• High Sensitivity (1200 pC/psi )
  • High Temperature To +500 Deg F
  • Electrically Isolated
  • Choice of Electrical Interface
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The Models 765M25 and 765M27 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 two designs differ only in their electrical connections. The Model 765M25 incorporates a miniature 10-32 fused-glass coaxial connector, and Model 765M27 provides a 2-pin connector interface. When combined with their all-welded construction, both units provide a true hermetic seal.

Electrically, these devices comprise sensing elements of piezoceramic material in a balanced and floating configuration to provide enhanced rejection of electrical noise associated with many industrial environments. 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 1200 +/-200 pC/psi
Avg Temp Coeff of Sensitivity 0.08% / Deg F Nominal
Frequency Response 2 Hz To 8,000 Hz
Dynamic Range 0.28 x 10-4 to 10 psi (191 dB SPL Max.)
Transducer Capacitance 6,300 pF +/-10%
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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