Gamry Instruments TDC4, Operator'S Manual, Page: 13 / 32

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USB to COM Converters
Most modern PCs do not include COM ports. Fortunately, low cost, easy to use USB to COM
adapters/converters are generally available. They plug into a computer’s USB port and have a COM port
output.
These adapters generally require driver software. The RS232 port can be configured using utilities
provided with the driver. Make sure that you know which COM port has been assigned to the adapter.
Connecting the TDC4 to a Heater (and/or Cooler)
There are many ways to heat an electrochemical cell. These include an immersable heater in the
electrolyte, heating tape surrounding the cell or a heating mantle. The TDC4 can be used with all these
heater types, as long as they are AC powered.
Warning
An AC powered heater connected to a cell containing electrolyte can
represent a significant electrical shock hazard. Make sure that there are no
exposed wires or connections in your heater circuit. Even cracked insulation
can be a real hazard when salt water is spilled on a wire.
The AC power for the heater is drawn from Output 1 on the rear panel of the TDC4. This output is a CEE
22 Standard V female connector. Electrical cords with the corresponding male connector are available
worldwide.
Please check that the fuses on Output 1 are appropriate for use with your heater. The TDC4 is shipped
with 5 amp Output 1 fuses.
In addition to controlling a heater, the TDC4 can control a cooling device. The AC power for the cooler is
drawn from the outlet labeled Output 2 on the rear of the TDC4.
The cooling device can be as simple as a solenoid valve in a cold water line leading to a water jacket
surrounding the cell. Another common cooling device is the compressor in a refrigeration unit.
Before connecting a cooling device to the TDC4, verify that the Output 2 fuses are the correct value for
your cooling device. The TDC4 is shipped with 5 amp Output 2 fuses.
Connecting the TDC4 to an RTD Probe
The TDC4 must be able to measure the temperature before it can control it. The TDC4 uses a platinum
RTD to measure the cell temperature. A suitable RTD is supplied with the TDC4. This sensor simply plugs
into the rear panel RTD jack on the TDC4.
Contact Gamry Instruments, Inc. at our US facility if you need to substitute a third party RTD into a
CPT110 system.