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.
Mechanical Strain Isolation
Stress Reduction
The prevention of unwanted external forces from transferring to a sensitive measuring element preserves the accuracy of the transducer. Incorporating mechanical strain isolation into a sensor design ensures that mounting stresses do not affect the output.
Structural Decoupling
Decoupling the measurement core from the outer housing is achieved using flexible bellows, diaphragm suspensions or slender neck geometries. In high-precision force transducers, mechanical strain isolation prevents the distortions of the installation frame from translating into false measurement signals. This separation is particularly important when sensors are bolted directly to heavy machinery.
Metrological Stability
Uncompensated stresses can cause zero-point drift and alter the sensitivity of pressure or force sensors. With mechanical strain isolation, the sensitive strain gauges or silicon elements experience only the forces that are meant to be measured. This isolation reduces the need for frequent recalibrations and increases the reliability of the system.
Packaging Design
Modern micro-machined sensors use glass frit bonding or soft silicone gels to decouple the silicon die from the ceramic substrate. This approach to mechanical strain isolation allows the die to remain unaffected by the different thermal expansion rates of the packaging materials. The resulting assembly maintains its calibration profile over a wide temperature range, making it suitable for demanding industrial applications where temperature fluctuations are common.