CT198 Heaterstat Worksheet

Purpose:

Notes on specifying CT198:

Maximum watt density: Because the CT198 directly controls element temperature, standard watt density charts do not apply. However, when watt densities exceed 5 W/sq in, control accuracy suffers because the heater heats up too fast and the controller kicks in too soon for heat to "soak" into the part. Keep watt densities low for better control and (paradoxically) faster warmup.
Match calibration: Heaterstats are available match calibrated to heaters as model CT698. Customers should always prototype with CT198 first to determine the ideal setpoint. They can then return the "optimized" CT198 to Minco. We will measure its setpoint and calibrate CT698's to match (adjusting for heater resistance variations).
Setpoint: Be sure the setpoint range allows adjustment higher than the desired temperature.

ENTER Heater information
Heater model:
Element type:	Nickel Iron- Available in HK (Kapton) and H (Thermal-Clear) models; not available in HR (Silicone Rubber). Nickel - Available in HK (Kapton), H (Thermal-Clear) and HR (Silicone Rubber) models. See Heater Calc to determine resistance for HK and HR foil heaters. Copper - Only available in H (Thermal-Clear) models
Resistance: (from catalog)	ohms at °C Ohm's Law Calculator
Effective area:	sq in
Resistance tolerance:	±%

ENTER Application information
Supply voltage:	VDC
Control temperature:	°C

CALCULATED values
CT198 Part Number:	Return to automatic selection
Heater resistance:	ohms at °C ohms at 0°C (make complete R/T tables in RTD Calc)
Watts:	watts
Watt density:	watts/sq in
Current:	amps
Range of setpoint pot:	°C to °C

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