Metrohm 756 KF Coulometer - Manual (Page 113)

5.2 Error and special messages
756/831 KF Coulometer, Instructions of Use 105
5.2 Error and special messages
blinking value The value entered lies outside the permitted range of entries.
Error messages appear in the display as soon as the error has been recognized.
XXX bytes missing
For the storage of a method or a silo line XXX bytes are
missing.
Remedy: <QUIT>. Delete methods no longer needed or use
fewer silo lines.
changing reagent
The reagent monitoring has responded.
Exit: <EXCH> or <CLEAR>. The reagent monitoring counters
are reset to zero.
check drive unit!
The buret is not connected (correctly) or is defective.
Remedy: Rectify fault or <STOP>.
check electrode
The supply to the indicator electrode is interrupted or there is a
short circuit. Possible causes and remedies:
- The electrode is not plugged in ⇒ plug it in
- Too much iodine in titration vessel: Add methanol, exchange
reagent if necessary.
- The electrode is not immersed ⇒ immerse it
- The electrode is broken ⇒ use new electrode
- The electrode cable is broken ⇒ use new cable
The electrode test can be switched off under the key
<PARAM>, >titration parameters.
Exit: Rectify fault or <STOP>.
check exchange unit
The Dosing Unit is not mounted (properly).
Exit: Mount Dosing Unit (properly) so that the coupling
engages or <STOP>.
check generator electr.
There is too high a resistance at the generator electrode:
- Not enough reagent in the titration vessel.
- Gas bubbles when working with the oven: set smaller gas
flow at the oven.
- Reagent exhausted ⇒ exchange.
- The conductivity of the reagent is too low:
Work with a generator electrode with diaphragm and
automatic current switching (<PARAM>, >preselections,
generator I), see also page 33.
- Generator electrode or its cable faulty
Exit: Rectify the fault.
check remote box
The Remote Box is not (correctly) connected or the Remote
Box is connected but not activated under the <CONFIG> key.
Exit: Connect Remote Box (correctly) and set
Remote Box: ON
under <CONFIG>, >peripheral units. Switch the Coulometer
off/on.
D1 overload
The motor of the dosino has reached its limits.
Remedy:
- Clean the dosing unit and check mobility
- Check dosino motor. To do it, install the housing of the
dosing unit and check functionality.