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Power
This connection provides power to the CT398 electronics and is used to monitor the heater voltage. To accurately measure
the heater resistance, this connection must be as close as possible to the heater’s positive side; the preferred method is to
connect this terminal directly to the heater and directly to the power supply using separate wires. See
Figure 1
for a
connection diagram.
Ground
This connection is the return path for the heater current and CT398 electronics. Therefore, ensure the wire used is adequately
sized to carry the heater current.
Heater
This connection is for the heater’s negative (return) side. It is an open-drain output that sinks current to the Ground
connection. As with the Ground connection, ensure the wire used is adequately sized to carry the heater current.
Typical Wiring Diagrams
Below is a typical wiring diagram for the CT398.
Figure 1
Configuration
A separate programmer, model AC221332, is necessary to configure the CT398. This device optically communicates with the
CT398 though the Status/Comm LED. To use, connect the programmer to a computer with a USB Cable and place the
programmer LED interface tubing over the CT398’s Status/Comm LED. Then, using the HeaterStat Utilities software, press
“Connect to Device”. If this is successful, the configuration stored on the CT398 is retrieved and displayed, along with the
calculated temperature and output status. The settings are separated into groups: Status, Heater Settings, and Output
Settings.
Status
The Status group displays the heater’s measured resistance and output status. The Heater Output status will indicate if the
Heater Output is energized while attempting to increase its temperature, but not while the CT398 is pulsing the output to test
the heater resistance. See Figure 2. If the heater is properly defined within the Heater Settings tab, the status page will also
display the calculated temperature based on the measured resistance.
