Thermocouple/RTD Sensor

Product Specifications

Technical details and manufacturing context for Thermocouple/RTD Sensor

Definition

This product is a temperature sensor component used in machinery and equipment manufacturing, specifically within control panel and temperature sensor systems. It provides precise temperature measurement through thermoelectric or resistance-based principles, enabling accurate monitoring and regulation of industrial processes. The sensor is available in two primary types: thermocouples and resistance temperature detectors (RTDs). Thermocouples operate on the Seebeck effect, generating a voltage proportional to the temperature difference between two dissimilar metal junctions. RTDs measure temperature by correlating changes in electrical resistance of pure metal elements, typically platinum, with temperature variations. The sensor is constructed with materials such as platinum, nickel-chromium alloys, copper-nickel alloys, ceramic insulation, and a stainless steel sheath. Key parameters include a temperature range of -200 to 1300 °C depending on thermocouple type (e.g., K, J, T), accuracy class 1 for thermocouples and Class A for RTDs, response time of 0.5 to 5 seconds, probe diameter of 3 to 12 mm, insertion length of 50 to 500 mm, insulation resistance of at least 100 MΩ at 500 V DC, ingress protection rating of IP54 to IP65, sheath material of 304 or 316 stainless steel, output signal of 4-20 mA for RTDs with transmitter (thermocouples output in mV), supply voltage of 9 to 36 V DC for loop-powered transmitters, and weight of 0.1 to 2.0 kg. These values are reference ranges and must be confirmed for the specific model and application. The sensor complies with standards such as IEC 60584, IEC 60751, IEC 60529, and ASTM A312, which serve as procurement and verification references. Always verify model-specific values and standards with the legal manufacturer or supplier.

Working Principle

Thermocouples operate on the Seebeck effect, where a voltage is generated when two dissimilar metal junctions are at different temperatures. This voltage is proportional to the temperature difference and can be measured to determine temperature. RTDs (Resistance Temperature Detectors) measure temperature by correlating the change in electrical resistance of a pure metal element, typically platinum, with temperature. As temperature increases, the resistance of the metal increases in a predictable manner. The sensor's output, either a millivolt signal (thermocouple) or a 4-20 mA current loop (RTD with transmitter), is transmitted to a control system for monitoring and regulation. The sensor's design, including probe diameter and insertion length, affects response time and accuracy. Proper installation and calibration are essential for reliable operation.

Common Materials

Platinum, Nickel-Chromium alloys, Copper-Nickel alloys, Ceramic insulation, Stainless steel sheath

Technical Parameters

Parameter	Typical range	Notes & selection driver
Temperature Range	-200–1300 °C	Depends on thermocouple type (e.g., K, J, T)IEC 60584
Accuracy Class	1	Class 1 for thermocouples; RTD Class A availableIEC 60584
Response Time	0.5–5 s	Depends on probe diameter and constructionIEC 60751
Probe Diameter	3–12 mm	Smaller diameter for faster response
Insertion Length	50–500 mm	Custom lengths available
Insulation Resistance	≥100 MΩ	At 500 V DC, ambient temperatureIEC 60751
Ingress Protection	IP54–IP65	IP65 for washdown environmentsIEC 60529
Sheath Material	304/316 SS	316 for corrosive mediaASTM A312
Output Signal	4–20 mA	For RTD with transmitter; thermocouple output in mVIEC 60751
Supply Voltage	9–36 V DC	For 4-20 mA loop-powered transmitters
Weight	0.1–2.0 kg	Depends on length and head type

Ranges are indicative industry figures for RFQ preparation, not a supplier commitment. Confirm every value and standard with the legal manufacturer before ordering.

Components / BOM

Sensing Element Part
Primary temperature detection component (thermocouple junction or RTD wire)

Material: Platinum/Nickel-Chromium/Copper-Nickel alloys
Protective Sheath Part
Mechanical protection and environmental isolation of sensing element

Material: Stainless steel/Inconel
Insulation Material Part
Electrical isolation between conductors and sheath

Material: Ceramic/Magnesium oxide
Terminal Head
Connection interface for electrical wiring to control system

Material: Aluminum/Stainless steel/Plastic
Connection Wires Part
Electrical conductors transmitting signal to control panel

Material: Copper with insulation
Transmitter Optional
Turns the RTD resistance into the 4–20 mA current loop.

Applied To / Applications

This component is essential for the following industrial systems and equipment:

Control Panel & Temperature Sensor

View system integration details

Manufacturers of Thermocouple/RTD Sensor

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Frequently Asked Questions

What is the difference between a thermocouple and an RTD?

A thermocouple uses the Seebeck effect to generate a voltage proportional to temperature difference between two dissimilar metals, while an RTD measures temperature by correlating the change in electrical resistance of a pure metal (typically platinum) with temperature. Thermocouples have a wider temperature range (-200 to 1300 °C) but lower accuracy, while RTDs offer higher accuracy (Class A) but a narrower range.

What standards apply to this sensor?

The sensor references standards such as IEC 60584 for thermocouples, IEC 60751 for RTDs for operating pressure, IEC 60529 for ingress protection, and ASTM A312 for sheath material. These standards are procurement and verification references; always confirm compliance with the manufacturer.

How do I select the correct probe diameter and insertion length?

Probe diameter affects response time and mechanical strength; smaller diameters provide faster response but may be less robust. Insertion length should be chosen to ensure the sensing element is properly immersed in the process medium. Both parameters are available in ranges (3-12 mm diameter, 50-500 mm length) and must be selected based on the specific application and process conditions.

What is the typical output signal and supply voltage?

For RTDs with a transmitter, the output is a 4-20 mA current loop, requiring a supply voltage of 9-36 V DC. Thermocouples output a millivolt signal directly. The output signal is used by control systems for monitoring and regulation.

Data Basis

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pressure:	Typically up to 1000 bar (depends on sheath material and design)
other spec:	Response time: 0.1-10 seconds, Accuracy: ±0.1°C to ±2.2°C, Vibration resistance: up to 20g
temperature:	-200°C to +1800°C (depending on thermocouple type), -200°C to +850°C (for RTD)

Product Specifications

Applied To / Applications

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