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Sound Level Meters

CEL620B Octave Band Sound Level Meter

Overview

The CEL620B is an Integrating Sound Level Meter with Real-Time Octave Band Filters. This meter provides you with all the measurements needed for a full noise at work survey and detailed hearing protection assessment.

  • Occupational noise measurement
  • Hearing protection assessment (Octave Band method)
  • Data logging with download to computer
  • Quick and easy to use
  • Simultaneous measurement of all parameters (LAeq, Max, Min, etc)
  • Single range 20 to 140 dB
  • Real-Time Octave Band Filters

Standards

  • IEC 61672 - Class 1 or Class 2
  • IEC 60651 and IEC 60804 - Type 1 or Type 2
  • IEC 61260 Class 0 (Octave Band Filters)
  • European Physical Agents (Noise) Directive 2003/10/EC

Octave Band Sound Level Meter

The CEL620B provides a large set of parameters, such as "A" and "C" weighted Max, Min and Peak. As an Integrating sound level meter, it also provides the average sound level Leq. All measurements are made in parallel, which means you do not need to decide beforehand which ones you need - they are all stored.

At the same time the meter measures the Octave Band spectrum in all bands at the same time, ensuring the measurement process is quick and easy - one measurement includes all parameters, both broadband and octave.

Noise at Work Regulations

The EU noise at work regulations Physical Agents (Noise) Directive 2003/10/EC - and the UK HSE guidelines (Controlling Noise at Work) state that noise measurements should be made using a calibrated Class 2 Integrating Sound Level Meter capable of measuring the "A" weighted Leq (LAeq). For environments with loud banging noise the meter should also measure the "C" weighted Peak (LCpeak).

All the CEL620B models meet these requirements and so are perfect for a noise at work assessment. The octave band measurements can then be used to assess the suitability of hearing protectors.

Data Logging and Insight Software

The CEL620B comes complete with data logging capability with measurements stored in the meter's internal memory. When connected to a Windows computer, the meter acts like a memory card (shows as a removable drive) so the measurements can be loaded into a spreadsheet or moved to your hard drive for long term storage. There is no need to buy and install special software, which can be a real benefit on a company networks where installation of software is not encouraged.

sound meter softwareIf you want a little more than just loading the measurements into a spreadsheet then the Insight software simplifies the process of downloading the measurements, storing them in a database, managed by person, place or process criteria. To get the Insight software for the CEL620B include item ISC020 with your order.

 

Our Recommendation

For noise at work measurements where sound levels are very high, we recommend order code CEL620B2-K, which includes the Class 2 CEL620B2 and Calibrator. The standard meter is data logging and measurements can be transferred to a spreadsheet or through our NoiseMeters Applications.

Applications

As an Integrating meter available as either Class 1 or Class 2, the CEL620B has many applications. However, its primary application is for assessing worker noise exposure.

  • European Noise at Work Regulations
  • USA, Canada and most other regulations
  • Hearing protector checks (SNR, HML or Octave Band method)
  • Environmental noise surveys (see notes below)
  • Machinery testing

Most noise measurement regulations will specify the type and grade of sound level meter that should be used. Some regulations, such as the European noise at work regulations, specify that an Integrating sound level meter should be used. For others, such as the OSHA regulations in the USA, do not demand an Integrating meter, but it makes the measurement process much easier and more reliable.

Regulations should also specify whether a Class 2 or the more accurate Class 1 meter should be used. For most occupational noise assessments, including the EU and UK regulations, a Class 2 is adequate.

   
occupational noise

Noise at Work

The European noise at work regulations state that you should use at least a Class 2 Integrating Sound Level Meter. The meter should be verified by a suitably equipped laboratory when new and then at least every two years. You also need a Calibrator to check the meter's function before making measurements.

An Integrating meter like the CEL620B provides you with the measurement of the average sound level - LAeq. Rather than trying to average the sound level by eye (made more difficult by the logarithmic nature of noise), the meter does the averaging for you. The LAeq is then used to calculate the worker's daily noise exposure level, or Lep,d..

Hearing Protection Assessment

When the noise levels are particularly high (e.g. greater than 90 dBA) then you should check that the hearing protection provided is adequate. If it does not reduce the noise at the ear to an acceptable level then clearly it is not adequate. The CEL620B measures both the A and C weighted sound level, so you can use the SNR or HML method. It also has Octave Band Filters, so the more detailed Octave Band method can be used - recommended for very high noise levels or high tonal content. For a working example of the SNR, HML and Octave Band methods please take a look at our Hearing Protection Calculator.

The web based NoiseMeters Applications includes a section that uses your measurements and calculates the level at the ear when wearing different hearing protectors.

 

Environmental and Community Noise

As the CEL620B is available as either Class 1 or Class 2 and includes data logging, it is suitable for many environmental noise surveys.

However, we would recommend the CEL633 Series Environmental Sound Level Meter as this includes additional noise measurement parameters (needed for some regulations, but not all), automatic timer functions and a removable preamplifier (for use in an outdoor kit). The CEL633 meters also store a time history of the noise, giving a very useful graph of the sound level varying over time.

Occupational Noise

The CEL620B 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.

This meter can be used without a computer, reading the measurements from the screen. Even in its standard form it stores the measurements and these can be downloaded manually into a Spreadsheet (Excel or similar). The Insight software is also available for more convenient download, storage and reporting.

  • Designed for occupational noise regulations
  • Meets the required standards
  • All parameters needed: LAeq, LCPeak
  • Storing and download to computer
  • Octave Band option for detailed hearing protector assessment
  • Colour coded display for ease of use

The full occupational noise measurement process is described below.

1. Calibration Check

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 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 details are stored in the meter so that you can either make note or download them to a computer.

calibrating the meter
Calibration Check

2. Start and Stop Measurements

To start a measurement, simply press the Run/Stop key, shown on the right.

This starts the measurement and storing process for all parameters, the most important for noise at work being the LAeq and Peak. If the meter has Octave Band Filters fitted then these measurements start too.

When you are happy that you have measured for long enough (the average level has settled for example), simply press the Stop key.

start noise measurement
Starting a Measurement
stopped
Not Running

Colour Coded Display

The current state of the sound level meter can be seen at a glance.

When not running the meter shows the current sound level and the border is red.

When running the meter shows the measurement parameters such as Leq or Lavg and the border is green.

running
Running

View the Results

The measurements can be viewed on the meter's display or they can be downloaded to a computer. There are three download methods (one of which is free of charge).

The basic model (order code CEL620B2) is a Class 2 Integrating Sound Level Meter and so meets the requirements of the noise at work regulations. The main options are:

  • Class 1 or Class 2? - Most regulations say Class 2 is adequate.
  • Octave Bands? - Included
  • Accessories? - Calibrator is often essential, carrying case is useful.
  • Insight Software? - Makes download and analysis more convenient

 

Sound Level Calibrator

sound level calibrator
Calibrator
 

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 making any measurements.

Class 1 or Class 2 Sound Level Meter?

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 noise at work assessments then the EU regulations and HSE guidelines 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.


Software

The CEL620B is a data logging meter that does not require any additional software - when plugged into a computer it acts like a memory card. You can manually copy the data to your computer or load it into a spreadsheet program or you can make use of our web based NoiseMeters Applications. The Insight software option makes this process more convenient, links the measurements to person, place or process, and presents the results.


Order Codes

Sound Level Meter CEL620B2 - Class 2 Integrating Sound Level Meter with Octave Band Filters £1456.00
  CEL620B1 - Class 1 Integrating Sound Level Meter with Octave Band Filters £1924.00
Calibrator The Calibrator is available as Type 1 or Type 2, usually to match the class of the meter:  
  CEL120/2 Class 2 Sound Level Calibrator £252.00
  CEL120/1 Class 1 Sound Level Calibrator £515.00
Software NM620 NoiseMeters Applications £65.00
  ISC020 Insight Software £295.00
Accessories CEL6840 Carrying Case for CEL620 Sound Level Meter, Calibrator and accessories £74.00
  PELI-SLM Peli Case for CEL Sound Level Meter, Calibrator and accessories. £175.00

Specifications

The CEL620 data logging Integrating Sound Level Meter is available as either Class 1 or Class 2 as defined by the international sound level meter standards.

 

Sound Level Meter Standards

  • IEC 61672 Class 1 or Class 2
  • IEC 60651 and IEC 60804 Type 1 or Type 2
  • ANSI S1.4 and ANSI S1.43 Type 1 or Type 2
  • IEC 61260 Class 0 (Octave Band Filters)
  • ANSI S1.11-2004 (Octave Band Filters)

 

Using a meter that meets these standards is essential for repeatable results and especially for any measurements that will be used for legal purposes.

Technical Specifications

Measurement range 20 to 140 dB (single range), 143 dB Peak Measured Parameters  
Display 320 x 240 pixel color TFT Frequency weightings A, C and Z (simultaneous)
Output to PC USB Mini B Time weightings Fast, Slow and Impulse
    Amplitude weightings Q3, Q4 and Q5
Batteries 3 x AA Alkaline Thresholds 70 to 90 dB (applies to Lavg)
  (20 hours with backlight off)    
External Power 9 to 14V DC at 250mA Sound Level LXY, LXYMax, LXYMin
  (2.1mm connector) Integrated LXeq, Lavg, LAE
    Peak LXPeak
Measurements stored 100 Takt Max LTM3, LTM5, LXIeq
Dimensions 72 x 229 x 31mm, 295g Octave Bands LXY, LXYMax, LXeq
  2.8" x 9.0" x 1.2". 10.4oz Frequency Bands 16Hz to 16kHz in 11 bands
    Where X is frequency weighting A, C or Z
    and Y is time weighting Fast, Slow or Impulse

Prices and Ordering

Class 2 Integrating Sound Level Meter with Octave Band Filters.

Order Code
Description
Price (GBP)
 
CEL620B2
Type 2 / Class 2 Integrating Sound Level Meter with Octave Band Filters
£1456.00
In stock
CEL620B2-K
Kit with CEL620B2 Sound Level Meter, Calibrator, Windshield, Case
£1782.00
In stock
Software
NMAPPS
NoiseMeters Applications Web Based Noise Reports
£65.00
In stock
ISC020
Insight Software for CEL620, CEL630 and dBadge
£295.00
In stock

 

Class 1 Integrating Sound Level Meter with Octave Band Filters.

Order Code
Description
Price (GBP)
 
CEL620B1
Type 1 / Class 1 Integrating Sound Level Meter with Octave Band Filters
£1924.00
In stock
CEL620B1-K
Kit with CEL620B1 Sound Level Meter, Calibrator, Windshield, Case
£2513.00
In stock
Software
NMAPPS
NoiseMeters Applications Web Based Noise Reports
£65.00
In stock
ISC020
Insight Software for CEL620, CEL630 and dBadge
£295.00
In stock

 

Individual items and spares for the CEL620 series meters.

Order Code
Description
Price (GBP)
 
CEL120/2
Class 2 Acoustic Calibrator
£252.00
In stock
CEL120/1
Class 1 Acoustic Calibrator
£515.00
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
CEL6841
Windshield for CEL240 and 600 Series Sound Level Meters
£10.00
In stock

 

The CEL620B2-K Noise Measurement Kit is available for hire. The hire includes the following items

  • CEL620B2 Sound Level Meter with Real-Time Octaves
  • CEL120/2 Sound Level Calibrator
  • Carrying Case
  • Insight Software

First week: £199.00 then £25.00 for any additional days. Price includes delivery and collection.

Delivery Charges within the UK

These delivery charges are for Sound Level Meters and Noise Measurement Kits within mainland 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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CEL620B noise at work sound level meter

CEL620B 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.

Dosebadge Kits

The doseBadge is a unique solution for Personal Noise measurements.

Combinations

Noise Dosemeter and Handled Meter Combinations.

CEL633A

Environmental Sound Level Meter

CEL633C

CEL633C Environmental Sound Level Meter with 1/3 Octaves