PM Particulate Matter, Dust & Aerosol Analysis

Perma Pure offers a range of Gas Sample Dryers that are designed and used specifically for PM, Dust and Aerosol Analysis. The new MD-700 series was developed with a large diameter Nafion™ tube (0.700″ or 17mm in diameter) to minimize particle losses. The product selection guide is shown below:

PM / Aerosol Sample Drying

  • Large Diameter Nafion™ Tube
  • For Most Flow Rates – 1-17 lpm

Low Flow Aerosol Sample Drying

  • Standard Diameter Nafion™ Tube
  • Low Flow Rates – below 1 lpm

High Flow Aerosol Sample Drying

  • Multiple Nafion™ Tubes
  • High Flow Rates – 10-40 lpm
selector-md selector-md selector-pd

MD-700 Large Diameter Nafion™ Dryer Series – Developed Specifically for Aerosol Analysis

The MD-700 Dryer for Aerosol Analysis was developed at the request of our customers specifically for PM particle measurement and aerosol analysis. In order to minimize particle losses, a laminar sample flow is maintained through the flow path of the dryer using special large diameter 17mm (0.700”) Nafion™ tubing. Some basic features of the dryer are listed below:

  • Eliminates the need for heating the sample gas stream, preserving the volitle particulate component in the sample
  • Grounded Stainless Steel Tube and Shell Construction eliminates buildup of static electricity and provides long service life outdoors.
  • Straight Configuration in 6, 12, 24, and 48 versions minimize turbulent flow that can negatively affect measurements
  • Dryer is continuously regenerating, eliminating the need to repeatedly replace desiccant
  • Designed to be used with the vacuum reflux purge gas method where no dry or instrument air is available.

Note: A dry purge gas source is required to remove the moisture – see Purge Gas Configurations for options.

MD Dryer Series – Construction Options for Low Flow Aerosol Analysis

The MD (Monotube Dryer) Series transfers moisture from one gas stream to a counter-flowing dry purge gas stream, much like a shell-and-tube heat exchanger transfers heat, using one Nafion™ tube. This option can be used for low flow applications under 1 lpm as the flow remains linear.  A wide range of lengths and tube diameters is available to cover the sample gas flow ranges shown below. Note: A dry purge gas source is required to remove the moisture – see Purge Gas Configurations for options.

Recommended Sample Gas Flow Rates: 0-1 lpm: MD-110 Series

PM / Aerosol Analysis Special Construction Requirements:

  • 0.110″ Tubing Version for best flow characteristics
  • Grounded Stainless Steel Tube and Shell Construction eliminates buildup of static electricity and provides long service life outdoors.
  • Straight Configuration in 12, 24, 48 and 72 inch versions minimize turbulent flow that can negatively affect measurements

PD Dryer Series – Construction Options for High Flow Aerosol Analysis

The PD (Polytube Dryer) Series transfers moisture from one gas stream to a counter-flowing dry purge gas stream, much like a shell-and-tube heat exchanger transfers heat, using multiple Nafion™ tubes. These are chosen when the MD dryers do not offer the flow capacity required. A wide range of lengths and tube diameters is available to cover the sample gas flow ranges shown below. Note: A dry purge gas source is required to remove the moisture – see Purge Gas Configurations for options.

Recommended Sample Gas Flow Rates: 1-20 lpm: PD Series listed below

PM / Aerosol Analysis Special Construction Requirements:

  • PD-07018T version with larger tubes than standard PD Dryers specially developed for PM/Aerosol Monitoring offer the best flow characteristics while minimizing particle losses
  • Grounded Stainless Steel Tube and Shell Construction eliminates buildup of static electricity and provides long service life outdoors.
  • Configurations in 12 ad 24 inch versions minimize turbulent flow that can negatively affect measurements

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