Outdoor Noise Monitoring Systems Rental

Outdoor Noise Monitoring Kits

Note: 831C-based and 821ENV-based models are recommended, unless you already own a system and wish to expand with legacy models.

Kit Model	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
KNMS048	821ENV	✓	-	-	Built-in	-	-
KNMS048-SLA	821ENV	✓	-	✓	Built-in	-	-
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 831C and 821ENV 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.

Learn more about available microphones.

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
For 831C meters	PRM831
For 821ENV meters	PRM821
Low noise for LxT meters	PRMLxT1L
For LxT meters	PRMLxT1H
For 831 meters	PRM831

Power Options

40 h continuous when solar insolation > 2kW•h/m2/day

Use	Battery Type	831 Battery Life
Handheld with 831C	4x Internal Alkaline AA Batteries	8 h
Handheld with 831C	4x Internal Lithium AA Batteries	18 h
Handheld with 821ENV	Built-in Rechargeable Battery	40 h
Short Term with 831C and Weatherproof Case	8x D cell	5 d
Short Term with 821ENV and Weatherproof case	12x D cell	5 d
Short Term with 821ENV and Weatherproof Case	21AH SLA Battery (BAT011)	7 d
Continuous with Solar 821ENV or 831C and Weatherproof Case	Solar panel with 21AH SLA battery (BAT011)	continuous when solar insolation > 2kW•h/m2/day

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 and NMS048, Built-in to system
Light-duty, short-term use for attended measurements	TRP001
Heavy-duty, unattended tripod	TRP003