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Home > Applications > Noise System Integration -> 4-20mA Current Loop

Interfacing and System Integration - 4-20mA Current Loop

This range of noise processors and noise warning signs have a standard 4-20mA current loop output that maps to the measured sound level. 4-20mA current loop is a common method used by industrial process control systems (SCADA, PLC, etc) to monitor analog signals. The main advantage of current loop over a DC output is that the signal is not affected by voltage drops due to resistance in the cabling. With the devices listed here, the minimum signal (4mA) and maximum signal (20mA) can be mapped to sound levels, ensuring the measurements cover the range that you are interested in.

Noise Processor
with 4-20mA Current Loop

Noise Processor  with 4-20mA Current Loop

This compact unit can be wall mounted. The display can show sound level, temperature or nothing at all for more discreet monitoring.

  • Compact, wall mountable
  • Programmable 4-20mA output
  • Fast, Slow, Max or Leq
More information...

Noise Warning Sign
with 4-20mA Current Loop

Noise Warning Sign  with 4-20mA Current Loop

A wall mounted noise activated sign that warns staff when the sound levels are too high, with programmable noise warning levels.

  • Wall mounted noise activated sign
  • Programmable 4-20mA output
  • Fast, Slow, Max or Leq
More information...

Industrial Noise Sign
with 4-20mA Current Loop

Industrial Noise Sign  with 4-20mA Current Loop

A wall mounted noise activated sign for industry that warns staff when they need to take action to protect their hearing.

  • Wall mounted noise activated sign
  • Programmable 4-20mA output
  • Fast, Slow, Max or Leq
More information...

Which Noise Parameter?

You can select which noise parameter you want on the current loop output. For a live display you would usually choose the LAeq,1s (average sound level every second) or the Maximum Fast or Slow sound level.

The output can be set to give the LAeq average sound level over 15, 30 or 60 minutes. This is ideal where limits are set based on the periodic Leq.

The parameter is set using the software that is included.

Measurement Range

The overall measurement range of these devices is 30 to 120 dB(A). However, you may not be interested in the full range, so it can be set accordingly.

For example, in an industrial environment you may only be interested in noise levels between 70dB(A) and 110dB(A). In this case you could set the output so that 4mA corresponds to 70dB and 20mA corresponds to 110 dB.

The range is set using the software that is included.

 

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