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Product
Diaphragm Pressure Gauge
- Product details
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Instrument Principle:
The instrument consists of a measuring system, transmission indicating mechanism, and case. Its principle is based on the deformation of elastic elements. Under the pressure of the measured medium, the diaphragm produces corresponding elastic displacement, which is amplified by the connecting rod and transmission mechanism. The pointer fixed on the gear indicates the measured value on the dial.
Application Scope:
Diaphragm pressure gauges are suitable for measuring low or negative pressure of various fluid media with certain viscosity, non-solidifying, or non-crystallizing properties. Corrosion resistance depends on diaphragm material.
Main Technical Parameters:
Case diameter: 100, 150 mm
Accuracy: 2.5%
Ambient temperature: -40~70°C, relative humidity ≤90%
Temperature effect: Additional error ≤0.04%/°C when deviating from 20±5°C
Mounting: Vertical
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.
