• Quantitative atmosphere measurement for high quality information (decisions)
• Compact instrument design for network deployment with a small footprint
• Lower capital cost for affordable profiling, trending and assessments
• Reliable operation ensures low cost of ownership

• Urban air quality monitoring
• Near-road air quality monitoring
• Industrial perimeter air quality monitoring

• Continuous automatic measurement of multiple gases and particulates
• Calibration against NIST traceable primary standards
• Factory validated against USEPA and EU Reference Method instruments (2008/50/EC)
• Excellent linearity and sensitivity with negligible zero and span calibration slope drift
• Climate-controlled compact enclosure for pole or wall installation
• Active sampling via brushless pumps and PTFE filter
• Single-board computer with RS232 communication protocol
• Internal data storage via versatile Secure Digital (SD) card
• Continuous digital display of multiple parameters
• PC connection via USB plus software for configuration and data logging
• Programmable data logging frequency
• PC data reporting in units of ppm and mg/m3
• Remote diagnostics and digital gain adjustment
• Flexible and modular instrument platform
• Built-in zero air scrubber (programmable)
• Span calibration via supplied software (uses standard cal-gas)
• Remote communication options (GSM, RF, Internet)
  

Configuration

Any combination of 1-6 gas modules, particle monitor and various meteorological sensors

Dimensions (H x W x D)

Enclosure & TMS 850 x 460 x 310mm

With brackets & cowlings 900 x 555 x 400mm Height with PM inlet installed 1300mm

Weight

10-50 Kg depends on instrument configuration

Operating Environment Range

-20 to +55° C Thermal Management System (AC compressor cooler & internal heater)

Power Requirements

100-240VAC or 12VDC option

80-160W depends on instrument configuration

Approvals & Conformity

Part 15 FCC Rules, US 21 CFR 1040.10, AUS/NZ C-tick, 2004/108/EC, 2006/95/EC, 72/23/EEC, US 40 CFR 53.20 Performance Specifications for Automated Methods for O3, NO2 and CO

Analytic Gas Sensitive Semiconductor (GSS) technology is exclusive to Aeroqual. It is a combination of smart measurement techniques and mixed metal oxide semiconductor sensors that exhibit an electrical resistance change in the presence of a target gas.

Theory in Practice

This resistance change is caused by a loss or a gain of surface electrons as a result of adsorbed oxygen reacting with the target gas. If the oxide is an n-type, there is either a donation (reducing gas) or subtraction (oxidizing gas) of electrons from the conduction band. The result is that n-type oxides increase their resistance when oxidizing gases such as NO2 and O3 are present while reducing gases such as CO and hydrocarbons lead to a reduction in resistance.The converse is true for p-type oxides where electron exchange due to gas interaction leads either to a rise (oxidizing gas) or a reduction (reducing gas) in electronholes in the valence band. This then translates into corresponding changes in electrical resistance. Quantitative response is achieved as the magnitude of change in electrical resistance is a direct measure of the concentration of the target gas present.

Optimized Performance by Design

Since the surface reaction causes the change in electrical resistance in the sensing oxide, maximizing the surface area intensifies the response to gas. Aeroqual gas sensors consist of highly porous oxide layers, which areprinted onto 2.0 x 2.0 mm alumina chips. The electrodes are co-planar and located at the oxide/chip interface (see diagrams). A heater track is also applied to the chip to ensure the sensor runs “hot” which minimizes interference from humidity and increases the speed of response. The microstructure of the oxide, its thickness and its running temperature are optimized to improve selectivity. Catal ytic additives, protective coatings and activated-carbon filters are also applied to enhance selectivity.

Aeroqual’s GSS technology is the culmination of more than 25 years of materials research perfecting material formulations and optimizing sensor driver algorithms. Advanced Metal Oxide Semiconductor materials are manufactured to the optimum physical form for each specific gas (e.g. WO 3, doped Cr2O3, MoO3). Selectivity is achieved through smart instrument design and drift is minimized through proprietary micro-processor control of sensor operation and the use of optimized sensor materials. Aeroqual GSS sensor-based gas modules utilize active sampling and are designed to offer reference comparable accuracy, very low detection limits (ppb levels for O3, NO2, and NOx), and high reliability in a cost-effective and flexible package. These instruments have tracked reference analyzers for periods of months, without recalibration. They are ideal fordeployment as low-cost devices to extend the spatial coverage of air quality monitoring networks and provide a higher quality of data and information on any given day.