The document describes a high volume air sampler, which is an instrument used to monitor ambient air quality. It works by passing a high volume of air through a filter paper using a blower, which retains airborne particles on the filter based on Stokes' law. Key components include a blower, flow meter, timer, filter holder, and voltage stabilizer. It measures particulate levels by determining the change in weight of the filter paper after sampling a known volume of air over a set time period.

1. High volume Air Sampler
By
Dr. Asmita Daspute.
Assistant Professor,
Dept. of Environmental Science,
SBES College of Science, Aurangabad (MS

2. High volume Air Sampler
 High Volume Samplers are the basic instruments used to monitor Ambient Air
Quality.
 • They are in widespread use all over the world to measure air pollution in
industrial areas, urban areas, on the shop floor, near monuments and other
sensitive areas.
 It is working on Stokes law for collection of particulates.

3. Components of HVS
 • Heavy Duty Blower,
 • Orifice flow meter- measures flow,
 • Time Totalizer-records time,
 • Programmable Timer- measures time,
 • Instrument Cabinet- acts as protection,
 • Filter Holder assembly- holds the filter in position,
 • Voltage Stabilizer- guards against voltage fluctuation,
 • Detachable Gable roof- allows passage of air and protects filter.

6. PRINCIPLE OF OPERATION
1. • In these samplers, air-borne suspended particulates (SPM) are measured by passing air at a high flow-rate
of 1.1 to 1.7 cubic meters per minute through a high efficiency filter paper which retains the particles.
2. • The instrument measures the volume of air sampled, while the amount of particulates collected is
determined by measuring the change in weight of the filter paper as a consequence of the sampling.
3. • The passage for air reaching the filter is designed to prevent heavier settleable dust particles from
reaching the filter (by provision of cyclone) thus measuring the concentration of Suspended Particulate
Matter (SPM) in atmospheric air.