SoundExpert® Environmental Kit
The Larson Davis SoundExpert® 821 Environmental Kit is a comprehensive solution designed for precise environmental acoustic monitoring. It combines the advanced capabilities of the SoundExpert Model 821ENV sound level meter...
Key Product Features
Model: 821ENV
Weatherproof, Lightweight, Compact Case
Flexible Powering Options
1/1 and 1/3 Octave Filters
14 to 140 dB Dynamic Range
Low Power for Weeks
Class 1 Sound Level Meter
Colour, Touch Screen Display
Included G4 LD Utility software
G4 Utility & Reporting Software
Connect, control, download, and view data from multiple devices simultaneously. Organise files and meters by project. View your data graphically and in spreadsheet format, generate reports, and easily export in Excel® format for further data analysis. Examine graphs of multiple parameters and heat maps of octave band data.
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Atlas App
Control your instrument locally via our Atlas TM app. Available for iOS and Android Users
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Cloud-Based Solutions
The Sonitus Cloud is an online reporting platform which allows customers to automate environmental compliance checks. Sonitus Systems and Larson Davis systems are compatible with our option EM20 series remote logger.
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Portable and Permanent Sound Level Meter-Based Solutions
821ENV is a Class 1 sound level meter featuring a large, responsive touch display for intuitive operation. It offers A, C, and Z frequency weightings, as well as Fast, Slow, and Impulse time weightings, ensuring comprehensive noise measurement capabilities.
Unrivalled Battery Life
When it comes to remote and long-term noise monitoring, the Larson Davis 821 sound level meter is designed for superior performance. It boasts an exceptional 2-day internal battery life, which is seamlessly extended by an additional 2 weeks of power from a built-in battery within the case.
This advanced Lithium-ion battery is specifically optimised for outdoor use, ensuring reliability in challenging environments. For added convenience, the integrated Bluetooth app allows you to remotely monitor battery levels and key data, making this sound meter the ideal choice for any long-duration project.
Extremely Lightweight
Designed for ultimate convenience and ease of use. Its lightweight and portable design means you can effortlessly carry it to any location, whether you're monitoring noise levels on a bustling construction site, a quiet residential area, or a remote outdoor environment.
This portability ensures you're not limited by bulky equipment, allowing for quick setup and efficient data collection wherever you need it.
Key Product Specifications
Leq, Lmax, Lmin, Lpeak, Ln (6 values), LDN, LDEN
Internal Storage of 8 GB Standard
Wireless Charging
Weather-proof Case
Applications
Product Accessories
Every product needs flexibility to do whatever you want it to.
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Mounting Kit Including
LD-ACC010
Weather Protected Outdoor Microphone
LD-EPS2116
Free-field Microphone
PCB-377B02
Preamplifier
PCB-PRM821
Environmental Protection Case for 821
LD-CCS061
DC Cable
LD-CBL225-01
Larson Davis Calibrator
LD-CAL1200
Larson Davis Calibrator
LD-CAL200
40Ah Battery Kit
CA-5520
Screen Protector
LD-X21-SP
Battery charger
CA-5502-CH
AC adaptor for LD721/821
CA-341
Canvas Bag
LD-CCS052
Microphone Extension Cable
LD-EXC010
DC Cable
LD-CBL241-01
USB C Cable and USB C to USB adapter
LD-CBL242-03
Windshield
LD-WS001
23Ah Battery
CA-5502
Folding Solar Panel
OGRE PP100
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Guides & Downloads Email SupportFrequently Asked Question's
What is the SoundExpert 821 Environmental Kit used for in the UK?
The SoundExpert 821 Environmental Kit is a complete solution for environmental noise monitoring in the UK, designed for applications such as construction noise surveys, environmental impact assessments, and boundary noise testing.
It combines a Class 1 SoundExpert 821ENV sound level meter with outdoor monitoring accessories, enabling accurate and reliable long term measurements in real world conditions.
What standards and regulations does the environmental kit support?
The system uses a Class 1 sound level meter compliant with IEC 61672, the key standard required for environmental noise assessments in the UK.
It is also suitable for work aligned with BS 4142, BS 5228, and ISO-based environmental noise modelling standards, supporting compliant environmental noise surveys, planning applications, and regulatory reporting.
What features does the SoundExpert meter provide for environmental noise monitoring?
The kit is built around the SoundExpert 821ENV Class 1 sound level meter, offering advanced measurements such as Leq, Lmax, Lmin, Lpeak, and Ln values, alongside 1/1 and 1/3 octave band analysis for detailed frequency insight.
It also includes touchscreen operation, environmental logging, audio recording, and Atlas app control, making it easy to capture and manage environmental noise data during surveys.
How long can the system run for environmental noise monitoring?
The SoundExpert 821 Environmental Kit is specifically designed for long-term, unattended environmental noise monitoring. While the handheld meter itself provides up to 40 hours of internal battery life for short-term use the key advantage of the kit is its external lithium ion battery system, which enables continuous operation for up to 14 days.
This extended power capability makes the kit ideal for remote deployments, boundary monitoring, and multi-day environmental noise surveys without the need for daily intervention.
When required, the system can also be supplemented with USB-C, mains power, or solar inputs, providing additional flexibility for longer monitoring campaigns.
How is environmental noise data analysed and reported?
The kit integrates with G4 reporting software, allowing users to visualise data, analyse trends, and generate professional reports using Class 1 measurement data suitable for UK compliance.
Data can be organised by project, reviewed graphically or in spreadsheets, and exported for use in environmental noise reports, planning submissions, and regulatory documentation.
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