Press key FLOW/TEMP to select measurement of air humidity. The symbol
shown on the display.
12. The value of air humidity is indicated on the instrument
13. Press key HLD to freeze the reading on the display.
14. To use MAX, MIN functions, see § 4.3.8.
CAUTION
" "
CMM or
–
part 15) until the sensors are covered and check
" "
0.00 . In case it is not, please carry out the
' s main display.
EN - 9
" "
CFM on the secondary display
' s secondary display.
' s secondary display.
HTA105
–
" %RH " is