Frequently asked Questions
NVD- DUST MONITOR
1. Can I add gases?
Yes – the dust sentry & the dust profiler have the option to add the following gasses.
2. Can I add a weather station?
Yes – anemometers for windspeed and wind direction can be added to the dust monitor at an additional fee. The measured data will be displayed in the grid.
Free weather data is also available in the calendar view which is pulled in from a local weather station. The coordinates need to be added to the monitor to enable this.
3. What does all the data mean?
In the Sonitus cloud there are 3 different ways to display the data.
Charts | The chart view will display a level versus time graph of your readings. The parameter displayed is Particulate Matter uq/m3. Depending on what unit is used PM1, PM2.5, PM10 and TSP can be logged.
Calendar | The calendar view will show a monthly overview of the daily PM10 averages. The calendar view is an easy way to report your data.
Grid | The grid view will display all the raw data in a table.
4. What are the power options for the Aeroqual dust monitor?
The Aeroqual dust monitor currently only runs on 110v or 240v mains power.
5. What regulations do I need to comply with?
Generally, the standard limits come from the World Health Organisation recommendations which is what CA sets up as default.
Limits can also be agreed by the council or mentioned in a code of practice.
6. How often does the unit need calibration?
Calibration can be done at our lab in Essex and is biennial. There are 2 different ways of calibration;
Verification | the dust monitor is placed next to a reference stations for 7 days to confirm it operates within the allowed tolerance.
Engine swop | the engine will be swopped with a calibrated engine. This can be completed on site which makes it the quickest but more expensive way.
7. What kind of on-site servicing is required?
The dust monitor requires regular on-site service. Depending on the area and measurement results this is recommended every 3 to 6 months. This can either be completed by the client or by CA. Standard site service requires;
Flow check | to make sure the correct airflow is going through the system.
Leak check | to make sure there are no leaks in the system.
Filter change | Replacing both the purge and sample filter.
Good servicing will increase the lifespan of the pump and engine.
8. How and where can the monitor be mounted?
The monitor can be fixed on the hoarding, (brick) wall, scaffolding or tripod. General rules for fixing the units are as follow:
- Best practical mean;
- The inlet of the dust monitor needs to be fixed in free field which means it needs to be just above the hoarding or 1.5 meter away from any reflective surface.
- Monitors are generally fixed in locations to protect sensitive objects such as residential buildings, hospitals or schools.
9. My monitor is not online?
The Aeroqual dust monitor is a very reliable dust monitor that is just plug & Play. When units don’t appear to be online it mostly is a power related issue. Please see below standard troubleshoots:
When the unit is powered up the WiFi network will be visible. Go to settings, connections, Wi-Fi on any mobile device. If a network named ‘DS (serial number)’ appears the unit is powered up and running.
When opening the cabinet, the LED lights of the PC and modem are lit up.
When the unit is powered up the pump is running which is clearly audible.
Occasionally it happened the fuse has popped out. The fuse can be found in the left bottom and can just be pushed back in.
If all above is working accordingly it could be that the SIM card is kicked off the mobile network. Just unplug the unit and apply it back to mains to reboot the system.
If the unit still does not appear online, please contact Campbell Associates.
10. How do I navigate to the Sonitus Cloud?
On the Sonitus cloud there are several tutorials which will show how to navigate through the interface. Please go to ‘Support’ and click on Tutorial when logged in to the Sonitus Cloud.
here for a speedy training video of the online cloud interface.
11. Zero or negative values on my dust monitor
Usually when you see zero values they are negative values being truncated to zero. It is possible for negative and zero values to occur when you are measuring low levels of dust and it is not necessarily a fault with your system.
A dust monitor needs to set a ‘zero level’ for the dust level to identify the measurement floor of the system. To do this a purge pump is used, which reverses the flow of the air going through the measuring optics. The purpose of this is to clear any dust particles from the system before a zero measurement is taken. The zero cycle is automated by the system and is usually performed every 12 or 24 hours. If there is a problem the cycle can be activated manually and remotely.
When measuring low levels of particulate/ dust this could be close to or below the ‘zero value’ measured for the system. These levels are reported as Zero. Continued zero values which are inconsistent with site conditions could indicate a fault on the system and you should contact Campbell Associates. Likely causes are a dirty purge filter which needs changing, purge pump failure or problem with the measurement engine.
12. How to perform a flow check?