98 www.skcltd.com SKC Ltd. Phone: +44 (0)1258 480188

Particulate SamplingSize-selective Samplers

IAQA Respirable Particulate IAQA Respirable Particulate

Indoor Air Guideline: 50 μg/m3

Tech Tips

Personal Environmental MonitorFor Measurement of PM10 and PM2.5 in Indoor Air

Th e Personal Environmental Monitor (PEM) is a small, lightweight impaction device used with a personal sample pump to provide eff ective sampling of PM10 and PM2.5 in indoor air. Personal exposure is determined through gravimetric analysis for particle mass and chemical analysis for specifi c compounds.

How the PEM WorksTh e PEM consists of three major parts: cap, impaction ring assembly, and base with after-fi lter. When used with a personal sampling pump at the required fl ow rate, aerosol is accelerated through a number of nozzles in the cap. Th rough inertia, particles larger than the 50% cut-point of the sampler impact onto a greased impaction ring and can be discarded after sampling. Particles smaller than the 50% cut-point pass through the impactor and collect on a 37-mm after-fi lter. Th ere are six models of PEM available for the collection of PM10 or PM2.5 at three diff erent fl ow rates.

Referenced in EPA Method IP-10A• For particles in indoor air

Small and unobtrusive• Can be connected to a personal sample

pump and worn in the breathing zone

Suitable for ACGIH thoracic TLVs• Including sulfuric acid and cotton dust as

thoracic particulate matter with 10-μm PEM

* Back pressure on PTFE filters can vary within the same lot.

PEM ApplicationsUse the PEM for air pollution stud-ies, indoor air quality assessments, and personal sampling for indus-trial hygiene applications (not an EPA reference method for ambient air). Th e PEM is referenced in EPA IP-10A and the SKC EPA IP-10A Method Update. Visit www.skcinc.com/instructions/IP10A.pdf.

Pumps for sampling with the PEM

• 2 or 4 L/min fl ow rates, see pages 8-19

• 10 L/min fl ow rate and 24-hour sampling, see pages 22-23

Sample Time: VariesSample Rate: 2, 4, or 10 L/minSample Pump: Universal, AirChek 2000/3000, or

Leland Legacy Sample Media: 37-mm PTFE fi lters*Tubing: 3/16-inch ID

Cut-point Model Flow Rate Cat. No.2.5 μm 2 L/min 761-203

4 L/min 761-203A

10 L/min 761-203B

10 μm 2 L/min 761-200

4 L/min 761-200A

10 L/min 761-200B

AccessoriesPEM Calibration Cap 761-202After-fi lter, 37-mm, 2.0-μm PTFE* with PMP support ring, pk/50 225-1709

99SKC Inc. Phone: +1-724-941-9701 www.skcinc.com

Particulate SamplingSize-selective Samplers

Personal Modular Impactor (PMI)Highly Effi cient Personal PM10, PM2.5, or PM Coarse Sampling

Models available for PM10, PM2.5, or PM Coarse (10-2.5) sampling

Use with any constant flow pump at 3 L/min

Compact and lightweight — only 71 grams (2.5 ounces)!• Ideal for personal or micro-environmental sampling

Closely follows PM2.5 or PM10 as defined by EPA (see right)

Convenient modular design for easy operation• Removable filter cassette for easy media changes• Disposable ready-to-use pre-oiled impaction discs

reduce particle bounce for high collection efficiency — no cleaning or greasing

• Convenient clip for mounting sampler in the breathing zone

PMI PM10 model is easily converted with accessory ring to measure PM Coarse

PMI PM10 model is suitable for ACGIHthoracic TLVs• Including sulfuric acid and cotton dust as

thoracic particulate matter

Th e patented* SKC single-stage Personal Modular Impactors (PMIs) are designed for the highly effi cient collection of PM10, PM2.5, or PM Coarse (10-2.5). Th e samplers are easy to use with a removable fi lter cassette and pre-oiled impaction disc. Th e 25-mm pre-oiled impaction disc mounts directly on top of the fi lter cassette and reduces particle bounce for high collection effi ciency. A 25-mm fi lter may be used as an alternate impaction substrate for optional chemical analysis of particles. Th e PMI Coarse model includes a second fi lter cassette to allow collection of particles < 10 μm, but larger than 2.5 μm.

* U.S. Patent No. 7,334,453 † Back pressure on PTFE filters can vary within the same lot.‡ A 25-mm filter may be used as an alternative impaction substrate for chemical analysis.

PMI Sampler Cat. No. Qty.Personal Modular Impactor (PMI) includes impactor and filter cassette with support screen, requires collection media and impaction substrate sold separately; see below PM2.5 (gold) PM10 (silver) PM Coarse includes 2 filter cassettes and filter retainer

225-352225-350225-351

eaeaea

Recommended Collection FiltersQuartz Filters, 37 mm, Tissuquartz, 432 μm thick 225-1822 25PTFE Filters,† 37 mm, 2.0-μm pore size, with PMP support ring 225-1709 50PTFE Filters,† 37 mm, 1.0-μm pore size, with laminated PTFE support 225-2705 50Recommended Impaction Substrate, required for sampling. Limited shelf-lifePre-oiled Porous Plastic Discs,‡ 25 mm, ready to use, disposable 225-355

225-355A2550

AccessoriesPM Coarse Ring includes filter cassette, adapts a PMI 10 to a PMI Coarse 225-3512 eaReplacement Filter Cassette 225-356 eaPMI Cassette Opener 225-357 eaForceps, stainless steel, non-serrated flat tips, see p. 88 225-8371 eaFilter-Keepers, 37 mm, for filter transport, see p. 89 225-8303

225-8303A10010

PMI Calibration Adapter 225-358 eaFilter Retainer, secures filter in impaction substrate position on top of cassette 225-354 ea

A B O U TPMI PerformanceThe graph below demonstrates the high sampling efficiency of the PMI PM2.5 and PM10 Samplers when compared to the EPA PM2.5 and PM10 criteria curves. For more information, see the Modular Impactor Poster Presentation at www.skcinc.com/instructions/Modular_Impactors_Poster.pdf.

DataInterpretation Particulates as PM10

LEED Green Buildings Indoor Air Maximum Concentration: 50 μg/m3

Source: LEED for New Construction Rating System v.3 (U.S. Green Building Council, http://www.usgbc.org)

Sample Time: VariesSample Rate: 3 L/minSample Pump: Universal or AirChek 2000/3000 Sample Media: 37-mm fi lter (requires impaction substrate)Tubing: 1/4-inch ID

For PM size-selective sampling at

10 L/min, see the IMPACT Sampler

on page 101