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Outdoor Microphone with 4-20mA Current Loop Output
The MK427 is a weatherproof Outdoor Microphone with a
standard 4-20mA Loop output. It can easily be connected to
an existing process control system such as SCADA.
- Industrial sites
- Power Stations
- Anywhere with a compatible process control system
The analogue Current Loop output can be connected over relatively
long lines without degrading the signal, making it ideal for
noise monitoring applications, where accuracy is of primary
importance.
The MK427 Outdoor Microphone meets the following standards and
specifications:
- 4-20mA Current Loop Output (0.1 mA/dB)
- Frequency (A) and Time Weighting (Fast or Slow)
to IEC 61672 and ANSI S1.4
- Measurement Range 30 to 100 dBA (other ranges optional)
- Electrostatic Actuator for automatic calibration checks
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MK427 Outdoor Microphone
4-20mA Loop Output |
Indoor Monitoring with 4-20mA Loop
Sometimes you may want to monitor noise within buildings at the
same time as monitoring outside. This may be to help control the
noise that escapes outside, or it may be for hearing protection
reasons. Although the MK427 can be used indoors, it's heavy weather
protection may make it too bulky and over expensive.
The ZE908 Acoustic Interface Unit also offers the 4-20mA loop
output, so it can be integrated with the same process control system,
but this time monitoring the indoor noise levels. Please visit
the Acoustic Interface Unit web page
for more information.
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Noise Monitoring System
We can provide complete Noise
Monitoring Systems including software. However, if you have a
process control system such as SCADA or another system that can take
a current loop input, the MK427 can be easily integrated
with it. The 4-20mA output is scaled at 0.1mA/dB, making the conversion
equation very simple. |
Typical SCADA Noise Installation |
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Installation and Options
Mounting - For acoustic reasons, the microphone is usually better mounted on a mast. However, this is not always convenient so we can provide it with a wall mounting bracket.
Calibration - For accurate noise measurements, a microphone should be checked regularly (daily or more often) for drift. The MK427 is fitted with an electrostatic actuator so this process can be automated.
Time Weighting - The microphone system can be factory set to either Fast or Slow time response in line with IEC 61672 and ANSI S1.4.
Measurement Range - The standard unit has a measurement range of 30 to 100 dB(A), which is ideal for most applications. Other measurement ranges are possible, such as 40 to 110 dB(A), 50 to 120 dB(A), etc.
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Installation Options
Mast or Wall |
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