• High Sensitivity (2100 pC/psi )
  • High Temperature To +500 Deg F
  • Electrically Isolated
  • Vibration Compensated
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The Models 765M30 and 765M35 High Intensity Acoustic Sensors (Microphones) are designed for the measurement of gas-borne sound in industrial applications. These sensors have been constructed for use in corrosive environments that are compatible with the type 316 stainless steel diaphragm. The electrically-isolated, coaxial stainless steel hermetic connector, when combined with the all-welded construction, provides a true hermetic seal.

Electrically, the Models 765M30 and 765M35 comprise sensing elements of piezoceramic material in a balanced and floating configuration to provide enhanced rejection of electrical noise associated with many industrial environments. An internal accelerometer provides cancellation of the acoustic element's inherent acceleration sensitivity. Optimum performance is achieved when used with a true differential input amplifier. Consult the factory for customized versions of this sensor.

With Connector Mated or Protected, Unit is Hermetically Sealed.


Charge Sensitivity 2100 +/-300 pC/psi
Avg Temp Coeff of Sensitivity 0.08% / Deg F
Frequency Response 2 Hz To 8,000 Hz
Dynamic Range 0.28 x 10-4 to 10 psi (191 dB SPL Max.)
Vibration Sensitivity 1.0 pC/g Typical, 2.0 pC/g Max.
Transducer Capacitance 14,500 pF +/-15%
Insulation Resistance 100 Megohms Min., 50 VDC Test
Isolation Resistance 100 Megohms Min., 50 VDC Test
Dielectric Strength 550 Vrms, 60 Hz, Element to Housing
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