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The CEL633B Sound Level Meter is for environmental noise measurement. This model has Octave Band filters, making it suitable for other specialist applications too.
The CEL633B sound level meter is available as Type 2 (CEL633B2), but most environmental noise monitoring applications demand the more accurate Type 1 (CEL633B1) specification. This meter also has everything needed for occupational noise measurement in line with the OSHA, MSHA, ACGIH and EU regulations, making it ideal for anybody involved in both environmental (outside the factory) and occupational (inside the factory) noise.
If the meter is to be left unattended in poor weather conditions then the Outdoor Kit should be used to offer protection against the elements. The Outdoor Kit also includes a rechargeable battery pack for longer term monitoring.
The meter is fitted with real-time Octave Band Filter, which are sometimes needed for noise sources that may be tonal or for assessing hearing protector performance. As well as measuring the Leq and Lmax in each band, the CEL633B meter also measures the statistical parameters, Ln, in each of the Octave bands.
The CEL633 has a very wide span, covering 20 to 140dB in a single range. This is particularly important when monitoring in an environment with generally low noise levels and occasionally high ones - for example when cars pass. The most useful parameter when measuring environmental and community noise is the Leq, the average sound level. The meter measures the periodic Leq and also includes five Ln values for statistical analysis of the noise.
The CEL633B comes complete with data logging capability with measurements stored in the meter's large internal memory.
When connected to a Windows computer using the free CasellaDrive software, the meter acts like a memory stick (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 special software.
Due to the large amount of data and the potential complexity of the measurements, we would recommend the use of the Insight software. It simplifies the process of downloading the measurements and stores them in a database, managed by person, place or process criteria. To get the Insight software for the CEL633 include item ISC020 with your order.
The CEL633B is a Sound Level Meter that includes the usual environmental noise measurement parameters along with real-time octave band filters for tonal noise assessments and hearing protector analysis.
Due to the nature of environmental noise surveys (both the acoustic nature and the political nature) we recommend the use of a Type 1 sound level meter.
This version of the CEL630 series of meters includes all the Environmental noise parameters along with a detailed time history store and automatic timers, making it ideal for both short term and longer term assessments.
As most occupational noise regulations accept Type 2 as being adequate, all versions of the CEL633 are suitable. If you need to measure both environmental and occupational noise then this meter will do both.
The CEL633B sound level meter measures the noise parameters that are needed by most regulations:
Unattended noise measurement is convenient but causes problems when the time comes to identify the source of the noise. Was it a car, a strong gust of wind blowing the leaves or somebody shouting. The CEL633B can record the audio so that you can listen to the interesting bits, enabling you to make a positive identification of the noise source.
The addition of a detailed time history store allows for post processing and graphing the noise levels down to a resolution of 1 second, and the automatic timers make it easy to run repeating measurements (for example repeating 5 minute measurements in addition to the 1 second Time History).
The sound level meter can by mounted on a standard camera tripod, but if it is to be left unattended in poor weather conditions you will also need the weather protection offered by the Outdoor Kit.
The CEL633B is also suitable for the measurement of noise in the workplace:
The CEL633B is an Environmental sound level meter, suitable for applications that demand an accurate meter of the correct grade along with detailed measurement storage with Time History and automatic measurement timers.
This meter can be used without a computer, reading the measurements from the screen, but really benefits from having the Insight software to download the detailed time history measurements.
As this meter measures all parameters at the same time there is no need to select what you need beforehand. Just make the measurement and everything is there.
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.
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 being LAeq, Lmax and Ln (L10, L90, etc). It also stores the time history of the noise, which provides a graph of the sound level over time.
When you are happy that you have measured for long enough simply press the Stop key.
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 and the border is green.
For many environmental noise surveys, you need periodic (usually 5 minute, 15 minute or 1 hour) measurements showing values such as the Leq and the L90.
To make this type of measurement, set the meter to make repeating measurements of the required duration. The meter will now run for the specified period. It will then stop, store the results and start again automatically. Advanced timers even allow different measurement times for different days.
It is better to mount the meter on a tripod for this type of measurement. A tripod mount is included on the back of the meter. It can be fitted to a standard camera tripod, or we can provide you with a suitable one.
The CEL633B comes complete with a number of noise measurement stores:
All these measurement stores are included with the CEL633B sound level meter, even if you choose not to buy the additional software. There is more information below about the different download options.
The more advanced Insight software can be downloaded free of charge for 30 days in case you are not sure whether you need the extra reporting features that it offers.
When the CEL633B is connected to a computer it works like a memory stick, so there are no complicated driver installations. However, the files are coded and compressed so you won't be able to read them directly.
The CasellaDrive software decodes the files and makes them available to copy into Excel or any similar spreadsheet program.
Most files are simple Comma Separated Text (CSV) files that can be read into many different programs. Audio recordings are in the standard WAV format, to be listened to using standard media playing applications.
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 sound level meter, storing them on your computer. You can carry out analysis of the sound levels and produce a number of reports.
The CEL633B data logging Integrating Sound Level Meter is available as either Type 1 (CEL633B1) or Type 2 (CEL633B2) as defined by the international sound level meter standards.
|Frequency weightings||A, C and Z (simultaneous)|
|Time weightings||Fast, Slow and Impulse|
|Amplitude weightings||Q3, Q4 and Q5|
|Thresholds||70 to 90 dB (applies to Lavg)|
|Sound Level||LXY, LXYMax, LXYMin, LC-LA|
|Integrated||LXeq, Lavg, LAE|
|Takt Max||LTM3, LTM5, LXIeq|
|Statistical||5 x Ln values|
|Time History Level 1||Periods of 1 minute to 1 hour|
|Time History Level 2||Periods of 1 second to 30 mins|
|Octave Band Params||LXY, LXYMax, LXeq|
|Octave 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
Using a meter that meets these standards is essential for repeatable results and especially for any measurements that will be used for legal purposes.
|Measurement range||20 to 140 dB (single range), 143 dB Peak|
|Display||320 x 240 pixel color TFT|
|Output to PC||USB Mini B|
|Batteries||3 x AA Alkaline|
|(15 hours with backlight off)|
|External Power||9 to 14V DC at 250mA|
|Dimensions||72 x 229 x 31mm, 295g|
|2.8" x 9.0" x 1.2". 10.4oz|
|>1 year when logging set to 1 second|
|Timers||Duration 1s to 24h|
|On/Off Timers: 6 sets with selectable times and repeat function.|
|Audio Recording||8kHz sampling, 60 hours recording|
|24kHz sampling, 10 hours recording|