UTILITY PANEL
Occasionally it may be necessary to use oversize columns in the CC-5 compartment. The
large side slots provide some access, but if you need a larger opening, the rear Utility Panel
may be removed. The four screws should be put back into the CC-5 and retightened to
maintain the strength of the rear panel. This panel is also removed when an LC-23C car-
tridge-column heater is installed. We advise leaving the Utility Panel in position whenever
possible since it provides continuity of shielding against radio-frequency interference.
4.4 Routine Operating
Procedure
Normal Startup
1.
Be sure no bubbles are present in the thin-layer region or reference electrode cavity. Re-
check electrical and chromatography connections (see Section 3).
2.
If using the Cell Preheater to maximize baseline stability, turn it on via the LC-22C control-
ler. Use the HIGH setting on the Preheater for 40–65
°
C and the LOW setting for
30–45
°
C, and set the LC-22C accordingly.
3.
Zero the recorder with its zero control. Baseline should be on the right side of the paper.
(This may vary among chart recorder models.)
4.
Turn the CELL switch to STBY.
5.
Turn the POWER switch to ON.
6.
Select desired potential. Use the DISPLAY keys to set the LED display to App E. Use
the POTENTIAL toggle switch to change the sign (+ or –), and the knob to change the
magnitude, of the applied potential.
7.
Set OUTPUT switch on rear panel output for correct mode (oxidation or reduction).
8.
Set the output FILTER to 0.1 Hz, or whatever is appropriate for the type of chromatography
you are doing. Set the filter using the [+] and [–] keys on the front panel (see Section
4.1).
9.
Set RANGE to 1
µ
A. Use the [+] and [–] keys on the front panel, and observe the display.
10. Turn both OFFSETS to the OFF position.
WARNING: The CELL switch must be in the STBY position
when the LC-4C is turned on or off, and for any electrode
servicing. Disassembling a “live” cell can permanently
damage the working electrode and the electronic circuits.
Section 4. Operating the Electrochemical Detector
32
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