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SE3-320W Noise Processor

Outdoor Noise Processor
Outdoor Noise Processor

Price List

Outdoor Noise Processor
In stock

Sound Level Calibrator - Class 2
In stock
Five Outdoor Noise Processors and one Noise Meter
Lead time 1 week

Ten Outdoor Noise Processors and one Noise Meter
Lead time 1 week
Power supply with 24V DC output
In stock

DC power extension cable 10m (32ft) for 24V power supply
In stock

The delivery price is calculated during checkout based on your location and the goods ordered. Our basic delivery prices are:

Delivery within Ireland: €27.00

Delivery Service: Three working days*

* For products that are in stock and the order received by midday.

Some products go through a final configuration and calibration before being shipped. If the calibration labs are busy this can add up to two days on to the delivery schedule but guarantees a fresh calibration.

Outdoor Noise Processor
In stock

Five Outdoor Noise Processors and one Noise Meter
1 week


  • Weatherproof for Outdoor Noise Monitoring
  • Minimal or no display of noise levels
  • Long term sound level monitoring, data transfer by USB memory stick
  • Link to your monitoring or process control system (DC or current loop output)
  • Suitable for dusty environments


  • Outside Factories
  • Industrial Sites
  • Entertainment venues


The Outdoor Noise Processor mounts on the wall to monitor and record the sound levels. The digital display usually shows the current sound level, but this can be switched off or even set to display the time.

Its purpose is to continuously monitor the sound levels, recording the sound level for download to a computer via memory stick. It can also be linked directly into an existing process control system via the 4-20mA Current Loop or the DC output. For a long term outdoor noise monitor, output to a control system is the most common way of using it.

Data Logging

The SE3-320W has a large internal memory, to which it can store various sound level parameters every second. It can store the Fast or Slow sound level with "A" or "C" frequency weighting. You can select whether it stores all of these parameters or just the ones you need. When you plug a memory stick in the SE3-320W will automatically transfer the measurements on to it. You then plug the memory stick into your computer to load the measurements into the SoundEar software.

Connect to Process Control Systems

The SE3-320W can be linked in to existing monitoring and process control systems, or you can develop your own monitoring system, using either the DC output or Current Loop output.

4-20mA Current Loop

This is a standard method of electrical signalling, used by many process control systems, with the benefit that the signal is not degraded by voltage drops in the wiring. For more information please visit the Outputs page.

0-10V DC Output

The DC Output from the Outdoor Noise Processor provides the measured sound level over a range of 0 to 10V DC, which can be measured using a basic A-D converter. For more information please visit the Outputs page.


The digital display on the SE3-320W usually shows the current sound level, updating every second. However, it can be set to any of the following:

  • Slow sound level, dB(A)
  • LAeq,1s (average sound level, Leq, every second)
  • Time
  • Off (display is blank)

Turning the display off or displaying the time can be useful if you don't want to show the sound level in decibels.

Noise Monitoring Applications

The Outdoor Noise Processor (order code SE3-320W) is for long term noise monitoring in areas where it may be exposed to the weather or high levels of dust.

When downloaded to a computer you can easily identify the noisy times of day and the limits reached.

Outdoor Noise Monitoring

This monitor is protected against the weather and dust, rated to IP65. It can be mounted to a wall outside with four screws. A 10m (32 ft) power cable is included, to connect to the indoor power adapter that is also included.

Process Control Systems

Many process control systems can accept analog signals meeting the 4-20mA current loop standard. The standard unit (order code SE3-320W) has two 4-20mA current loop outputs, which can be configured using the software included.

There is more information on the Outputs information tab.

Integration with Other Applications

The SE3-320W Outdoor Noise Processor has two DC outputs that can be used for integration with your own applications. Typically connected to an A/D converter, the sound levels can be monitoring continuously.

For more information about the DC voltage output, please visit the Outputs tab.


The weatherproof noise processor mounts with four screws that are accessible from the front of the case with the front panel removed.

A 10m (32ft) power cable is already fitted to the monitor. It is the white cable visible in the image. This power cable plugs into the 24 VDC power supply that is included. The power supply is not protected against the weather and so should be mounted indoors or inside its own weather-proof enclosure.


The noise monitor can also be provided with additional cables for access to the 4-20mA outputs or the 0-10V DV outputs. Otherwise you can fit cables to these through a weatherproof grommet to the screw terminals inside.

For downloading noise measurements via USB stick, a weatherproof USB socket is fitted to the bottom of the enclosure, between the microphone and power grommet.


power adapter

The SE3-320 comes complete with a power adapter. This provides the safe low voltage that the noise sign requires.

Extension Power Cable - If you need to run power for a longer distance then you need the POWEX10 extension cable.

Mounting the SE3-320W

With the front panel removed you have access to the four mounting holes, seen at each corner in this image.

wall mounting the noise processor
Wall Mounted Noise Processor

The unit is delivered with a 10m power cable already fitted, and sealed through a gland at the bottom of the case. This cable has a connector on the end that connects to the power adapter. If you have another 24 VDC supply available then the connector can be removed and the wires connected to your existing supply. In this case we recommend fitting an inline fuse.

Noise Processor Software

The SE3-320W Noise Processor comes complete with software to configure, download and display the results.

  • Configure the data logging settings
  • Download measurements

The outputs can be configured to:

  • 4-20mA current loop or 0-10V DC output
  • Sound level, frequency weighting, etc.

The software is included with the SE3-320W at no extra charge. It is designed for all recent versions of Windows. It communicates with the noise processor via the computer's USB port. Downloads and configuration can be carried out via a memory stick, so you don't have to take the processor down from the wall each time.

Live and Historic Measurements

With a Noise Processor connected to the computer's USB port, the software can show the sound levels in real time.

To download historic measurements it is not necessary to connect the processor to the computer. You can plug a standard USB stick into the sign and it will automatically transfer all its measurements. With the memory stick connected to the computer the SoundEar software will now download the measurements. In the image above you can see the sound levels graphed over a 24 hour period.

Analog Output

Using the software you can set the output from the sign to be either a DC level (0 to 10V) or current loop (4-20mA) for integrating into other logging and monitoring systems. You can also set the minimum and maximum sound levels that are then mapped onto this DC or current loop output. For more information, please visit the Outputs tab.

Data Logging Settings

The Noise Processor stores noise measurements in its internal memory. You can configure it to store a minimal amount of information for longer, or to store everything for a shorter period of time.

For most applications the Noise Processor's internal memory is large enough for more than 18 months storage without download - although of course we would recommend regular download to avoid data loss.

noise processor software
Noise Processor Software

Digital Display Settings

The SoundEar software can configure the sign's digital display to show:

  • Slow Sound Level dB(A)
  • LAeq,1s (1 second LAeq)
  • Alarm Level
  • Time
  • Nothing (the digital display will be off)

Although the default is to show the sound level, it can be useful to turn this off if it causes confusion (not everybody understands dB) or if it causes people to make noise to see how loud they are!

Microphone Calibration

If you have a Sound Level Calibrator and need to ensure the accurate operation of the Noise Processor then the software deals with this. Connect the SE3-320W Noise Processor to the software, connect a microphone extension cable and fit the calibrator to the microphone. The software Microphone Calibration option will then deal with the process of checking and adjusting.

Noise Processor Outputs

The SE3-320W Noise Processor has two outputs available. These outputs can be configured to either:

  • DC Output 0 to 10V for monitoring using an A/D converter
  • Current Loop 4-20mA for integration into a process control system

Each of the outputs can be configured to provide:

  • Fast Sound Level dB(A) or dB(C)
  • Slow Sound Level dB(A) or dB(C)
  • Leq 1 minute, Leq 15 minute or Leq 60 minute

The range of dB measurement covered by the DC voltage or 4-20mA loop is set using the software.

noise processor settings
Setting the Outputs from Software

Connecting Up

At the rear of the noise processor (inside the weatherproof box) there is a connector block. This connector pulls out of its socket and contains screw terminals to connect the following:

  • 24VDC Supply
  • Current Loop or DC Output 1
  • Current Loop or DC Output 2
  • Output Ground (common to both outputs)

Current Loop 4-20mA Output

The Noise Processor includes standard 4-20mA Current Loop outputs. These provide a signal that does not degrade due to resistance, allowing for longer cable runs, limited by the ability to drive the current.

  • Selectable dB measurement range
  • Select Fast/Slow, Max or Leq for output
  • Periodic Leq output option

DC Output 0-10V

The Noise Processor also includes DC Voltage Outputs that are proportional to the measured sound level. They are ideal for level recorders and input to data logging systems.

Two Outputs

There are two current loop / DC outputs on the SE3-320W, so you can select two different parameters to monitor. Both outputs are set to the same measurement range, but you can select different parameters, as described below.

Output Parameters

Each output can be one of the following noise measurement parameters:

  • LAFmax (maximum Fast sound level)
  • LASmax (maximum Slow sound level)
  • LAeq,1s (average sound level every second)
  • LCpeak ('C' weighted Peak)
  • LAeq,15 (average sound level over 15 minutes)
  • LAeq,30 (average sound level over 30 minutes)
  • LAeq,60 (average sound level over 60 minutes)

Measurement Range

The overall measurement range of the Noise Processor is 30dB to 120dB. You can process this whole range over the current loop or DC voltage output, or you can select the range of interest.

Purchasing Options

The standard Outdoor Noise Processor order codes (SE3-320W or SE3-320W-x for multi packs) include everything needed for most applications:

  • SE3-320W Noise Processor
  • Plug-in Microphone
  • Software
  • Power Adapter

Multi Packs

The SE3-320W-x Multi Packs include all these items for each SE3-320W. They also include an NM102 Hand Held Sound Level Meter, which can be used for making quick measurements of sound levels in the surrounding area, and can be helpful when setting the noise processor up.

Single Outdoor Noise Processors and Multi-Packs

Order Code
SE2-320WOutdoor Noise Processor
With data logging and 4-20mA current loop / DC output. Includes microphone, power adapter and software.
SE3-320W-5Pack with 5 Outdoor Noise Processors and a Sound Meter
This package includes five SE3-320W processors and a hand-held sound level meter.
SE3-320W-10Pack with 10 Outdoor Noise Processors and a Sound Meter
This discounted package includes ten SE3-320W processors and a hand-held sound level meter.

Options and Accessories

CR514Sound Level Calibrator
A Class 2 calibrator for checking the function and accuracy of the noise processor.
PSU24DC24VDC Power Adapter
Standard 24 VDC plug-top power supply unit.
POWEX10Power extension cable 10m
Working at a greater distance from the power outlet.

Technical Specifications

Frequency Range20Hz to 20kHz
Measuring Range30 to 120 dB
Deviation± 0.5 dB
Frequency Weighting"A" ("C" weighted Peak)
Time WeightingFast and Slow
Digital DisplaydB(A) Slow, LAeq, Alarm settings, Clock
Outputs"A" weighted, 0-10V or 4-20mA
USB Ports1. Micro USB (power and PC connection)
2. USB Controller (for USB memory stick connection)
Internal Memory16MB (128MBit) - 600 days
Dimensions150 x 290 x 75 (with microphone and windshield fitted)
Weight820g, 1lb 13oz
Power24 VDC (screw terminal, cable already fitted)
Acoustic StandardsIEC61672-2-2002 Class 2, ANSI S1.4 Type 2