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Microdust ProTM - Aerosol Photometer
Portable Real-Time Aerosol Monitor, Data Logger

 

 

Microdust Pro
Microdust ProTM

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Microdust Pro Display
Microdust ProTM Display

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Microdust Pro Software
Microdust ProTM Software

 

 

 

 

 

 

Gravimetric Cyclone Adapter
Gravimetric Cyclone Adapter
(P/N 2472)

 

 

 

 

 

 

 

Gravimetric Cyclone Adapter (P/N 2472) shown with a BGI 4CP Cyclone, mounted to a Gravimetric Dust Adapter (P/N 103214B)
Gravimetric Cyclone Adapter
(P/N 2472)
shown with a BGI 4CP Cyclone, mounted to a Gravimetric Dust Adapter
(P/N 103214B)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Microdust Environmental Enclosure
Microdust Environmental Enclosure

 

 

Microdust Pro EPA adaptor
Microdust ProTM EPA adaptor
Block for FRM Samplers

 

Adaptor and Microdust Pro
Adaptor and Microdust ProTM
Shown installed on Sampler

Download the latest version of the instruction manual. Click here and then click on manual # 33.
Download the self-extracting Windust Pro Software
Download the FAQ in Adobe Acrobat format

Applications

  • Real-time measurement of airborne particulate concentration
  • IAQ Monitoring
  • Industrial Hygiene factory monitoring for particulates
  • "Walk through" surveys
  • Specialist size selective monitoring (PM2.5 and PM10, respirable and thoracic)
  • Filter test and aerosol research

Features

  • Affordably priced
  • Hand held and portable
  • Wide range (1 microgram/m3 to 2500 mg/m3)
  • Internal data logger
  • Graphical on-screen display
  • Versatile software included
  • Built-in calibration for zero and span
  • Option of user defined calibration
  • Option of rechargeable (10 hr) or alkaline (20 hr) batteries
  • Size specific inlets (TSP, PM10, PM2.5 and respirable)

 

The Microdust ProTM is the latest development in the science of photometric measurement of suspended particulate concentrations. While instruments of this type have been available since the 1960's, this latest development from Casella Ltd. of Bedford, U.K. represents a step-function advance over all competitive offerings.

Operation

The Microdust ProTM measures particulate concentrations using a near forward angle light scattering technique. Infrared light of 880 nm wavelength is projected through the sampling volume where contact with particles causes the light to scatter. The amount of scatter is proportional to the mass concentration and is measured by the photo detector. By using a narrow angle of scatter (12-20 degrees) the majority of light scattered is in the diffracted and refracted components, which minimizes the uncertainty associated with particle color, shape, and refractive index.

Concentration Range

The Microdust ProTM has the advantage that there is only one model which covers the entire measurement range (0 to 2500 mg/m3). It is possible to "fix" the range of the instrument, or have it as an "auto-ranging" device.

Display

The Microdust ProTM incorporates a 128 x 64 pixel graphical backlit display. Dust concentrations are presented in two unique ways:
Graphical representation - the Microdust Pro is the first real time particle measuring instrument to have a scrolling graph of dust concentrations. The graph is able to show a continuous trace over a number of time-bases. These may be set on the X-axis at 100 seconds, 200 seconds, 15 minutes and 1 hour. The Y-axis range may be auto-ranging or fixed.

Numerical values - instantaneous concentrations are displayed, as well as values for the Time Weighted Average (TWA) and maximum concentrations. These values can be reset at any time by a "one button" reset.

Cyclone Size Selective Sampling

Because BGI has become a leader in the development and production of size selective sampling cyclones, we have produced an adapter which will permit the use of the full range of our products with the Microdust ProTM. The adapter, known as the Gravimetric Cyclone Adapter (P/N 2472) is utilized in conjunction with the Microdust ProTM Gravimetric Dust Adapter (P/N 103214B), as shown in the accompanying images. Utilizing this adapter will permit the instantaneous reading of the widest possible range of size cuts and/or logging of the data over any time period. The ability to collect all of the sampled dust onto 25 or 37 mm cassettes allows the investigator to fine tune the instrument for specific kinds of dusts. This size selective ability, along with the Pro's logging capability, makes it the first instrument of choice for "First Response" situations.

All combinations of BGI Cyclones, usable with the adapter, are shown in the accompanying table. The requisite sampling pumps can be user supplied, or are available from BGI (AFC123 or BGI 400).

Table of BGI Cyclones
(Click on description to go to product page)
Description
D50 Cut (µm)
Popular designator
Flow rate (Lpm)
BGI 4L 4 Respirable 2.2
BGI 4CP 4 Respirable 2.2
GK 2.05 2.5 PM 2.5 4
GK 2.05SH 2.5 PM 2.5 3.5
GK 2.69 1.6 PM10/Thoracic 1.6
  4 Respirable 4.2
Triplex 4 Respirable 2.2
  2.5 PM 2.5 1.5
  1 PM 1.0 3.5


(Note: The obsolete BGI 4 cyclone is identical to the BGI 4L. The GK 2.05 cyclone is also known as the "KTL")

Calibration

Each Microdust ProTM is individually factory calibrated using a gravimetric technique. The instrument can be returned to the 'factory' calibration setting, at any time during its life, by the use of a non degradable calibration insert (supplied).

An individual gravimetric calibration is also possible. This involves the collection of a gravimetric (filtered) sample of the dust after it has passed through the probe optics. In this way, two averages are collected over the exposure period. One is from the filter, whilst the other is provided by the averaging function within the instrument. It is then possible to derive the difference in these two figures and correct accordingly.

Additionally, it is possible to store 4 different calibration values within the instrument and select these according to the situation. All these procedures are accessible through the easy menu structure.

Software

The WinDustProTM software offers the user the ability to perform the following functions:

  • Create a "profile" for the instrument (logging interval, parameters and "identifier" for multiple instruments). Transfers control profile from the PC to the instrument.
  • Recover data from the instrument
  • Production of line graphs based upon historical data
  • Tabular and report presentation of data files
  • Real time presentation of prevailing conditions via the RS232 connection

Data-logging

The Microdust ProTM features an internal logger which can store up to 15,700 data points over 32 separate runs. The logging interval can be set from 2 seconds to 10 minutes. At 2 seconds, it is possible to record 8.75 hours of data; at 5 minutes, this equates to a total logging time of 50 days. Recorded values include:

  • Average concentration over the logging period (mg/m3)
  • Maximum concentration over the logging period (mg/m3)
  • Date and time stamp

Operation:

Sensing Technique Near forward light scattering - 880 nm infrared
Ranges All instruments provide 0 to 2500 mg/m3 over four ranges as standard
Resolution 0.001 mg/m3 (1 ug/m3)
Operating temp range 0 to 50 C (non condensing)
Storage temp range -20 to +55 C
Calibration Gravimetric method using 'Arizona Fine' calibration dust (ISO12103-1,A2)
Zero stability +/- 0.002 mg/m3/C
Span stability < 0.7% FSD/C

 

Power:

Battery 4 x AA / MN1500 cells - Alkaline or rechargeable NiCd
Operating duration Alkaline (2700mAh) typ. > 20 hrs
NiCd cells (950mAh) typ. > 10 hrs
Battery charging Internal NiCd fast charger circuitry (with time-out protection)
Charge rate Fast charge rate 450mA, Standby charge rate 55mA
Power adapter Universal input voltage range 100-250VAC, 47-63Hz
Output 12VDC @ 0.8A

General:

Analogue Output 0 to 2.5Vdc FSD, 500 ohm output impedance (3 ms update rate)
Keypad 7 key tactile membrane
Weight Instrument only: 0.97 kg (2 lbs) (complete kit with flight case: 4.5 kg (10 lbs))
Dimensions Probe: 35 mm dia x 290 mm (1.4 x 11.4 in) total length
Instrument H x W x D: 245 x 95 x 50 mm (9.6 x 3.7 x 2 in.)
Flight case H x W x D: 135 x 490 x 370 mm (5.3 x 19 x 14.5 in)
Maintenance Factory cleaning required annually depending on measurement conditions

Display:

Display 128 x 64 pixel LCD graphics panel with backlight
Displayed values:
Instantaneous reading:
 Rolling average concentration over a user selectable period (1 to 60 seconds)
Time weighted average:
 Average concentration since power on or reset
Maximum value:
 Maximum concentration since power on or reset
Scrolling graphs 100/200 seconds, 15 minutes or 60 minutes (Y axis autoranging or fixed)
Battery voltage Battery voltage with 'OK'/'Low' status message

Calibration:

Factory calibration Traceable isokinetic technique (wind tunnel) and ISO 12103-1
User calibration Four user defined calibration settings available
Routine calibration Software calibration for zero and span setting
Optical calibration filter supplied (restores factory calibration)

Data Logging:

Internal memory 64K EEPROM providing 15,700 data points
Logging interval Adjustable from 2 to 600 seconds
Recorded values Average concentration over logging period
Individual, average and max/min concentrations over logging period
Serial interface RS232 up to 38.4K baud

Software:

WinDustPro provides a friendly graphical interface for instrument configuration, data download and graphical report presentation
Operating system MicrosoftTM Windows 95, 98, NT, XP(16 or 32 bit)
Requirements IBM compatible PC with RS232 serial port, 8MB RAM, FDD, HDD, VGA colour graphics

Microdust Environmental Enclosure

The Microdust Environmental Enclosure accessory to the Microdust ProTM is designed to monitor aerosol or dust concentrations in either indoor environments where security is an issue, or in ambient conditions. Using the enclosure, it is possible to monitor a range of particle sizes (including PM10, PM2.5, respirable or TSP) for up to 24 hours. A filter collects all the sampled dust for gravimetric or chemical analysis and a "retrospective calibration" can be applied to the instrument.

EPA Related Sampling

All EPA PM2.5 Reference Samplers and their direct PM10 derivatives are equipped with a socket and tennon whose dimensions and tolerances are defined by EPA. Additionally, most manufacturers of continuous monitoring equipment have adhered to the same standard dimensions. This fortuitous commonality makes it a simple and practical matter to apply the continuous data logging capabilities of the Microdust Pro to short term, intense monitoring studies such as would be associated with events of critical interest. Some examples would be fires, accidental or purposeful releases of aerosols. Utilization of the FRMADP adaptor will permit the proven, precise sampling ability of an EPA FRM sampler to be enhanced by the real time data logging abilities of the Microdust Pro.

Ordering Information
Click on a part number to add that item to your Price Quote List.
176000A Microdust Pro kit in carry case - includes calibration insert, clean air bellow, rechargeable batteries (4), power supply, 32 bit software & RS232 comms cable
Accessories
Click on a part number to add that item to your Price Quote List.
176093A Environmental Enclosure - includes battery, chamber, pump and inlet
103214B Gravimetric dust adapter
2472 Gravimetric cyclone adapter
103182B Respirable dust adapter
151280B Size selective adapter
FRMADP FRM Adapter for all EPA std. fittings
CIS3F Foam inserts for (PM)2.5, pkg. of 50
CIS4F Foam inserts for (PM)10, pkg. of 50
CIS5F Foam inserts for respirable
Copyright © 2006 by BGI / Modified: Thursday, January 3, 2008

 

 

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