Full definition
Pressure gauges are critical instruments used in various industrial applications to measure and display the gauge pressure of fluids, ensuring the safe and efficient operation of pneumatic, hydraulic, and other fluid systems. The most common type, the Bourdon tube gauge, utilizes a coiled metal tube that straightens as pressure increases, translating this movement into a dial reading. These gauges typically have an accuracy range of ±1.0-2.5% of full scale (FS) and are available in a variety of pressure ranges from 0-1 bar to 0-1,000 bar, accommodating different operational requirements. Diaphragm gauges are preferred for low-pressure applications and slurries, while digital gauges provide enhanced precision with an accuracy of ±0.1-0.5% FS and commonly feature a 4-20 mA output for integration with control systems.
The connection sizes for these gauges, commonly NPT 1/4" or BSP 1/4", ensure compatibility with standard piping systems, while the protection class, ranging from IP54 to IP67, indicates the gauge's resistance to dust and moisture ingress. This is particularly important in harsh industrial environments where exposure to contaminants can affect performance and longevity. The EN 837 standard governs the specifications for pressure gauges, ensuring reliability and safety in their use. Wetted materials, such as brass or 316 stainless steel, are chosen based on the fluid being measured to prevent corrosion and maintain accuracy over time.
In practice, pressure gauges are employed in a wide array of industrial sectors, including manufacturing, oil and gas, and water treatment. They help monitor pressure levels to prevent system failures, optimize process efficiency, and ensure safety compliance. Brands like Wika, Ashcroft, and Parker are known for their robust and reliable pressure gauges, chosen by engineers for their dependability in critical applications.