What Are Solid-state thermostats?

Solid-state thermostats are devices that utilize electronic technology for temperature control. In comparison to traditional mechanical thermostats, they provide improved precision, quicker response times, and enhanced reliability. These thermostats commonly employ microelectronic sensors to detect temperature variations and manage the on/off function of heating or cooling devices through electronic circuits, ensuring a consistent set temperature. They are extensively used in household appliances, industrial process control, and medical equipment.

Q: What is the basic output of the solid-state sensor?

A: Unlike thermocouples, which produce a millivolt-range voltage with limited current capacity, solid-state sensors act as current sources. Their output is a proportional-to-absolute-temperature (PTAT) current, typically providing an output of 1 µA/K.

Q: What range is practical for the solid-state sensor?

A: The practical range depends on the specific make and model, but many can operate from -55°C to +150°C, making them suitable for a wide array of applications. In contrast, thermocouples can function at temperatures below -100°C on the low end and thousands of degrees on the high end.

Q: Are there specific design considerations for using these sensors?

A: The basic sensor is straightforward to use. It is a two-terminal device that operates on a relatively wide DC power supply, typically ranging from +4 to +30 V. This voltage powers the sensor, which then regulates the current flow to maintain the 1 µA/K output proportionally.