CEL - 63X


Class 1 Microphone Class 2 Microphone

Broadband CEL - 633A1 CEL - 633A2

Octave Band CEL - 633B1 CEL - 633B2

Third-Octave Band CEL - 633C1 CEL - 633C2

Product Overview

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. For environmental noise monitoring, the CEL-633 can be used for boundary noise assessment, noise nuisance complaints or in the construction industry, section 61 notices.

  • Ideal for Noise at work and environmental applications<

  • Simple operation

  • Logging of time history

  • Audio recording and voice notes

  • Broadband Class 2 mode

Technical specifications

Standards: IEC61672: 2002 Class 1 and 2, ANSI S1.4: Type 1 and 2 (1983)

Filters: IEC61260: Class 0, ANSI S1.43: (1996)

Note: IEC61672 replaces 2 obsolete standards, IEC60651 and IEC60804


Measurement range: 20-140dB RMS (143.3dB peak)

Total Noise floor: 19dB(A) Class 1, 25dB(A) Class 2

Time weightings: Fast, Slow and Impulse simultaneously

Frequency weightings: A, C and Z (un-weighted) simultaneously

Frequency bands:

11 Octave bands 16Hz-16kHz (B&C models)

33 Octave bands 12.5Hz-20kHz (C models)

Amplitude weighting (Q): 3, 4 and 5 simultaneously

Back erase: Last 10s in cumulative mode (all models)

Timers: Duration 1s-24h,

On/Off timers: 6 sets with selectable times and a repeat function


Tripod mount: ¼" Whitworth socket

Batteries: 3x AA Alkaline, 10-15 hours dependent on back light

External power: 9-14V DC at 150mA

Weight: 332g including batteries

Size: 230x72x31mm including preamp and microphone

Measured Parameters

Broadband: LXY, LXYmax, LXYmin, LXeq, LXpeak, Lavg, LC-LA, LXIeq, LTM3, LTM5, LAE. Workplace dose values are calculated within insight software.

Octaves and ⅓ octaves: LXY, LXeq, LXYmax, 5x Ln% (on CEL-633). Where X is the frequency weighting A, C or Z and Y represents time weighting Fast (F), Slow (S) or Impulse (I). All weightings simultaneously measured where appropriate

CEL-633 model additionally stores 5x Ln values in broadband and octave modes. For time history data, all parameters are logged for period times plus 6 selectable profile parameters (plus 5x Ln values on CEL-633). Memory Memory: 2GB (>1 year logging when set to 1 second interval, 999 runs). All parameters stored and accessible via Casella insight. Total measurement runs: 999. Events: 999 events/run. 10 hours of audio recording in high quality mode, 60 hours in low quality mode. For long term unattended monitoring the CEL-630 takes a new run daily for up to a total of 400 days

Audio Recording

Low Quality: 8,000 samples/s @ 8bit (64kb/s), up to 4kHz

High Quality: 24,000 samples/s @ 8 bit (192kb/s), up to 12kHz


Operating 0 to 90%RH in the absence of condensation

Conditions: Temperature of -10 to +50°C (Class 1) and 0 to 40°C (Class 2)

Atmospheric pressure of 65 to 108kPa


User interface can be changed via the menu. English, French, German, Spanish, Italian, Portuguese, Chinese

Add Ons

Sound Level Meter Kit

Includes Instrument, Class 1/2 Acoustic calibrator, windshield, executive kit case, USB download cable, Insight data management software, batteries and calibration certificate

CEL - 633 Environmental Kit

An environmental noise monitoring kit is available which protects the instrument and microphone from the weather and allows unattended monitoring for up 10 days.