ELMETRON CX-401, User Manual, Page: 36 / 120

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User‘s manual for CX-401 multifunction meter v6.0x
The values between the points given in the table are approximated linearly by
the meter.
The values of standard solutions prepared according to the norm may differ
from its values at the third decimal place. In case of very accurate
measurements it is possible to make a correction of the factory settings and
introduce the value given by the standard’s producer. The meter enables
changing the standard value differing in range of ±0.010 pH from the table
values for 20
0
C (Table 2). The procedure of introducing changes in standard
values is the same as for entering the buffers‘ values. In case of differences
greater than ±0.010 pH it is recommended to perform calibration in buffers
which enables entering a freely chosen solution value to the meter‘s memory.
When the electrode is calibrated, it is possible to calibrate two another
electrodes, choosing the remaining electrode numbers.
After choosing the electrode number, entering the calibration mode and
escaping it without performing calibration, the stored characteristic will
be erased and the standard characteristic will be adopted.
8.5. Calibration with manual temperature compensation
In order to start calibration with manual temperature compensation,
disconnect the temperature probe, what switches the meter to manual
compensation. The display shows the temperature value introduced by the
user, not the one measured with the probe. The , buttons are
unlocked to enter the temperature of the solution. This value is displayed in
the lower row of numbers on the display. Next, connect the pH electrode to
the meter and act according to the description from the previous section.
Note: pressing both , buttons simultaneously sets the
temperature to 20
0
C.