J type thermocouple senor is a temperature sensor based on the principle of thermoelectric effect, consisting of two conductor materials: iron (Fe) and copper nickel alloy (CuNi). Its working temperature range is from 0 ° C to 750 ° C (up to 1000 ° C in a short period of time), and it has the characteristics of low cost, high sensitivity, and good stability. It is widely used in temperature measurement and control in industries, scientific research, energy and other fields.
Detailed product introduction
1、 Product Overview
J type thermocouple senor is a temperature sensor based on the principle of thermoelectric effect, consisting of two conductor materials: iron (Fe) and copper nickel alloy (CuNi). Its working temperature range is from 0 ° C to 750 ° C (up to 1000 ° C in a short period of time), and it has the characteristics of low cost, high sensitivity, and good stability. It is widely used in temperature measurement and control in industries, scientific research, energy and other fields.
2、 Product Features
Wide temperature range
Standard temperature measurement range: 0 ° C to 750 ° C, with a short-term temperature tolerance of up to 1000 ° C (requiring special protective casing).
Suitable for medium to high temperature scenarios, especially exhibiting excellent performance in reducing atmospheres.
High sensitivity and response speed
The thermoelectric coefficient is about 50-55 μ V/° C, and the sensitivity is significantly higher than that of K-type thermocouples, making it suitable for detecting small temperature changes.
Fast response time (in milliseconds), suitable for dynamic temperature monitoring.
Economical and practical
Low raw material cost, high cost-effectiveness, suitable for large-scale industrial applications.
Environmental adaptability
Resistant to reducing atmosphere: Stable in reducing gases such as hydrogen and carbon monoxide.
Not suitable for highly oxidizing environments: Iron is prone to oxidation at high temperatures and needs to be used in conjunction with protective sleeves.
Standardization and compatibility
Compliant with international standards (IEC 584-3, ASTM E230) and compatible with mainstream temperature control instruments.
3、 Technical parameters
Parameter specifications
Temperature measurement range: 0 ° C to 750 ° C (conventional)
Short term temperature resistance limit of 1000 ° C (requires special protective sheath)
Accuracy level ± 2.2 ° C or ± 0.75% (IEC standard)
Wire diameter specification 0.2mm to 3.2mm (customizable)
Insulation material glass fiber PTFE、 ceramics
Sheath material: 304/316 stainless steel, Inconel, etc
Output signal millivolt level voltage (mV)
4、 Application Fields
Industrial Process Control
Metallurgical industry: temperature monitoring of high-temperature furnaces and heat treatment equipment.
Petrochemical industry: Temperature measurement of reducing atmosphere in pipelines and reaction vessels.
Energy and Electricity
Boiler combustion chamber and gas turbine exhaust temperature monitoring.
Food processing
Temperature control of baking equipment and sterilization tanks (requiring food grade protective covers).
Laboratory research
High temperature performance testing of materials and environmental simulation experiments.
5、 Installation and usage precautions
Installation requirements
Avoid long-term use in highly oxidizing atmospheres (such as oxygen rich environments).
The bending radius should be ≥ 5 times the wire diameter to prevent thermocouple wire breakage.
The cold end (reference end) needs to maintain temperature stability or use a cold end compensation circuit.
Maintenance suggestions
Regular calibration (recommended every 6-12 months).
Check if the protective sheath is corroded or damaged, and replace it promptly.
Common fault handling
Signal drift: may be caused by oxidation, and the thermocouple needs to be replaced or the protective sleeve needs to be upgraded.
Open circuit fault: Check if the wiring terminals or thermocouple wires are broken.
6、 Selection Guide
Choose the following configuration based on actual needs:
Temperature range: Conventional type (0-750 ° C) or high temperature type (with ceramic sheath).
Environmental medium: Bare wire type is selected for reducing gas environment, and stainless steel sheath is selected for corrosive environment.
Installation methods: threaded fixation, flange installation, or flexible probe.
Output interface: standard junction box, aviation plug or wireless transmission module (customized).
7、 After sales service and support
Warranty period: 12 months (non human damage).
Technical support: Provide installation guidance, fault diagnosis, and calibration services.
Customized service: Supports non-standard sizes, special sheath materials, or extension cord designs.
Summary
J type thermocouple senor are an ideal choice for medium to high temperature measurement scenarios due to their high cost-effectiveness, excellent adaptability to reducing atmospheres, and fast response characteristics. Proper selection and standardized installation can ensure its long-term stable operation and meet the diverse needs of industrial and scientific research fields.
If you need further technical parameters or customized solutions, please contact our engineering team!
