pm10 measmnt

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2/10C ECRD Publications

Measurement of ParticulatePollutants in Ambient Air

Initial approach measured the TotalSuspended Particulate Matter (TSP)

Much of the TSP would not enter thenose or be retained in the upper

respiratory tract. This led to thedevelopment of PM10 samplers.

It is now believed that most of thehealth impacts are related to Fine

Particles that reach deep into the lungsleading to development of Fine Particleor PM2.5 Samplers.



Measurement of ParticulatesFeatures of the Indian

approach Separation of Respirable fraction

through a Cyclone leads to:

a very compact instrument as compared to

the bulky Impactor based systems adoptedby the West.

Recovery of the coarse fraction allowingmeasurement of both TSP & RSP in thesame equipment.

Adoption of Sampling systems insteadof sensor based - direct reading sys:

Keeps costs affordable

Simpler equipment is easier to maintain

Minimal requirement of Calibration &

support infrastructure. Physical sample becomes available for

analysis of constituents

Use of Indigenous equipment ensuresavailability of Service Support



Evolution of the RDS

First developed in 1990-91 Two stage system for separation of

coarse and fine fractions, developed

in collaboration with NEERI.

Envirotech introduced the RDSalmost 4 years before RSPM wasincluded in the Ambient Air QualityStandards in India.

Initially introduced as APM451 andlater upgraded to APM460.

Today Envirotech produces three

variants of the RDS:

APM460BL

APM460NL

APM460NLDX



The Improved RDSEnvirotech APM 460BL

Brushless Blower

Sampling rate does not fluctuatewith variation in mains voltage.

Low equipment downtime andmaintenance costs.

Interference to TVs eliminatedand Audible Noise reduced to

less than half of previous levels. Castor Wheels added

for easier movement of theinstrument in the field.

Small bulb provided for easier

handling at night.



Envirotech APM 460NL

For Research & Intensive use Practically NOISE-LESSoperation

of the APM 460NL makes it ideal formonitoring air quality in residential

areas or near hospitals, libraries etc. Main features of the APM 460NL

Sampling rate does not fluctuatewith variation in mains voltage.

Brushless Blower designed fortrouble free operation even withintensive use.

No interference to TVs.

Low equipment downtime andmaintenance costs.

However the equipment is heavyand frequent re-location should beavoided.



Envirotech APM 460NLDX

Main Features:Flow rate

automaticallycontrolled tocompensate for Dustloading on the filter.

Auto Shut-off if flowrate drops below0.85m3/min.

Only instrument thatconforms to BIS

Low Noise and

Brushless Blower



Monitoring Particulates inAmbient Air - Procedure &

Precautions Preparation

Inspect the filter for pinholes,particles and imperfections. Assignfilter identification numbers.

Establish a system of filter batchnumbers & look-out for fakes.

Equilibrate each filter for at least 24

hrs. in a controlled environmenthaving:

Temperature 15 - 30 degrees C

Humidity 20-45%

Weigh each filter & record the initialweight. For HVS / RDS balance with0.1mg accuracy is required.

For low / medium volume samplers(flow rate




Precautions Operation

Install pre-weighed filter, set thetimer, record Time-totalizer reading

and turn ON the sampler flow.

Allow it to establish normal runningtemperature and record flow rate.

If sampling rate is outside

acceptable limits check for leaks,filter displacement etc.

Record sample information - sitelocation, Sample date, Filter ID No.

On completion of sampling periodrecord flow rate and time-totalizerreading.

Carefully remove the filter - touchonly outer edges, and store in an

appropriate carrier.


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Precautions

Post Operation

Work out the average flow rate.

Record any factors such asmeteorological conditions,construction activity, dust storm etc.that might affect your results.

Transport the filter to the

equilibrating environment as soonas possible.

Equilibrate the filter under the sameconditions for at least 24 hours.

Immediately after equilibrationweigh and record the post sampling

filter weight along with filter ID No.

pm10 measmnt

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