Environmental Monitoring Equipment & Supplies • Sales, Rental & Service by Enviro-Equipment — Charlotte, North Carolina USA

  • Type 2 Sound Level Meter for general noise measurements.
  • Datalogging Capability: 100 separate run capacity with up to 65,000 samples for each run (1, 2, 5 or 10 second intervals).
  • Measurement Ranges: 30-100 dB and 60-130 dB.
  • "A" and "C" Frequency Weightings; Slow, Fast, and Impulse Time Weightings.
  • Field calibrator and annual factory calibration certificate included.
  • Displayed parameters: Instantaneous level (Lp), Maximum level (Lmx) and Time Average Level (Leq or Lavg).
Title Daily Rate Weekly Rate Monthly Rate
Casella CEL 246 Datalogging Sound Level Meter Rental $60.00 $145.00 $375.00

The CEL-246 is a simple integrating sound level meter that is ideal for use in many situations where a quick idea of the current noise level is needed. It features 2 ranges from 30 to 100 db and 60 to 130 db and provides the standardized A and C broadband frequency weightings required by many protocols. The CEL-246 also has the Slow, Fast and Impulse time responses. A maximum hold function with a user reset is available to capture the highest level of noise to give a "worst case" measurement if needed.

Results are displayed on a graphic LCD in either alpha numeric format or as a scrolling time history with either 1 or 5 minutes time history graph so that recent peaks and troughs may be viewed.

Calibration is as simple as placing the calibrator over the microphone and switching it on. As soon as the calibration tone is steady it is automatically detected by the CEL-246 and the user is offered the choice of performing the calibration with a single button press.

The CEL-246 adds on board storage capability at fixed 1, 2, 5 or 10 second intervals of the average sound level with the selected frequency weighting and time response and exchange rate. Up to 99 runs can be stored each of up to 18 hours maximum continuous run time at the 1 second rate or more than 7 days at the 10 second rate. All runs are stored in memory tagged with the start date and time using the meter's real time clock so they can be correctly identified when the unit is connected to a computer.

The CEL-246 is provided with a standard quarter inch socket so that it can be mounted on a tripod or other similar fixtures in a secure manner. A small foam windscreen provided as a standard accessory protects the microphone from wind induced errors when making measurements and a wrist strap minimizes the risk that the meter will not be dropped when in use.

Items Included:
  • CEL-246 Sound Level Meter
  • Acoustic Calibrator
  • Factor Calibration Certificates
  • CEL-6840 Carrying Case
  • CEL-6841 Windscreen
  • CasellaDrive and DB24 Software
  • USB Download Cable
  • Instruction Manual
  • Spare Batteries


ANSI S1.4 Type 2, IEC 61672-1 2002-5

Microphone type

¼" Electret mic. in standard ½" fixed housing

Reference conditions

68°F (20°C) air temperature, 65% Relative Humidity, 1013 mbar (101.325 kPa) atmospheric pressure.

Operating Temperature Range

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)


3 x AA Alkaline or rechargeable types

Battery life

up to 35 hours

Dimensions w x h x d

2.8 x 8.3 x 1.2 in (71.5x 212.0x 31.0mm) including preamplifier and microphone

Weight including batteries

8.8 oz (< 250g)

Operator controls

buttons for power On/Off and 2 x context sensitive menu selection plus initial configuration screen

Total measurement range

30 to 130 dB

Dynamic span on single range

70 dB

Number of measurement ranges

Low: 30-100 dB, High: 60-130 dB

Noise floor (A weighted dB)

< 33

Frequency weightings

A and C

Time weightings

Slow, Fast, and Impulse

Displayed parameters available on all user screens

Instantaneous level (Lp), Maximum level (Lmx), Time avg. value – Leq, Lavg

Reset of maximum and average level by user

Yes – with non-decaying max hold

Display type

128 x 128 dot matrix LCD digital including real-time analog bar graph scale

Display resolution – numeric

0.1 dB

Display resolution – graphical

1 dB

Update rate for display

0.5 seconds

Displayed time span for time history chart

Last 1 or 5 Minutes

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 without the need for user adjustment

External power option (5 Vdc)

Yes with CMC51 cable via USB socket

Analog outputs

AC (and optional DC) via 2.5 mm jack socket

AC output characteristics

Approx 0.85V RMS FSD output on selected sound level measurement range. Minimum load impedance 22kΩ - (Provided for DAT tape / PC wav file recording or headphone applications).

DC output characteristics

0 to 1.3V DC for FSD on selected range. Output corresponds to selected frequency and time weighting. 2kΩ Output impedance (Provided at time of order as option for connection to chart recorder or pc data logging system).

Digital output

USB 2.0 format of instantaneous sound level via 'mini A' USB socket (also powers meter)

Digital output characteristics

Instantaneous SPL output (software required) as per selected frequency and time weightings (value output once per second).

Memory storage in up to 100 separate runs

Up to 65,000+ samples per run of 1, 2, 5 or 10 sec. average sound level to a max. of 419,000 samples, with date and time stamp from internal real time clock