General Description
The AQMesh (
Version 4.0) is a wireless air quality device that measures ambient gases, humidity, and atmospheric pressure. The AQMesh v.4.0 measures gases including NO (0-4ppm), NO
2 (0-4ppm), O
3 (0-1.8ppm), CO (0-5ppm) and SO
2 (0-100ppm). The raw sensor signals are transmitted by GPRS to a secure cloud server where the raw output is processed. Processing includes mathematical processing which deals with cross-gas effects and environmental factors. Data can be accessed through a secure web login.
AQMesh v.4.0 was developed in 2014 and involved improvements in electrochemical sensors and the AQMesh processing algorithms. The process of sensor characterization include correction for environmental factors, correction of gas span and baseline offset. The previous version (AQMesh v.3.5) had been developed in 2013 and showed that air pollutants trends could be identified
Principle of Operation
This device incorporates electrochemical gas sensors with a fourth electrode to increase stability and combat drift. Precision is maintained by reducing noise levels in the circuit to a few parts per billion. It also uses proprietary catalyst loading and stack structure to certify steady operation at low concentrations.
Features
- Dimensions: L170 x W220 x H250 mm (not inc. antenna 180mm)
- Weight: <2 kg
- Battery: Primary Lithium metal batteries (lifetime up to 2 years)
- Power supply: External 12V DC power
- Sensor lifetime: Up to two years
- Clock function: Yes
- Sampling mechanism: Passive
- Environmental operating conditions: Temperature range: -20 to +40 Deg C, Relative Humidity range: 15 to 85% RH
- Internal data logging: Yes (Cannot be accessed except through cloud server)
- PC data logging: Web browser based, processing of raw data to give indicative concentration, database storage on secure server, data access – tables, graphs, data download, multi-user access, password controlled
- Communications: GPRS
- Weatherproof: Yes
Applications