Casella’s CEL-240 series of general purpose digital sound level meters combine DSP, simplicity, and affordability. Monitoring range of 30–130 dB. Suitable for simple noise measurement tasks and everyday noise applications.
Casella CEL’s CEL-240 series of general purpose digital sound level meters combine the power of Digital Signal Processing (DSP) with the affordability and simplicity of traditional analog sound monitoring instruments. The CEL-240 series includes two primarily instrument types, the CEL-240 and CEL-242 basic sound meters, and the CEL-244 and CEL-246 integrating meters. The CEL-242/246 feature basic datalogging capabilities. CEL-240 sound level meters are suitable for a range of simple noise measurement applications, are ideal for industrial hygiene measurement of workplace noise, and comply with ANSI and IEC Type 2 accuracy specifications.
All CEL-240 series sound level meters support two measurement ranges and can display maximum and instantaneous values. In addition, the CEL-244/246 support the time average values Leq or Lavg. The CEL-240 supports impulse, fast, and slow time weightings on A or C scale. Other CEL-240 features include a wide sound monitoring range from 30–130 dB, a monochrome LCD screen, scrolling sound level display, and auto-calibration at either 114 or 94 1 kHz decibel levels.
Digital output of audio is possible through USB and the CEL-240 can also provide an audio feed to a computer or external recorder through a 2.5 mm audio jack. Standard measurement and optional computer output kits are available. CEL-240 series instruments are powered by three AA alkaline batteries for up to 35 hours of use and can also be powered continuously through a computer or a mains-to-USB adapter.
Differences between the CEL-240, CEL-242, CEL-244, and CEL-246.
| Features available on meter | CEL-240 | CEL-242 | CEL-244 | CEL-246 |
|---|---|---|---|---|
| Accuracy to ANSI S1.4 and IEC 61672 type 2 | • | • | • | • |
| Accuracy to ANSI S1.43 and IEC 61672 type 2 | • | • | ||
| Basic sound level measurements | • | • | • | • |
| A or C frequency weighting | • | • | • | • |
| Slow, Fast or Impulse time response | • | • | • | • |
| Instantaneous sound level value displayed Lp | • | • | • | • |
| Maximum value displayed Lm• | • | • | • | • |
| Time history trend graphically displayed on screen | • | • | • | • |
| Q=3 or 5 dB exchange rate available | • | • | ||
| Time average level calculated Leq or Lavg | • | • | ||
| Sound level samples output to external computer | • | • | • | • |
| Basic data logging to internal memory | • | • |
Note that all CEL-24X models have real time output of sould levels via USB to a pc running db24 software. The CEL-242 and 246 models have non-volatile on board storage memory for up to 99 runs
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