Remote Control The remote connector of the C3 allows the stirring and gas purge functions to be controlled
by an external unit. The cell stand was specifically designed to be controlled by the
appropriate commands from the BAS 100 Series Electrochemical Analyzer and CV-50W.
These functions can be activated by either a TTL signal or from any controller providing a
contact closure to the ground. All lines are active low (negative edge triggered) and the pin
designations of the remote connector are as follows:
Pin Description
4 digital ground
7 digital ground
8
STIR
21
PURGE
Operation of these lines is also dependent on the setting of the stir and purge switches on
the front panel.
Gas Purge The flow rate of the gas and whether it is directed to the purge or blanket lines is controlled
by a front panel knob and switch. When toggled to the ON position, the gas flow is directed
to the purge line and cannot be changed by remote control. When switched to the
REMOTE/BLANKET position, the gas is directed to the blanket line. It must be in this
position to externally control PURGE via the REMOTE connector on the back panel. The LED
is lit when the purge function is on, either manually or remotely.
Stir The C3 has a precisely controlled magnetic stirrer. The stirrer can be controlled either by the
front panel switches or remotely. When the stir switch is toggled to the ON position, the
stirrer is on at the rate selected by the rate switch (50-800 RPM) and cannot be remotely
controlled. The REMOTE position is required for remote control of the stirrer. The LED is lit
when the stir function is turned on, either manually or remotely.
Faraday Cage The C3 is supplied with an easily removed Faraday Cage. The Faraday Cage pivots on
lift-off hinges. The latch grounds the Faraday Cage; thus, the door must be completely
closed for it to be effective. For many experiments, the signal generated at the electrode is
large enough that the Faraday Cage is not necessary. When small signals must be
measured, the Faraday Cage will shield the cell from many electrical interferences.
Unconnected wires and water lines for temperature control passing through the wall of the
Faraday Cage may act as antennas and be sources of line frequency interference for small
signals. For best results, remove any unconnected wires and properly ground water lines.
Removal of Cell Lead Box Remove the cell lead box by loosening the two thumb screws from the back panel (see
Figure 2) and sliding the cell lead box out. When replacing the thumb screws, tighten well
to ensure proper grounding of the case.
Section 4. Operation
14
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