Model: EX378B02

$1,500.00 USD
(Pricing valid in US only)


Intrinsically safe 378B02 microphone and preamplifier, ATEX, IECEx, ETL approved

INDUSTRY EXCLUSIVE 1/2" prepolarized condenser microphone system. It is Hazardous Locations & Explosive Atmospheres compliant and can safely be employed in gaseous hazardous environments where standard microphones may cause a spark and fire. 

The EX378B02 includes a 1/2" Free-field microphone cartridge, preamplifier with TEDS, and system calibration,  compliant with Intrinsic Safe

  • Nominal Microphone Diameter: 1/2"
  • Frequency Response Characteristic: Free-Field
  • Frequency Range: (±2dB) 3.75 to 20000 Hz (3.75 to 20000 Hz)
  • Inherent Noise: 15.5 dB(A) re 20 µPa
  • Dynamic Range: 137 dB re 20 µPa

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Nominal Microphone Diameter1/2"1/2" 
Frequency Response Characteristic (at 0° incidence)Free-FieldFree-Field 
Sensitivity50 mV/Pa50 mV/Pa[2] 
Sensitivity (±1.5 dB)-26 dB re 1 V/Pa-26 dB re 1 V/Pa[2] 
Frequency Range (±2 dB)3.75 to 20000 Hz3.75 to 20000 Hz 
Frequency Range (±1 dB)7 to 10000 Hz7 to 10000 Hz 
Lower Limiting Frequency (3 dB)1.0 to 3.0 Hz1.0 to 3.0 Hz 
Inherent Noise15.5 dB(A) re 20 µPa15.5 dB(A) re 20 µPa[1] 
Dynamic Range (3% Distortion Limit)137 dB re 20 µPa137 dB re 20 µPa[1] 
Temperature Range (Operating)-40 to +176 °F-40 to +80 °C 
Temperature Coefficient of Sensitivity (+14 to +158°F (-10 to +70°C))0.005 dB/°F0.009 dB/°C[1][2] 
Static Pressure Coefficient-0.013 dB/kPa-0.013 dB/kPa[1][2] 
Humidity Coefficient of Sensitivity (0 to 100%, non-condensing)±0.001 dB/%RH±0.001 dB/%RH[2] 
Influence of Axial Vibration (0.1g (1 m/s²))63 dB re 20 µPa63 dB re 20 µPa[1] 
Polarization Voltage0 V0 V[3] 
Excitation Voltage20 to 30 VDC20 to 30 VDC 
Constant Current Excitation2 to 20 mA2 to 20 mA 
Output Bias Voltage10 to 14 VDC10 to 14 VDC 
Maximum Output Voltage±7 Vpk±7 Vpk 
Output Impedance<50 Ohm<50 Ohm 
Housing MaterialStainless AlloyStainless Alloy 
Electrical ConnectorBNC JackBNC Jack 
Mounting Thread (Grid)0.5 - 60 UNS0.5 - 60 UNS 
Size - Diameter (with grid)0.52 in13.2 mm 
Size - Diameter (without grid)0.50 in12.7 mm 
Size - Height (with grid)4.02 in102.1 mm 
Size - Height (without grid)3.99 in101.2 mm 
Weight1.87 oz53 gm[1] 

All specifications are at room temperature unless otherwise specified.


Product Notes
[1] Typical.
[2] re 250 Hz
[3] Prepolarized
[4] Venting through Preamp.
[5] See PCB Declaration of Conformance PS172 for details.
ACS-63Calibration (with TEDS) of Precision Condenser Microphones and Preamplifiers together (mated pair).(1)
Optional Versions:
No optional versions
Product Documents
Additional Downloads