12
1.5.4 Functions of keys on the convertor unit front panel
The pH-meter uses non-locking keys.
Symbols on the light key space show their functions in measurement mode.
Symbols on the dark key space reflect their functions when working with the
electronic scratchpad and display menu.
The green key is used to turn on and off the pH-meter. It is to
be depressed for 2 s.
The key is used:
–
in the measurement mode − to move to the pH-meter
calibration mode. It is to be held depressed for 0.5 s;
–
when working with the electronic scratchpad and display
menu − to move leftward in a line.
The key is used:
−
in the measurement mode − to select mode of pH, pH
25
, U
measurement (out of available modes, see 1.5.8
MENU/
MEASURING MODES
). The key is to be depressed for
0.5 s;
−
when working with the electronic scratchpad and display
menu − to move upward in a line.
The key is used:
–
in the measurement mode − to move from measurement
mode to the mode of viewing data entered into the
electronic scratchpad. It is to be held depressed for 0.5 s;
–
when working with the electronic scratchpad and display
menu − to move rightward in a line.
The key is used:
–
in the measurement mode − to turn on and off display
light;
–
when working with the electronic scratchpad and display
menu − to exit from electronic scratchpad and display
menus.
The key is used:
−
in the measurement mode − to enter the display menu. It
is to be depressed for 0.5 s;
−
when working with the electronic scratchpad and display
menu − to move downward in a line.
CAL
MODE
READ
EXIT
MENU