Piezoelectric sensors, longitudinal strain measuring pins (M5) / 9247A
Piezoelectric sensor for monitoring cavity and injection pressures, e.g. in injection molding. This longitudinally sensitive pin is used for indirect measurement of dynamic pressures and strains.
- Piezolelectric sensor of very small size
- Contact-free measurement of high pressures
- Cavity pressure measurement behind the cavity wall, without imprint
- Indirect measurement of injection pressure in the nozzle
The measuring pin is mounted with a precisely defined preload. The strain in the surrounding material is transferred via the end of the sensor and the external thread to the quartz sensing element. The electrical charge output is proportional to the change in mechanical strain. A charge amplifier converts the charge into a voltage signal that can be processed as required. The sensitivity of the entire structural system must be analyzed for an absolute pressure measurement. This means that the expansion or compressibility of the relevant structure, including mounted measuring pin, must be determined, via a calculation or comparison measurement.