Oil Cavity Volumetric Expansion Mitigation in Piezoresistive Transducers
Minimizing fluid volume below five microliters and matching diaphragm spring rate eliminates thermal zero shift in isolated piezoresistive pressure cells.
Sensor Accuracy Grading
Classification System
A standardized categorization method divides measurement instruments into distinct performance tiers based on their maximum allowable error. Applying sensor accuracy grading allows manufacturers to group completed sensors by their tested performance, ensuring each unit meets the needs of its specific application. This grading is determined during final testing under controlled laboratory conditions.
Tolerance Limits
Each accuracy grade has a defined limit for non-linearity, hysteresis, and repeatability errors. Sensors that fall within the tightest limits are designated for high-precision applications, while those with wider tolerances are allocated to general-purpose tasks. This sorting process ensures that the user receives an instrument that meets their required measurement tolerance.
Metrological Traceability
The equipment used to test and grade the sensors must be calibrated against standards that are traceable to national measurement institutes. This traceability ensures that the assigned accuracy grades are consistent and valid across the industry. Documentation certifying this traceability is often provided to the customer as part of the quality assurance package.
Selection Process
Choosing the correct grade for an application requires balancing the needed precision with the cost of the instrument. High-grade sensors are more expensive due to the more rigorous testing and selection required during production. This trade-off must be carefully evaluated to ensure the selected instrument is both cost-effective and capable of performing the required task without introducing excessive measurement uncertainty into the final system.