Automatic aerosol monitor

Automatic Aerosol Monitor Concept. Functional Requirements. An ideal monitor would automatically collect and analyze aerosol samples and record geographical, meterological, and oceanographic data. It would be capable of operating unattended for the length of a typical cruise (2-4 weeks), and would vary sample collection to adapt to widely differing conditions. It would store data in a standard format accepted by interested laboratories, and display selected results in real time. Finally, the ideal monitor would be constructed mostly from commercially available components. 

Aerosol monitor(s), automatic concentration range problems, 64 concepts, 63 data storage, 62 filter-paper tape, 66-67 flow conditions, varying, 65 isokinetic flow, 64 sample manipulation, 66 sampling time, 65-66... 

Another type of aerosol monitoring device relies on the behavior of a piezoelectric crystal, whose oscillation frequency changes with the mass of aerosol deposited on it. It is called piezoelectric mass sensor. After each sampling period, the concentration of the aerosol is displayed and the crystal is automatically cleaned and ready for the next measurement. Sampling efficiency is affected by both the mass and the size of the particles. Very low sensitivity is observed when the particle size is larger than 10 pm in diameter or larger masses of particles are collected. 

Aerosol sampling instruments were housed in an air conditioned monitoring trailer operated by NWC. The particle light scattering coefficient, bg, was continuously measured with modified MRI Model 1561 integrating nephelometer. The nephelometer automatically zeroed daily and was calibrated quarterly. 

The camera, including the lens, is cooled in the harsh environment by compressed air from a mechanical air conditioner that circulates under positive pressure to cool the camera housing. Compressed air from a separate source goes through the protective lens tube and out its end. An air filtration system removes aerosols, vapor, oil, and particles as small as 0.03 microns. Automatic retractors pull the tube and camera back about 2 feet if the kiln shuts down. Additional cameras can be mounted in the clinker-cooler area to monitor "bridging," where material could accumulate and block removal of the cooled limestone. 

T 0 control the spread of aerosol and the combustion of sodium, the ventilation system will be shut down more quickly by signals from the newly installed integrated leakage monitoring system. At present, in the case of small and medium-scale leaks, the shut down of the ventilation system is carried out manually by the operators. Only in the case of a large sodium leak, the ventilation is shut down automatically by an interlock signal from an abnormally low level in the steam generator. At present, if a small or medium-scale leak occurs, the sodium aerosol spreads from the leak site room to all areas that are connected by the ventilation ducts until the ventilation system is shut down. 

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