Metrohm 899 Coulometer - Manual (Page 101)

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9 Troubleshooting
899 Coulometer
￭￭￭￭￭￭￭￭ 91
Problem Cause Remedy
The parameter Min. rate
is set too low. ￭ Set the parameter Min. rate higher.
￭ Reset the Control parameters to default
values.
The results are
spread widely. The sample is nonhomoge-
nous. ￭ Homogenize the sample if possible.
￭ Possibly use a larger sample size.
The sample addition is
poorly reproducible. ￭ Observe the instructions in chapter 4.3,
page 31.
The drift fluctuates. ￭ Ensure stable drift.
9.2 Miscellaneous
Problem Cause Remedy
No report is printed. The printer is not recog-
nized by the instrument. ￭ Switch the 899 Coulometer off and then
back on again.
￭ Use a hub on the USB connector and con-
nect the printer to the hub.
The printer model is not
compatible. Use a printer which fulfills the required specifi-
cations (see Chapter 10.3.4, page 95).
The USB keyboard
or the PC mouse
does not function. The keyboard or mouse is
not recognized by the
instrument. ￭ Switch the 899 Coulometer off and then
back on again.
￭ Use a hub on the USB connector and con-
nect the keyboard or mouse to the hub.
The keyboard or the mouse
is not compatible. Use a model which fulfills the required specifi-
cations (see Chapter 10.3, page 93).
The display is no
longer readable. The contrast is set incor-
rectly. Adjust the contrast correctly (see Chapter 6.1,
page 62).
Mettler XP balances
send "R" or "O ----"
as ID1. The automatic calibration
of the balance is activated. Deactivate the automatic calibration.
Message 020-511
"Action not possi-
ble" is displayed. The USB flash drive is no
longer connected. 1. Connect the USB flash drive.
2. Switch the instrument off and then back
on again.
The USB flash drive is full. ￭ Use a different USB flash drive.
￭ Delete files with the aid of a PC.