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Product
Diaphragm Seal Pressure Gauge
- Product details
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Instrument Principle:
When the pressure P of the measured medium acts on the diaphragm, the diaphragm deforms and compresses the sealing liquid in the pressure measuring system of the instrument, forming a pressure of P−ΔP. When the rigidity of the diaphragm is sufficiently small, ΔP is also very small, and the pressure formed in the measuring system is close to the pressure of the measured medium.
Application Scope:
Diaphragm seal pressure gauges are mainly used in petrochemical, caustic soda, chemical fiber, pharmaceutical, food, and other processes. Composed of a general-purpose pressure gauge, connector, and diaphragm isolator, they are used when measuring media that are highly corrosive, high-temperature, high-viscosity, easy to crystallize, easy to solidify, or contain solid suspended particles.
Flange Selection:
Common flange series are available according to GB (China), HGJ (Ministry of Chemical Industry), DIN (Germany), JIS (Japan), ANSI (USA), and actual usage. Special specifications can be customized.
Main Technical Parameters:
Measuring range: -0.1~100 MPa (customizable on request)
Isolator material: 1Cr18Ni, 316, 316L, 316+F4, F4
Diaphragm material: 316L, Cu30Ni70, Ta, H276C, F4, PTFE
Please contact us for detailed specifications, models and catalog selection. We will provide customized selection services！
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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.
