Casella CEL CEL-424 - Manual (Page 2)

3. Introduction to the Dosimeters
The CEL-420 and CEL-460 Noise Dosimeters measure the frequency
weighted noise exposures and peak sound levels simultaneously. The do-
simeter microphone and lead on both models can be replaced by a
sound level meter microphone to offer comprehensive sound level meas-
urement. The dosimeters have the following features.
¤ Four built-in standard dose measurement setups:
OSHA, DOD, ISO85* and ISO90*,
¤ Up to three user specified dose measurement setups,
¤ A single sound level meter setup,
¤ Sixteen dose result stores,
¤ User selection of up to two profiles attached to each
CEL-460 dose measurement,
¤ Self configured storage.
The instruments are built to withstand rough industrial conditions with
cases formed from a polyester/polycarbonate material that gives them a
high resistance to damage. Data integrity is further protected by a dose
microphone lead which is designed to resist knocks and abrasions with-
out affecting the signal passing from microphone to instrument.
Both instruments can be operated and deliver dose and SLM
results without the need for other equipment, beyond an acoustic calibra-
tor. However, they become even more versatile when their measure-
ment and setup data is downloaded to a PC using the CEL-6702 dB10 or
CEL-6704 dB12 Windows™ based software.
These programs have the facilities expected of fully featured Win-
dows™ packages offering post processing, cut and paste between appli-
cations and comprehensive word processing capabilities. In addition,
dB12 has extensive on screen graphing facilities.
3.1 Sound Level Meter and Intrinsically Safe Models
Both dosimeters can be converted to a miniature sound level meter by fit-
ting a CEL-425 SLM Microphone
Adaptor. The CEL-420 then becomes
a CEL-424 SLM, while the CEL-460
becomes a CEL-464. For sound level
meter operation refer to Chapter 8.
Intrinsically safe versions are
available of both dosimeter and sound
level meter versions, with the full
model line up shown in Table 1.
Note*: ISO procedures using Criterion 85 dB and 90 dB.
Table 1: Models Available
Standard
Model
IS Model Description
CEL-420 CEL-422 Noise Dosimeter
CEL-424 CEL-426 Sound Level
Meter
CEL-460 CEL-462 Noise Dosimeter
CEL-464 CEL-466 Sound Level
Meter
Page 54 - CEL-420/460 Getting Started