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Sensing
Alphasense analogue front-end (AFE) supporting up to four A4 electrochemical sensors. Additional NDIR CO2 via a separate interface. Other combinations on request
Particulate monitoring uses Alphasense OPC-N3 particle counter
Sensirion temperature and relative humidity sensor
TDK barometric pressure sensor
Ultra low-noise circuitry maximises repeatability of electrochemical sensing
Data correction refined through co-location with UK government reference equipment
Communications
Wired: ethernet via RJ45 connector
Wireless: 4G cellular modem
GPS receiver
Platform
AM335x ARM Cortex-A8 through BeagleBone Black
Real-time clock with battery backup. Time synchronisation is via GPS receiver, network time protocol or real-time clock, as available.
Data infrastructure
Sense data messaging, control messaging and data storage using Amazon Web Services (AWS) or customer’s own infrastructure
Local microSD data storage
General
DC power input from 7 to 12 V, rechargeable battery (approximately two hours operation)
Environmental range from -40 to +50 °C
Dimensions: 250 x 200 x 147mm
Weight: 4 Kg
Power consumption: ~4 W
