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|