multi EA 5100
Maintenance and care
149
}
Unscrew the connectors for the heated gas transfer line from the sulfuric acid con-
tainer. Remove the thin hose from the container.
CAUTION! Sulfuric acid residue can still be present on the hose.
}
Empty the sulfuric acid via the top opening. Dispose of the sulfuric acid.
}
Rinse the sulfuric acid container and the safety attachment multiple times with ultra-
pure water and then rinse with ethanol or methanol:
}
Rinse hose 20 including the PTFE screw joint with ultrapure water and then with
ethanol or methanol.
}
Dry the cleaned components, e.g., by blowing it through with an inert gas.
}
Place the sulfuric acid container down somewhere safe and fill it with 20 ml of con-
centrated sulfuric acid.
}
Install the filled sulfuric acid container in the detection module in reverse order (→
"Installation"
NOTICE! Ensure the proper fit of the conical nipples when connecting the gas trans-
fer line and the PTFE connectors.
ü
The detection module is ready for operation again.
14.11.2 Maintenance of the measuring cell
WARNING
Risk of chemical burns
The electrolyte solution contains high concentrations of acetic acid.
¡
Wear protective clothing when replacing the electrolyte solution.
¡
Observe all instructions and specifications in the safety data sheet.
ð
For the "sensitive" and "high concentration" measuring cells: Replace the electrolyte
solution daily.
ð
For the "high sensitive" measuring cell: Refill the electrolyte solution daily.
Only replace the electrolyte solution in the event of analytical problem and if crys-
talline deposits form.
}
For replacement of the electrolyte: Empty the measuring cell. Dispose of the elec-
trolyte solution.
}
Rinse the empty measuring cell and the magnetic stirrer first with ultrapure water,
then with ethanol.
}
Carefully wipe the measuring cell and the magnetic stirrer with tissue to remove any
possible silver chloride residue.
}
Fill the measuring cell with fresh electrolyte solution:
"high sensitive" measuring cell: 65 ml
"sensitive" measuring cell: 15 to 20 ml
"high concentration" measuring cell: 120 ml
ü
The measuring cell is ready for operation again.
Also observe the following:
¡
If the detection module is put out of operation for multiple days, clean the measur-
ing cell and store it in a dry place.
¡
Check the casing of the magnetic stirring rod for cracks regularly. If metal ions from
the stirring rod come into contact with the electrolyte solution, they can disrupt the
analysis.
