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5
HD21AB17
1.
Input for CO
2
calibration.
2.
Backlit graphic display.
3.
ESC
key: It allows to exit from the menu or, in case of a submenu, to exit from the current level
display.
4.
Navigation key
▲
: It allows navigation through the menus. During normal operation, it is used
to select the resetting of the statistical data and to scroll the displayed quantities upwards.
5.
Navigation key
◄
/Func
: It allows navigation through the menus. In normal view, it allows to
display the statistical data: maximum, minimum, and average.
6.
MEM
key: It allows to start and end the recording of data (logging).
7.
Navigation key
▼
: It allows navigation through the menus. During normal operation, it is used
to cancel the resetting of the statistical data and to scroll the displayed quantities downwards.
8.
MENU
key: It allows to enter and exit the instrument’s functioning parameter setting menu.
9.
Navigation key
►
/ Unit
: It allows navigation through the menus. During normal operation, it
changes the unit of measurement of the displayed main quantity.
10.
ENTER
key: In the menu, it confirms the data entered. In normal view, it allows to reset the
statistical data.
11.
ON/OFF-Auto Off
key: It turns the instrument on and off. When pressed together with the
ESC
key, it disables the automatic turn off.
12.
USB
serial port (mini-USB connector).
13.
Power supply input.
14.
Temperature-Humidity sensors.
