ELMETRON CX-401, User Manual

Page: 31 / 120

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Each of the calibration points has a different range for entering the pH
buffers’ values. This limitation enables the meter to recognise the buffer
solutions automatically. Table 1 contains the manufacturer’s settings of the
values of pH buffer solutions used for calibration, which may be changed
according to the ranges given in this table. The range of introducing these
changes is wide for each of the calibration points, what enables using buffer
solutions of pH values differing significantly from these set by the
manufacturer. In every case the meter will automatically detect the
introduced solution.
Table 1
Calibration point Factory value Range of changes
1 2,000
0,800
÷
2,100
2 4,000
3,900
÷
4,100
3 7,000
6,800
÷
7,100
4 9,000
8,900
÷
10,200
5 12,000
11,800
÷
14,000
The meter recognises only the pH buffers values detected during calibration.
The pH values stored in unused calibration points do not affect the calibration
results.
During next calibrations there is no need to perform the actions
described above, unless the buffer solutions are changed to buffers of
different values. The pH values introduced to the meter’s memory by the
user are stored in non-volatile memory.
The manufacturer gives information about the pH values of the solutions at
different temperatures. This data may be useful for calibrating the electrode
in temperature other than 20 oC by introducing the value of the buffer
corresponding to its value in this temperature to the meter’s memory.
There is no possibility to enter pH values in ranges other than those given in
the table 1.