Maintenance and care
multi EA 5000
152
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Replace the sulfuric acid daily. High sample throughput may require more frequent
replacement.
}
Exit the multiWin software and switch off the analysis system. Switch of the detec-
tion module via the switch on the rear of the device.
}
Allow the heated gas transfer line to cool or wear heat-proof gloves when replacing
the sulfuric acid.
CAUTION! Risk of burns at the ends of the heated gas transfer line! The ends can
achieve temperatures of up to 100 °C during operation.
}
Remove the banjo bolt from the connector, separating the heated gas transfer line
from the sulfuric acid container.
}
Disconnect the PTFE connection and remove hose 20 from the safety attachment.
}
Pull the sulfuric acid container with its remaining components out of the holding
clamps and remove it from the module.
Attach the sulfuric acid container to a secure stand.
}
For the "high sensitive" measuring cell: Remove the gas inlet tube from the detection
module with PTFE screw joint and hose 20.
}
Remove the safety attachment from the sulfuric acid container.
NOTICE! The bases of the PTFE screw joints remain on the safety attachment, the
hose and the gas inlet tube.
}
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 all of the sulfuric acid into a beaker via the drain cock. 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.
}
Close the drain cock on the sulfuric acid container. Insert a funnel into the container.
Fill the sulfuric acid container with 15 ml of concentrated sulfuric acid.
}
Install the filled sulfuric acid container in the detection module in reverse order (→
"Installation"
60).
NOTICE! Ensure the proper fit of the conical nipples when connecting the gas trans-
fer line and the PTFE connectors.
}
For leak protection: Place the beaker and a petri dish under the sulfuric acid con-
tainer in the detection module.
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.
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Wear protective clothing when replacing the electrolyte solution.
¡
Observe all instructions and specifications in the safety data sheet.
