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NMS044 SYSTEM
NMS044 SYSTEM
 
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Rent Outdoor Noise Monitoring Systems

Rental Options for Outdoor Noise Monitoring Kits

Need to perform a short-term noise measurement? Want to try out a new product? Or only have operational budget available for your project? Renting a noise monitoring system is a great option.

Outdoor noise monitoring systems rented from The Modal Shop are highly customizable. All include a meter, power source, and environmentally protected enclosure. See charts below for available systems, microphones, preamplifiers, and more. Contact our team with any questions or for guidance on which system will best fit your needs. Note that we provide selection sheets linked in the left-hand column of this page to help ease the rental process.

All kits come with Larson Davis Integrating Sound Level Meters capable of

  • Time History Logging (for fast data from 100 ms to 24 hr)
  • Measurement Intervals and Excedences (for long term trending over time, from 1 min to 24 hr)
  • Selectable time and frequency weightings

Models 831 and 831C also add the ability to measure with multiple weightings simultaneously.

 

Outdoor Noise Monitoring Kits

Kit Base Meter Model 1/1 and/or 1/3 Octave Bands Event Sound Recording Solar Panel Tripod Included Remote Connection Weather Sensor
NMS044-SLA100 831C Built-in Optional
NMS-831C-L 831C - - Optional Optional Optional
NMS-831C 831C - Optional Optional Optional
NMS-831C-H 831C Optional Optional Optional
NMS-831L 831 - - - - Optional
NMS-831 831 - - - Optional
NMS-831H 831 - - Optional
NMS-SE-FF LxT - - - - -
NMS-SE-RI LxT - - - - -
 

Which Microphone Should I Use for Outdoor Noise Monitoring?

Free Field - Designed to be used when the field of measurement is open and not filled with hard, reflective surfaces (in other words, when the measurement is being taken in an open area). There are two ways of using a free field microphone:

  • Pointed directly at the sound source of interest, for example when getting a sound profile for a piece of equipment or making sound power measurements
  • Placed in the center of all sound sources and pointed 90 degrees away (up) – for example in many environmental studies, National Park studies, traffic studies, or construction noise studies when the surrounding environment is wide open.

Random Incidence - Designed to measure a sound field with multiple sources in multiple directions. Used in reflective areas, random incidence microphones react equally to pressure waves from every direction. Typical applications include

  • Indoor crowd noise
  • Building acoustics (classroom, theater, sanctuary)
  • Sound chambers

Pressure Field - Designed to measure the sound pressure in front of the diaphragm. Pressure microphones typically allow for a greater dynamic range, and have a very flat response across the full frequency spectrum.  The pressure microphones offered by TMS for rent feature low sensitivity that allows the noise monitoring system to measure higher dB levels without overloading.

  • Indoor/outdoor gun ranges, ballistics testing
  • High intensity work sites (e.g. pile-driving)
  • Monitoring very loud machinery or systems

Note that 831 and 831C meters can apply measurement corrections to account for a specific microphone or the presence of an environmental shroud. LxT meters can apply a correction to a free-field microphone for random incidence response and to a random incidence microphone for free-field response.

Microphone Description Model Number Response
General Purpose (Traffic, etc.) 377B02 Free Field
High Level (Factory, etc.) 377C10 Pressure Field
Extremely High Level (Ballistics at near range, etc.) 377A12 Pressure Field
Random Incidence to Full Hearing Range (For reverberant spaces and inside vehicles) 377A21 Random Incidence
Extremely Low Level (National Parks, sanctuaries, etc.) 378A04 Free Field

*Microphone range varies with meter used, preamplifier, etc. Contact our rental team for more details.

 

Preamplifier Options for Outdoor Noise Monitoring

Purpose Model Number
Low noise for LxT meters PRMLxT1L
For LxT meters PRMLxT1H
For 831 meters PRM831
For 831C meters PRM831C

 

Power Options

Use Model Number Size Battery Type LxT Battery Life 831 Battery Life 831C Battery Life
Handheld - - 4x Internal Alkaline AA Batteries 16 h 13 h 8 h
Handheld - - 4x Internal Lithium AA Batteries 30 h 24 h 18 h
Short Term EPS042 Small 8x D cell 17 d 9 d 5 d
Continuous with Solar EPS044-SLA100 Medium Solar panel N/A N/A continuous when solar insolation > 2kW•h/m2/day
Long term (no solar) EPS037 Large 100 Ah 28 d 28 d 19 d

 

Options for Connectivity (831C-based models only)

Type of Connection Model Number
WiFi for close proximity wireless (e.g., when the meter is in a fenced area or on a high pole) DVX014
Cellular Modem for temporary or permanent installations with wireless gateway and data SIM COM-RV50-DC-U
USB to Ethernet Adaptor for permanent Ethernet-based data connection DVX012
USB Multi Port hub for multiple USB devices, including connectivity, USB storage, GPS, and more DVX015
 

Sync Sound and Weather Data

Various weather parameters can be collected and synced with other measured data. Parameters that can be measured may include wind speed, gust speed, direction, temperature, humidity, and barometric pressure. The Modal Shop rents these sensors as kits (denoted by the "K" prefix in the model number). Kits include

  • Selected weather sensor (SEN031 or SEN032)
  • Cable to mate weather sensor, batteries, and meter
  • Necessary hardware adaptors for tripods and cabling
Purpose Model Number Wind (Speed & Direction) Temperature Humidity Barometric Pressure Rain Rate Hail Rate
Multi-parameter KSEN031
Wind speed and direction  KSEN032 - - - - -


Tripod Options

Purpose Model Number
Monopod NMS044 only, Built-in to system
Light-duty, short-term use for attended measurements TRP001
Heavy-duty, unattended tripod TRP003