ELMETRON CO-505, User Manual, Page: 26 / 60

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User‘s manual for CO-505 dissolved oxygen meter v1.50
8.2. Compensation of the salinity influence
Salinity of the solution decreases the oxygen solubility in water and has to be
taken into consideration during measurements in mg/l. 1 g/l of salinity
change causes about 0.5% of the oxygen saturation change. The meter
enables entering the salinity value in g/l and counts the change of oxygen
saturation in mg/l.
8.3. Manual introduction of the salinity value
The salinity value may be determined on the basis of known conductivity of
the measured solution. Table 1 shows actual dependence between salinity
and conductivity counted in NaCl. In order to enter the salinity value:
- measure conductivity of the solution with any conductivity meter and read
the salinity value from the table;
-
in the oxygen measuring mode press and hold the button till in the
lower row of the LCD the (salinity) sign displays;
-
with the ,
buttons in the upper row of the LCD enter the salinity
value read from the table;
-
enter the oxygen measuring mode by pressing the button.
Measurement in % of saturation does not require entering the salinity
value.