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Setpoint:
The desired resistance or temperature of the heater. If this value is higher than the heater’s measured value, the
heater is energized until this is no longer true. If this value is lower than the heater resistance, the Heater Output is pulsed to
monitor the resistance.
Process Value Range:
The lower and upper limit at which the LED will “fade on-fade off” when configured to do so.
Heater Shutdown:
The lower and upper limit at which normal operation will continue. If the heater falls outside of these limits,
the CT398 goes into Heater Shutdown and power must be cycled to resume operation. It’s recommended to set these to
values that would indicate a problem with the heater. This feature is temporarily suppressed when HeaterStat Utilities is
connected to a CT398.
Figure 4
General Usage
Status/Communication LED
The LED present on the CT398 serves as a status indicator by default, but will switch into communications mode if a Minco
Optical Communication Accessory (model AC221332) is attached to the LED. This is the method by which information is
moved to and from the CT398 via the Windows CT398 Utilities.
The LED is capable of different behaviors, configurable by the user. It also will display various error messages should that
occur, see Table 1.
NOTE: It is normal for the Status LED to exhibit a slight periodic flicker when lit. This is a result the CT398
periodically checking for communication attempts from the Optical Communication Accessory.
