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Product
3851 Series Smart Capacitive Transmitter
- Product details
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Overview
The 3851 Series miniaturized capacitive transmitter is a new-generation transmitter manufactured with internationally advanced technology and equipment. Key raw materials, core components and parts are imported, and the whole machine is assembled and tested under strict quality control. This product features advanced design principle, complete product specifications, and easy installation & operation. Its appearance perfectly integrates the two most popular and widely used transmitter designs in the global market, bringing users a brand-new using experience. Meanwhile, it is fully interchangeable with traditional 1151, CECC and other series products in installation dimensions, making it an ideal upgrade and replacement product for old models. In addition to the compact and exquisite design, this series is equipped with intelligent function fully compliant with the HART Fieldbus Protocol.
Features
1. High measurement accuracy and excellent long-term stability.
2. Miniaturized, lightweight, rugged and anti-vibration design, with external continuous zero & span adjustment and adjustable damping.
3. No mechanical moving parts, extremely low maintenance workload.
4. Unified structure for the whole series, strong interchangeability of components.
5. Optional wetted diaphragm materials for corrosion resistance in various harsh working conditions.
6. Explosion-proof structure, suitable for all-weather operation.
7. Built-in intelligent function compliant with HART Fieldbus Protocol.
Measuring Range
0~0.1kPa to 0~40MPa
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.
