Differential Pressure Gauge

Overview of Differential Pressure Gauge

The Differential Pressure Gauge is an essential tool for system maintenance and process automation, focusing on the difference between two pressures.

• What is it? It senses two pressure sources simultaneously through internal bellows. When a difference exists between the High-pressure side and the Low-pressure side, the bellows deflect, driving a high-precision movement that indicates the differential value on the dial.

• Main Application Field: Widely used in Petroleum, Chemical, Power, Heating, Ventilation, and Air Conditioning (HVAC) systems. It is specifically suited for monitoring pressure drops across filters and cleanroom pressure differentials.

• Key Characteristics: The bellows sensing element provides high sensitivity. The gauge offers a vast range of selection, from micro-pressures of 0–1 kPa up to high differentials of 2.5 MPa, while maintaining stable accuracy.

Key Features of the Differential Pressure Gauge

1. Bellows Sensing Element: Uses 316L or 304 stainless steel bellows, which are more sensitive to micro-differentials than traditional Bourdon tubes and offer better overpressure protection.

2. All-Stainless Steel Construction: The 304 stainless steel case, combined with stainless steel wetted parts, ensures longevity in aggressive environments like offshore platforms or chemical plants.

3. Dual Scale Capabilities: Capable of monitoring both low-pressure HVAC systems (kPa) and high-pressure chemical process lines (MPa).

4. Environmentally Sealed: Rated IP65, preventing moisture and dust from entering the internal mechanism, ensuring reliability in outdoor installations.

5. Clear Visualization: Available in 100mm and 150mm dial diameters for easy reading on complex piping manifolds.

Typical Applications of the Differential Pressure Gauge

• Filter Monitoring: Installed across liquid or gas filters to alert operators when a pressure drop indicates the need for cleaning or replacement.

• HVAC & Cleanrooms: Measuring duct pressure and maintaining a slight positive pressure in cleanrooms relative to the outside environment.

• Flow Measurement: Used in conjunction with primary flow elements like orifice plates or venturi tubes to calculate fluid flow based on the produced differential pressure.

• Level Monitoring: In sealed tanks, it measures the difference between the gas phase at the top and the liquid phase at the bottom to accurately calculate the liquid level.

OEM Service - About ZINACA Instruments

ZINACA Instruments provides professional customization for Differential Pressure Gauges:

Custom Ranges: Specialized scales (e.g., Bar/PSI) or non-standard ranges tailored to your specific process.

Mounting Options: Various thread sizes or flanged connections for seamless piping integration.

Oxygen Cleaning: Degreasing services for applications involving oxygen or high-purity gases.