Cirrus MK427 Noise Sensor

Cirrus MK427 Noise Sensor

Permanent and reliable outdoor microphone

The pure-analogue electronics are highly reliable and operate without any user intervention. No specialist acoustic knowledge is required – simply power-up the Noise sensor and the measured noise level is continuously fed to the output.

The outdoor microphone assembly has proven reliability for long term permanent use even in the harshest of outdoor environments where upgrade to the WS:73 extreme condition windshield is recommended.

Automatic self-calibrating system

The electrostatic calibration system provides automated remote calibration of the system using a simple +5V trigger. This allows the performance of the system to be routinely verified which ensures compliance with international standards and is both time saving and especially useful where the unit is installed in a difficult to access location.


  • Robust, fully weather protected Class 1 outdoor microphone

  • Straight forward integration with Industry standard 4-20mA current loop systems

  • Eliminates the need for third party software

  • 30 to 100dB(A) standard range ideal for most applications (other options available)

  • Proven long term reliability in harsh outdoor environments

  • Verification through regular scheduling for remote calibration using integrated ‘auto-calibration’ system

  • Outdoor Windshield and bird spikes to protect the microphone

  • Entire length of the MK:427 NoiseSensor is 1m

  • Simple mounting and installation for quick deployment