Casella CEL CEL-181 User Manual
Page 2
Casella USA
17 Old Nashua Road #15
Amherst, NH 03031-2839
www.casellausa.com
Page 2 of 14
tel:
(
800) 366-2966
27 Jan 2006
fax: (603) 672-8053
CONTENTS
Introduction
2
1 The Risk of Industrial Deafness
3
2 Technical Description
5
3 Operating the Instruments
6
3.1 Dosimeter Calibrator Type CEL-182
6
3.2 Noise Dose Meter CEL-180/181
6
3.2.1
Schedule of Parts
6
3.2.2
Controls and Indicators
7
3.2.3
Connection of the Batteries
8
3.2.4
Calibration Checks
8
4 Measurement Methods
9
5 Analysis of Results
11
6 Care and Maintenance Procedures
11
7 Manufacturer's Warranty and Service Arrangements
12
8 Specification
13
9 Calibration Certificate
14
10 Modifications and Post Production Developments
14
Introduction
These are personal integrating noise dose
meters that have been specifically developed for
the accurate and reliable assessment of the
degree of auditory hazard associated with any
given job function. The design concept allows
for a wide degree of flexibility in determining the
integration law and, hence, they can be preset
to conform to any of the damage risk criteria that
are currently in use. This is achieved by using a
wide range RMS detector followed by an
amplitude-weighting network and in both of
these circuits the main parameters may be
manufacturer preset. Particular attention has
been paid in the design to minimizing the
instrument's weight and physical dimensions in
order that it will be socially acceptable to the
subject and cause minimum interference with
the normal working routine. Special procedures
are employed to ensure the security of the
results, thereby preventing unauthorized access
to the accumulated data.
When worn by the subject the dose meter will
monitor the actual noise level to which he has
been exposed and calculate the percentage of
permitted exposure consumed in accordance
with the procedures laid down in the various
National Standards and Government control
orders that apply in each individual country.
When calibrated with a 5dB exchange rate (q =
5) the instruments comply to the OSHA
regulations published in the United States and
with q = 3 they comply with the International
Standard ISO R1999. Furthermore, the impulse
time constant may be, employed as required by
certain West German regulations. Each of these
calibration settings is clearly explained in this
manual and each instruments' calibration is
indicated by a letter code on the serial number
plate. An additional measurement range is
included in the CEL personal dose meter
enabling its range of applications to be extended
to cover measurements in both work areas
having lower noise levels and to undertake
certain environmental noise measurements.
Full details regarding the theory and practice of
industrial noise dose measurements are given in
the latter sections of this manual.