multi EA 5100
Chlorine analysis with the Cl module 5100
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1
6
7
5
2
3
4
Figure 31Lid of the "high sensitive" measuring cell equipped with all electrodes
1 Platinum electrode
2 Silver electrode
3 Gas inlet tube with Teflon screw
connection (for measuring gas)
4 Opening for direct injection, with
plug
5 Sensor electrode
6 Reference electrode
7 Adapter for exhaust connection
Sensor and reference elec-
trodes
The sensor and reference electrode are always inserted into the measuring cell together.
The sensor electrode has a chlorinated sensor pin which is inserted into the measuring
cell, and a gold contact. The sensor pin is touch-sensitive. Scratch protection is applied
to it for storage.
The reference electrode is supplied dry, with no bridging electrolyte. The same acetic
acid electrolyte solution used for the measuring cell is used as a bridging electrolyte. The
bridging electrolyte is applied via the filling opening. The reference electrode is ready for
measurement after a run-in period of approx. 4 h in the measuring cell.
The filling opening of the reference electrode must be open during operation. For short-
term storage, close the filling opening and place the dry protective cap on the electrode.
The openings in the lid of the measuring cell are designed to align the sensor pin of the
sensor electrode toward the diaphragm of the reference electrode.
A pre-amplifier is applied to the reference electrode. Its connection cables connect the
reference electrode with the sensor electrode and with the connection on the detection
module.