The CEL-120 Acoustic Calibrator is the smallest of its
type in the world; with a rugged, over-moulded design
for use in field environments.
The field calibration of Sound Level Meters is an
essential procedure when carrying out any type of
noise survey both before and after each measurement
sequence. This ensures that instruments are providing
consistently accurate readings necessary for monitoring
to ensure compliance with workplace and environmental
The CEL-120 is therefore designed and manufactured to
comply with the requirements of IEC 60942: 2003 and
ANSI S1.40: 2006. These standards stipulate accurate
calibration over a wide range of temperature, humidity
and pressure conditions, typical of field work, ensuring
accurate calibration in all conditions.
Compliant with IEC 60942: 2003 and ANSI S1.40:2006
Class 1 & 2 accuracy versions
Digital technology ensures highly stable acoustic performance
Dual calibration level (Class 1 version) of 94dB and 114dB at 1khz
Rugged, ergonomic design
Simple to use with incorrect microphone insertion warning
Automatic power off to conserve life of battery, typically 2 years
The CEL-120 is compact and ergonomically designed with
simplicity and ease of use being the highest priorities.
Key features include a simple keypad for intuitive control,
permitting calibration level changes when required. When
used with instruments like the CEL-600 series, calibration
routines commence automatically as soon as a calibration
tone is detected to further simplify the task.
The CEL-120 uses a MEMS microphone and a digital
feedback loop to maintain the acoustic pressure in the cavity
at the required level. An indicator shows if the sound level
meter microphone is incorrectly inserted into the cavity,
removing any potential for calibration error.
The microprocessor control detects when the microphone is
removed and automatically switches off the calibration tone.
This conserves battery power, allowing batteries to last for up
to 2 years of operation.
Both the CEL-120/1 and CEL-120/2 calibrator accept all
industry standard 1/2“ microphone capsules. Smaller 1/4“
microphones may be accommodated using the 1/2“ to 1/4“
adaptor (CEL-4726). The relevant CEL-120 also comes as
standard with our range of noise monitoring kits.