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DJB Instruments UK Ltd
High intensity piezo-electric microphone

High intensity piezo-electric microphone

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High intensity piezo-electric microphone

Product catalog summary

Specifications:

Charge vs. pressure capability up to 500 bar.
Wideband temperature calibration range from -50°C to +300°C.
Proof pressure testing for transducers and transducer/cable assemblies up to 150 bar.
Hermetic connectors available in Microdot, TNC, and 7/16 UNS 2 pole configurations.
Integral hardline cable termination and case isolated signal for common mode rejection (CMR).
Nominal charge sensitivity of 5nC/bar, vibration compensated, with a maximum temperature of 250/300°C.

Product Features:

High intensity piezo-electric microphones available in models M/02/F, M/02/FA, M/02/T, and M/02/TA.
Pressure/charge/conversion mode D33 compression with specific mounting hole configurations.
Half-size version of the M/01 model, offering doubled acoustic bandwidth but with a 14dB reduction in sensitivity.
Application areas include air blast measurement, combustion gas acoustic measurement, and fluid flow dynamics.

Stability:

Piezo-ceramics exhibit logarithmic sensitivity decay over time, with initial sensitivity loss upon exposure to high pressure and temperature.
Stability is high, with a sensitivity decay of 1-2% per year, provided initial conditions are not exceeded.
Transducers should be thermally and load cycled to minimize long-term degradation.

Environmental Considerations:

Signal outlet options are available for extreme operating conditions, including fluid immersion and environments hazardous to cabling.
Cable armoring may be necessary to protect against electrical interference.

Technical Data:

Pressure sensitivity: 4/6 nC/bar at 20°C.
Vibration sensitivity: 23 pC/g max for M/02/F,T and 2.5 pC/g max for M/02/FA,TA at 20°C.
Capacitance: 1.4/1.9 nF for M/02/F,T and 2.8/5.0 nF for M/02/FA,TA.
Resonant frequency: 90 kHz for M/02/F,T and 70 kHz for M/02/FA,TA.
Temperature range: -50°C to +250°C, with pressure/vibration sensitivity deviation of -5% at -50°C and +15% at +250°C.
Maximum static working pressure: 200 bar.
Case material: Stainless steel 303 S31.
Weight: 46 gm (F), 70 gm (T), 56.5 gm (FA), 77 gm (TA).
Connector: Microdot socket with 10/32 UNF thread.
Case seal: Welded, hermetic diaphragm.

Catalog excerpts

High intensity piezo-electric microphone-1

Pt. NoM/02/F,T M/02/FA,TA >charge vs. pressure up to 500bar >wideband temperature calibration-50/+300踰C >proof pressure test of transducers,transducer/cable assemblies to 150bar Pressure sensitivity nC/bar @ 20C4/6 Vibration sens. pC/g @ 20аC23 max2.5 max Capacitance nF1.4/1.92.8/5.0 Resonant frequency kHz9070 Temperature range C-50 /+250Press./ Vib. -5 % @ -50аC >hermetic Microdot, TNC and 7/16 UNS sensitivity deviation re 20C+15% @ +250аC 2 pole connectors >integral hardline cable termination >case isolated signal for cmr Max static Wkg. pressure, bar200 Case materials/steel 303 S31 Weight gm46 (F), 70 (T)56.5 (FA), 77 (TA) ConnectorMicrodot skt. 10/32 UNF thd. Case sealwelded, hermetic diaphragm >

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