Metrohm 896 Professional Detector – Conductivity & Amperometry - Manual (Page 43)

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6 Troubleshooting
2.896.0030 896 Professional Detector – Conductivity & Amperometry
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6 Troubleshooting
6.1 Problems with the hardware
Problem Cause Remedy
Leak sensor
responds. Leaking capillary connec-
tion. Find any leaking capillary connections and seal
them.
Measuring cell leaking. Screw apart the measuring cell and then reas-
semble it.
The amperometric
detector is not rec-
ognized in the soft-
ware. IC system – No connection. ￭ Check the cable connection.
￭ Switch the IC instrument off and on again
(after 15 seconds).
6.2 Problems with the baseline
Problem Cause Remedy
Drift of the baseline. IC system – Thermal equili-
brium not yet attained. Condition the system with the heater switched
on.
IC system – Leak in the sys-
tem. Check capillary connections and seal them.
IC system – Eluent is old
(too much CO
2
).
Apply new eluent.
Pulsing baseline. High pressure pump – con-
taminated valves. Clean valves (see Chapter Handling and main-
tenance in the manual for the IC instrument).
High pressure pump –
defective piston seal. Replace piston seals (see Chapter Handling
and maintenance in the manual for the IC
instrument).
High pressure pump –
Quality of the pump is not
sufficient for the selected
sensitivity. ￭ Use pulsation absorber.
￭ Use a higher-performance high pressure
pump.
￭ Reduce sensitivity.
Measuring cell – Air bubble
in the measuring cell. ￭ Deaerate the measuring cell.
￭ Degas the eluent continuously.