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New air quality standard notified by Govt. of India where measurement of PM10
and PM2.5 dust is required simultaneously with other pollutants to decide status
of air pollution. So far samplers developed in India do not have provision for
simultaneous sampling of PM10 and PM2.5 dust. Thus two samplers need to be
operated simultaneously to know prevailing concentration of these pollutants in
ambient air. This results measurement of these parameters expensive and
cumbersome as significant efforts are required in transportation and operation
of two sampler at one place simultaneously.
Ecotech realizes these limitations and took lead to develop impactors based
Combo Sampler for simultaneous sampling of PM10 & PM2.5 dust using single
instrument.
Single stage impactor matching to European Union designs incorporated in the
Combo Sampler for PM10 measurement. This impactor removes dust greater than 10
microns from ambient air when sucked through it at constant flow rate of 2.3
m3/hr .
For sampling of 2.5 micron dust two stage impactors based on the USEPA standard
designs have been incorporated in AAS 271.This impactor removes dust greater
than 2.5 microns from ambient air in two stages( first in PM10 impactor and
second in WINS impactor fitted in series ) Air is sucked through it at constant
flow rate of 1.0 m3/hr.
Ecotech AAS 271 is fitted with one of the best brushless and noiseless non
pulsating pumps of adequate capacities to generate needed sampling rates for
PM10& PM2.5 streams. Constant flow rates in both air stream are maintained
through out sampling duration with the help of critical orifices. Pump assembly
is equipped with heavy duty induction motor which ensures that sampling rate are
not affected due to input voltage fluctuations.
AAS 271 is equipped with two flow meter which continuously display sampling flow
rates of two streams controlled by orifice.
Glass Microfibre filters of 47mm dia is used for PM10 sampling while PTFE
membrane are used for PM2.5 sampling. All components of Impactor are made up of
corrosion free metals fabricated with the help of CNC machines to ensure desired
precision.
Modular design of sampler, tubing and other fitments made this sampler simple
easy to transport & operate can be used successfully in harsh Indian climatic
conditions
Performance of Combo Sampler has been evaluated by operating it in parallel of
two FRM USEPA certified reference samplers ( one operated for PM10 & another
operated for PM2.5 ) at National Environmental Engineering Research Institute
(NEERI) Nagpur. The results given by combo sampler and FRM sampler are
comparable. Thus the PM10 & PM2.5 values given by Combo sampler are reliable and
approved by NEERI Nagpur.
IIT Kanpur has also evaluated performance of Combo Sampler where it was operated
for one year. Observed results are found comparable with certified reference
sampler
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