ELMETRON CX-401, User Manual

Page: 81 / 120

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To calibrate:
-
place the sensor in the vessel with 0% saturation solution (saturated
sodium sulphite solution);
-
press and hold the button till the moment of appearing the CAL
symbol in the bottom left corner of the display, the meter will enter the
calibration mode and automatically change the unit to % (if it was
previously set to measurement in mg/l O
2
);
-
when the reading stabilises, press the button. The reading will blink,
what will inform about recording the calibration value; at the same time
the corrected reading (0%) will be displayed in the upper row of the LCD;
-
take the sensor out, rinse it accurately with distilled water and leave it
in the air;
- when the reading stabilises, press the button. The reading will blink,
what will inform about recording the calibration value; at the same time
the corrected reading (100%) will be displayed in the upper row of the
LCD;
- return to the measuring mode by pressing the button.
If after pressing the button the meter is unable to detect the value of the
standard solution (0% or 100%), an symbol displays for a moment
instead of the reading (Pic. 40). In such case it is necessary to check the
condition of the membrane in the sensor.
Pic. 40.
In case of choosing the sensor number, entering the calibration mode
and escaping it without making calibration, the stored characteristic
will be erased and a standard characteristic will be adopted.