Metrohm 828 IC Dual Suppressor - Manual (Page 30)

3 Operation
828 IC Dual Suppressor/ 8.828.1003 Instructions for Use
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3 Operation
3.1 General information
No eluent should be pumped through the IC Dual Suppressor when it
is switched off, or if an error occurs. Errors are indicated by red LEDs
on the front panel. Faults which may occur during operation affect the
voltage and the vacuum, which may be outside their specified values.
Details can be found in Section 4 Troubleshooting - Problems.
• During the starting sequence of the instrument (Section 3.6.1) wait
until the vacuum LED lights up green before switching on the eluent
pump.
• A pressure sensor in the instrument is used as the on/off switch for
the electrolysis current of the cell. The current will only be switched
on when a defined pressure has been achieved in the system after
the instrument has been switched on, i.e. if no leaks are present. The
"Current" 4 LED lights up green. If the pressure falls below the
preset value for some time then the current will be switched off.
This ensures that current will only be applied to the cell when liquid
is flowing through the suppressor. This means that the 828 IC Dual
Suppressor can remain switched on even when no eluent is flowing
through it without being damaged. However, in such a case we do
recommend that the IC Dual Suppressor is switched off.
• The 828 IC Dual Suppressor is designed for operation with a total
flow rate of between 0.5 and 2.0 mL/min. Operating the suppressor
with flow rates outside this range may either damage it or produce
unsatisfactory results. At flow rates below 0.5 mL/min the built-up
pressure may not be sufficient to switch on the current. This can
cause the suppressor cell to become exhausted. Flow rates above
2.0 mL/min can create an overpressure in the system and alter the
ratio between the eluates at the anode, cathode and detector outlet
of the cell.