Your Professional Probe Thermocouple Supplier
Xian Baochen Information Technology Co., Ltd. is located in high-tech Zone, Xi 'an, Shaanxi Province, China, is a focus on sensors, transmitters, inverters, power semiconductor devices and supporting instruments R & D, manufacturing, sales and service enterprises. The company invests in research and development team, cooperates with excellent universities, integrates industry resources, and provides the best quality solutions for domestic and foreign users. Enterprise mission: to meet user needs and create value for customers.
Why choose us
Sales Market
We Products are exported to Europe, America, Southeast Asia, West Asia, Central Asia and other countries around the world. Our products are well received in these markets.
Our Service
Able to quickly respond to customer needs, to provide personalized customization, timely delivery, professional technical support and perfect after-sales service.
Strict Quality Control System
Able to efficiently produce large quantities of products, advanced production processes and stable supply chains, the implementation of strict quality control system. Constantly introduce new technologies and new materials to improve product performance and production efficiency.
Wide Range of Applications
Through the EU CE, RoHs testing, products are widely used in petrochemical, water conservancy and hydrology, machinery and equipment, automobile manufacturing, industrial process control, weighing measurement, people's livelihood applications and other fields.
Probe Thermocouple
A probe thermocouple is a temperature sensor designed based on the principle of thermoelectric effect. Its core structure consists of two different metal conductors (thermocouples) welded into a closed loop. It generates thermoelectromotive force through the temperature difference between the measuring end (hot end) and the reference end (cold end), thereby achieving accurate temperature measurement.
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Product name |
Probe thermocouple |
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International standard scale |
K (default)/E/Pt100 etc |
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Measuring range |
0~600℃(K)/0~400℃(E)/-50~420℃(Pt100) |
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Protective tube material |
304 stainless steel |
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Protective tube diameter |
4mm(default)/3mm, 5mm, 6mm(customizable) |
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Protective tube length |
30mm(default)/ also 10/15/20/40/50/60/70/80/90/100/150/200mm(customizable) |
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Grounded or not |
Non-grounded type, commonly known as insulation type, isolation type, accurate and stable temperature measurement, free from external interference |
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Wire rod |
Standard 2*0.4mm first class temperature measuring wire, external precision Braided shield |
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Line length |
0.5m / 1m / 1.5m / 2m / 3m (customizable) |
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Terminal |
U-shaped terminal (default)/ Pin terminal and yellow can be customized Plugs, aviation plugs, etc |
Advantages of Probe Thermocouple
Fast Response
In semiconductor wafer growth equipment, a 0.5mm Φ probe is used to monitor the temperature gradient within the furnace (response time <0.1 second), ensuring uniformity of single crystal silicon.
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High Corrosion Resistance
Type B (PtRh30-PtRh6) can operate at temperatures of 1600°C-1800°C (e.g., for aircraft engine turbine disk temperature measurement) and withstand short-term temperatures of 2000°C.
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High Accuracy
Compliant with IEC 60584-1, Class 1 thermocouples have an error of ≤±1.5°C within the 0°C-1000°C range (e.g., Type K used in industrial boilers).
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Interference Resistance
A tinned copper braided shield (shielding effectiveness >80dB@1MHz) suppresses electromagnetic interference generated by equipment such as inverters and welding machines.
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Environmental Adaptability
Welded probes (e.g., Inconel 625 alloy) provide a leak-proof seal in a 35MPa hydrogen atmosphere (e.g., for hydrogen refueling station tank temperature measurement).
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Type of Probe Thermocouple
Type E
The Type E thermocouple is suitable for use at temperatures up to 900°C (1650°F) in a vacuum, inert, mildly oxidizing or reducing atmosphere. At cryogenic temperatures, the thermocouple is not subject to corrosion. This thermocouple has the highest EMF output per degree of all the commonly used thermocouples.
Type J
The Type J may be used, exposed or unexposed, where there is a deficiency of free oxygen. For cleanliness and longer life, a protecting tube is recommended. Since JP (iron) wire will oxidize rapidly at temperatures over 540°C (1000°F), it is recommended that larger gauge wires be used to compensate. Maximum recommended operating temperature is 760°C (1400°F).
Type K
Due to its reliability and accuracy, Type K is used extensively at temperatures up to 1260°C (2300°F). It's good practice to protect this type of thermocouple with a suitable metal or ceramic protecting tube, especially in reducing atmospheres. In oxidizing atmospheres, such as electric furnaces, tube protection is not always necessary when other conditions are suitable; however, it is recommended for cleanliness and general mechanical protection. Type K will generally outlast Type J because the JP (iron) wire rapidly oxidizes, especially at higher temperatures.
Type N
This nickel-based thermocouple alloy is used primarily at high temperatures up to 1260°C (2300°F). While not a direct replacement for Type K, Type N provides better resistance to oxidation at high temperatures and longer life in applications where sulfur is present.
Type T
This thermocouple can be used in either oxidizing or reducing atmospheres, though for longer life a protecting tube is recommended. Because of its stability at lower temperatures, this is a superior thermocouple for a wide variety of applications in low and cryogenic temperatures. It's recommended operating range is— -200° to 350°C (-330° to 660°F), but it can be used to -269°C (-452°F) (boiling helium).
Types S, R and B
Maximum recommended operating temperature for Type S or R is 1450°C (2640°F); Type B is recommended for use at as high as 1700°C (3100°F). These thermocouples are easily contaminated. Reducing atmospheres are particularly damaging to the calibration. Noble metal thermocouples should always be protected with a gas-tight ceramic tube, a secondary tube of alumina and a silicon carbide or metal outer tube as conditions require.
W-5 Percent Re/W-26 Percent Re (Type C*)
This refractory metal thermocouple may be used at temperatures up to 2315°C (4200°F). Because it has no resistance to oxidation, its use is restricted to vacuum, hydrogen or inert atmospheres.
Applications of Probe Thermocouple
Industrial Manufacturing
Monitor furnace temperature distribution (e.g., above 1600°C) to optimize molten iron composition and prevent overheating and damage to the furnace lining.
Energy Development
Monitor laminator temperature (150°C-200°C) to ensure EVA film curing quality (temperature deviations of ±3°C can increase delamination rates).
Aerospace
In aircraft engine test benches, measure combustion chamber outlet temperatures (1500°C-1800°C) to verify the material's temperature resistance (requires a Type B platinum-rhodium alloy probe).
Research and Experimental
Measure sample mass changes during heating and cooling (e.g., polymer decomposition temperature determination, with an accuracy of ±0.1°C).
Working Principle of Probe Thermocouple
Thermoelectric Effect (Seebeck Effect)
When the weld (hot junction) of two dissimilar metals (such as nickel-chromium-nickel-silicon) is within the measured temperature field, and the reference junction (cold junction) is held at a constant temperature, a thermoelectric potential (EMF) proportional to the temperature difference is generated in the circuit. For example, for a K-type thermocouple, the thermoelectric potential is linearly proportional to temperature over the range of 0°C to 1300°C, with an error within ±0.4°C.
Signal Conversion Mechanism
The thermoelectric potential is transmitted via compensation wires to a display instrument or data acquisition system. After cold-junction compensation (eliminating ambient temperature interference) and linearization, the measured temperature value is directly output. For example, in industrial furnace temperature monitoring, the thermocouple output signal can drive a PLC system to automatically adjust the heating power.
Installation and Maintenance Points of Probe Thermocouple
Installation Specifications
★Vertical Installation: In high-temperature steam pipelines, the probe should be inserted vertically to reduce thermal stress (e.g., insertion depth ≥ 150mm for DN100 pipes).
★Angled Installation: When the medium velocity exceeds 5m/s, the probe should be tilted 45° to prevent wear (e.g., for oil pipeline temperature measurement).
★Sealing: For high-pressure applications, welded joints or metal gaskets should be used for sealing (e.g., for ammonia synthesis tower temperature measurement).
Maintenance Cycle
★Regular Inspection: Check the probe for oxidation every three months (e.g., K-type thermocouples are prone to forming an oxide layer at high temperatures, causing resistance changes).
★Calibration Verification: Perform annual comparison calibration using a standard thermostat (e.g., place the probe in a 100°C oil bath and compare the displayed value with the reference value).
★Replacement Standard: When the thermoelectromotive force deviation exceeds twice the allowable error, the thermocouple should be replaced (e.g., after long-term use at 900°C, the deviation of an E-type thermocouple may reach ±3°C).
FAQ
As one of the leading probe thermocouple manufacturers and suppliers in China, we warmly welcome you to wholesale cheap probe thermocouple in stock here from our factory. All customized products are with high quality and competitive price.
probe thermocouple