HT Instruments HTA105 Bedienungsanleitung Seite 40

HTA105
4.3. DESCRIPTION OF FUNCTION KEYS
4.3.1. ON/OFF key
Pressing key ON/OFF allows turning on/off the instrument. Upon start-up, the instrument
carries out a countdown of 3s before displaying the measuring screen, in order to allow for
'
the internal sensors heating.
4.3.2. Key HLD
Pressing key HLD activates/deactivates function HOLD, i.e. the value of the quantities
measured on both displays is frozen on the main display. The symbol " HOLD " is shown on
the top of the display.
4.3.3. Key /SET
'
Pressing key /SET allows activating/deactivating the display s backlight.
Pressing and holding (>2s) key /SET allows accessing section Settings (see § 4.4). A
new long pressing of the key allows quitting and going back to measuring screen.
4.3.4. Key ENT
Key ENT (ENTER) allows confirming the value of the programmed parameters in section
Settings (see § 4.4).
4.3.5. Key UNIT
Pressing key UNIT allows selecting the measuring unit of air speed shown in the main
display among the options: m/s, ft/min, km/h, MPH, knots. The same key allows
selecting parameters within section Settings (see §4.4).
4.3.6. Key UNIT
Pressing key UNIT allows selecting the measuring unit of air temperature shown on the
secondary display between the options: °C (Celsius) and °F (Fahrenheit), selecting the
measuring unit of air volumetric flow rate between the options: CPM and CMM (see §).
The same key allows selecting parameters within section Settings (see § 4.4).
4.3.7. Key FLOW/TEMP
Pressing key FLOW/TEMP allows selecting measuring units for air temperature (TEMP),
air volumetric flow rate (FLOW) (see § 5.2) and air humidity (%RH) displayed in the
secondary display.
4.3.8. Key MAXMIN
Cyclically pressing key MAXMIN activates the detection of Maximum and Minimum value
of the selected quantities (air speed, temperature, humidity and volumetric flow rate). Upon
each pressing of the key, the secondary display shows the maximum and minimum value
of the quantity, which is dynamically updated and shown together with the symbol
" " " "
associated to the selected function: MAX for maximum value and MIN for minimum
value. Pressing and holding (>2s) key MAXMIN allows quitting the function. The key is not
'
active in the instrument s programming.
4.3.9. Key MEAN
Pressing key MEAN allows activating the function for calculating the average over time
and by spots of the values of the quantities measured by the instrument (air speed,
temperature, humidity and volumetric flow rate) (see § 5.3).
EN - 5