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Section 4. Operating the Electrochemical Detector
4.1 LC-4C Front Panel
Figure 4.1.
Front panel of LC-4C detector controller.
DISPLAY
UP
DN
POWER
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This section describes each feature of the LC-4C's front panel (Figure 4.1).
RANGE
_
+
FILTER
_
+
Potential
adjust
POWER
Applies main electrical power to controller circuitry; the red indicator light directly above the
switch will be illuminated when power is on. NOTE: When turning main power on or off,
the working electrode (CELL switch) should be placed in the Standby position (STBY).
DISPLAY
This switch selects the function to be monitored by the internal digital voltmeter (DVM) and
displayed on the front panel window. Current at the generator electrode (Igen, in µA or nA),
potential applied to the generator electrode (Egen, in V), potential applied to the working
electrode (App E, in V), output current (Output, in nA or µA), auto-offset current (Offset
nA or µA) and manual offset current (Offset
DISPLAY keys until the desired function is displayed on the lighted panel. The digital value
of the selected function will be shown in the middle of the display and the units on the right
side. The nominal ranges for each of the individual functions are: generator-electrode cur-
rent, 0 ± 10 µA; generator-electrode applied potential, 0 ± 1.900 V; working-electrode ap-
plied potential, 0 ± 1.999 V; output current 0 ± 50 µA; auto-offset current, 0 ± 1000 µA;
and manual-offset current, 0 ± 1000 nA.
Section 4. Operating the Electrochemical Detector
POTENTIAL
MANUAL OFFSET
AUTO ZERO
+
+
10
ZERO
OFF
100
ON
_
_
OFF
1000
Auto zero
Manual offset
adjust
, in nA) are chosen by pressing the up or down
M
MARKER
CELL
ON
STBY
TEST
adjust
, in
A
23
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