CE Certification China Suppliers Factory Diaphragm Seal Pressure Gauge for Micro, Negative & Low-Pressure Measurement Manufacturers, Factory

The diaphragm-sealed pressure gauge is a specialized pressure measurement instrument ideal for micro-pressure, negative pressure, and low-pressure applications. This innovative device features a diaphragm—consisting of two corrugated metal diaphragms welded together—as its primary pressure sensing element. Its design incorporates a sealed isolation structure that allows the gauge to effectively measure humid, corrosive, or slightly dusty gas and liquid media, Manufactured by leading China suppliers, this diaphragm pressure gauge excels in low-pressure monitoring across various sectors such as ventilation, gas, and environmental protection. The sealing and isolation device consists of an isolation diaphragm, a sealed cavity, and a filling fluid, which work together to protect the diaphragm from direct exposure to potentially damaging substances, When pressure is applied, the diaphragm experiences axial elastic deformation, which is directly proportional to the measured pressure. This deformation is then amplified by the indicating mechanism, which includes a linkage, gear transmission, and pointer scale, converting the pressure readings into visible pointer deflection for easy interpretation, Choose high-quality diaphragm-sealed pressure gauges from reputable manufacturers and suppliers in China to ensure reliable performance and accuracy in your pressure measurement needs

Product Description

Product Specifications

Case Stainless steel
Size 100mm (4")
Ring (Cover) Stainless steel
Window Glass
Pointer Aluminum Alloy, Black Finished
Connection Stainless steel
Connection Location Lower, Center Back, Lower Back
Thread 1/8", 1/4", 3/8", 1/2"; PT(BSPT,ZG), BSP(G,PF), NPT etc.
Element (Bourdon Tube) Stainless steel
Movement Stainless steel
Dial Plate White Aluminum with Black Graduations

Core Features and Advantages

Advantages of micro-pressure measurement Extremely narrow measurement range, typically suitable for micro-pressure, low-pressure, and even negative pressure (e.g., -10~0 kPa) measurements within the 0~60 kPa range; resolution is far superior to ordinary Bourdon tube pressure gauges.
Excellent sealing and protection The sealed isolation structure effectively isolates corrosive gases, moisture, or media containing small particles, protecting the internal diaphragm element from damage and extending the instrument's service life.
Vibration and shock resistance The diaphragm element itself has a certain elastic buffering capacity, combined with the damping effect of the sealing fluid, effectively resisting minor external vibrations and pressure fluctuations, resulting in more stable measurement readings.
Easy installation and maintenance Compact size, with mostly threaded installation interfaces, suitable for small pipes or equipment; the sealed structure design reduces the risk of media leakage; routine maintenance only requires periodic accuracy calibration.

Typical Application Fields

HVAC Industry Measures air pressure and static pressure in ventilation ducts and air conditioning units, as well as furnace negative pressure.
Gas Industry Monitors low-pressure areas in gas transmission pipelines to ensure a safe and stable gas supply.
Environmental Protection Industry Used for differential or micro-pressure monitoring in baghouse dust collectors and desulfurization/denitrification equipment.
Light Industry Measures the low-pressure values corresponding to gas pressure or liquid levels in paper and textile production lines.

Frequently Asked Questions (FAQ)

What is the measurement range of this micro-pressure gauge?
It features an extremely narrow measurement range, typically suitable for micro-pressure, low-pressure, and even negative pressure measurements (e.g., -10~0 kPa) within the overall 0~60 kPa range.
How does the sealed isolation structure protect the instrument?
The sealed isolation structure effectively isolates corrosive gases, moisture, and media containing small particles. This prevents damage to the internal diaphragm element and significantly extends the service life of the gauge.
Is this pressure gauge resistant to vibrations?
Yes. The diaphragm element has a built-in elastic buffering capacity. When combined with the damping effect of the sealing fluid, it effectively resists minor external vibrations and pressure fluctuations, ensuring stable readings.
What type of maintenance is required?
Routine maintenance is minimal and generally only requires periodic accuracy calibration. The sealed structure design greatly reduces the risk of media leakage, making it very easy to maintain.
Which industries commonly use this pressure gauge?
It is widely used across multiple sectors including the HVAC industry (for ventilation ducts and AC units), the Gas industry (pipeline monitoring), Environmental Protection (dust collectors and desulfurization equipment), and Light Industry (paper and textile production lines).

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