Ph Calibration; Why Calibrate; When Do You Have To Calibrate; Carrying Out Automatic Calibration (Autocal) - Xylem SI Analytics HandyLab 600 Operating Manual

pH value
24
The settings for the temperature are selected in the menu for cali-
bration and measurement settings (see section 7.1.1 S
H
P MEASUREMENTS
The display of the temperature indicates the active temperature measuring
mode:
Tempera- Resolution of the
ture sensor temp. display
yes 0.1 °C
- 1 °C
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?

 Routinely within the framework of the company quality assurance
 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 7.1.1 S
Use one to five buffer solutions of the selected buffer set in any order.
When other buffer sets are used, other nominal buffer values are displayed.
Apart from that, the procedure is identical.
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).
, page 40).
Temp. measurement
Automatic with temperature sensor
Manual
H
ETTINGS FOR P MEASUREMENTS
HandyLab 600
ETTINGS FOR
, page 40).
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