Continuous Particulate Monitoring

Using Light ScatterPhotometers

EPA Designation: None PM2.5 Continuous Particulate Monitor for AQI, Visibility, Remediation, Mobile Monitor Indoor Air Quality Monitor for Workplace, Home Casinos.Principle of Operation: Near Forward Light ScatterCost: Hand Held $3,000. Environmental for Outdoors $5,000.Accessories: Various PM Inlets, Filter and Foam InsertsDownloading: RS232 and Data SoftwareSupport: BGI Offices in Atlanta & Boston. USA DistributorsCalibration Procedure: HEPA Filter –Zero Reference Reference Filter- Span Calibration Dynamic Dust introduced in Lab Gravimetric Filter Comparison in FieldVerification: Flowrate, Zero, Span, Gravimetric Site CalibrationMaintenance: Lenses – Continuous Purge Air, Recal Daily Pump 1year Battery 2 years

Scattered light has components of diffraction, refraction and reflection.

Changes in the particulate reflective properties, shape

and color have an effect on instruments mass response. Gravimetric calibration is necessary to correlate to EPA

PM concentration criteria. Not EPA Designated. Used as a Survey or low cost continuous ambient monitor.

Diffracted

RefractedReflected

Small Detection

Angle

(Optical) Light Scatter Photometer Principle

Light Scattered by angle ß is measured.

IR Light Source

Photo-Detector

Light Traps

ß

SensingVolume

Microdust Photometer Design

Infra RedEmitter (880nm)

Infra RedDetector

Light Stop

FocusingLens

FocusingOptics

Sample Volume

Clean Air Condition. (No Particles)

Infra red beam is focused onto the light trap.

No forward scattering effect.

Zero mass measurement seen by detector.

Zero calibration using a HEPA filter.

Particulate Introduced to Sample Volume

Beam is scattered due to the effects of diffraction, refraction and reflection.

Intensity of Infra red signal is measured by detector and directly proportional to mass.

Particulate

Gravimetric & Respirable Adapters

* Size Selective Inlets

* Poly-Urethane Foam Plug Separators

* Adapter for use with all commercial FRM Samplers

Features

• Full measurement range 0.001 to 2500 mg/m3

• No EPA Approval. User correlated to gravimetric sample.

• Improved optics and zero drift electronics

• DC Battery 30 hour Battery or AC Operated

• Scrolling display/graph of particulate concentration

• 4 user defined calibrations

• Inlets for PM10 PM2.5 PM1 and TSP

•Low cost

•Hand held or Environmental enclosure

Microdust Ambient PM Environmental Enclosure

• Omni Directional Inlet

•Silent Operation

•Portable

•12 Volt DC

•Data Logger

•RS232 and Software

Ambient Continuous Monitor

PM Inlet Flow Controlled Pump Purge Air Microdust Monitor 12 Volt Battery Data Logging Software and Report

Applications

Work place and indoor monitoring. Ambient air quality monitoring for 24 hour continuous

particulate concentration Visibility and AQI Studies Casino Air Quality Ambient Continuous PM Survey and Site Sampler Roadside Monitor Portable DC or Solar Powered Prescribed Burns Emergency Response Remediation Monitor

Model PM950 for Continuous Ambient Monitoring

Auto Zero & Span

Auto Ranging

EPA PM10 FRM Inlet

VSCC Cyclone Inlet for PM2.5

Sample Flow of 16.67aLpm

Rh Controller

47mm FRM Filter

FRM Electronics and Data Logger

PM 950 Continuous Monitor

Summary

Proven continuous monitor technology

Comparable to gravimetric sampling

Detachable probe provides added versatility for

hand-held applications

Wide measurement range with consistent

results

Price and performance competitive

BGI Instruments

Contact us at –

58 Guinan Street

Waltham, MA 02451

Telephone (781) 891-9380

Fax (781) 891-8151

info@bgiusa.com

Web Catalogue www.BGIusa.com