Temperature Sensor; Thermocouple, Thermistor & RTD

Temperature Sensor

Temperature Sensor: Thermocouple, Thermistor, RTD, and More

A temperature sensor detects and measures heat in a process, machine, or environment and converts it into an analog or digital signal for monitoring and control. From household thermostats to industrial furnaces, these sensors are the basis of accurate temperature control, protection, and data logging.

Types of Temperature Sensors

The three most widely used contact types are the thermocouple, the thermistor, and the RTD. Thermocouples offer ruggedness and a very wide range, thermistors give fast and highly sensitive readings, and RTDs provide excellent accuracy, stability, and linearity.

Thermocouple: two dissimilar metals joined at one end generate a voltage proportional to the temperature difference (Seebeck effect). Self-powered, fast, and rugged, with a very wide range (K, J, T, N, R, S types). Requires cold junction compensation.
Thermistor (NTC / PTC): a ceramic semiconductor whose resistance changes sharply with temperature. Very sensitive and fast, best for a limited range; its response is non-linear.
RTD (Pt100 / Pt1000): a platinum element whose resistance rises almost linearly with temperature. High accuracy, repeatability, and long-term stability, with 2, 3, or 4-wire connection options.
Semiconductor (IC) sensor: silicon-based sensor with analog or digital output, compact and easy to interface with microcontrollers and PLCs.
Infrared (non-contact) sensor: measures surface temperature from a distance, suited to moving, hot, or hard-to-reach objects.
Bimetal thermostat: simple mechanical on/off control based on the expansion of two bonded metals.

Comparison at a Glance

Thermocouple: wide range, rugged, and fast. Typical use: furnaces, kilns, engines, and boilers.
Thermistor: high sensitivity and fast response. Typical use: HVAC, medical devices, and battery packs.
RTD: accuracy, stability, and linearity. Typical use: process control, food, pharmaceutical, and laboratory.

Applications of Temperature Sensor

Industrial furnaces, ovens, and heat treatment
HVAC and refrigeration systems
Food processing and pharmaceutical production
Oil, gas, and petrochemical plants
Power generation, motors, and transformers
Laboratory and medical equipment

How to Choose a Temperature Sensor

Temperature range: select a type that covers the minimum and maximum process temperature
Accuracy and stability: RTDs for precision, thermocouples for extreme heat, thermistors for narrow-range sensitivity
Response time: thin or exposed probes respond faster than sensors in thermowells
Output signal: millivolt, resistance, 4-20 mA, 0-10 V, or digital, matched to the controller or PLC
Probe material and construction: stainless steel, ceramic, or special alloys for corrosive or high-pressure media
Protection rating: IP rating, vibration resistance, and suitability for the installation environment
Connection and mounting: wiring type, thread size, immersion length, and head or connector style

Prices and Technical Support

Temperature sensor prices vary by sensor type, temperature range, accuracy class, probe material, and brand. For an up-to-date price or free technical consultation, our team is ready to help you choose the right thermocouple, thermistor, or RTD for your application.

Contact form: contact us
Phone:+9714337738

JKN Temperature Probes Thermocouple TK-301-P-8-500

JKN

TK-301-P-8-500 is a head type thermocouple. Thermocouples are two metal wires which are connected on a hot junction; when the temperature change, a signal is created. Customized thermocouples are...
JKN Temperature Probes Thermocouple TK-101-6-P-5-100-3MW-T

JKN

TK-101-6-P-5-100-3MW-T is a wired type thermocouple. Thermocouples are two metal wires which are connected on a hot junction; when the temperature change, a signal is created. Customized...
RTD PT100, 250 mm Probe Length, 3 wire, 1/2 NPT Connection - TK-301-P-8-250

JKN

JKN Head Mounted type Thermocouple - TK-301-P-8-250 8 mm Diameter, IP67, RTD PT100, 400° C max TK-301-P-8-25
JKN Temperature Probes Thermocouple TK-301-P-8-200

JKN

TK-301-P-8-200 is a head type thermocouple. Thermocouples are two metal wires which are connected on a hot junction; when the temperature change, a signal is created. Customized thermocouples are...
RTD PT100, 150 mm Probe Length, 3 wire, 1/2 NPT Connection - TK-301-P-8-150

JKN

JKN Head Mounted type Thermocouple - TK-301-P-8-150 8 mm Diameter, IP67, RTD PT100, 400° C max TK-301-P-8-15
JKN Temperature Probes Thermocouple TK-301-P-8-100

JKN

TK-301-P-8-100 is a head type thermocouple. Thermocouples are two metal wires which are connected on a hot junction; when the temperature change, a signal is created. Customized thermocouples are...
JKN Temperature Probes Thermocouple TK-301-P-6-250

JKN

TK-301-P-6-250 is a head type thermocouple. Thermocouples are two metal wires which are connected on a hot junction; when the temperature change, a signal is created. Customized thermocouples are...
JKN Temperature Probes Thermocouple TK-301-P-6-150

JKN

TK-301-P-6-150 is a head type thermocouple. Thermocouples are two metal wires which are connected on a hot junction; when the temperature change, a signal is created. Customized thermocouples are...
JKN Temperature Probes Thermocouple TK-301-P-6-100

JKN

TK-301-P-6-100 is a head type thermocouple. Thermocouples are two metal wires which are connected on a hot junction; when the temperature change, a signal is created. Customized thermocouples...