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CASELLA USA
CEL-240 DIGITAL SOUND LEVEL METER
FREQUENTLY ASKED QUESTIONS
FAQ's: COMPARISON OF MODELS
What models are there in the range?
A single model variant is available – the CEL-240. It is a completely new design compared to the
earlier CEL-231 & 254 models in the original 200 series.
What are the main features & benefits of the CEL-240?
The main differences between the CEL-240 and the earlier 231/254 instruments are the use of digital
signal processing (DSP) technology and a low power consumption microprocessor that is unique in
such a low cost instrument. The meter features the instantaneous sound level plus the maximum
hold feature on all screens plus a real time bar graph display. This makes the CEL-240 model
extremely useful in circumstances where the noise levels are fluctuating and where the time history
trending graph will be useful for seeing changing noise levels of short events. A simple digital output
is also available to link to a personal computer for basic data logging applications.
FAQ's: OPERATION
How long will standard alkaline batteries last in a CEL-240?
A set of 3 x AA alkaline cells can power a CEL-240 for more than 35 hour's continuous operation at
normal room temperature. Lower temperatures will reduce useful battery life. Good quality alkaline
batteries are recommended for longest running time.
Can rechargeable batteries be used in a CEL-240?
A set of 3 x AA NiMH rechargeable batteries can be used instead of alkaline batteries and battery life
will be around the same time at normal room temperature. The rechargeable batteries will operate
successfully down to lower temperatures than an alkaline battery set. NiMH batteries must be
recharged outside the CEL-240 and can be used repeatedly in these instruments. When NiMH
batteries are run down they can be recharged in a few hours and used again up to the number of
recharge cycles recommended by the battery manufacturer. Typically this will be around 300 – 500
charge cycles.
How can the instrument be powered from an external source?
The CEL-240 is designed to be powered from an external supply via the USB connector that is
available on the bottom of the meter. This takes the usual 5Vdc supply from the USB port of a laptop
or desktop computer via a suitable cable.
Can the microphone of a CEL-240 be removed?
The microphone unit of a CEL-240 is not removable therefore remote operation is not normally
possible. In special circumstances it may be possible to fit a length of plastic tubing of ¼" internal
diameter over the end of the microphone in order to place the open end near to a machine noise
source that would be dangerous to approach so closely.
Can the CEL-240 be used for outdoor measurements?
The CEL-240 is not designed for extended use outdoors since it is not completely sealed against the
likely wind and rain that would spoil such measurements.
Casella USA
Page 3 of 6
(800) 366-2966
31 Jan 2008
Info@CasellaUSA.com
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