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Manufacture Highlight: EI Sensor Technologies

  • 2 min read

EI Sensor Technologies offers a full line of temperature sensors including thermistors, resistance temperature detectors (RTDs), thermistor probe assemblies and RTD probe assemblies. Companies worldwide depend on us for their precision temperature measurement and control products.

EI Sensor Technologies products are used worldwide throughout many industries including HVAC/R, Building Automation, Industrial Electronics and Food Processing/Handling.




Ei Sensor Technologies logo



Product Lines


Thermistors and RTDs are commonly mounted into protective enclosures. The resulting temperature probe assemblies are highly customized to fit specific applications and can be used in a variety of demanding temperature sensing applications. The protective enclosures can be formed out of stainless steel, aluminum, copper, brass and plastic.





Thermistors are thermally sensitive resistors whose electrical resistance changes when subjected to a corresponding change in body temperature. EI Sensor offers thermistors capable of operating over the temperature range of -70°C to +300° Celsius.

Thermistor Probes

Thermistor Probes

EI Sensor Technologies offers a wide range of Thermistor probes to meet the most demanding temperature sensing requirements. There are many standard part numbers shown in each probe category and many of these are available for immediate shipment through distribution.

RTDs (Resistance Temperature Detectors)

(Resistance Temperature Detectors)

RTDs are temperature sensors that exhibit an increase in resistance when subjected to an increase in their body temperature. There are two main types of resistance temperature detectors, thin-film and wire-wound. EI Sensor provides thin film platinum RTD sensors that are capable of operation from -200° to +850° Celsius.

RTD Probes

RTD Probes

EI Sensor Technologies offers RTD probe assemblies for precision temperature sensing applications




EI Sensor Technologies: The Details



There are two types of thermistors, NTC Thermistor sensors and PTC Thermistor sensors.

NTC thermistors (Negative Temperature Coefficient thermistors) exhibit a decrease in resistance as body temperature increases. NTC thermistors are produced using powdered metal oxides and the exact composition of those oxides as well as stabilizing agents determines the electrical characteristics of the thermistor.

PTC thermistors (Positive Temperature Coefficient thermistors) experience an increase in resistance as body temperature increases. The two main types of PTC thermistors include the Ceramic Switching PTC, which is a non-linear device, and the Silicon PTC, which is highly linear.


There are two main types of resistance temperature detectors, thin-film and wire-wound.

Wire wound RTDs are built using a small diameter wire, typically platinum, which is wound into a coil and packaged inside a ceramic insulator. Larger extension wires are then spot welded to the platinum wire.

Thin film RTDs are made by depositing a thin layer of resistive material, typically platinum film, onto a ceramic substrate. A pattern is then etched onto the element, creating the electrical circuit.

Market Applications

Markets and Applications for Thermistors, RTDs, Thermistor Probes and RTD Probes:

  • HVAC-R
  • Appliances & White Goods
  • Pool/Spa
  • Food Handling & Processing
  • Industrial Electronics & Controls
  • Medical & Healthcare
  • Transportation & Automotive
  • Consumer
  • Energy, Renewable/Non-Renewable