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Product
421 Series Medium & High Temperature Pressure Transmitter
- Product details
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Features & Applications
The 421 Series Medium & High Temperature Pressure Transmitter is assembled with imported high-temperature resistant sensing elements, enabling the sensor probe to operate stably for a long term under a high temperature of 350℃.
Manufacturing Technology
Laser cold welding process is adopted between the sensor core and stainless steel housing, achieving complete integration to ensure the operation safety of the transmitter under high temperature conditions. Between the pressure core of the sensor and the amplification circuit, a PTFE (Polytetrafluoroethylene) gasket is used for heat insulation, matched with a dedicated heat dissipation device. The internal lead hole is filled with high-efficiency thermal insulation material aluminum silicate, which effectively blocks heat conduction and ensures the amplification and conversion circuit operates within the allowable temperature range.
Measuring Range
-100kPa ~ 100MPa (varies according to specific models)
Customized model selection and detailed specification drawings are available upon request.
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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.
