15-year
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The MK427 Noise Sensor
Noise MonitorsThe MK427 Noise Sensor from Cirrus Research is an accurate, reliable and weather proof self-contained outdoor noise monitor, specifically designed for integration with other data logging and monitoring systems.
- Self-contained noise sensor for integration with external data loggers
- Purpose designed for long term environmental noise monitoring
- Industry standard 4-20mA output
- Automatic calibration with electrostatic actuation
- Weatherproof and suitable for most outdoor applications with a range of mounting solutions and an IP65 rating
The MK:427 Noise Sensor
with 4-20mA Current Loop Output
Unlike a conventional Sound Level Meter, the MK:427 Noise Sensor converts the noise level in decibels into an industry standard 4-20mA output, which can be connected to standard DCS/SCADA based systems to add a noise measurement capability.
The analogue electronics are highly reliable and operate without any user intervention. No specialist acoustic knowledge is required when using the MK:427 Noise Sensor, simply power-up the device and the measured noise level is continuously fed to the output.
Many industrial plants have a variety of process sensors strategically placed around their site so that safety, environmental impact and efficiency can be monitored and managed in real time from one of more control rooms.
Learn more about our MK427 Noise Sensor
If you would like to learn more, a member of our team will be happy to help
The MK427 is a self-contained outdoor noise sensor designed for long-term environmental noise monitoring. It converts measured sound levels into an industry standard 4–20 mA current loop output that can be integrated into systems like DCS, SCADA or other data logging platforms.
The sensor measures A-weighted sound pressure levels (dB(A)) and continuously outputs a proportional 4–20 mA signal, where current represents the sound level, with no specialist acoustic knowledge required.
Yes. The MK427 is fully weatherproof (IP65 rated) and built for permanent outdoor deployment, making it suitable for environmental, industrial and boundary noise monitoring.
The standard MK427 typically measures noise from around 30 dB(A) to 100 dB(A). Other measurement range options can be provided on request to suit specific applications.
No, the MK427 uses analogue electronics and does not require any third-party software to output noise levels. Simply power the unit and integrate the current loop into your monitoring system.
It meets Class 1 sound level meter standards to IEC 61672-1:2002, ensuring accurate and reliable noise measurements for professional applications.
It runs from an external +12 V DC supply and comes with a 10 m output cable as standard (other lengths available on request). The mounting kit for pole installation is included.
The MK427 is ideal for:
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Environmental noise monitoring
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Industrial site noise measurement
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Integration with control room systems (DCS/SCADA)
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Remote, unattended outdoor installations
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Boundary and compliance noise assessments
No. The MK427 outputs continuous noise data via the 4–20 mA loop without requiring any specialist acoustic setup or configuration.
Applicable Standards
Class 1 to IEC 61672-1:2002
Output type
A-weighting sound pressure level output in the form of a 4-20mA loop
Frequency weighting
dB(A) to IEC 61672-1:2002
Time weighting
Factory-set to Fast (F) IEC 61672-1:2002
Automatic calibration
Electrostatic actuator system with DC voltage control
Measurement range
30 – 100dB(A)
Other options are available on request
Current loop output
Iout = 0.1mA/dB
Dimensions
1m length
Weight
4.5Kg
Mounting
240mm x 30mm diameter pole
Mounting kit provided
2 U-brackets, 4 nuts, 3 Jubilee clips
External power
+12V DC in
Output cable
10m as standard.
Other lengths are available on request
IP rating
65
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