Mesure du bruit ambiant

Environmental Noise Monitoring

The XL2 Sound Level Meter provides the dedicated solution for environmental noise monitoring in industry and communities. It measures levels and detailed spectral information in parallel and stores the data on an SD card for post-processing and reporting. A linear audio file (wav-file) may be recorded for detailed simultaneous analysis.

At a glance

  • Noise annoyance assessment
  • Rating level calculation
  • Verifying boundary noise level emission


The type approved class 1 sound level meter offers a flexible handheld instrument with accurate and reliable measurements. Data recording can be scheduled to occur at pre-determined times or automatically triggered when pre-determined levels are exceeded.

XL2 Measurement Functions

XL2 with M4260 Measurement Microphone

XL2 Sound Level Meter

Sound Pressure Level SPL

XL2 monitors the noise pollution to verify any annoying or excessive noise. All sound levels such as actual, Lmin, Lmax, Leq and the sound exposure level LAE are simultaneously measured and logged with frequency weighting A, C, Z and time weightings Fast, Slow and the optional Impulse.

The event recorder functionality triggers the measurement by programmable level thresholds or manually by the external input key pad. (optional with Extended Acoustic Pack).

Rating Level Lr

Assesses the annoyance at a noise source according ISO 1996-2. The rating level Lr is calculated by the noise exposure corrected with different factors for an increased annoyance as follows:

Lr = LAeq + KI + KT + KR + KS
KI Correction factor for impulses
KT Correction factor for tones and information content
KR Correction factor for the time of the day
KS Correction factor for special situations and noise sources

These correction factors are standardized and differ between countries. The detailed FFT analysis provides the results for the KT factor.

Percentiles (optional)

Measures statistic sound levels in wideband and the real time spectrum 1% - 99%.

Application Examples:
  • Road Traffic Noise
  • Industrial Noise
  • Noise Pollution Level LNP = Leq + (L10 - L90)

Remote Measurement (optional)

Allows querying the XL2 measurement data online via the USB interface. Thus customers may integrate the XL2 into their noise monitoring application.

Outdoor Measurement Microphone M2230-WP

Outdoor Measurement Microphone
Le microphone de mesure d'extérieur M2230-WP est un microphone d'extérieur protégé contre les intempéries pour le sonomètre XL2. Il facilite l'acquisition de données dans les applications de surveillance du bruit dans un environnement extérieur. Le boîtier en polymère anticorrosion, le pare-vent, la membrane hydrofuge et le pic anti oiseaux offrent une excellente protection contre la pluie, le vent, la poussière et les oiseaux. Le M2230-WP se compose d'un microphone M2230 intégré dans un kit de protection contre les intempéries WP30.


  • Conforme aux normes IEC 61672 Classe 1 et ANSI S1.4 Type 1 pour l'incidence verticale et horizontale du son.
  • Excellente protection contre la pluie et la poussière (IP54), le vent et les oiseaux.
  • Construit à partir de matériaux inoxydables
  • Montage standard sur trépied de 3/8"
  • Sac de transport extérieur robuste disponible en option.
  • Partie supérieure amovible pour faciliter l'étalonnage du microphone

Microphone de classe 1e

Le microphone d'extérieur M2230-WP répond à la norme IEC 61672 Classe 1 ainsi qu'aux exigences ANSI S1.4 Type 1 pour l'incidence verticale du son. Pour se conformer à l'incidence horizontale du son, une correction spectrale est utilisée dans le sonomètre XL2 associé.

Protection extérieure efficace

Le pare-vent de 90 mm protège le microphone de mesure M2230 de la pluie et de la poussière tout en réduisant le bruit induit par le vent d'environ 15 dB. La conception sans couture de la membrane déperlante sous le pare-vent assure une protection parfaite contre la pluie et la poussière.

Conception robuste / Etalonnage facile

La partie supérieure du kit de protection contre les intempéries est clipsé et peut donc être facilement retirée à la main pour un étalonnage pratique et rapide du microphone de mesure.

Basic Outdoor Case

Basic Outdoor Case
The Basic Outdoor Case is a simple and efficient solution for outdoor noise monitoring. Powered either by an external mains supply or a small, high capacity battery pack the case is more than adequate for a number of days of monitoring. The robust and lightweight design protects the XL2 and accessories from a wide range of inclement weather conditions.

NTi Audio #:
  • IP43: 600 000 471
  • IP63: 600 000 473

Heavy Duty Outdoor Case

XL2 Outdoor Case
The heavy duty outdoor case is a professional solution for short- and medium term unattended noise monitoring. The case provides comprehensive protection against dust, water and impacts. Internal dimensions provide ample space for battery packs to power the XL2 Sound Level Meter.

NTi Audio #:
  • IP43: 600 000 476
  • IP65: 600 000 477
Product Data

Noise Monitoring Terminal

Noise Monitoring Terminal

The weatherproof enclosure is the tailored fixed installation solution for unattended noise monitoring. The enclosure is IP66 rated, highly secure and constructed of strong, hard-wearing reinforced fiberglass.

NTi Audio #: 600 000 480

Product Data

Type Approval Option

L'option d'homologation de type, lorsqu'elle est installée sur votre XL2, le transforme en XL2-TA, sonomètre pour les mesures certifiées. Le XL2-TA, combiné au microphone M2230 et à l'étui de protection, forme un sonomètre homologué offrant des performances de classe 1 conformément aux normes IEC 61672:2014, IEC 61260:2014, ANSI S1.4:2014, ANSI S1.4:2014 et ANSI S1.11:2014.

Configuration du sonomètre homologué:

  • Sonomètre XL2-TA (XL2 avec l'option d'homologation de type installée)
    • Micrologiciel V3.11
    • Optionnel: Option Pack acoustique étendu
    • Optionnel: Clavier d'entrée XL2
  • Microphone de mesure M2230
  • Housse de protection MXA0101

Certificat d'homologation de type du XL2-TA

Local Noise Monitoring Network

Multiple XL2 Analyzers connect with USB Device Servers via LAN or WLAN within a local network for online noise monitoring. An individual Projector Software may be started for each XL2 Analyzer, thus simultaneously displaying all XL2 screens on the PC monitor. Each XL2 Analyzer can be controlled from the host PC.

XL2 Noise Monitoring Network

Individual Solution programmed by Customer

The Remote Measurement Option allows querying of the XL2 measurement data online via the USB interface. Multiple XL2 Analyzers can be implemented into a customer specific noise monitoring solution. The XL2 acts as a front end device for sound level measurements.



Exel Set for Environmental Noise Monitoring

Exel Kit for Environmental Noise Monitoring

  • XL2 Sound Level Meter
  • Extended Acoustic Pack for XL2
  • M2230 Measurement Microphone
  • ASD Cable for XL2
  • Mains Power Adapter
  • Exel System Case

Optional as required:

Weather Protection WP30

for outdoor noise assessments

Type Approval Option for XL2

for type approved measurements and certification

Precision Calibrator

for accurate noise measurements

Remote Measurement Option for XL2

for querying measurement data online from the PC

Stack Light

for visual (pre-) warning indication

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