Products > Sound Level Meters > CEL240

CEL240 Type 2 Sound Level Meter

CEL240 Sound Level Meter
CEL240 Sound Level Meter

Price List

Type 2 Sound Level Meter
Lead time 2 weeks

Sound Level Meter with Calibrator and Case
Lead time 2 weeks

Type 2 Sound Level Calibrator
In stock

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 Sound Level Meter
2 weeks

Sound Level Meter with Calibrator and Case
2 weeks


  • Quick and easy to use
  • Lightweight but rugged case
  • 2 year warranty
  • Calibration certificate included


  • General noise measurements
  • OSHA occupational noise surveys


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

It is essential that a sound level meter meets these standards if it is to be used for any important measurements, particularly those that involve the protection of workers (hearing protection) or any other legal purposes. The CEL240 meets the strict demands of ANSI S1.4, IEC 60651 and IEC 61672 and is provided with a Calibration Certificate at no extra cost, so you can make your noise measurements with confidence.

Digital Technology and Graphical 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).

Unlike most sound level meters in this price range, the CEL240 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.


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 tab for more details about the standards and noise measurement range.

CEL240 Applications

The CEL240 Sound Level Meter is ideal for noise measurement applications that do not need automatic averaging (Lavg or Leq) or data logging. Here are some typical applications for this meter. If you are unsure then please drop us an email, we are happy to advise.

Occupational Noise - Noise in the Workplace

In the USA most companies follow the OHSA regulations, which demand the measurement of "Slow" Sound Level with "A" frequency weighting. The CEL240 provides these measurements, making it ideal for simple OSHA noise surveys.

Outside the USA many regulations demand the use of an integrating sound level meter. Even within the USA an integrating meter is advisable if the noise levels are not stable, as it will average out the variations in level, which is more reliable than averaging it by eye. Please see the Occupational Noise page for more information.

Fire Alarm Testing

The standards for fire alarm testing usually demand the measurement of the "A" weighted "Fast" sound level. The CEL240 sound level meter provides this measurement.

System Integration

Although not a data logging meter, the CEL240 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

This meter meets the strict requirements of the international standards to Type 2 or Class 2. This may be adequate for environmental work, but often these measurement standards and the authorities involved will expect the use of a Type 1 or Class 1 (more accurate) integrating meter. Environmental monitoring usually requires automatic, repeating measurements of, for example, 15 minutes or 1 hour. Data logging is really a necessity.

For suitable environmental noise monitoring solutions please visit our Environmental Noise Page.

Using It

The CEL240 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.

1. 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 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.

3. Changing Settings

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

Display TypeGraph or numbers
Measurement Range30 to 100 dB or 60 to 130 dB
Time WeightingFast, Slow or Impulse
Frequency WeightingA or C weighting

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.

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


The CEL240 is a "general purpose" sound level meter and meets the international standards to Type 2 or Class 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

  • ANSI S1.4 Type 2
  • IEC 60651 Type 2
  • IEC 61672 Class 2

Technical Specification

Measurement ranges30 to 100 and 60 to 130 dB
Noise floor< 33dB(A)
Time weightingsFast, Slow, Impulse
Freq. weightingsA and C
Battery power3 x AA Alkaline for >35 hours operation
External power5V via USB Mini B socket
Dimensions72 x 212 x 31mm, 245g
Tripod mount1/4" socket
AC output0.85V RMS @ FSD "A" weighted
DC output0 to 3.3V DC for FSD on selected range (FOC option)
Operating conditionsRH: 5 to 90% (non condensing)
Temperature: 0 to 40°C
Atmos. pressure 65 to 108kPa