Metrohm 885 Compact Oven SC - Manual (Page 75)

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885 Compact Oven SC ￭￭￭￭￭￭￭￭ 65
11 Troubleshooting
11.1 885 Compact Oven SC
Problem Cause Remedy
The drift is very high
during conditioning. Molecular sieve of drying
flasks and/or the titration
cell exhausted. Replace the molecular sieve.
The titration cell is leaking. Check seals. If necessary, replace.
The titration time is
too long. The sample is non-homo-
genous. Pulverize the sample or homogenize it before
weighing in.
Moisture not fully expelled. Select more stringent switch-off criteria on the
KF titrator: lower stop drift, higher switch-off
delay time.
Tubing connections leak-
ing. Inspect tubing and replace as necessary.
The results are
spread widely. Molecular sieve of drying
flasks exhausted. Replace the molecular sieve.
Condensate in the heating
tubing. ￭ Dry the tubing.
￭ Reduce the gas flow.
￭ Perhaps lower the oven temperature.
Gas flow too high. Reduce the gas flow.
The sample is non-homo-
genous Pulverize the sample or homogenize it before
weighing in.
Selected gas flow is
not achieved. The system is leaking. Check all tubing connections and drying flasks
for leaks.
Pressure from external gas
supply either too low or
too high. Adjust the gas pressure (max. 0.3 bar).
Pump defective. Contact a service technician.