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Sound Level Meters

CEL246 Data Logging Integrating Sound Level Meter

Overview

The CEL246 is a data logging integrating sound level meter that meets the international standards to Class 2 / Type 2, as required by many noise measurement standards. It measures and stores the Leq (integrated average) along with the Fast or Slow sound level and comes with both A and C frequency weightings.

  • Canadian, European and other noise at work regulations - Leq
  • USA regulations (OSHA) occupational noise surveys - Lavg
  • Logs the sound level every 1 second
  • Lightweight but rugged case
  • 2 year warranty
  • Calibration certificate included

Standards

  • IEC 61672 Class 2
  • IEC 60651 and IEC 60804 Type 2
  • ANSI S1.4, ANSI S1.43 Type 2

The CEL246 meets the strict demands of the international sound level meter standards and is provided with a Calibration Certificate at no extra cost, so you can make your noise measurements with confidence. This is most important when using a meter in a hearing protection and conservation program.

An AC output and optional DC output mean this meter can be connected to a level recorder, PC equipped with an A/D converter or integrated with another data logging system.

See Specifications page for more details about the standards and noise measurement range.

Integrating - Averaging Sound Level Meter

A standard (non-integrating) sound level meter gives an instantaneous reading of the sound level. In an environment where the sound levels are changing continuously, as most are, it can be very difficult to average this by eye. The solution is to use an Integrating sound level meter such as the CEL246, which will give you a reading of Leq, which is the average sound level.

Due to the risk of underestimating the average sound level, especially if you fail to take into account the logarithmic nature of the decibel, many regulations advise or even demand the use of an Integrating Sound Level Meter.

The European and UK noise at work regulations require the use of an Integrating sound level meter. Please see the notes on the Applications tab about Noise at Work and Peak (Loud Bangs) noise measurements.

Digital Technology and Graphical Display

sound level display The graphical display gives the option of viewing the sound level as a simple number (shown to the left) or as a graph, clearly showing the variation of noise over time (see main image).

The CEL246 uses the latest in digital technology - models using the older analog techniques tend to drift more over time and with temperature and air pressure changes. Sampling and digitizing the signal closer to the microphone ensures a much more stable sound level meter for repeatable measurements.

Data Logging and Download Software

The CEL246 stores the sound level to internal memory at a rate that can be set from 1 second to 10 seconds. It also stores a summary of the measurement, including start time, date, measurement duration, maximum sound level, Lavg and Leq.

Free software is included with the meter to download the measurements and transfer into Excel or similar spreadsheet.

 

Applications

The CEL246 Data Logging, Integrating Sound Level Meter is predominantly intended for the measurement of occupational noise, although it is suitable for many other applications too.

Noise at Work

When noise levels are not stable, as is usually the case with noise in the workplace, it can be very difficult to work out the average by eye. The CEL246 is an integrating sound level meter and so provides you with an average as recommended by many regulations.

The European regulations - Physical Agents (Noise) Directive 2003/10/EC - and the HSE guidelines in the UK state that you should use an integrating sound level meter, so this should be ideal (see note about Loud Bangs below).

The CEL 244 can be switched between "A" and "C" frequency weighting. These measurements can be used to assess the effectiveness of hearing protection using the HML method.

Data Logging

The data logging facility means you can leave the meter running for a longer period of time, download the measurement and then identify the noisier times of day and assess a worker's noise exposure by calculating the LEP,d.

Loud Bangs?

If your workplace has loud banging or impulsive noise then these should be assessed using a sound level meter with "C" Weighted Peak measurements, such as the CEL620A Integrating Sound Level Meter.

Typical sources of high Peak levels include punch presses, explosives, hammers, drop forge, nail gun, pistols, shotgun and fireworks.

System Integration

As system intgration via the USB interface can be complex, the CEL246 has an AC output and an optional (free of charge) DC output, making it ideal for connection to a data logging system via a suitable A/D converter.

Environmental and Community Noise

As an Integrating meter, the CEL246 is acceptable for some environmental noise assessments. However, some regulations and authorities demand the use of a more accurate Class 1 sound level meter.

Using It

The CEL246 Data Logging Sound Level Meter is controlled using just two buttons, one to the left and one to the right. The graphical display ensures that operation and the selection of options is as easy as possible.

 

switch on1. Switch On

Ensure 3 x AA batteries are fitted on press the red button to switch the sound level meter on.

After a brief warm-period of just a few seconds, the meter will show the current sound level on the display.

The exact content of the display depends on how you set the meter up last time, as it remembers these settings for your convenience.

2. Calibration Check

Some 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 on the right and switch it on. The meter automatically detects the presence and correct fitting of the Calibrator and then starts the calibration process, which only takes a few seconds.

calibration check
Calibration Check

3. Changing Settings

sound meter displayAs the meter saves its settings, you should only need to do this occasionally. The left-hand button cycles through the following main settings:

  Record Data Start recording the 1-second measurements
  Display Type Graph or numbers
  Measurement Range 30 to 100 dB or 60 to 130 dB
  Time Weighting Fast, Slow or Impulse
  Frequency Weighting "A" or "C" weighting
  Average Setting Measure Leq or Lavg

The right-hand button is used to change the current setting of any of these parameters.

 

4. Make the Measurements

You can now read the sound level from the display.

In the example on the right, the meter is set to read the Fast Sound Level (LAF). The current level is 53 dB(A) and the maximum (since last reset) is 80.9 dB(A).

Press the reset button (right-hand button) to reset the max reading or the Leq.

Measurement storage is started by pressing the left-hand button and selecting the first option, which is to record data.

Options and Order Codes

The CEL246 Logging, Integrating Sound Level Meter can be purchased on its own or with a selection of accessories. The CEL246-K Kit contains the meter, windshield, carrying case and a Calibrator, as required by many noise measurement applications.

CEL240-K noise kit CEL246-K Noise Measurement Kit: £899.00
Includes the Class 2 Logging, Integrating Sound Level Meter, Windshield, Acoustic Calibrator and Carrying Case.
   
dB24 Software dB24 Software: £50.00
Windows software that provides real-time display of sound levels.

The items are available to be purchased individually:

cel246 data logging integrating sound level meter CEL246 Logging, Integrating Sound Level Meter: £573.00
Just the Class 2 Integrating Sound Level Meter, for applications that do not require the use of a Calibrator.
cel120 calibrator CEL120/2 Sound Level Calibrator: £252.00
For checking the function of the meter before making measurements as required by many regulations.
sound level meter windshield CEL6841 Foam Windshield: £10.00
Reduces wind noise and protects the microphone.
sound level meter case CEL6840 Carrying Case: £74.00
Space for the meter, calibrator and windshield.

Specifications and Standards

The CEL246 is a "general purpose" integrating sound level meter, and so meets the international standards to Class 2 or Type 2. For any noise measurement that requires accurate, repeatable and comparable results, especially when used for hearing protection or other legal purposes, it is essential to use one that meets these standards.

 

Sound Level Meter Standards

  • IEC 61672 Class 2
  • IEC 60651 and IEC 60804 Type 2
  • ANSI S1.4 and ANSI S1.43 Type 2

Technical Specification

Measurement ranges 30 to 100 and 60 to 130 dB Storage Over 4 days of time history at 1s
Noise floor < 33dB(A)   Max 18 hours/ measurement
Time weightings Fast, Slow, Impulse Time History Rate From 1s to 10s programmable
Freq. weightings A and C    
Average Parameters Leq and Lavg Battery power 3 x AA Alkaline for >35 hours
      5V via USB Mini B socket
Dimensions 72 x 212 x 31mm, 245g    
Tripod mount 1/4" whitworth socket Operating conditions RH: 5 to 90% (non condensing)
      Temperature: 0 to 40°C
AC output 0.85V RMS @ FSD "A" weighted   Atmos. pressure 65 to 108kPa
DC output 0 to 1.3V DC for FSD on selected range    
  (free of charge option)    

Prices and Ordering

The sound level meter is available alone or as part of a Kit, which includes Meter, Calibrator and Carrying Case.

Order Code
Description
Price (GBP)
 
CEL246
Data Logging Type 2 / Class 2 Integrating Sound Level Meter
£573.00
In stock
CEL246-K
Kit with CEL246 Sound Level Meter, Calibrator, Windshield, Case
£899.00
In stock
Software
NMAPPS
NoiseMeters Applications Web Based Noise Reports
£65.00
In stock
dB24
Software for the CEL240 Series Sound Level Meters
£50.00
In stock

 

Individual items and spares for the CEL240 series meters.

Order Code
Description
Price (GBP)
 
CEL120/2
Class 2 Acoustic Calibrator
£252.00
In stock
CEL6841
Windshield for CEL240 and 600 Series Sound Level Meters
£10.00
In stock
CEL6840
Case for CEL240 and 600 Series Sound Meter and Calibrator
£74.00
In stock
PELI-SLM
Peli Case and Foam for CEL Sound Meter and Accessories
£175.00
In stock

 

We have a range of sound level meters and noise dosemeters available for hire. Email us for details.

Delivery Charges within the UK

Meters and Kits £12.00   Small Spares £6.00  

Value Added Tax - VAT

VAT is charged at 20% on all our products shipped to a UK address or invoiced to a UK address.

Contact Midas

Midas Safety Services are happy to discuss your Sound and Noise Level Testing requirements and arrange a no-obligation meeting if that would be helpful.

Please contact us on 0117 318 2163/0776 232 3367 or email chrisgray@midaselectronics.co.uk.

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CEL246 noise at work sound level meter

CEL246 Data Logging Sound Level Meter


Product List:

CEL620

General purpose sound level meter which is very easy to use.

CEL620B Octave Band sound level meter

A practical meter perfect for a detailed noise at work survey and subsequent hearing protection assessment.

CEL240

Class 2 Sound Level Meter.

CEL246

Data Logging Integrating Sound Level Meter.

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CEL633A

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CEL633C

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