Metrohm 914 pH / Conductometer - Manual (Page 35)

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4 Operation
pH Meter/Conductometer
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4.3.3 Sensor quality for pH electrodes
The sensor quality is indicated with three colored graphical elements.
The criteria for the display status are set in the calibration parameters (see
Chapter 4.7.4, page 42).
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.
4.4 Control keys
Keypad
Switching the instrument on or off.
￭ To switch on, briefly push the key. The instrument turns on.
￭ To switch off, briefly push the key. A message appears and the instru-
ment turns off.
The CAL key starts the procedure to calibrate a sensor.