Port Geometry and Gasket Seating on a Pressure Part
Controlled gland squeeze between 15% and 25% prevents mechanical die stress while isolating the pressure port against long-term fluid leakage.
Pressure Port Geometry
Inlet Configuration
The physical dimensions and internal shape of the opening through which a fluid enters a sensor housing dictate the flow dynamics and pressure transmission to the transducer. Altering the pressure port geometry is a common method used to optimize the speed and accuracy of pressure measurements.
Dynamic Response
The diameter and length of the inlet channel act as a pneumatic or hydraulic filter that affects the response time of the sensor. A narrow pressure port geometry limits the flow rate of the fluid, which dampens high-frequency pressure fluctuations and protects the sensor from water hammer effects. However, this dampening can also introduce phase delays in dynamic pressure systems.
Medium Interference
When measuring viscous fluids or media containing suspended particles, a narrow channel can become clogged and prevent accurate readings. Choosing a wide, open pressure port geometry prevents this blockage and ensures continuous pressure transmission. For sanitary or high-purity applications, flush diaphragm designs are used to eliminate the port cavity entirely, preventing fluid stagnation.
Installation Offset
The orientation and shape of the inlet can introduce measurement errors if the fluid velocity creates a dynamic pressure component at the port. In flowing systems, the pressure port geometry must be designed to capture only the static pressure of the fluid. This requirement is met by ensuring the port opening is perpendicular to the flow direction and has smooth, burr-free edges, which reduces turbulence and measurement noise.