All about
PIEZORESISTIVE pressures
Piezoresistive ceramic pressure sensors operate on the principle of variation of electrical resistance in response to mechanical stress. A typical sensor consists of a ceramic membrane with integrated piezoresistive strain gauges. When pressure is applied to the membrane, it deforms, which changes the resistance of the strain gauges. This change in resistance is proportional to the applied pressure and is converted into a measurable electrical signal.
The accuracy of ceramic piezoresistive pressure sensors is typically very high, often in the range of ±0,1% to ±0,5% of full scale, making them distinctive for applications where high accuracy is essential .
- High accuracy : Piezoresistive technology allows very precise measurements, essential for critical applications.
- Long-term reliability: Their robust ceramic construction ensures stable performance over long periods of time.
- Corrosion resistance : Ceramic sensors withstand corrosive environments well, making them ideal for industrial applications.
- High temperature stability: Ceramic can withstand high temperatures without alterations to its properties, ensuring accurate measurement even in extreme conditions.
- Durability: The robustness of the ceramic ensures a long life of the sensor, including maintenance requirements and associated costs.
- Large measuring range: These sensors can measure very low to very high pressures, offering great flexibility of use.
- Electromagnetic interference (EMI) immunity: The ceramic and sensor design minimize interference, ensuring reliable measurements even in electrically noisy environments.
Piezoresistive ceramic pressure sensors work by measuring the change in resistance caused by the deformation of the ceramic membrane under pressure. This variation in resistance is converted into an electrical signal proportional to the applied pressure.
To connect a piezoresistive ceramic pressure sensor:
- Position the sensor in a suitable location.
- fix the sensor securely to avoid any vibration or movement.
- Ensure the seal connections to prevent leaks.
- Connect the electrical terminals following the manufacturer's instructions.
- Calibrate the sensor initially and periodically to maintain accuracy.
- Test proper functioning by comparing measurements with known reference values.
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