Products > Sound Level Meters > CEL620A Occupational Noise Meter

CEL620A Integrating Sound Level Meter

CEL620A Sound Level Meter
CEL620A Sound Level Meter
CEL620A Sound Level Meter Typical Displays

Price List

Type 2 Integrating Sound Level Meter
In stock

Type 2 Kit with meter, calibrator and case
In stock
Type 1 Integrating Sound Level Meter
In stock

Type 1 Kit with meter, calibrator and case
In stock
NoiseMeters Applications Web Based Noise Reports
In stock

Insight Software for CEL620, CEL630 and dBadge

The delivery price is calculated during checkout based on your location and the goods ordered. Our basic delivery prices are:

Delivery within USA: $40.00

Delivery Service: Five working days*

* For products that are in stock and the order received by midday.

Some products go through a final configuration and calibration before being shipped. If the calibration labs are busy this can add up to two days on to the delivery schedule but guarantees a fresh calibration.

Type 2 Integrating Sound Level Meter
In stock

Type 2 Kit with meter, calibrator and case
In stock


  • Data logging with download to computer
  • Quick and easy to use
  • Simultaneous measurement of parameters (Lavg, Leq, TWA, Max, Min)
  • Single range 20 to 140 dB


  • Occupational Noise Measurement
  • Hearing Protection Assessment
  • OSHA, MSHA, ACGIH, European and other regulations

Integrating Sound Level Meter

The CEL620A provides a large set of parameters, such as "A" and "C" weighted Max, Min and Peak. As an Integrating sound level meter, the CEL620 also provides the average sound level Lavg and Leq. All measurements are made in parallel, which means you do not need to decide beforehand which ones you need - they are all stored.


  • ANSI S1.4 and ANSI S1.43 - Type 1 or Type 2
  • IEC 61672 - Class 1 or Class 2
  • IEC 60651 and IEC 60804 - Type 1 or Type 2

Occupational Noise Regulations - OSHA and Others

All the CEL620 series meters are suitable for measurement to the USA standards OSHA, ACGIH, MSHA as well as regulations from all other parts of the world. Most regulations (including OSHA) require the use of a Type 2 calibrated meter that can measure the Lavg to enable accurate TWA noise exposure calculations. The CEL620A also measures the Peak for loud banging noise along with "A" and "C" weighting for hearing protector checks.

Data Logging and Software

The CEL620A comes complete with data logging capability. Measurements are 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 network where the installation of software is not encouraged.

For occupational noise assessments you can also use our NoiseMeters Applications web based system. Measurements can be transfered to our server without the need to install software, and reports generated from within your web browser. For NoiseMeters Applications please include item NMAPPS with your order.

If 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 CEL620A include item ISC020 with your order.


As an Integrating meter available as either Type 1 or Type 2, the CEL620 has many applications. However, its primary application is for assessing worker noise exposure.

  • OSHA Occupational noise regulations (most common in USA)
  • MSHA, ACGIH noise regulations
  • Canadian occupational noise (both 3dB and 5dB exchange rates)
  • European noise at work regulations
  • 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 Type 2 or the more accurate Type 1 meter should be used. For most occupational noise assessments a Type 2 is usually adequate.

Occupational Noise

The OSHA occupational noise regulations state that you should use at least a Type 2 Sound Level Meter. The meter should be verified by a suitably equipped laboratory when new and we recommend having it checked at least every two years. You also need a Calibrator to check the meter's function before making measurements.

An Integrating meter like the CEL620A provides you with the measurement of the average Slow sound level - Lavg. 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 Lavg is then used to calculate the worker's Time Weighted Average (TWA) noise exposure.

Hearing Protection Assessment

When the noise levels are particularly high (e.g. greater than 95 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 CEL620 measures both the A and C weighted sound level, so you can use the NRR or HML method.

At higher noise levels or for very tonal noise, it is often better to use the Octave Band method to check hearing protectors. In this case you should go for the CEL620B series meters with real-time octave band filters. For a working example of NRR and HML 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 CEL620 is available as either Type 1 or Type 2 and includes data logging, it is suitable for many environmental noise surveys.

To view our recommended range of meters for this type of application, please visit our Environmental Noise page.

Occupational Noise

The CEL620 was designed specifically for occupational noise measurements in line with the OSHA, MSHA, ACGIH and 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: Lavg, TWA, LAeq, LPeak
  • Storing and download to computer
  • Color 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 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.

2. Start and Stop Measurements

To start a measurement, simply press the Run/Stop key

This starts the measurement and storing process for all parameters, the most important for noise at work being the Lavg 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.

Color 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.

3. 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 included free of charge with the meter). You can read more about these under the Software tab on this page.

Download and Software Options

The CEL620 series sound level meters all include the data logging facility. Measurements can be recalled on the meter's screen or they can be presented on a computer. The storage in this meter is very flexible, allowing us to offer some free methods of downloading measurements, or for more demanding applications a piece of commercial software is available to give access to the full power of the meter.

Measurement Viewing Methods

  • View measurements on the meter's display.
  • Download files directly to a spreadsheet (no software needed).
  • Use our NoiseMeters Applications (via your web browser).
  • Purchase the Insight Software.

NoiseMeters Applications

The web based NoiseMeters Applications runs in your browser to generate reports from your CEL620 noise measurements.

There is no software to install on your computer. You just navigate to in a web browser to access all your measurements from anywhere in the world: home, work, on vacation?

Measurements are transferred from the meter by just connecting it to your USB port (no special drivers to install) and selecting the measurements that you want.

You can then create occupational noise reports, calculate a worker's TWA and check whether the hearing protection you have is adequate. All the reports can be saved for later use, printed or even downloaded to your computer for further analysis and reporting using Excel or a similar spreadsheet program.

Manual Download

When connected to the computer's USB port the meter acts like a memory stick, providing the measurements in standard CSV files that can be copied to your hard disk and loaded directly into Excel or similar application.

This demands a little knowledge of the computer and the ability to copy files to different locations, but for anybody wanting the measurements in a spreadsheet it is an excellent and low cost method.

Insight Software

The Insight software is an option that can be purchased with the meter or at a later date. A trial version can also be downloaded - this is a full featured version of the software but time limited to 30-days, after which time you need to buy a license to continue using it.

This software downloads the measurements from the CEL620 series sound level meter, storing them on your computer. You can carry out analysis of the sound levels and produce a number of reports.

The Insight software also works with the CEL630 series sound level meters and the dBadge Noise Dosimeter.


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

Sound Level Meter Standards

  • ANSI S1.4 and ANSI S1.43 Type 1 or Type 2
  • IEC 60651 and IEC 60804 Type 1 or Type 2
  • IEC 61672 Class 1 or Class 2

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 range20 to 140 dB (single range), 143 dB Peak
Noise floor< 33 dB(A) Type 2, < 25 dB(A) Type 1
Display320 x 240 pixel color TFT
Output to PCUSB Mini B
Batteries3 x AA Alkaline, (20 hours with backlight off)
External Power9 to 14V DC at 250mA
Measurements stored100
Dimensions72 x 229 x 31mm, 295g
2.8" x 9.0" x 1.2". 10.4oz
Measured Parameters
Frequency weightingsA, C and Z (simultaneous)
Time weightingsFast, Slow and Impulse
Amplitude weightingsQ3, Q4 and Q5
Thresholds70 to 90 dB (applies to Lavg)
Sound LevelLXY, LXYMax, LXYMin
IntegratedLXeq, Lavg, LAE
Takt MaxLTM3, LTM5, LXIeq

Where X is frequency weighting A, C or Z
and Y is time weighting Fast, Slow or Impulse