CEL-631 Environmental Integrating Real Time Noise Analyzer

CEL-631 Environmental Integrating Real Time Noise Analyzer
Key benefits
While many industrial hygiene
professionals are interested in
noise measurements inside the
workplace there is also an
increasing demand to measure
environmental noise outdoors as
well. The CEL-631 environmental
designed to satisfy this need by
providing overall data storage of
varying noise levels during the
day. The comparison of the
different LN% values is useful in
describing the variability of the
noise over time. A super wide
120 dB dynamic range means
that the user does not need to
worry about selecting scales as
the meter will always be on the
right range. The provision of all
the popular frequency & time
weightings and exchange rates
allow many different noise
measurements to be taken by
new and experienced users alike.
The CEL-631 has a full-color,
graphic LCD for complete clarity.
CEL-631.C Real time third
octave band environmental
noise analyzer
Wide dynamic range from 20
to 140 dB on single span
A, C and Z simultaneous
frequency weightings
Slow, Fast and Impulse rms.
simultaneous time responses
Q=3, Q=4 and Q=5 simultaneous exchange rates
Large 240 x 320 pixel color
¼ VGA graphic display
Easy to use menu structure
Storage of complete overall
run results inc. 5 x LN%
Manual or fixed duration
recording possible
Available in ANSI/IEC class 1
and class 2 accuracy
Available as B or C version
with real time octave & 1/3
octave band
simultaneously in a huge
non-volatile memory
Up to 999 runs stored
acoustic calibrator and case
For measurements of many
industrial noise levels the time
average sound pressure level is
often adequate. However, in
many situations noise levels are
variable or changing too quickly
to accurately estimate the
representative time period. The
CEL-631 is designed to assist in
the correct interpretation of these
non-steady noise climates by
including the percentile noise
levels that have occurred during
the run. The changing noise
levels are sampled and the
various percentile values such as
the LN10%, LN50% and LN90%
are calculated. This enables the
CEL-631 to correctly record the
key maximum, minimum, time
average and 5 x percentile noise
levels for comparison with
national or international limits.
Additionally, octave and third
octave band filters in the B and C
versions of the CEL-631 provide
real time frequency analysis of
tonal noise levels that are
prescription of hearing protectors
or noise reduction applications
such as barriers or earth bunds.
Ordering information
General purpose analyzers
Precision sound meters
Environmental Type 2 sound level meter with wrist strap and windscreen
Type 2 Sound level meter kit with calibrator, USB cable, software and case
Env. Type 2 octave band analyzer & wrist strap and windscreen
Type 2 octave band analyzer kit with calibrator, USB cable, s’ware and case
Env. Type 2 1/3 oct. band analyzer & wrist strap and windscreen
Type 2 1/3 oct. band analyzer kit with calibrator, USB cable, s’ware & case
Type 1 versions of all the above meters are available by specifying the part
number as CEL-631.B1/K1 for example
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Technical Specification - General
Frequency filters comply with:
ANSI S1.4 & S1.43, IEC 61672-1 2002-5
ANSI S1.11 and IEC 61260
½” Free field Electret microphone & preamplifier
Type 1 or Type 2 on a removable CEL-495 preamplifier
68°F (20°C) air temperature,
65% Relative Humidity,
1013 mbar (101.325 kPa) atmospheric pressure.
14 to 122°F (-10 to 50°C) (Class 1)
32 to 104°F (0 to 40°C) (Class 2)
Less than ±0.5dB over the range 31 to 90% RH
(non-condensing), rel. to value at ref. conditions
650 to 1080 mbar (65 to 108 kPa)
3 x AA Alkaline or NiMH rechargeable types
Up to 12 hours without backlight
2.8 x 10.5 x 1.2 in (71.5x 267.0x 31.0mm)
including preamplifier and microphone
10.1 oz (< 291g)
Yes via standard camera thread (1/4” size)
8 buttons for power On/Off + 2 x context sensitive
menu selection + 4 navigation + confirm selection
Microphone type:
Reference Conditions:
Operating Temperature Range:
Effect of Humidity:
Operating pressure range:
Battery Life: (hours)
Dimensions w x h x d: (in/mm)
Weight including batteries: (oz/gm)
Tripod socket for fixed measurements
Operator controls:
Technical Specification – Performance
Total measurement range (dB)
Dynamic range on single measurement span (dB)
Noise floor (A weighted dB)
Frequency weightings
Time weightings
Amplitude weightings (Exchange rate)
Displayed parameters available as per user selected list
or using pre-configured setups
Narrow band real time measurements
Display of octave and third octave band levels
Measurements made in octave (& 1/3) band mode include
Display type
Data storage 1 Gb internal memory
Direct printing of results on site
Displayed time span for time history graph on LCD
Signal detected when calibrator placed over microphone
at 1 kHz frequency
External power option (12 Vdc) or via USB 5V line
Analog outputs
AC output characteristics (Provided for DAT tape / PC wav file recording or
headphone applications)
DC output characteristics (Provided at time of order as option for connection to chart
recorder or pc data logging system)
Digital output of stored result sets
Audio recording
20 to 140
< 20 (Class 1), < 25 (Class 2)
Simultaneous A, C & Z (unweighted)
Simultaneous Slow, Fast and Impulse
Simultaneous Q=3, Q=4 and Q=5 dB
Lp, Lmx, Lmn, Lpk
Leq, LIeq, LDOD, Lavg, LAE, Ltm3, Ltm5
4 fixed LN% values plus 1 user selectable % value
(B version) 11 octave bands 16 Hz to 16 kHz
(C version) 33 third octave bands 12.5 Hz to 20 kHz
with cursor readout plus A & C & Z broad band levels
Graphical spectrum including broad band values &
With listing of individual band levels in tabular format
Lmx and Leq with selected freq and time weightings
Plus 5 LN% spectra
240 x 320 full color dot matrix LCD digital
including real-time analog bar graph scale
999 run maximum memory storing all parameters over
the whole of the run – overall results are recorded
To portable battery operated printer on 3 in paper roll
Last 60 seconds
Calibration level set to 114.0 or 94.0 dB
With +/-1 dB span and 0.1 dB resolution by user
Yes via universal CEL-PC18 unit
AC (and optional DC) via 2.5 mm jack socket
Approx 0.85V RMS FSD output on selected
sound level measurement range.
Minimum load impedance 22k.
0 to 1.3V DC for FSD on selected range.
Output corresponds to selected frequency and time
weighting. 2k Output impedance
Via USB 2.0 mini B connector to Casella Insight program
Voice notes can be stored at the start of a run in wav file
format for later identification and annotation
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