OM225 Semi-permanent Outdoor Microphone Class 2

OM225 semi-permanent outdoor microphone is developed by BSWA Tech for outdoor noise monitor. Semi-permanent outdoor microphone has no built-in calibration device and therefore requires periodic calibration using a sound calibrator for short-term noise measurement.

OM225 outdoor microphones have been specially designed to achieve the free-field frequency response both in 0° and 90° direction of incidence within the limits of Class 2. It’s suitable for aircraft, airport, urban, traffic and industrial noise measurement. Each microphone is supplied with an individual calibration certificate that contains the actual sensitivity and free-field frequency response data for the complete set of outdoor microphones. Users can use the calibration data to correct the measurement data for more accurate results.

OM225 meets the IP54 ingress protection rating. The 90mm windscreen, internal rain hood and dust mesh can fully protect microphone to against wind, rain, snow, dust and other severe weathers. The bird spike prevents impact of perching birds to the measurement.

Product Features

  ● Meet the requirement of Class 2 both in 0° and 90° direction of incidence without correction

  ● Delivered with Individual calibration data

  ● IP54 enclosure to against rain, dust and perching birds

  ● The protection kit can be quickly remove for calibration

  ● ICCP power supply, low inherent noise, typical noise level is approx. 23dBA


  ● Aircraft and airport noise measurement

  ● Urban, traffic and industrial noise measurement

  ● Acoustic measurement in severe weathers

Technical Parameters
Type OM225
Application Aircraft, airport, urban, traffic and industrial noise measurement
Incidence 0° and 90°
Standard GB/T 3785.1-2010 2级, IEC 61672-1:2013 Class 2, ANSI S1.4-1983 Type 2
Built-in Microphone 1/2” prepolarized measurement microphone
Sound Field Free-field
Open-circuit Sensitivity 40mV/Pa
Frequency Response 20Hz~12.5kHz (According to IEC 61672-1)
Dynamic Range 23dBA~136dBA(40mV/Pa)
Peak SPL 139dBA peak
Maximum Output Voltage 5Vrms
Inherent Noise ~23dBA
Output Impedance <30Ω
Power Supply ICCP power supply (2mA~20mA,4mA Typ.)
Conditions Temperature: -30℃~80℃, Humidity: 0%~95%RH
Connector BNC
Mounting Thread 1/4” thread
Enclosure IP54 (Microphone vertical placement only)
Size(mm) Φ90x222 (without extension rod), Φ90x372 (with extension rod)
Weight 89g (without extension rod), 203g (with extension rod)

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