Thermistors
Thermistors are temperature-sensitive resistive devices used for accurate temperature measurement and control in a wide range of industrial and commercial applications. Their electrical resistance changes predictably with temperature, allowing systems to detect even small thermal variations. Because of their high sensitivity and fast response time, thermistors are commonly used in HVAC systems, industrial equipment, electronics, and process monitoring applications.
Thermistors are available in two primary types: negative temperature coefficient (NTC) and positive temperature coefficient (PTC). NTC thermistors decrease in resistance as temperature increases and are widely used for precise temperature sensing and measurement. PTC thermistors increase in resistance with rising temperature and are often used for overcurrent protection, self-regulating heating, and thermal safety functions. Both types are manufactured from thermally sensitive metal oxides and semiconductor materials.
RSP Supply offers thermistors in multiple physical configurations to match installation and application requirements. Options include thermistor probes for immersion or insertion sensing, compact thermistor sensors for equipment and electronic assemblies, pipe-mounted thermistors for monitoring fluid temperature in hydronic and process piping, and wall plate thermistors designed for accurate ambient air temperature measurement in HVAC and building automation systems. These configurations provide flexibility while maintaining reliable performance within the rated temperature range.
FAQs
Q: Are NTC and PTC thermistors considered temperature sensors?
Yes, both NTC and PTC thermistors are temperature sensors. They detect temperature changes by varying their electrical resistance in response to changes in temperature.
Q: How does the resistance of a thermistor change with temperature?
Thermistors have a nonlinear temperature-resistance curve. NTC thermistors decrease in resistance as temperature increases, while PTC thermistors increase in resistance as temperature rises. The resistance change is typically exponential over the operating range.
Q: What is a thermistor?
A thermistor is a thermally sensitive resistor that measures temperature by changing its electrical resistance as temperature varies. Each thermistor has a defined resistance-to-temperature relationship based on its material composition and design.
Q: What are the advantages of thermistors compared to RTDs?
Thermistors are generally smaller, less expensive, and respond more quickly to temperature changes than RTDs. They can provide very high resolution and accuracy within their specified temperature range.
Q: What are the limitations of thermistors compared to RTDs?
Thermistors have a more limited temperature range and a nonlinear output compared to RTDs. They are typically not suitable for temperatures above approximately 350°C and may require signal conditioning or linearization for precise measurement.
Why Buy Thermistors from RSP Supply
RSP Supply offers a comprehensive selection of thermistors designed for dependable temperature sensing, control, and protection in industrial applications. Our lineup includes NTC and PTC thermistors suitable for a wide range of operating conditions and system requirements. Customers rely on RSP Supply for consistent product quality, technical expertise, and components that support accurate and reliable temperature measurement.