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Product
Magnetic-assisted Electric Contact Pressure Gauge
- Product details
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Instrument Principle:
The instrument consists of a measuring system, indicating device, magnetic electric contact device, case, adjusting device, and junction box. Based on the elastic deformation of the Bourdon tube under pressure, the end displacement is amplified by the gear transmission. The pointer indicates the measured value. When touching the set pointer contact, the control circuit is switched on or off for automatic control and alarm.
Application Scope:
Widely used in petroleum, chemical, metallurgical, power station, and mechanical equipment for measuring non-explosive fluid pressure. Used with electrical devices to realize automatic control and alarm.
Main Technical Parameters:
Case diameter: 100, 150 mm
Indicating accuracy: 1.6%
Contact number: 2
Setting accuracy: 4%
Max working voltage: AC380V or DC220V
Max current: 1A
Contact power: 30 VA
Glass: Safety explosion-proof, standard
Connection thread: M20×1.5 or custom
Protection class: IP65
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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.
