Optex DOS-20 - Page 25

Calibration
25
A zero standard solution is 100 ml of deionized water into
which 5 g or more of sodium sulfite has been added and
completely dissolved.
Remove the sponge used for 1-point
calibration from the calibration container,
and pour the zero standard solution into
the container up until the fill line.
Insert the sensor’s temperature sensor until it is immersed
in the zero standard solution prepared.
Leave this to stand for at least 5 minutes to allow the
temperature to stabilize.
7
8
9
10
Perform the 1st point calibration.
Check that the measurement
value is stable, and press
.
The display changes to the 2nd point
calibration preparation.
6
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Caution
・
Insert the measurement area so that approximately 1 cm is
left between it and the bottom of the calibration container.
・
Insert the sensor so that no bubbles build up on the
measurement area.