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Integrating Sound Level Meter for Noise at Work

integrating sound level meter hire

With measurement of LAeq and LCPeak, the Optimus Red Sound Level Meter is ideal for noise at work measurements.


  • Noise at Work Assessment
  • Machinery noise checks
  • Alarm sound level testing

Main Features

  • Integrating Class 2 (as required by the noise at work regulations)
  • Measures LAeq and LCPeak along with many more parameters
  • Standards: IEC 61672 Class 2, IEC 60651 and 60804 Type 2

Hire Kit Includes

  • Sound Level Meter and Calibrator
  • Calibration Certificates
  • Carrying Case
Hire Period:


The Optimus Red is a Class 2 Integrating Sound Level Meter, making it ideal for most noise at work and general purpose noise assessments.

This version of the meter does not include data logging or software. The sound levels (LAeq and LCPeak for noise at work) are simply read from the meter's display.


It is essential that a sound level meter meets the correct standards for any measurements that could be used for the protection of hearing or any other legal reasons.

The Optimus Red meets the correct standards for noise at work measurements (see Applications section). If you are unsure of the standards required for other regulations then please call or email for advice.

Noise at Work

This sound level meter is the correct specification for all noise at work assessments being carried out in line with the EU regulations and the UK HSE guidelines. These regulations demand the use of an integrating sound level meter that meets IEC 61672 standard to Class 2. The meter is capable of measuring LAeq and LCpeak.

The meter also measures the C weighted Leq (LCeq), which can be used for a basic hearing protector assessment - checking that the level at the ear is reduced adequately. For a more detailed hearing protector assessment with the assistance of software please see the CK162C Optimus Red meter.

General Purpose Noise Measurement

The Optimus Red is suitable for any general purpose noise measurement that demands the use of a Class 2 Sound Level Meter or Class 2 Integrating Sound Level Meter.

If your measurement guidelines don't mention standards then this meter should also be adequate, but please check with us first if you have any doubts.


The noise at work regulations state that the meter's calibration should be checked before and after making measurements.

Put the Calibrator on the mic. and select the Calibrate option.

Keep a record of all calibrations to meet the noise regulations.


Press the [Start] key to start a measurement. Once the measurement is complete (e.g. the average sound level has settled) press the [Stop] key.

All parameters are stored for viewing on the meter's display.

CR162A Specifications

These specifications are for the CR162A Optimus Red Sound Level Meter, which is included in the CK162A rental kit.

StandardsIEC 61672-1:2013 Class 1 or Class 2
IEC 61672-1:2002 Class 1 or Class 2 Group X
IEC 60651:2001 Type 1 I or Type 2 I
IEC 60804:2000 Type 1 or Type 2
ANSI S1.4 -1983 (R2006), ANSI S1.43 - 1997 (R2007), ANSI S1.25:1991
Measurement Range20dB to 140dB RMS single range
Noise floor<18dB(A) Type 1, <21dB(A) Class 2
Frequency weightingsRMS & peak : A, C, & Z measured simultaneously
Time weightingsFast, Slow & Impulse measured simultaneously
IntegratorsThree simultaneous “virtual” noise meters. Integrator 1 is preset to Q3 for Leq functions. Integrators 2 & 3 can be configured with the following
Exchange rate3, 4 or 5 dB
Threshold70dB to 120dB (1 dB steps)
Time weightingNone or Slow
Criterion level70dB to 120dB (1 dB steps)
Criterion time1 to 12 hours in 1 hour steps
Integrator quick settingsEU, OSHA HC & OSHA NC, OSHA HC & ACGIH, MSHA HC & MSHA EC, Custom
Size283mm x 65mm x 30mm
Power4 x AA alkaline
Typically 12 hours with alkaline AA
Typically 20 hours with lithium AA non-rechargeable
External power: 5v-15v via MultiIO socket via ZL:171 cable (2.1mm socket)
AC & DC output via ZL:174 (2 x Phono, 1m)
Multi-pin IO for external power via ZL:171 cable (2.1mm socket)
CaseMaterial: high impact ABS-PC with soft touch back and keypad
Tripod mount1/4" Whitworth socket
EnvironmentalTemperature: Operating -10°C to +50°C, storage -20°C to +60°C
Humidity: Up to 95% RH non-condensing
Electromagnetic performanceIEC 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 OptionsEnglish, French, German, Spanish, Italian
Display functionsLXY, LXYMax, LXYMin, LXeq, LCPeak, LZPeak, LCeq-LAeq, LXE
Graph of short LAeq, LCPeak, TWA, dose%, est dose%
Measurement run time