Optimus+ Environmental Sound Level Meter

Sound Level Meters

The Optimus+ Green Environmental Sound Level Meter has been specifically designed for measuring and monitoring exposure to noise pollution and environmental noise sources.

  • Periodic LAeq and Ln values (e.g. L10, L90), LMax and LMin
  • Easy to use, measures all parameters simultaneously
  • Choose a Class 1 or Class 2 model
  • VoiceTag audio notes and audio recording
  • Available with tonal noise detection, 1:1 octaves or 1:3 octaves
Instrument class *

Choose the Class of meter you would like

Meets IEC 61672-1:2013

Meets IEC 61672-1:2013

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SKU: CR17xC
Tag: Sound Level Meters

Description

Optimus+ Environmental Sound Level Meter

Environmental noise level measurement made easy

The top-of-the-range Optimus+ Green has been specifically designed as an environmental noise meter and is perfect for measuring and monitoring exposure to noise pollution and environmental noise sources, including construction sites, windfarms and industrial operations.

Available as either a Class 2 or Class 1 sound level meter, built to IEC 61672, the Optimus+ Green environmental noise meter provides everything you need to measure both occupational and environmental noise, to the fullest extent. Capturing the full range of sound parameters simultaneously, there’s no other noise measuring instrument you need to measure and monitor exposure to environmental noise.

All Optimus+ Green environmental noise meters are integrating data logging instruments, providing noise data such as sound pressure level (SPL), Leq and Peak and TWA/Dose. Optional measurement parameters include 1:1 and/or 1:3 octave band filters, tonal noise detection, Ln values, and on-screen NR/NC curves.

Need to measure noise outside?

Built to UK, EU, and international standards, the Optimus+ Environmental Noise Meter can be used anywhere in the world and is compatible with our range of weatherproof outdoor measuring kits, making it the comprehensive solution to your environmental noise monitoring needs whatever conditions you need to measure noise in. You can choose an outdoor kit with or without a modem for unattended measurements.

VoiceTag | Audio Note Recording

Each of our data logging Optimus+ Sound Level Meters feature VoiceTag audio note recording, increasing the ease with which your NoiseTools database can be organised. Before each measurement, simply speak into the microphone to provide additional information such as the location of your reading. Once your measurement data is downloaded to NoiseTools, these audio notes are automatically converted into text.

Acoustic Fingerprint | Audio triggering, recording & alerts

Each of our Optimus+ Green Sound Level Meters feature Acoustic Fingerprint technology, allowing you to automatically record and store audio by configuring a set of detection templates and rules. You can store audio recordings as either 96kHz/32bit quality, 48kHz/24bit quality, or as standard 16kHz/16bit bit quality which can be used for replay and source identification.

When used with the Outdoor Environmental Noise Kit with Remote Access, the Optimus+ Green Sound Level Meter can communicate remotely and provide both data download and live noise information to NoiseTools. GPS location data is also provided allowing noise measurements to be stamped with the location, date and time.

Pattern Approval

The Class 1 variant of this meter has PTB Pattern Approval, and LNE Pattern Approval. See the Downloads tab for our certificate. Pattern Approval is a method where a test laboratory such as the PTB tests an instrument against a set of standard tests to ensure that it meets the performance claims of the manufacturer. Find out more here.

The Optimus+ Environmental Sound Level Meter Range

The Optimus+ Environmental Sound Level Meter is available in four models designed for various environmental noise monitoring activities. Upgrade this instrument at any time by contacting our team of experts.
Environmental Sound Level Meter
Optimus+ Green

This instrument provides everything you need to measure both occupational and environmental noise, to the fullest extent. Capturing the full range of sound parameters simultaneously, there’s no other noise measuring instrument you need to measure and monitor exposure to environmental noise.

Class 1 LNE or PTB approved models available
Choice of standard, high and studio audio quality
Periodic LAeq and Ln values, LMax and LMin
Timers and repeating measurements
Environmental Sound Level Meter
Optimus+ Green with Octave Bands

The Optimus+ Green Environmental Noise Meter with Octave Band Filters is perfect for measuring and monitoring both environmental noise, noise nuisance, and occupational noise.

Class 1 LNE or PTB approved models available
Choice of standard, high and studio audio quality
Real-Time 1:1 Octave Band Filters
Timers and repeating measurements
Environmental Sound Level Meter
Optimus+ Green with 1/3 Octave Bands

The Optimus+ Green Environmental Noise Meter with 1/3 Octave Band Filters is ideal for environmental noise measurement and monitoring, where detailed analysis of noise frequency and tonal analysis is a requirement.

Class 1 LNE or PTB approved models available
Choice of standard, high and studio audio quality
Real-Time 1:1 and 1:3 Octave Band Filters
Timers and repeating measurements
Environmental Sound Level Meter
Optimus+ Green with Tonal Noise Detection

Optimus+ Green Environmental Noise Meter with Tonal Noise Detection is ideal for when a detailed analysis of tonal environmental noise is required.

Class 1 LNE or PTB approved models available
Choice of standard, high and studio audio quality
Tonal noise detection in 1:3 octaves
Timers and repeating measurements
We Recommend

Environmental Noise Monitoring

Watch the product video to find out how the Optimus+ Sound Level Meter makes environmental noise assessments easier than ever

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The comprehensive solution for environmental noise

The top-of-the-range Optimus+ Green has been specifically designed as an environmental noise meter and is perfect for measuring and monitoring exposure to noise pollution and environmental noise sources.

Find out more about the importance of environmental noise monitoring and discover other ways that Cirrus Research can help.

Comprehensive measurement capability

The overall Leq, Lmax and statistical Ln% values are measured along with a range of sound profiles providing a complete picture of the environmental noise under octave bands

The B & C versions of the Optimus+ Green environmental sound level meter provide real time 1:3 octave band filters from 6.3Hz to 20kHz with the overall data stored alongside the time history or noise profile for each band.

Acoustic Fingerprint™ triggers and audio recording

As well as the VoiceTag™ recording, Optimus+ Green noise meters provide audio recording during measurements using the Acoustic Fingerprint™ technology.

Recordings can be started either manually or automatically when user-defined triggers are activated.

Audio recordings can be stored either as Studio (96kHz/32bit) quality which can be used for later analysis, or as Standard (16khz/16bit) quality which can be used for replay and source identification.

Tonal noise detection

The D variants use either the ISO1996-2: 2007 Simplified Method or the Cirrus Improved Method to highlight tonal noise in 1:3 octave bands.

Repeating measurements

Measurements can be either started manually or automatically by the measurement control functions.

This allows the instruments to make repeated measurements over long periods of time, ideal when the instrument is used with an outdoor noise measurement kit.

Outdoor Measurement Kits

Where there is a need to measure noise levels outdoor or over long periods, the Optimus+ Green sound level meters can be used with the CK:675 and CK:685 outdoor measurement kits.

These kits comprise a weatherproof case which contains the instrument and battery pack(s) along with an interface to external power and USB.

The kits also include the MK:170 outdoor microphone which provides weather protection for the microphone capsule and connects via a 10m cable to the main enclosure.

The CK:685 also contains a 3G/GPRS modem and GPS location receiver which allows the noise measurement data to be downloaded remotely to the NoiseTools software via the MyCirrus cloud system.

UK & EU Noise at Work Regulations

The C & D models also feature real-time octave band filters which will measure the noise in 10 different frequency bands.

The octave band measurement is made at the same time as the other measurements and includes the overall level in each band along with a time history of the bands across the measurement period.

OSHA, MSHA and other regulations

The D model adds NR & NC values and curves to the 1:1 octave band measurements. This information can be useful in checking the performance of HVAC systems and noise levels in rooms.

Octave Band Filters for Noise Control & Selecting Hearing Protection

The D model adds NR & NC values and curves to the 1:1 octave band measurements. This information can be useful in checking the performance of HVAC systems and noise levels in rooms.

NR & NC values & curves on screen

The D model adds NR & NC values and curves to the 1:1 octave band measurements. This information can be useful in checking the performance of HVAC systems and noise levels in rooms.

All variants of the Optimus+ Green sound level meter are integrating data logging instruments. As such, you’ll automatically get access to our licence-free software, NoiseTools. You’ll be able to keep a record of your measurements, analyse your data in detail, and create comprehensive reports to help you make better decisions. If you choose the Optimus+ Green with 1:1 octave bands, NoiseTools can also recommend the most appropriate form of hearing protection for your team, based on your data.

You can upgrade this instrument to a more advanced version of the Optimus+ Green at any time, future-proofing your investment.

Applicable Standards

  • IEC 61672-1:2013 Class 1 or Class 2
  • IEC 61672-1:2002 Class 1 or Class 2 Group XIEC
  • IEC 60651:2001 Type 1 I or Type 2 I
  • IEC 60804:2000 Type 1 or Type 2
  • IEC 61252:1993 Personal Sound Exposure Meters
  • ANSI S1.4 -1983 (R2006), ANSI S1.43 – 1997 (R2007)
  • ANSI S1.25:1991
  • 1:1 & 1:3 Octave Band Filters to IEC 61260 & ANSI S1.11-2004

 

Type Approvals for Class 1 Instruments

  • LNE-25387-1 IEC 61672-1:2013
  • NF EN 61672-1:2014
  • IEC 61260:1996
  • NF EN 61260:1996
  • LNE-25387-0
  • EN 61672-1:2003
  • PTB-1.53-4052960 DIN EN 61672-1:2003-10
  • DIN EN 61672-2:2004-08
  • DIN 45657:2005-03
  • Applus+ 02-001-B-62/13-R
  • UNE-EN 61672-1:2005

 

Microphone

Class 1 MK:224 pre-polarized, Class 2 MK:216 pre-polarized

Microphone Preamplifier

MV:200 Removable Preamplifier (All versions)

Total Measurement Range:

20dB to 140dB RMS Single Range

Noise Floor: <18dB(A) Class 1, <21dB(A) Class 2 Frequency Weightings

  • RMS & Peak : A, C, & Z Measured Simultaneously
  • Frequency Bands: 10 x 1:1 Octave Bands (31.5Hz to 16kHz, A, B & C variants)
  • Frequency Bands: 36 x 1:3 Octave Bands Measured (6.3Hz to 20kHz, B & C variants)
  • Frequency Bands: 33 x 1:3 Octave Bands Displayed (12.5Hz to 20kHz, B & C variants)
  • Additional Metrics: LAeq LF (20Hz to 200Hz) & Leq LF (20Hz to 200Hz)

 

Time Weightings

Fast, Slow & Impulse Measured Simultaneously

Display

High resolution OLED display. Ambient light sensor & illuminated keypad

Memory

4GB with 32GB factory fit option

AuditStore

Measurement verification data stored in secure memory

Time History Data Rates (Global settings)

10ms, 62.5ms, 125ms, 250ms, 1/2 sec, 1 sec, 2 sec (User selectable)

VoiceTag Audio Recording

Up to 30 seconds of audio notes with each measurement

Bluetooth

BLE compatible with Android and iOS devices.

Cirrus mobile applications available from Google Play and the App Store

Acoustic Fingerprint Audio Recording

Off, Manual, Threshold Triggered, Advanced Trigger

User options:

  • Studio Quality – 96kHz/32bit WAV format
  • Standard quality – 16kHz/16bit WAV format
  • Pre-Trigger function

 

Integrators

Three simultaneous “virtual” noise meters. Integrator 1 is preset to Q3 for Leq functions. Integrators 2 & 3 can be configured with the following:

  • Exchange Rate: 3, 4 or 5 dB
  • Threshold: 70dB to 120dB (1 dB steps)
  • Time Weighting: None or Slow
  • Criterion Level: 70dB to 120dB (1 dB steps)
  • Criterion Time: 1 to 12 hours in 1 hour steps

 

Integrator Quick settings

  • EU, OSHA HC & OSHA NC, OSHA HC & ACGIH, MSHA HC & MSHA EC, Custom 1 & Custom 2
  • Ln Statistical Values
  • 14 independent statistical Ln values calculated from 1/16th LAF
  • 7 preset to L1.0, L5.0, L10.0, L50.0, L90.0, L95.0 & L99.0
  • 7 user defined Ln values. CR:172C & CR:171C allow for an additional 14 Ln values with independent time and frequency weighting.

 

Measurement control

  • Measurement control with user selectable duration of manual, 1 min, 5 min, 10 min, 15 min,30 mins, 1 hour, Lden
  • Automatic Synchronisation & Repeat
  • Pause & Back Erase with user selectable duration

 

Dimensions

Size: 283mm x 65mm x 30mm

Weight: 300gms/10oz

Batteries

4 x AA Alkaline

Battery life

Typically 12 hours with Alkaline AA

Typically 20 hours with Lithium AA Non-Rechargeable

Battery life is dependent upon the battery type, quality & screen brightness

Connections

  • USB Type B to PC
  • AC & DC Output via ZL:174 (2 x Phono, 1m)
  • Multi-pin IO for external power via ZL:171 cable (2.1mm socket)
  • External Power: 5v-15v via MultiIO socket via ZL:171 cable (2.1mm socket)
  • Tripod Mount
  • 1/4″ Whitworth socket

 

Case

Material: High Impact ABS-PC with soft touch back & keypad

Environmental

Temperature: Operating -10°C to +50°C, Storage -20°C to +60°C

Humidity: Up to 95% RH Non Condensing

Electromagnetic performance

  • IEC 61672-1:2002 & IEC 61672-2:2003
  • IEC 61672-1:2013 & IEC 61672-2:2013
  • Except where modified by EN 61000-6-1:2007 & EN 61000-6-1:2007

 

Language options

English, French, German, Spanish. Other language options may be available

Software Support

NoiseTools Download, Configuration & Analysis software supplied as standard. Compatible with Microsoft Windows XP, Vista, 7 & 8 (32bit & 64bit)

Displayed Functions

  • LXY, LXYMax, LXYMin, LXeq, LCPeak, LAPeak, LZPeak, LCeq-LAeq, LXE, LAIeq
  • Graph of Short LAeq, LCPeak
  • Integrators 2 & 3: TWA, Dose%, Est Dose%
  • Real-Time 1:1 Octave Bands (Graphical & Numeric)
  • Real-Time 1:3 Octave Bands (Graphical & Numeric)
  • Tonal Noise Detection in 1:3 Octave Bands
  • NR & NC values & curves
  • Measurement Run Time
  • Integrators 2 & 3: TWA, Dose%, Est Dose%
  • Leq LF (20Hz to 200Hz)
  • 28 Statistical Ln values

 

Stored Functions

  • LXYMax & Time History of LXYMax
  • LAeq, LCeq, LZeq, LCPeak, LZPeak, LAPeak, LAIeq
  • Time History of LAeq, LCeq, LZeq, LCPeak, LZPeak, LAPeak, LAIeq
  • Integrators 2 & 3: LAVG, TWA. %Dose
  • Time History of LAVG
  • 1:1 & 1:3 Octave Bands:Overall Leq & Leq Time History for each band, NR & NC values & curves
  • Tonal Noise Detection in 1:3 Octave Bands
  • Ln Values: 28 independent statistical values
  • Audio recording during measurement
  • where x=A ,C ,Z; y= F, S, I
  • Other functions may calculated by the NoiseTools software and displayed on download.

Additional information

Weight 0.30 kg
Dimensions 28.3 × 6.5 × 3.0 cm
Applications

Occupational Noise

Environmental Noise

Hardware Features

Compatible Applications

Memory

,

Power Supply Options

Average Operating Time

Sound Measurement Features

Applicable Standards

,

Type Approvals

,

Total Measurement Range

Frequency Weightings

, ,

Time Weightings

, ,

Data Logging

Minimum Data Logging Interval

SPL

Leq

LCPeak

Ln Values

%Dose

1:1 Octave Bands

1:3 Octave Bands

Tonal Detection

NR/NC Curves

Audio Recording

VoiceTag Audio Notes

Acoustic Fingerprint

Brand

Cirrus Research

Monitoring Duration

Short-term

Optimus+ Green Sound Level Meter

User Manual

Optimus+ Green Sound Level Meter

Datasheet (English)

Optimus+ Green Sound Level Meter

Datasheet (Chinese)

Optimus+ Green Sound Level Meter

LNE Certificate

Optimus+ Green Sound Level Meter

PTB Certificate

CR171C Sound Level Meter

PTB Certificate

Optimus+ GPS Module

User Manual

Optimus+ GPS Module

Datasheet

  1. Chris Rush

    The reliability and accuracy that the Optimus Green provides us with is essential to ensure our noise impact assessments are correct

  2. Chris Selkirk

    Simply put, Optimus Green is the easiest device to use and get the information I need quickly

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