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.

Built to UK, EU and international standards, the Optimus+ Green environmental noise meter can be used anywhere in the world and is compatible with our range of outdoor measuring kits, making it the comprehensive solution to your environmental noise monitoring needs.


The comprehensive solution for environmental noise

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

If you are working to the UK Control of Noise at Work Regulations or the EU Physical Agents (Noise) Directive, the Leq View gives you the information that you need.

The LAeq and LCPeak values are measured at the same time which allow the LEP,d (LEX,8h) and the Peak Action Levels to be determined.

The LCeq-LAeq (C-A) value is also measured which can be used to select PPE using the HML method. LAE is also measured along with LZPeak for regulations that use this rather than LCPeak.

OSHA,MSHA & other regulations

If you need to meet regulations such as OSHA HC & NC, MSHA HC or ACGIH, the two "virtual" noise meters in the Dose View can be quickly configured to provide you with this information.

The Quick Setup gives access to a number of preset functions including OSHA HC & NC, OSHA HC & ACGIH and MSHA HC & EC.

The custom settings can be used to choose any other setup or configuration that you may need. Once you've chosen the setup needed it will be stored so each time you use the meter you will have the information you need.

For the two "virtual" noise meters, the LAVG, TWA, % Dose and Estimated % Dose are displayed.

Octave Band Filters for Noise Control & Selecting Hearing Protection.

The A,B and C instruments 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.

NR & NC values & curves on screen.

The D variants add 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.

Download and analyse your data, and create comprehensive reports

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.


  • A comprehensive noise measurement device, it includes everything you need for environmental noise measurements
  • Large screen makes the data incredibly easy to read
  • Lightweight and easy-to-hold shape designed for ease of use
  • Available as either a Class 1 or a Class 2 instrument
  • No complicated setup procedure – just switch on, calibrate and start measuring
  • Bluetooth connectivity, allowing you to use your device with a compatible smartphone
  • Environmental health officers
  • Health and safety officers and consultants
  • Acoustic consultants
  • Airport and aircraft noise monitoring
  • Construction site noise monitoring
  • Wind farm noise monitoring
  • Entertainment venue noise monitoring
  • Measuring other environmental noise sources

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)

Measurement Functions

CR:1720 & CR:1710

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%

Measurement Run Time

Integrators 2 & 3: TWA, Dose%, Est Dose%

14 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

Ln Values: 14 independent statistical values

Audio recording during measurement

CR:172A & CR:171A

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)

NR & NC values & curves

Measurement Run Time

Integrators 2 & 3: TWA, Dose%, Est Dose%

14 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 Octave Bands:Overall Leq & Leq Time History for each band, NR & NC values & curves

Ln Values: 14 independent statistical values

Audio recording during measurement

CR:172B & CR:171B

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)

NR & NC values & curves

Measurement Run Time

Integrators 2 & 3: TWA, Dose%, Est Dose%

Leq LF (20Hz to 200Hz)

14 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

Ln Values: 14 independent statistical values

Audio recording during measurement

CR:172C & CR:171C

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.

What our customers say..

The Optimus enables me to simultaneously get all the noise data I need, assess arising noise issues, make decisions, act on them immediately and record what's happening.

Chris Selkirk (TechIOA)

It is a first class instrument and should be the prime tool of all environmental and occupational health officers...

Dr Philip Dickinson, Professor, Massey University, New Zealand

Product Datasheets


Which Optimus+ Green is right for you?

There are eight variants in the Optimus+ Green range of sound level meters: four with Class 2 performance and four with Class 1 performance. For the measurement of environmental noise exposure, it is highly recommended that a Class 1 sound level meter be used.

The table below shows the different versions and options available with each instrument.

Instrument Class 1 Class 2 Sound Level Leq/Peak TWA/Dose Data Logging & Timers VoiceTag Acoustic Fingerprint Tonal Noise Detection Ln values 1:1 Octave Bands 1:3 Octave Bands NR/NC Curves Software Support 3G/GPRS Modem Support Measurement Kit
CR:1720   Yes Yes Yes Yes Yes Yes Yes   Yes       Yes Yes CK:1720
CR:1710 Yes   Yes Yes Yes Yes Yes Yes   Yes       Yes Yes CK:1710
CR:172A   Yes Yes Yes Yes Yes Yes Yes   Yes Yes   Yes Yes Yes CK:172A
CR:171A Yes   Yes Yes Yes Yes Yes Yes   Yes Yes   Yes Yes Yes CK:171A
CR:172B   Yes Yes Yes Yes Yes Yes Yes   Yes Yes Yes Yes Yes Yes CK:172B
CR:171B Yes   Yes Yes Yes Yes Yes Yes   Yes Yes Yes Yes Yes Yes CK:171B
CR:172C   Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes CK:172C
CR:171C Yes   Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes Yes CK:171C

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