Metrohm 884 Professional VA, Руководство - Краткие инструкции

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6 Troubleshooting
884 Professional VA
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6 Troubleshooting
6.1 List of faults
6.1.1 General problems
Problem Cause Remedy
An electrode cable
has broken.
The cable has accidentally
been jammed in the meas-
uring head cover or a cable
contact has been kinked. Replace the electrode cable set .
Solution is leaking
between the meas-
uring instrument
and the measuring
head. The measuring head is not
correctly locked in place on
the measuring head arm. Let the measuring head snap into place. The
click must be audible.
The sealing rings have
aged or are defective. Contact Metrohm Service.
The electrode test
fails. One or several electrodes
are not connected. Check the electrode cable connections.
One or several electrodes
are defective. Perform maintenance in accordance with the
electrode leaflet. You can find more detailed
information at
http://va-electrodes.met-
rohm.com .
The measuring vessel con-
tains too little solution or is
empty. Check the fill level in the measuring vessel and
add solution if necessary.
The measured val-
ues are widely scat-
tered. The solutions are pipetted
manually. Use an 800 Dosino with dosing unit.
The solutions are not
added via the pipetting
opening. Add solutions only via the pipetting opening .
The solutions are metered
automatically: Tubing con-
nections are not sealed or
the four-way micro dosing
tip for adding standard sol-
utions is not immersed in
the measuring solution. Check the tubing connections and the four-
way micro dosing tip and replace if necessary.