Measurement Of Surface Temperature Difference - Ht Instruments Hta107 Bedienungsanleitung

5.4. MEASUREMENT OF SURFACE TEMPERATURE DIFFERENCE

The instrument can use both the in-built sensor (see Fig. 1
–
(see Fig. 1 part 15) to determine whether a surface has a risk of condensation or not.
Do not carry out any measurements in case gas, explosive materials or
flammables are present, or in dusty environments. Do not expose the in-built
sensor to mechanical shocks.
1. Switch on the instrument using key ON/OFF.
2. Use keys  or  to select the measuring unit for temperature (see § 4.3.3).
Fig. 11: Measurement of surface temperature difference
3. Press keys RH% and MOI at the same time to enter the Condensation measuring
mode. The instrument shows the value of dew point temperature measured by the in-
built sensor on the secondary display and indications
display (see Fig. 11
between the value of IRT temperature and dew point temperature.
4. Press key IRT/
temperature is shown on the secondary display for a few seconds and symbol
appears on the display. The instrument behaves as follows:
➢ If IRT temperature is higher than dew point temperature → by more than 14°C
(25°F), temperature difference (IRT-DP) is shown on the main display with no
further indications (see Fig. 11
➢ If IRT temperature is higher than dew point temperature → by 3°C÷14°C
(5°F÷25°F), temperature difference (IRT-DP) is shown on the main display,
indication "
indicate a risk of condensation in the area (see Fig. 11
➢ If IRT temperature is higher than dew point temperature → by less than 3°C (5°F),
temperature difference (IRT-DP) is shown on the main display, indication
appears on the display and the instrument gives out a double sound to indicate a
high risk of condensation in the area (see Fig. 11
5. Press key MODE/ZERO to activate/deactivate the display of steam pressure expressed
" "
in kPA (for temp. meas. unit °C) or in
6. Wait for a steady result on the display and press key MEM/ALM to save the measured
result in the instrument
7. Press key RH% or key MOI to quit Condensation mode.
–
first screen). The main display always shows the difference
to measure IRT temperature on the surface to be tested. The value of
–
" appears on the display and the instrument gives out a sound to
'
s internal memory (see § 4.3.9).
CAUTION
"
COND
second screen).
–
fourth screen).
" "
mBAR (for °F) at the top of the display
EN – 14
–
part 1) and the IRT sensor
" " "
and DEW appear on the
– third screen).
HTA107
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