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Figure 2 

Heater Settings 

The Heater Settings group contains various methods CT398 Utilities may use to convert heater resistance to temperature.  

The different methods are outlined below; only one method is required if this feature is desired by the user.  Alternately, the 

CT398’s Setpoint may be defined by heater resistance only (See Output Settings), meaning the entire Heater Settings group 

may be ignored.  Each method is accessed by the tab of the same name. The last selected tab within Heater Settings (Heater 

Code, Heater Characteristics, Temperature/Resistance Data, or Equation) defines which method the program uses to convert 

resistance to temperatures. 

Heater Code:

 A string of characters which, if provided with the heater, fully describes the heater’s characteristics.  This code 

must be received from Minco. 

Heater Characteristics: 

The heater element composition, base resistance, and optional calibration data points are used to 

characterize the heater.  

Temperature / Resistance Data:

 A set of temperature / resistance pairs are entered and used to characterize the heater.  A 

minimum of two temperature / resistance pairs are required, although more increases accuracy. 

Equation:

 Polynomial coefficients are entered and used to characterize a heater.  The equation relating heater resistance to 

temperature must be known to use this method. 

Summary of Contents for Heaterstat CT398

Page 1: ...CT398 HeaterstatTM Temperature Controller Technical User Guide...

Page 2: ...atus 2 Heater Settings 3 Output Settings 4 General Usage 5 Status Communication LED 5 Frequently Asked Questions FAQ 6 Specifications 7 Inputs 7 Outputs 7 Communication 7 General 7 Glossary 8 Document...

Page 3: ...easurement Pulse and Pulse Heating Depending on the characteristics of the thermal system the difference between the heater element temperature and the heat sink may vary significantly Since the CT398...

Page 4: ...agram 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...

Page 5: ...ature Resistance Data or Equation defines which method the program uses to convert resistance to temperatures Heater Code A string of characters which if provided with the heater fully describes the h...

Page 6: ...when not being used for PC communication The options are as follows Mode 1 LED to remain off during normal operation Mode 2 LED indicates when output is on for the purpose of heating but not including...

Page 7: ...ed 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 Communica...

Page 8: ...ification states the retention is at least 20 years and will withstand at least 1 million writes Q Why isn t the measured temperature of the heater surface the same as what is reported in the utility...

Page 9: ...esistance Temperature Setpoint Resolution 1 milliohm Resistance Measurement Accuracy 3 up to 55 C and at least 0 25 amp load 4 up to 70 C and at least 0 5 amp load Dimensions 1 50 L x 1 00 W x 1 00 D...

Page 10: ...request for heat but due to the heater being energized momentarily to check its temperature SSR Solid State Relay A type of relay without mechanical contacts constructed from solid state components TC...

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