• High Sensitivity
  • Wide Frequency Response
  • High Temperature To +500 Deg F
  • Electrically Isolated
  • 2-Pin Connector
Download Spec Sheet

The Columbia Model 938 High Intensity Acoustic Sensor (Microphone) is designed for the measurement of gas-borne sound in the frequency range of 2 Hz to 15KHz in industrial applications requiring operation up to +500 Degrees Fahrenheit. The unit is constructed for use in corrosive environments which are compatible with the type 316 stainless steel diaphragm. The stainless steel MILstyle connector combined with the all-welded construction provides a true hermetic seal.

Electrically, the Model 938 transducer comprises 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 differential input amplifier. Consult the factory for customized versions of this sensor.

With Connector Mated or Protected, Unit is Hermetically Sealed.


Charge Sensitivity 800 pC/psi +/-15%
Frequency Linearity +/-6 dB, 2Hz To 15,000 Hz
Avg Temp Coeff of Sensitivity 0.08% / Deg F
Dynamic Range 0.28 x 10-4 To 10 psi
Transducer Capacitance 8100 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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