Specifications and Product Details:

Manufacturer's Link http://www.casellausa.com/store/product.cfm?pID=7C504B4241127951

Casella Microdust pro Particulate Monitor

Introduction

The Microdust Pro from CasellaUSA is a portable, real time monitor for assessing the concentration of suspended particulate matter, and is probably the most versatile instrument available with the ability to measure from 1µgm^-3to 2500 mgm^-3. It is the only handheld real-time dust monitor on the market capable of graphically presenting variations in dust concentration on a real time scrolling graph - no longer is it necessary to wait to analyze results on a PC.

Applications

Occupational health & safety monitoring
Walk through surveys
Site boundary monitoring &environmental measurement
Industrial process monitoring
Testing respiratory equipment or air filtration efficiency
Research activities

Operation and use

The Microdust Pro measures particulate concentrations using a near forward angle light scattering technique. Infrared light of 880nm 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°) the majority of light scattered is in the diffracted and refracted components, which minimizes the uncertainty associated with particle color,shape and refractive index.

Each Microdust Pro is individually factory calibrated, using a gravimetric technique. The instrument can be returned to this "factory" calibration setting at any time during its life by the use of a non-degradable calibration insert (supplied with every unit). An individual gravimetric calibration is also possible. This involves the real time scrolling display of concentration levels with user selectable time bases and auto ranging y-axis scale simultaneous collection of agravimetric (filtered) sample of the dust. 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.

The Microdust Pro features an internal logger that can store upto 15,700 data points over 32 separate runs. The logging interval can be set from 2 seconds to 10 minutes. At 2seconds, 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: