Metrohm 756 KF Coulometer - Manual (Page 114)

5.2 Error and special messages
756/831 KF Coulometer, Instructions for Use 106
division by zero
The result could not be calculated as a divisor in the formula
was equal to zero.
Exit: Enter appropriate value.
initializing Dosino
When the Coulometer is switched on the connected Dosino is
initialized.
instr.temp.too high
The temperature in the Coulometer is too high ( ≥ 60 °C).
Exit: Wait until temperature is <60 °C.
manual stop
The determination has been manually stopped.
meas.pt list overflow
Maximum 500 measured points can be stored.
Exit: Select larger time interval.
missing EP
An EP needed for calculation in a formula is missing.
no method
The method required by the sample data from the silo memory
is not available in the method memory.
Exit: <CLEAR>.
no new com.var.
The common variable could not be assigned as the result or
the mean value could not be calculated. The old value remains
in force.
no new mean
No new mean value has been calculated as at least one
quantity stipulated for mean value calculations could not be
calculated.
no oven param.
The oven could not be found at the given COM.
Remedy: connect the oven to the given RS-interface of the
Coulometer or set the following in your method under
<PARAM>, >preselections,
Oven: no
.
no titration data
No curve can be printed as no data are available.
not valid
A value is not available.
overrange
The measuring range of ± 2 V has been exceeded. Overrange
replaces the corresponding measured value.
Exit: Rectify error or <STOP>.
overtitrated
In iodine range. The message can also appear after switching
on. Add methanol. If the message appears again:
- Check whether the cables of the indicator and generator
electrodes have been interchanged.
- Improve stirring.
- Exchange reagent.
Exit: Rectify fault or <STOP>.
result out of limits
The result lies outside the limits which were defined in the
method, see page 35.
Exit: Calculate result again or new start.
sample size out
The sample size is outside the limits which are defined in the
method, see page 29.
Exit: Enter new sample size.
sample unfit
The EP has been "overshot" during the titration. The sample
may release an oxidizing agent or the control parameters have
not been set correctly. The result could be incorrect.
service is due
The service interval has elapsed. Contact Metrohm service so
that the Coulometer can be serviced. This message will ap-