INFICON Composer Elite Gas Concentration Monitor - Manual (Page 142)

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Composer Elite Operating Manual
The sending microphone cartridge provides the source of acoustic energy to excite
the diaphragm. It is designed to effectively couple acoustic energy into the
diaphragm yet not couple energy into the chamber body. It uses a pair of flat
response electro-dynamic microphones to accomplish this. This cartridge is
powered by the Sensor Control Unit portion of the Composer Elite System.
The receiving microphone cartridge is used for detection of the acoustic energy
transported across the resonant chamber and through the diaphragm. It is a wide
response electret type with a built in FET amplifier. Its signal is amplitude detected
by the Sensor Control Unit portion of the Composer Elite System.
Figure 9-3 Acoustic sensor main components 1
Inlet Tube
Outlet Tube
Resonant Chamber
Diaphragm
Sending Microphone
Cartridge
Receiving Microphone
Cartridge