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Product
Explosion-Proof Thermocouple
- Product details
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Type: Explosion-proof Series
Features: Explosion-proof Exd II CT6; protection IP65; suitable for hazardous areas; good anti-vibration; wide measuring range.
Application: Petrochemical, chemical, coal mine and other flammable explosive environments. Measures 0°C ~ 1300°C for liquids, steam, gases, solid surfaces.
Working Principle: Flameproof by gap isolation. Spark and heat components sealed in junction box; explosion cooled through gap to prevent external ignition.
Temperature Range: 0°C ~ 1300°C (varies by model)
Mounting: Fixed thread, fixed flange, flexible union, fixed thread cone, straight union
Sensor Materials: NiCrSi-NiSi, NiCr-NiSi, NiCr-CuNi, Fe-CuNi, Cu-CuNiProduct Type Features Applications Explosion-proof Fixed Thread Type Thermocouple Combines explosion-proof performance with fixed thread structure Suitable for fixed installation in explosion-proof environments Explosion-proof Fixed Flange Type Thermocouple Adopts flange connection with explosion-proof design Suitable for explosion-proof occasions requiring flange connection Explosion-proof Union Fitting Type Thermocouple Combines movable joint structure with explosion-proof performance Suitable for flexible installation in explosion-proof environments Explosion-proof Straight Fitting Type Thermocouple Explosion-proof design with straight pipe fitting connection Suitable for pipeline connection in explosion-proof environments
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Q
What is a thermocouple?
A
Thermocouples are the preferred solution for extreme temperature applications. They consist of two dissimilar metal wires joined at the measuring end, generating a voltage proportional to the temperature difference.
Working Principle: When two different metals are connected, the thermoelectric effect produces a voltage at the junction. This voltage increases with rising temperature, allowing measurement via reference tables.
Key Advantages:
• Temperature Range: -270°C to 2300°C (depending on type)
• Fast Response Time (typically 0.1–10 seconds)
• Robust Construction, vibration-resistant
• Relatively Low Cost
• No External Power Required
Q
What is the difference between RTD and thermocouple?
A
• RTD (Resistance Temperature Detector): Based on the principle that a metal conductor's resistance increases with temperature, it converts resistance measurements into temperature readings.
• Thermocouple: Operates on the Seebeck effect, where two dissimilar metals in contact generate a thermoelectric voltage proportional to temperature differences.
Features
• RTD: High accuracy, stable signal, excellent linearity, ideal for low to medium temperatures.
• Thermocouple: Simple structure, fast response, high-temperature resistance, wide measurement range.
Pros & Cons
• RTD Pros: High precision, strong anti-interference, reliable low-temperature performance.
Cons: Limited upper temperature range, bulkier size, slightly slower response.
• Thermocouple Pros: Broad temperature range, high-temperature tolerance, rapid response, suitable for moving/surface measurements.
Cons: Lower accuracy at low temperatures, requires cold junction compensation, weaker signal prone to interference.
