Casella CEL-633A1 Sound Level Meter
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.
Features:
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
Applications:
Workplace noise assessments according to ISO9612, OSHA 29CFR 1910.95
Selection of hearing protection
Calculation of noise exposure
Ensuring compliance with workplace noise legislation
| Operator controls | 8 buttons for power On/Off + 2 x context sensitive menu selection + 4 navigation + confirm selection |
| Tripod socket for fixed measurements | Yes 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 |
| Batteries | 3 x AA Alkaline or NiMH rechargeable types |
| Operating pressure range | 650 to 1080 mbar (65 to 108 kPa) |
| Operating Temperature Range | 14 to 122°F (-10 to 50°C) (Class 1)\n32 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 |
| Reference Conditions | 68°F (20°C) air temperature\n65% Relative Humidity\n1013 mbar (101.325 kPa) atmospheric pressure |
| Microphone type | ½ Free field Electret microphone & preamplifier\nType 1 or Type 2 on a removable CEL-495 preamplifier |
| Accuracy | ANSI S1.4 & S1.43 IEC 61672-1 2002-5 |
| Frequency filters comply with | ANSI S1.11 and IEC 61260 |
| Total measurement range (dB) | 20 to 140 |
| Dynamic range on single measurement span (dB) | 120 |
| Input preamplifier/microphone | CEL-495 removable preamp. plus ½ mic. capsule |
| Noise floor (A weighted dB) | < 20 (Class 1) < 25 (Class 2) |
| Frequency weightings | Simultaneous A C & Z (unweighted) |
| Time weightings | Simultaneous 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 levels | Graphical spectrum including broad band values\nWith listing of individual band levels in tabular format |
| Measurements in octave (& 1/3) band mode include | Lmx and Leq with selected freq and time weightings |
| Display type | 240 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 memory | 999 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 models | 1 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 identification | User 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 LCD | Last 60 seconds |
| Signal detected when calibrator placed over microphone at 1 kHz frequency | Calibration 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 line | 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.\nMinimum load impedance 22k. |
| DC output characteristics | 0 to 1.3V DC for FSD on selected range. |
| Digital output of stored result sets | Via USB 2.0 mini B connector to Casella Insight program |