Long-term noise monitoring system Larson Davis SoundAdvisor™ NMS045

Long-term noise monitoring system Larson Davis SoundAdvisor™ NMS045 is available in a variety of configurations to meet your long-term monitoring needs.

I. Specifications of Sound monitoring system Larson Davis SoundAdvisor™ NMS045

• Long-term noise monitoring system Larson Davis SoundAdvisor™ NMS045 shares many of the same benefits as Portable Noise Monitoring System Model NMS044, from 24/7 connectivity to continuous power capabilities, designed to simplify your testing.
• Now, the key elements of the portable system are available in a permanent setup, encased in a fiberglass enclosure mounted to a permanently placed pole.
• When you need to monitor the same location long-term, the Larson Davis SoundAdvisor™ NMS045 is the right choice for you.

MEASUREMENTS SIMPLIFIED

• Rugged Reliability – an environmental protected enclosure and durable mounting options create an easy-to-maintain solution for your permanent monitoring
• Installation Simplicity – a range of installation options coupled with a low power design allows you to run your system with a battery charged via a solar panel or through an AC main
• Flexible Placement – when AC power isn’t available or is costly to run, remote deployment is simplified with solar powered options
• Connectivity is Key – 4G cellular, WiFi, or wired networks allow you to control your meter and view your data from anywhere.

APPLICATION

Larson Davis knows permanent noise monitoring requirements vary. We have made the Long-term noise monitoring system NMS045 highly flexible yet still easy to use. It is ideal for applications such as:

• Permanent Airport Noise Monitoring – NMS045 allows airports to meet their requirements for long term noise monitoring, delivering a broad scope of measurement data continuously
• Long-Term Construction Noise Monitoring – When construction will be a long term long project, NMS045 is a permanent monitoring solution offering durability and protection against vandalism and damage, so your measurements can continue uninterrupted
• Permanent City Noise Monitoring – Whether you are monitoring near a bridge, busy street, factory, or nightclub, NMS045 helps you continuously measure noise levels, providing the data to create a more pleasant and ordinance-compliant community.

NOISE MONITORING SYSTEM OPTIONS

Larson Davis offers both handheld and portable outdoor systems utilizing the same core technology as the Model NMS045. Click below to learn more:

• SoundAdvisor Model 831C Sound Level Meter
• SoundAdvisor Model NMS044 Portable Noise Monitoring System.

II. Firmware for Long-term noise monitoring system Larson Davis SoundAdvisor™ NMS045

From Octave Band Analysis to Event Detection and Alerts

REVERBERATION TIME MEASUREMENTS

Model: 831C-RA

• Reverberation times are used in architectural acoustics applications ranging from simple experimental reverberation time determination for room performance, to calculating absorption coefficients for material performance. SoundAdvisor™ with 831C-RA firmware measures decays and then computes reverberation time according to ISO or ASTM standards. When using the Interrupted Noise method, the SoundAdvisor not only triggers the data acquisition, but its built-in Noise Generator can be used to drive the omni-directional sound source. Integrated Impulse method is also available. Measurements can be made using 1/3 octaves or full octave bands. The meter computes the decay times automatically, shows the T20 and T30 spectra superimposed, computes seven (7) quality indicators per frequency, and grades the measurement data.
• The resulting data and decays can be exported to the G4 LD Utility or can be processed further in DNA for reverberation time, absorption coefficients, or sound insulation calculations.

MEASURED SOUND RECORDING

Model: 831C-SR

• Measuring sound levels is a well-accepted way to objectively quantify the noise radiated by a product in an environmental survey. Rather than rely simply on the objective data, why not record a sample of the sound to truly determine the source of the noise?
• The firmware 831C-SR option enables the SoundAdvisor to record audio files in a raw format (.wav) for lossless recording or with .ogg compression to reduce file size. Listen live or to recordings from the meter, or listen to recordings from G4 LD Utility Software or LD Atlas Mobile App. Record audio of automatically triggered events, at the beginning of each Measurement history, manually, or with logic level input.

OCTAVE BAND ANALYSIS

Model: 831C-OB3

• In many applications, it is important to acquire both the broadband level and spectral content of noise data. With spectral information, the source and content of the measured level can be better understood. Constant percentage bandwidth filters (1/1 or 1/3 octave) best approximate human perception of sound.
• Option 831C-OB3 firmware enables simultaneous real-time measurement of 1/1 and 1/3 octave Leq, Lmax, Lmin along with all the ANY LEVEL™ broadband parameters. Option 831C-OB3 is compliant with IEC 61260:2014 Class 1 and ANSI S1.11-2014 Class 1 standards covering the entire frequency range of human hearing: 6.3 Hz to 20 kHz for 1/3 octave bands.
• When 831C-OB3 is combined with Time History Logging (831C-LOG) or Automatic Event Detection and Event History (831C-ELA), it is possible to review the frequency content of logged data or specific events.

FFT SOUND AND VIBRATION ANALYSIS

Model: 831C-FFT

When higher frequency resolution than 1/3 octaves is needed, FFT Frequency Analysis Model 831C-FFT is the ideal solution. The narrow-band filtering provided by Fast Fourier Transform (FFT) Analysis of single-channel acoustic or vibration sources is useful for machinery analysis, product development, source detection, tonality measurement, fault analysis, and vibration troubleshooting. Offering precision spectral analysis of signals, FTT acquisition settings can be adjusted to visualize specific acoustic and vibration phenomena. Using FFT on the handheld Larson Davis SoundAdvisor™ 831C Sound level meter is a convenient way to achieve an objective measurement of tones or vibration phenomena in the field.

Tonality Standards Supported

• ISO/PAS 20065:2016
• ISO 1996-2:2007 Annex C
• ISO 1996-2:2017 (ISO/PAS 20065).

ACOUSTIC PARAMETER LOGGING

Model: 831C-LOG

The Sound level meter Larson Davis SoundAdvisor™ 831C can be used to record the evolution of sound pressure level over time as a Time History (TH). The Time History is then used to profile the observation period, which can vary from several seconds to continuous monitoring.

With the addition of Time History Logging Firmware (831C-LOG), users can pre-select from logging periods as small as 20 ms to a full 24 hours. Parameter selections consist of familiar acoustic metrics as well as non-acoustic metrics, such as battery condition, outdoor microphone performance, and meteorological data (831C-WTHR).

LOGGED FOR OBA FILTER

(Selected Frequency and Time Weighting Parameters for 1/1 and 1/3 Octaves)

• Leq
• Lmin
• Lmax
•  

LOGGED FOR A, C, AND Z WEIGHTINGS (VARIABLE W)

• Lweq
• Lwpeak
• LwSmax
• LwFmax
• LwImax
• LwSmin
• LwFmin
• Lwlmin
• LwS
• LwF.

OTHER PARAMETERS

• LCeg - LAeg
• LIeg - LAeg
• Statistics (Ln)
• Battery
• Temperature
• External Power
• Wind Speed
• Gust Direction
• Gust Speed
• Avg Temp
• Max Temp
• Min Temp
• Avg Humidity
• Max Humidity
• Min Humidity.

MEASUREMENT HISTORY

Model: 831C-ELA

• While Time Histories are typically logged at one sample per second, longer- term averages are often useful to see trends, e.g., 10 minute or hourly averages. 831C-ELA firmware enables Measurement History (MH) and logs these parameters similar to Time History (TH) over a longer interval time. MH and TH can run together simultaneously or independently.
• Data for each measurement or location is saved in a unique MH record and may include the Leq, Lmax, Lmin, SPL, and statistical distribution of the SPL (Ln). A complete set of MH records then can be stored in a single measurement that keeps all the noise survey data in a single file. Finally, an automated sound recording at the beginning of each MH period can be achieved with 831C-SR firmware.

AUTOMATIC EVENT DETECTION AND ALERTS

Model: 831C-ELA

In Sound level meter Larson Davis SoundAdvisor™ 831C, events are defined as one of the following:

• Exceedance of a fixed threshold level for a minimum duration
• Exceedance of a dynamic threshold level for a minimum duration
• External trigger set by the digital input signal.

With 831C-ELA firmware, event definition is defined by you – including threshold level, duration, and event continuation period when the SPL drops below the threshold level for a specific period of time. Triggering status icons identify event progression and qualification (see graph above).

SoundAdvisor™ 831C can automatically generate an email alert to provide fast notice of any noise exceedance. The event alerts can be sent to a user configurable list of email addresses or by text message using an email to MMS gateway. Email event sound recording in conjunction with option 831C-SR.

NOISE MONITORNING SCHEDULING TOOLS

Model: 831C-SCH

• Data and alerts are often needed only on certain days or specific times. With 831C-SCH firmware, schedule run/stop times, modem usage, and alert type and recipient. Together with the optional event feature, 831C-ELA, trigger levels and alert recipient can be adjusted for time of day or day of the week. In conjunction with 831C-SW firmware, schedule power to the modem - conserve power when the modem is not needed.
• With the graphical interface in G4 LD Utility software, easily configure SoundAdvisor™ 831C to measure and report only what you need, even when those needs change.

Example of an 831C-SCH schedule with daily Run/Save times (green), two alert recipients on weekdays (orange), three alert levels (red), a special weekend schedule, and the modem “waking up from” low power consumption mode every weekday evening (purple).

CELLULAR COMMUNICATION

Model: 831C-SW

• We understand how beneficial it can be to have access to your noise monitor at any time of the day. Due to the remoteness or need to setup contracts and get permits, connecting a noise monitor to a wired network or main power just isn’t feasible.
• With option 831C-SW you can connect the Sound meter Larson Davis SoundAdvisor™ 831C by USB directly to a Sierra Wireless gateway and get a highly portable noise monitor that can easily be powered by battery and/or solar. We recommend the Sierra Wireless model RV50X because of its low power usage and industrial design.

III. Remote noise monitoring access service for Noise monitoring system Larson Davis SoundAdvisor™ NMS045

Access Noise Data Anywhere | SoundLink Software Service

• The Larson Davis SoundLink Service enables remote access worldwide by removing technological barriers that previously hampered attempts to implement remote noise monitoring. SoundLink reduces labor costs, simplifies data gathering, and allows for remote status monitoring and quick responses to noise concerns.

• SoundLink works by using the Internet to download data onto a device. Use any service provider or plan to balance operational costs without compromising reliability. Seamless Integration with the G4 LD Utility makes working with a SoundLink-connected noise monitor as easy as a directly connected meter.
• The SoundLink solution securely encrypts all data sent via the Internet, making noise monitoring visible only to those with VPN security keys. When configured for SoundLink, noise monitor network connection is made using a VPN to access a cloud server. The monitors are then available at a fixed IP address on the VPN. Data is stored on your own computers ensuring complete control. Access to SoundLink connected noise monitors can be shared with up to 5 simultaneous users, making the meters available where needed.

IV. Standard delivery set of Larson Davis SoundAdvisor™ NMS045

Technical specifications of Long-term noise monitoring system Larson Davis SoundAdvisor™ NMS045