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Mark III Eight Stage Cascade Impactor

Product SKU: NS-60

Quick Overview

A multi-stage, multi-jet impactor for stack particulate effluents in moderate grain loading applications. Andersen's impactor is made of stainless steel with Inconel O-rings and is able to withstand temperatures of 1500° F, if used without special collection substrate and back-up filter. If your application requires a substrate filter, the impactor will only withstand temperatures up to approximately 800° F. The gooseneck inlet nozzle and internal high capacity preimpactor fit through a minimum 3" port.

Availability: In stock



The Mark III Impactor measures the size distribution of in-stack particulate emissions in addition to total particulate mass concentration.

The Mark III is an in-stack, multi-stage, multi-jet cascade impactor which adapts to commercially available stack sampling systems containing an “EPA-type” probe. This impactor aerodynamically and automatically classifies particles into multiple size ranges and accounts for all their physical properties including size, shape, and density. 

Aerodynamically fractionating particles in the stack is important in determining particle behavior after leaving the stack, area of environmental deposition, probable point of respiratory deposition, type of control equipment needed to collect the particles, collection efficiency of existing control equipment and compliance with state and federal regulations.


The In-Stack Impactor consists of a stainless steel housing with nine jet plates separated by stainless steel spacer rings. Special collection substrates (glass fiber, quartz fiber, aluminum foil, etc.) and a final back-up filter are placed on the jet / collection plates to permit lighter tare weights for gravimetric analysis and a variety of collection materials for chemical analysis. 

An optional stainless steel preseparator (either impaction chamber or right-angle) is designed to fit directly into the front end of the impactor and should be used whenever sampling in stacks with particles larger than 10-microns. 

The Mark III is designed to operate at 0.75 ACFM or less. An optimum flow rate is approximately 0.5 ACFM. Normal sampling periods vary from a few minutes to several hours in heavy and light grain loading situations respectively. Ten milligrams of particulate matter on any one plate represents an approximate upper limit of collection. 

Whenever a sample has been collected, the particle sizing has already been completed. To determine the nature of the size distribution, simply perform the required gravimetric and / or chemical analysis.


Fractionates and collects stack particles into ten aerodynamic size ranges

Additional Information


Cut-Points >10μm in optional preseparator and <0.4μm on standard backup filter holder
Maximum Stack Temperature Stainless steel case, plates, holder & spacers permit use up to 1500°F (815°C)
Precision 99.5%
Maximum Stack Concentration Up to 1 grain/SCF; optional preseparator permits sampling in higher grain loadings
Flow Rate 0.1 to 0.75 ACFM; optimum flow rate is ~ 0.5 ACFM
Dimensions 10" (254mm) maximum length (including nozzle) x 2.8" (71mm) diameter