Setpoint vs. Actual Temperature Monitor
• Improved Internal Reference Stability
• Accuracy < 0.2 %
• Compact size
• Temperature Stability to < 0.001 °C
• Linear Bipolar or Unipolar Output operates thermoelectrics or resistive heaters
• Max Thermoelectric Current Output
• Proportional Gain Range: 1 to 100
• Integrator Time Constant Range: 0 to 10 seconds
• Supply Voltage: +5 V to +12 V DC; contact factory for +30 V operation
• Mounting: PCB


General Description

The advanced and reliable circuitry of the HTC series achieves 0.001°C temperature stability. Its small, low profile package is ideal for designs with space constraints. The linear, PI control loop offers maximum stability while the bipolar current source has been designed for higher efficiency.

The HTC temperature controllers are easily configured for any design. Virtually any type of temperature sensor can be used with the HTC and a built in sensor bias current source simplifies use with resistive temperature sensors. The independently adjustable Proportional Gain (P) and Integrator Time Constant (I) can be modified to optimize temperature overshoot and stability.

Other features offer added flexibility. A single resistor sets the maximum output current to load. Add a diode to operate resistive heaters with a unipolar output current. An onboard reference voltage simplifies potentiometer control of the temperature setpoint. You can also choose to operate remotely with an external setpoint voltage. Two monitor pins provide access to the temperature setpoint voltage and the actual sensor voltage.

The HTC 1500 has proven reliable in such diverse fields as medical, defense, communications and manufacturing.

Free, effective, and responsive technical support is available to simplify incorporation of Wavelength products into your OEM designs.

Technical Details
The HTC Series Temperature Controller is a linear controller designed for stable, low noise operation. We recommend using a regulated, linear supply for optimum performance. Depending on requirements, some switching supplies may be used.

Operating the HTC with resistive heaters is very similar to operating the HTC with thermoelectric modules. Use low resistance heaters (< 25 ?) for maximum power output. Resistances greater than 100 ? may limit the output voltage, and therefore power, slowing down temperature changes. The output current maximum is reduced to 1 Amp. Bipolar mode should not be used with resistive heaters.

Compliance Voltage: +11 V with +12 V input
Setpoint Accuracy: 0.2 mV minimum, 5 mV maximum, 2 mV typical