Casella CEL-633A1 Sound Level Meter
Casella CEL-633A1 Sound Level Meter
Casella CEL

Casella CEL-633A1 Sound Level Meter

Pine Item #54680

The CEL-63x Series of sound level meters are the most versatile of meters available; ideal for both noise at work applications (ISO9612, OSHA) and environmental measurements (BS4142). Ensure compliance with workplace noise legislation with the CEL-633 and to assist with the selection of hearing protection.

The CEL-633 is an easy to use instrument designed to undertake the measurement requirements of the workplace and environmental noise. It also complies with the latest IEC and ANSI international standards for sound level meters. Just switch on the instrument, auto-calibrate and start measuring with one of the predefined views. Regardless of the view selected, all data is measured and stored simultaneously so no mistakes can be made.

By implementing the latest digital technology, the meter has a single measurement range so no range adjustment is required, ensuring the highest levels of performance with all noise sources. Models are available for both environmental and/or occupational noise with the availability of frequency analysis and advanced functions such as data markers, timers, and logging of time-history data. Even with such advanced functionality, the CEL-630 Series remains very simple to use.

Audio recording is a standard feature of the CEL-633, all models having a voice notes capability. This allows you to speak into the microphone before or after a measurement in order to annotate the result, so you don't need to write things down. Data can also be marked during a measurement to signify either an anomalous or significant event and audio is also recorded for later noise source identification.

If the instrument is used for unattended measurements, audio recording can be triggered by a condition such as a given level being exceeded for a period of time. In this case, additional data will be collected along with the audio. This can be especially useful where the noise source of interest is transient. The Type 1 microphone can be changed out.


2GB memory for more than 1 year of data storage

Simultaneous measurement of all parameters with all frequency and time weightings

Real-time octave and ⅓ octave measurements

Level triggered events for transient measurements

Data markers, back erase function and audio recording

Single measurement range up to 140dB, no range adjustment required

Pre-configured set-ups for occupational and environmental measurements


Workplace noise assessments according to ISO9612, OSHA 29CFR 1910.95

Selection of hearing protection

Calculation of noise exposure

Ensuring compliance with workplace noise legislation

Quantity must be 1 or more
Equipment available for both rental and purchase
Request a Quote


Technical Specifications

Operator controls8 buttons for power On/Off + 2 x context sensitive menu selection + 4 navigation + confirm selection
Tripod socket for fixed measurementsYes via standard camera thread (1/4 size)
Weight including batteries (oz/gm)10.1 oz (< 291g)
Dimensions w x h x d (in/mm)2.8 x 10.5 x 1.2 in (71.5x 267.0x 31.0mm) including preamplifier and microphone
Battery Life (hours)Up to 12 hours without backlight
Batteries3 x AA Alkaline or NiMH rechargeable types
Operating pressure range650 to 1080 mbar (65 to 108 kPa)
Operating Temperature Range14 to 122°F (-10 to 50°C) (Class 1)\n32 to 104°F (0 to 40°C) (Class 2)
Effect of HumidityLess than ±0.5dB over the range 30 to 90% RH (non-condensing) rel. to value at ref. conditions
Reference Conditions68°F (20°C) air temperature\n65% Relative Humidity\n1013 mbar (101.325 kPa) atmospheric pressure
Microphone type½ Free field Electret microphone & preamplifier\nType 1 or Type 2 on a removable CEL-495 preamplifier
AccuracyANSI S1.4 & S1.43 IEC 61672-1 2002-5
Frequency filters comply withANSI S1.11 and IEC 61260
Total measurement range (dB)20 to 140
Dynamic range on single measurement span (dB)120
Input preamplifier/microphoneCEL-495 removable preamp. plus ½ mic. capsule
Noise floor (A weighted dB)< 20 (Class 1) < 25 (Class 2)
Frequency weightingsSimultaneous A C & Z (unweighted)
Time weightingsSimultaneous Slow Fast and Impulse
Amplitude weightings (Exchange rate)Simultaneous Q=3 Q=4 and Q=5 dB
Displayed parameters available as per user selected list or using pre-configured setups (depending on model)Lp Lmx Lmn Lpk\nLeq LIeq LDOD Lavg LAE Ltm3 Ltm5\nLDN LDEN CNEL 5 x LN%
Narrow band real time measurements(B version) 11 octave bands 16 Hz to 16 kHz\n(C version) 33 third octave bands 12.5 Hz to 20 kHz with cursor readout plus A & C & Z broad ban
Display of octave and third octave band levelsGraphical spectrum including broad band values\nWith listing of individual band levels in tabular format
Measurements in octave (& 1/3) band mode includeLmx and Leq with selected freq and time weightings
Display type240 x 320 full color dot matrix LCD digital including real-time analog bar graph scale
Data storage for time history logging periods and profiles (depending on model) 1 Gb internal memory999 run maximum memory long term recording is separated into “24 hr days” that can be recombined in Insight software for later analysis and
Timed interval for regular data storage -632 & 633 models1 sec to 1 hour in 13 fixed intervals for Periods\n1 sec to 30 mins for Profiles
Event capture above user selectable level with audio recording in wav format for identificationUser selectable trigger level 40 140 db in 1 dB steps\nWav file stored at hi med or lo resolution
Displayed time span for time history graph on LCDLast 60 seconds
Signal detected when calibrator placed over microphone at 1 kHz frequencyCalibration level set to 114.0 or 94.0 dB\nWith +/-1 dB span and 0.1 dB resolution by user
External power option (12 Vdc) or via USB 5V lineYes via universal CEL-PC18 unit
Analog outputsAC (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.\nMinimum load impedance 22k.
DC output characteristics0 to 1.3V DC for FSD on selected range.
Digital output of stored result setsVia USB 2.0 mini B connector to Casella Insight program
Manuals, Data Sheets & Software