• High Sensitivity
  • Wide Frequency Response
  • High Temperature To +500 Deg F
  • Choice of Pipe Thread or Straight Thread Mounting
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The Columbia Series 939 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. These units are constructed for use in corrosive environments which are compatible with the type 316 stainless steel diaphragm. The miniature 10-32 fused-glass coaxial connector combined with the all-welded construction provides a true hermetic seal.

Electrically, the Series 939 transducers comprise sensing elements of piezoceramic material, the low side of which are electrically common with the stainless steel housing. Consult the factory for customized versions of this sensor.

With Connector Mated or Protected, Unit is Hermetically Sealed.


Charge Sensitivity 1200 +/-200 pC/psi
Frequency Linearity +/-6 dB, 2 Hz To 15,000 Hz
Avg Temp Coeff of Sensitivity 0.08% / Deg F
Dynamic Range 0.10 x 10-4 To 10 psi
Transducer Capacitance 12,000 pF +/-10%
Insulation Resistance 100 Megohms Min., 50 VDC Test
Isolation Resistance 0 (Case Grounded)
Dielectric Strength 550 Vrms, 60 Hz, Element to Housing
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