The Optimus Red sound level meter is for measuring sound levels in factories and other work environments in line with the UK and EU occupational noise regulations.
Let the meter take the strain - The Optimus Red has been designed specifically for noise at work measurements. Rather than being a general purpose meter that leaves you trying to select the correct measurement range and parameters, the Optimus Red does it all for you, measuring all the measurements that you might need now and in the future.
Lower cost meters are available (even within our range), but they will not usually meet the IEC 61672 standard and will not be Integrating as required for occupational noise measurement. They will certainly not be so powerful or easy to use.
The noise at work regulations state that you should use at least a Class 2 Integrating Sound Level Meter that provides you with measurements of LAeq and LCPeak. The meter should be verified by a suitably equipped laboratory when new and at least every two years. You also need a Calibrator to check the meter's function before making measurements.
For basic occupational noise measurements, we recommend the standard Optimus Red Class 2 (order code CR162A) with Calibrator (order code CR514). These parts can be ordered together as Noise Measurement Kit CK162A.
If you prefer to have data logging with download to a computer and reporting, please see the Optimus Red with Data Logging. For more detailed analysis and hearing protector selection see the Optimus Red with Octave Band Filters.
The Optimus Red Sound Level Meter measures all the parameters that are needed for an occupational noise survey. What's more, it measures them all at the same time, so there is no need to work out which measurements you need before starting.
It measures all parameters at the same time in a single measurement span:
The meter's display shows the main parameters that are needed when making noise at work measurements: LAeq (average sound level), LCPeak (maximum peak level) and the current sound level. With a button push or two, it can also show more detail, such as LEPd, exposure, memory and calibration status.
The bar on the left of the display shows the current level, changing to yellow and then red when the sound level goes above the defined action levels (usually 80dBA and 85 dBA).
The Optimus Red was designed specifically for noise at work measurements in line with the EU regulations. It provides all the noise measurement parameters that you need in a meter of the correct grade.
The overall process for making noise at work measurements conists of:
The regulations and guidelines state that the meter's calibration should be checked before making measurements, and that you should keep records of these calibration checks.
Fit the Calibrator over the microphone as shown, switch it on and press the Calibrate button. The meter will automatically make any adjustments.
To start a measurement, simply press the Start key, shown on the right.
The meter will start measuring the LAeq and LCPeak (the main parameters needed for Noise at Work), along with a few other useful parameters.
When you are happy that you have measured for long enough (the LAeq has settled for example), simply press the Stop key.
Many occupational noise regulations recommend a second calibration check, at the end of the measurement process. This ensures the meter's performance hasn't difted since the start.
When sound levels are found to be high, you must now calculate worker noise exposure. This is done using the measured LAeq and the length of time the worker is exposed for.
There are not too many options for the Optimus Red sound level meter, as even the basic model includes all the parameters that you need for noise at work measurements in line with the EU directives. The data logging and octave band options can be added at a later date without having to return the meter, so you can decide later if you are unsure at the moment.
The main options are:
The most important of the accessories is the Calibrator. The regulations state that you should use one to check the function of the meter before and after making any measurements.
A Class 1 sound level meter is a little more accurate than a Class 2 model. It is also more expensive. If you are using the meter exclusively for occupational noise measurements then the regulations are quite clear: Class 2 is adequate. For this reason we recommend the Class 2 model.
However, if you need to make other noise measurements, such as noise emitting from your factory into the local environment, then it might be wise to go for a Class 1 meter. In these instances the local authority (Environmental Health Officer for example) will usually expect measurements made with a Class 1 meter.
There are many models of sound level meter in the Optimus range, from a basic sound level meter to an advanced data logging, integrating meter with 1/3 octaves and many analysis modules. The most common additions to the Optimus Red are for data logging (download to a computer) and octave band filters. If you are unsure at this stage then these options can be added at a later date, some remotely and some by returning the meter to us.
With this option fitted the meter stores a summary of each measurement along with a time history (gives a graph of the noise levels throughout the measurement). It comes with software and download cable.
A very useful option as it makes storing results and presenting reports easier. This option can be added at a later date without returning the meter.
If you need this option then please see the Optimus red with Data Logging page.
With this option fitted, the meter splits the spectrum into bands to provide information about the frequency content. Meters with the Octave Band option always have the Data Logging option fitted too.
The option is very useful when monitoring areas with very high noise levels. The octave band measurements are used by the software to calculate the level at the ear when wearing different hearing protectors. This option can be added at a later date without returning the meter.
For this option please visit the Optimus Red with Octave Band Filters page.
|Standards||IEC 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|
|IEC 61252:1993 personal sound exposure meters|
|ANSI S1.4 -1983 (R2006), ANSI S1.43 - 1997 (R2007), ANSI S1.25:1991|
|IEC 61260:1996 & ANSI S1.11-2004|
|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 octave bands, 31.5Hz to 16kHz (with octave band option fitted)|
|Time weightings||Fast, Slow & Impulse measured simultaneously|
|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|
|Size||283mm x 65mm x 30mm|
|Power||4 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)|
|Outputs||AC & DC output via ZL:174 (2 x Phono, 1m)|
|Multi-pin IO for external power via ZL:171 cable (2.1mm socket)|
|Bluetooth BLE compatible with Anrdoid and iOS devices|
|Case||Material: high impact ABS-PC with soft touch back and keypad|
|Tripod mount||1/4" Whitworth socket|
|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, Italian|
|Display functions||LXY, LXYMax, LXYMin, LXeq, LCPeak, LZPeak, LCeq-LAeq, LXE|
|Graph of short LAeq, LCPeak, TWA, dose%, est dose%|
|Measurement run time|
|where x=A ,C ,Z; y= F, S, I|