pH value Multi 9310
30 ba75937e03 12/2011
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5.2 pH calibration
5.2.1 Why calibrate?
pH electrodes age. This changes the zero point (asymmetry) and slope of the
pH electrode. As a result, an inexact measured value is displayed. Calibration
determines and stores the current values of the zero point and slope of the
electrode.
Thus, you should calibrate at regular intervals.
5.2.2 When do you have to calibrate?
z Routinely within the framework of the company quality assurance
z When the calibration interval has expired
5.2.3 Carrying out automatic calibration (AutoCal)
Make sure that in the sensor menu, Buffer menu, the buffer set is correctly
selected (see section 9.1.1 S
ETTINGS FOR PH MEASUREMENTS, page 62).
Use one to five buffer solutions of the selected buffer set in any order.
Below, calibration with Technical buffers (TEC) is described. When other buffer
sets are used, other nominal buffer values are displayed. Apart from that, the
procedure is identical.
Temperature
sensor
Resolution of the
temp. display
Temp. measurement
yes 0.1 °C Automatic with temperature
sensor
- 1 °C Manual
If single-point calibration was set in the menu, the calibration proce-
dure is automatically finished with the measurement of buffer solu-
tion 1 and the calibration record is displayed.
1. Connect the pH sensor to the meter.
The pH measuring window is displayed.
2. Keep the buffer solutions ready.
3. Start the calibration with <CAL>.
The calibration display for the first buffer appears (voltage display).
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