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Rion NA-37A Class 1 Environmental Noise Monitor

The NA-37A provides a solution to the age-old problem of discriminating between noise generated by different sources by detecting their location and movement direction. The NA-37A enables permanent/long-term noise monitoring to demonstrate compliance with noise limits even when the unprocessed soundfield contains significant contributions from extraneous sources of noise. If you want to discriminate between the contributions from different noise sources for noise management purposes in a complex noise environment the NA-37A can provide a complete monitoring and data management solution.>

The Rion MS-11 Outdoor Microphone and NA-83 Sound Level Meter (part of the NA-37 system but also available separately as a front end to a long-term noise monitoring system) achieve full IEC 61672 Class 1 performance with the weather protection in place. The MS-11’s remote calibration system is unique. Instead of employing an electrostatic actuator, which could potentially cause damage to the microphone if moisture was present, the MS-11 has an integrated sound source which produces 114 dB at 1000 Hz at the microphone diaphragm when activated.>

  • Leq, Lmax, LAmin and instantaneous sound pressure level stored every 100 msec
  • 110 dB linearity range
  • Multiple data transfer options: USB A, USB B, RS 232 and LAN (FTP Server capability with NX-37A
  • System components: NA-37 (controls the system and communications), NA-83 (sound level meter and measuring amplifier for MS-11), MS-11 (outdoor microphone), AN-37 (sound discrimination unit), NX-37A (environmental noise processing program)
  • Standard data capacity (for storage within NA-37/NX-37A) at least one month in the meter
  • Distinguishes between aircraft noise, surface noise, moving noise sources, stationary noise sources
  • Automatic level check function using MS-11 internal sound source
  • MS-11 standard half inch configuration facilitates external calibration with standard acoustic calibrator
  • MS-11 microphone includes heating element to counteract condensation
  • NX-37WR option records each sound event as MP3 or uncompressed wav file (user defined) and/or periodic samples of the noise environment
  • Data from one or multiple NA-37s can be viewed, downloaded, compiled, stored and analysed using the Rion AS-40PA1 software
  • AS-40PA1 software:
    • Tabulation, editing, storing and report creation based on data from 1 or more NA-37s;
    • Data expressed as useful environmental noise indices (LAeq, LAmax, LN percentile noise levels, LDN, LDEN)
    • The user can choose to include or exclude data from analyses based upon location of sound source
    • The user can choose to exclude or include events from analyses manually (after listening to an audio recording of the event, for instance, if NX-37WR has been used)
    • Clicking on an audio recording icon on the time history of a measurement starts playback of audio file
    • Daily, weekly and monthly reports easily prepared and individual events quickly and easily identified and evaluated
  • The NA-37 with the NA-83 and MS-11 is IEC 61672 Class 1 compliant with the weather protection in place on the microphone