ELMETRON CX-401, User Manual, Page: 79 / 120

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21.3. Automatic compensation of the atmospheric pressure influence
The concentration of oxygen dissolved in water determined in mg/l
depends directly on the atmospheric pressure value, which means that
10% pressure change causes also 10% oxygen saturation change. The
meter enables automatic compensation with use of build-in atmospheric
pressure sensor. This influence is automatically counted during
measurements in mg/l.
There is a possibility of reading the atmospheric pressure value:
- in the oxygen measuring mode press the button until the
(pressure) symbol appears in the lower row of the LCD, Pic. 39;
- the value of atmospheric pressure in hPa will appear in the upper row;
Pic. 39.
- return to the measuring mode by pressing the button.
In case of measurement in % the atmospheric pressure does not
influence the result.