4.4 Control keys
■■■■■■■■■■■■■■■■■■■■■■
26
■■■■■■■■
912/913/914 Meter
The electrode is in a good range with regard to the limit values set.
The electrode is close to the limit value range.
The limit value range is defined as follows.
■ Slope limit value with an approximation of 1% to the set limit value.
■ Limit value pH(0) with an approximation of 0.1 pH to the set limit
value.
The electrode is outside the limit values.
4.3.4 Sensor status for DO sensors
The sensor quality is indicated with 3 colored graphical elements.
The criteria for the display status are specified in the system as function of
the signal intensity (see chapter 4.7.5, page 48).
The signal intensity is in the correct range.
The signal intensity is in the range of the lower limit value. Order a
replacement cap for the O
2
Lumitrode.
The signal intensity is below the lower limit value. Correct measuring can-
not be ensured anymore.
4.4 Control keys
Keypad
Switching the instrument on or off.
■ To switch on, briefly push the key. The instrument turns on.