Excellence in

Temperature Sensing

EI Sensor is a prominent manufacturer and provider of temperature sensors. Our products include PTC and NTC Thermistors, RTDs (Resistance Temperature Detectors), Thermistor Probe Assemblies and RTD Probe Assemblies.

Many thermistors, RTDs, and probe assemblies are available for immediate shipment through authorized distributors. Check the part number tables for stocked items. Our design engineers can assist with specialized probes. We look forward to working with you!

Access technical specifications, support documents, blogs and more for our temperature sensors and probe assemblies. If you need additional help selecting a temperature sensor or probe assembly, our team is ready to help.

The ability to tailor a temperature sensor for a specific application is crucial. Whether it’s unique electrical properties, special physical requirements or harsh environmental considerations, we’re here to help you thru this process. Contact us now.

FILL OUT technical form application

Many thermistors, RTDs, and probe assemblies are available for immediate shipment through authorized distributors. Check the part number tables for stocked items. Our design engineers can assist with specialized probes. We look forward to working with you!

Access technical specifications, support documents, blogs and more for our temperature sensors and probe assemblies. If you need additional help selecting a temperature sensor or probe assembly, our team is ready to help.

The ability to tailor a temperature sensor for a specific application is crucial. Whether it’s unique electrical properties, special physical requirements or harsh environmental considerations, we’re here to help you thru this process. Contact us now.

Know the part number you need? Check this alphanumeric list to see if it’s stocked by our authorized distributors. If you don’ t find the part number listed, contact us at sales@ei-sensor.com with the part number/quantity you require.

Explore Our Core Offerings

Thermistors

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.

RTDs

RTDs are temperature sensors that exhibit an increase in resistance when subjected to an increase in their body temperature. EI Sensor provides thin film platinum RTD sensors that are capable of operation from -200° to +850° Celsius.

Custom Solutions

If a standard design does not fit your needs, there are endless customized thermistor and RTD options we can offer. Our knowledgeable engineering staff will work closely with you to collect the necessary details specific to your unique sensing requirement.

PRECISION SENSORS FOR EVERY INDUSTRY

Temperature sensing is a critical parameter for industries such as HVAC/R, Building Automation, Industrial Electronics, Medical & Healthcare, Food Handling & Processing, White Goods/Appliances, Energy, Environmental Systems & Controls, Fire & Safety and Transportation/Automotive. EI Sensor thermistors and RTD sensors are installed into devices throughout these industries with the purpose of accurately and efficiently measuring, monitoring and/or controlling the temperature of a medium within a given set of requirements.

HVAC

Thermistors and RTDs play a crucial role in the HVAC industry by monitoring and controlling temperature, which is essential for maintaining optimal environmental conditions in homes, buildings, and facilities.

Medical & Healthcare

RTDs and Thermistors provide precise, reliable temperature control, vital to allowing healthcare professionals to make informed decisions promptly, assuring patient safety and enhancing patient outcomes.

A hand is holding a thermometer that reads 31.4 degrees celsius

Industrial

Temperature measurement using thermistors and RTDs in industrial control applications is critical for maintaining efficiency, improving reliability, ensuring safety, and supporting consistent, accurate process performance.

Custom Thermistors & RTDs

EI Sensor has many standard sensor designs to fit a multitude of temperature sensing applications. If a standard design does not fit your needs, there are endless customized thermistor and RTD options we can offer. Our knowledgeable engineering staff will work closely with you to collect the necessary details specific to your sensing requirement.


There are many key factors to consider when designing a temperature

sensor for an application. Information such as maximum operating temperature, temperature accuracy, environmental conditions the thermistor, RTD or temperature probe assembly may be subjected to, physical constraints plus more will be critical to the design process. We are here to help you every step of the way!

A pen is laying on top of a piece of paper that says ei sensor technologies

Temperature Sensing Insights

There are many different types of thermometers on a white surface.

What is a Thermistor Probe?

By EI Sensor • August 1, 2025
Learn what a thermistor probe is, how it works, and why it’s ideal for accurate temperature sensing in industrial, medical, and HVAC applications.
A blue and orange logo for ei sensor technologies

EI Sensor Technologies Engineer Training

By EI Sensor • July 30, 2025
Upcoming event
A bunch of different types of electronic components on a white background

Temperature Sensor Terminology

By EI Sensor • July 28, 2025
Explore key temperature sensor terminology and definitions to better understand RTDs, thermistors, accuracy, response time, and more in sensor applications.
Show More

partner with ei sensor

Using the highest quality materials, state of the art equipment and proprietary production techniques, EI Sensor is dedicated to producing a temperature sensor that meets or exceeds our customers’ requirements. With a strong commitment to quality, continuous improvement is necessary. Our team continues to invest in research and development of new processes as well as enhancing existing processes that will result in a precise, efficient, cost effective thermistor, RTD or temperature probe assembly.