Manual

4.1 Troubleshooting
768 KFOven 37
4. Troubleshooting, rectification of malfunctions
4.1 Troubleshooting
Problem Remedial action
Large scatter in the
titration results.
• Do not touch sample boat and guide rod with your
fingers. Use holding clamp or fit cut rubber tubing
over your fingers.
• Dry sample boat well before use and store it in a
desiccator.
• Are the molecular sieves of the drying flasks
exhausted? (If the molecular sieves in the flask to
the right are still OK, this can be used as the left
flask. The "freshest molecular sieves" belong in the
right flask.)
• Condensate in the outlet tubing. Increase gas flow
or use 6.1830.000 Heatable Outlet Tubing.
• Gas flow too high so that titrant solution is sprayed
onto the walls of the titration vessel?
• Grind sample before weighing and spread over
sample boat as evenly as possible.
• Has the sample given off all its moisture? Set
"stricter" shut-off conditions on the titrator: Lower
stop drift, higher shut-off delay time.
• Check if all tubing connections are tight.
Drift too high. • Are the molecular sieves of the drying flasks
exhausted? (If the molecular sieves in the flask to
the right are still OK, this can be used as the left
flask. The "freshest molecular sieves" belong in the
right flask.)
• Are the O-rings of the titration cell still OK?
• Is the septum in the screw cap still OK?
• Do not touch sample boat and guide rod with your
fingers. Use holding clamp or fit cut-off rubber tubing
over your finger.
• When working with the oven, reclose cover of the
insert tube as quickly as possible.
Titration times too long. • Use 6.1830.000 Heatable Outlet Tubing.
• Grind sample before weighing and spread over
sample boat as evenly as possible.
• Increase sample temperature.
• Increase gas flow.