Xylem HandyLab 600 - Manual (Page 24)

pH value HandyLab 600
24 ba77064e01 03/2014
The display of the temperature indicates the active temperature measuring
mode:
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
ETTINGS FOR P H MEASUREMENTS , page 40).
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.
The settings for the temperature are selected in the menu for cali-
bration and measurement settings (see section
7.1.1 S ETTINGS FOR
P H MEASUREMENTS , page 40).
Tempera-
ture 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).