South Coast Science - Model Praxis/Urban - Air Quality Monitoring System
The South Coast Science Praxis offers an out-of-the-box solution for urban air quality monitoring. The Praxis answers both the challenge of capturing accurate data in variable climate conditions and the need for fine grained air quality monitoring networks. The Praxis offers ultra low noise sensing for gasses (CO, H2S, NO, NO2, O3, SO2, CO2) and particulates (PM1 , PM2.5 and PM10). The device supports multiple analysis techniques including any sampling rate and real time access.
Consistent device function is possible within broad climate range (T/rH) with a casing rated for hostile environments. This includes continuous operation for up to 2 hours in the event of external power loss.
Use Praxis to build a high density air quality network using low-cost, individually baselined devices that use open source device firmware for highly customisable sensing, data delivery and analysis.
Indicative air quality monitoring in practice
- Alphasense optical particle counter (OPC-N3): PM1, PM2.5 and PM10.
- Alphasense electrochemical sensors: CO, H2S, NO, NO2, O3, SO2 and CO2.
- Photoionisation detection (PID): VOCs.
- Temperature, humidity (T/rH) and barometric pressure (p) sensors.
- High frequency sampling: up to 2 samples per second.
- Up to 2 hours operation in event of external power loss.
- Enclosure designed for ultra-low RF noise and harsh climate.
- Ultra low noise sensing for gases (ppb) and particulates (μg/m3).
- Support for multiple analysis techniques including any sampling rate and real-time access.
- High density air quality network using low-cost, individually baselined devices.
- Open source device firmware for highly customisable sensing, data delivery and analysis.
- Remote Diagnostics, over-the-air software update and data-correction upgrade*
The South Coast Science ‘Praxis/Urban’ was designed in consultation with the UN Environment Programme
- Alphasense analogue front-end (AFE) supporting up to four A4 electrochemical sensors, or three electrochemical sensors plus PID. NDIR for CO2 sensing via separate interface.
- Ultra low-noise circuitry maximises repeatability of electrochemical sensing.
- Particulate monitoring uses Alphasense OPC-N3 particle counter.
- Sensirion temperature and relative humidity sensor.
- NXP barometric pressure sensor.
- Data correction refined through co-location with government reference equipment.
- Wired: ethernet via waterproof RJ45 connector.
- Wireless: 4G cellular modem.
- Wi-Fi option available upon request.
- GPS receiver.
- *Remote diagnostics (available where our data infrastructure is used).
- Runs Debian Linux operating system for robust operation and ease of integration with other sensor systems.
- AM335x ARM Cortex-A8 through BeagleBone Black or BeagleBone Black industrial.
- Real-time clock with battery backup. Time synchronisation is via GPS receiver, network time protocol or real-time clock, as available.
- Sense data messaging, control messaging and data storage using Amazon Web
- Services (AWS) or customer’s own infrastructure.
- Local microSD data storage.
- 7 to 24 V DC input.
- Environment operating range: -10 to 50°C.
- Measures 250 x 200 x 147 mm.
- Weighs 4kg.