JBL Permanent CO2 Plus pH Bedienungsanleitung Seite 10

Information for use
Test principle :
An indicating device contains an indicator liquid which is
separated from the surrounding water by an air pocket.
Making use of a trick from physics, the indicator liquid shows
the pH level resulting from the CO
water. This allows a colour value for the correct
content to be calculated. Gases have the characteristic of
balancing their partial pressure (concentration) at boundary
layers between water and gas (in this case water and air).
The same CO
air pocket between the aquarium water and the indicator
solution as is in the water. This partial pressure is also
passed on to the indicator liquid. As a result, after a little
time, the indicator liquid acquires the same pH level from
the CO , as the surrounding water. The indicator changes
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colour according to the pH level. The air pocket is vital for
the pH level to be displayed precisely, as the indicator would
otherwise mix with the surrounding water and fade.
Use as CO
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Independent of the carbonate hardness, the CO
the aquarium can be checked via the pH level arising from
the CO . On the colour scale, three different colour fields
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therefore display the correct colour value for the best CO
levels for three hardness levels. First a CH test should be
used to measure the carbonate hardness in order to select
the right colour field for the aquarium in question. The
hardness levels are shown on the colour fields e.g. if the CH
partial pressure therefore develops in the
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permanent test:
level in the surrounding
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UK
CO
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level in
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