Q.Are there any documents that give an outline of powder level / piezoelectric toner sensors TSP series?

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A. The TSP Series sensors incorporate TDK's custom-designed IC which integrates circuits such as a frequency sweep oscillation circuit, waveform shaping circuit, phase detection circuit, and digital processing circuit. This achieves stable driving and detection performance. Components parts due not have any areas prone to deterioration, so the sensors achieve highly-reliable detection with a long lifespan. Please refer to the available product overview that explains the products and technology in the TSP series.