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Explosion-Proof RTD with Transmitter Series
- Product details
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Features: 1. Two-wire 4~20mA output with strong anti-interference ability; 2. Saves the cost of compensation wires and additional temperature transmitter installation; 3. Safety explosion-proof; 4. Automatic cold junction temperature compensation, non-linear correction circuit.
Applications: Outputs 4~20mA electrical signal, directly measures the temperature of liquid, steam, gas media and solid surfaces within -200℃ ~ 1300℃ in production sites with hydrocarbons and other explosives.
Working Principle: Explosion-proof thermocouple (RTD) adopts the gap flameproof principle to prevent explosion spread. The thermoelectric potential from the thermocouple or resistance signal from the RTD is converted into an unbalanced signal through the transmitter bridge, then amplified and converted into a 4~20mA DC signal for the working instrument to display the corresponding temperature.
Temperature Transmitter Accuracy Grade: 0.1; 0.2; 0.5
Display Accuracy Grade: Analog indicator type 2.5 grade; Digital display type 1.0 grade
Mounting Types: Fixed thread, movable flange, fixed flange, flexible pipe joint type, fixed tapered thread type, straight pipe joint type
Product Type Features Applications Fixed Thread Type (with Transmitter) Threaded mounting with integrated transmitter Temperature measurement and signal transmission in explosion-proof environments Fixed Flange Type (with Transmitter) Flange mounting with integrated transmitter Explosion-proof temperature measurement for large equipment Flexible Pipe Joint Type (with Transmitter) Movable joint with integrated transmitter Adjustable installation in explosion-proof environments Straight Pipe Joint Type (with Transmitter) Straight pipe joint with integrated transmitter Explosion-proof temperature measurement for pipelines
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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.
