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RTD Sensors & Probes

RTD (Resistance Temperature Detector) sensors and probes are essential for delivering accurate and stable temperature measurements across a diverse range of applications. Engineered for reliability, RTDs provide consistent performance and are known for their long-term durability. EI Sensor specializes in offering customizable RTD solutions tailored to meet the specific requirements of your system, whether it’s for HVAC, medical devices, process control, or instrumentation.

Our rtd Offerings

We provide a broad selection of RTD sensors engineered for accuracy, consistency, and long-term reliability. Whether you need standard elements or custom configurations, our solutions are built to perform across a wide range of applications.

Electronic components: ceramic and epoxy encased thermal fuses with leads, scattered on white.

RTD Sensors

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.

Three industrial temperature sensors with metal probes and wires.

RTD Probes

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.

Common applications

Air Conditioners

Automation Control

Boilers

Building Automation

Central Air Systems

Condensor Coils

Duct Temperature Sensors

Heat Pumps

Heating Systems

Humidifiers/Dehumidifiers

HVAC Controllers & Equipment

Indoor/Outdoor Remote Sensing

Radiant Floor Heating

Thermostats

Appliances & White Goods

Clothes Dryers

Coffee Makers

Dishwashers

Electric Blanket Controls

Freezers

Oven Temperature Control

Refrigerators

Thermometers

Washing Machines

Water Heaters

Air/Water Temperature Monitoring

Controls

Heat Pumps

Heaters

Deep Fryers

Food Storage Systems

Ice Machines

Pasta Cookers

Prep Stations

Refrigerated Display Cases

Refrigerated Vending Machines

Sous Vide (LTLT-low temp long time)

Temperature Controlled Food Storage Systems

Toasters

Walk-In Commercial Refrigeration

Warming Trays

Commercial Vending Machines

Crystal Ovens

Fire Detectors

Fluid Flow Measurement

Gas Flow Indicators

Industrial Process Controls

Liquid Level Indicators

Microwave Power Measurement

Photographic Processing Equipment

Plastic Laminating Equipment

Rechargeable Battery Packs

Solar Energy Equipment

Thermoplastic Molding Equipment

Thermostats

Water Purification Equipment

Welding Equipment

Blood Analysis Equipment

Hemodialysis Machines

MRI Scanners

Blood Oxygenator Equipment

Cardiac Ablation

Fever Thermometers

Esophageal Tubes

Internal Body Temperature Monitors

Intravenous Injection Temperature Regulators

Organ Transplant

Patient Warming

Ventilators

Skin/Body Temperature Monitors

Thermodilution Catheter Probes

Audio Amplifiers

Automatic Climate Control

Coolant Sensors

Electric Coolant Fan Temperature Control

Emission Controls

Engine Block Temperature Sensors

Engine Oil Temperature Sensors

Electric Vehicle Battery Management

Hydrogen Fuel Sales

Intake Air Temperature Sensors

Oil Level Sensors

Outside Air Temperature Sensor

Perishable Shipping

Transmission Oil Temperature Sensors

Water Level Sensors

Consumer

Cell Phones

Electronic Thermometers

Home Weather Stations

Power Supplies (inrush current limiting)

Solar Collector Controls

Uninterruptible Power Supplies (over temperature sensing)

Energy, Renewable/Non-Renewable

Hydrogen Fuel Cells

Lead Acid Battery Management

Solar Panels

Wind Turbines

Temperature Sensing Insights

Red fire alarm with

Why Thermistors Matter in Fire Safety Devices

February 19, 2026
Explore how thermistors enhance fire safety devices with fast, accurate temperature detection for reliable, standards-compliant fire protection systems.
Assorted temperature sensors with various terminal types and wire colors.

Thermistor Averaging Sensors Explained

January 22, 2026
Thermistor averaging sensors measure multiple points for steadier HVAC, lab, and industrial control, improving accuracy, reliability, and efficiency.
Five black round thermistors with silver leads, varying in size.

What Is an Inrush Current Limiter? Types, Uses, & Benefits

January 9, 2026
Learn what an inrush current limiter is, how NTC and PTC types work, key benefits, and applications from EI Sensor.

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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.