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Casella Wide Range Integrating Sound Level Meter Type 2 with Standard Accessories

Item #:
CEL-621-A2
Brand:
Casella
Casella Wide Range Integrating Sound Level Meter Type 2 with Standard Accessories
$1,795.00
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Discontinued

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Casella Wide Range Integrating Sound Level Meter Type 2 with Standard Accessories

Casella Wide Range Integrating Sound Level Meter Type 2 with Standard Accessories

$1,795.00

Discontinued


CEL-621-A2 Wide Range Integrating Sound Level Meter Type 2 with Standard Accessories by Casella

Many environmental noise measurements require a complete knowledge of the variable noise level climate over a representative period of time. The CEL-621 meter is designed to satisfy this need as a short term measurement instrument. It can measure the popular max, min, peak and time average levels plus up to 5 statistical or percentile results for the overall run.

The wide 120 dB dynamic range means that the user does not need to worry about changing the input range settings as it will always be on the right range. The provision of the three popular frequency weightings and the three time weightings enable many different measurements to be taken by new and experienced users alike to correctly characterize the noise.

Key Benefits

  • Wide dynamic range from 20 to 140 dB on single span
  • A, C and Z simultaneous frequency weightings
  • Slow, Fast and Impulse rms. time responses
  • Large 240 x 320 pixel color ¼ VGA graphic display
  • Easy to use menu structure
  • Integrating capability for time average values plus peak
  • Available with 5 statistical LN% values measured for broadband levels
  • Available in ANSI/IEC class 1 and class 2 accuracy
  • Available as broad band, octave or third octave band models
  • Storage of all results simultaneously in a huge non-volatile memory
  • Available as complete measurement kits with acoustic calibrator and case

Applications

For measurements of simple noise levels the instantaneous sound pressure level is often adequate. However, in many outdoor situations the noise levels are too variable or change too quickly to estimate the average level or exceedance levels correctly. The CEL-621 is designed to assist in the correct description of these difficult noise situations by providing the time average noise level with the 3, 4 and 5 dB exchange rates. Changing noise levels are properly integrating into the overall time average answer and displayed as the Leq (with Q=3). 5 LN% values (10%, 50%, 90%, 95% and 99%) are calculated and stored from the instantaneous sound levels. This enables the CEL-621 to correctly assess changing noise levels and provide the appropriate result for many short term community noise level surveys. Additional octave (1/3 oct) band filters in the B or C version of the CEL-621 provide for a comprehensive frequency analysis of tonal noise levels for noise control applications.
Technical Specification - General
Accuracy ANSI S1.4 & S1.43, IEC 61672-1 2002-5
Frequency filters comply with ANSI S1.11 and IEC 61260
Microphone type Removable ½” Free field Electret microphone on fixed preamplifier
Reference Conditions 68°F (20°C) air temperature
65% Relative Humidity
1013 mbar (101.325 kPa) atmospheric pressure
Operating Temperature Range 14 to 122°F (-10 to 50°C) (Class 1)
32 to 104°F (0 to 40°C) (Class 2)
Effect of Humidity Less than ±0.5dB over the range 30 to 90% RH (non-condensing), rel. to value at ref. conditions
Operating pressure range 650 to 1080 mbar (65 to 108 kPa)
Batteries 3 x AA Alkaline or rechargeable types
Battery Life (hours) Up to 12 hours without backlight
Dimensions w x h x d (in/mm) 2.8 x 9.0 x 1.2 in (71.5x 230.0x 31.0mm) including preamplifier and microphone
Weight including batteries (oz/gm) 10.1 oz (< 291g)
Tripod socket for fixed measurements Yes via standard camera thread (1/4” size)
Operator controls buttons for power On/Off and 2 x context sensitive menu selection + 4 navigation and confirm buttons
Technical Specification – Performance
Total measurement range (dB) 20 to 140
Dynamic range on single measurement span (dB) 120
Noise floor (A weighted dB) < 25 (Class 1)
< 30 (Class 2)
Frequency weightings A, C & Z (unweighted)
Time weightings Slow, Fast and Impulse
Displayed parameters available as per user selected list or using pre-configured setups Instantaneous level – Lp, peak level Lpk
Maximum level Lmx, Minimum level – Lmn
Average levels Leq, LDOD, Lavg, LAE, Ltm3, Ltm5
Percentile levels 5 x LN% values for broadband results
Octave/third octave band measurements Complete spectrum plus A & C & Z broad band levels
Frequency analysis measurements – Octave & Third Octave as options in B and C version meters 11 octave bands 16 Hz to 16 kHz
33 third octave bands from 12.5 Hz to 20 kHz
Measurements made in oct (1/3 oct) band mode include Lmx and Leq with selected freq and time weightings
Reset of max/min/average level from key press by user Yes – with non-decaying max/min hold
Duration timer for run Yes – from 00:00:01 to 24:00:00 to 1 sec resolution
Display type 240 x 320 full color dot matrix LCD digital including real-time analog bar graph scale
Display resolution – numeric (dB) 0.1
Display resolution – graphical (dB) 1
Update rate for display (seconds) 0.5
Displayed time span for time history chart (minutes) Last 60 seconds
Calibration method Automatically recognized by meter
Signal detected when calibrator placed over microphone at 1 kHz frequency Calibration level set to 114.0 or 94.0 dB by user
With +/-1 dB span and 0.1 dB resolution
External power option (12 Vdc) Yes via universal CEL-PC18 unit
Analog outputs AC (and optional DC) via 2.5 mm jack socket
AC output characteristics - (Provided for DAT tape / PC wav file recording or headphone applications) Approx 0.85V RMS FSD output on selected sound level measurement range.
Minimum load impedance 22k.
DC output characteristics - (Provided at time of order as option for connection to chart recorder or pc data logging system) 0 to 1.3V DC for FSD on selected range.
Output corresponds to selected frequency and time weighting. 2k Output impedance
Digital output of stored result sets USB 2.0 format of memory results as .CSV text file via ‘mini B’ USB (meter acts as memory card)

Datasheets & User Manuals

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