System design
multi EA 4000 Version 01.16 29
Indication principle Alternating current bi-
amperometry
Alternating current bi-
amperometry
Generation principle Anodic silver dissolution Anodic silver dissolution
Generator current Dynamic up to 1 mA Dynamic up to 10 mA
Temperature control to
recommended operat-
ing temperature
18 – 20 °C 18 – 20°C
Layout of the measuring cell
The measuring cell consists of the electrode space, containing the electrolyte solution, and
the stirring block located in the module. At the floor of the electrode space is the generator
anode in the form of a stable silver sheet. The magnetic stirrer runs above the anode.
The cell is sealed airtight with a cover and three knurled-head screws. The two cover lead-
throughs (drill holes) support the combination electrode and a suction olive. The marked
opening has been provided for the amperometric combination electrode. The unmarked
opening is used for the direct injection into the measuring cell or for connecting the suction
olive.
Switching on the chlorine module starts the movement of the magnetic stirring rod in the
measuring cell cup. The preset cell temperature is 20 °C and can be modified as a method
parameter in the multiWin program.
cover
opening for electrode (la-
beled)
opening for olive to connect
a suction hose or direct in-
jection
electrode space with silver
anode
magnetic stirring rod
electrical connection of the
measuring cell
Fig. 11 Layout of the measuring cell
Combination electrode
The combination electrode combines the indicator electrodes (Ag), generator cathode (Pt)
and gas introduction. The generator anode is a round silver blank in the two measuring cell
bodies (see above).
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