IOM Plastic Inhalable Sampler and Cassette

A Gold Standard for Personal Inhalable PM Sampling

The patented* IOM Sampler, developed by J. H. Vincent and D. Mark at the Institute of Occupational Medicine (IOM) in Scotland, meets the ACGIH sampling criteria for inhalable particulate mass. 
The IOM Personal Inhalable Sampler is a conductive plastic sampling head that houses a reusable 25-mm filter cassette with specified filter for the collection of inhalable airborne particles. When attached to a personal sampling pump operating at 2 L/min and clipped near a worker’s breathing zone, the IOM effectively traps particles up to 100 µm in aerodynamic diameter and closely simulates how airborne workplace particles are inhaled through the nose and mouth. 
Because both the cassette and the filter are pre and post-weighed as a single unit, all particles collected (even larger ones) are included in the analysis. The cassette can be cleaned, reloaded with a new filter, and reused.
* U.S. Patent No. 4,675,034

For more information on the IOM Plastic Sampler and Cassette, contact your local Air-Met office. 

Meets U.S. and international standards 

  • ACGIH sampling criteria for inhalable particulate 
  • ISO/CEN health-related fraction of bioaerosols 
  • Preferred sampler for HSE Method MDHS 14/3 
  • NIOSH Method 5700 for particulate formaldehyde 
  • Australian standard for inhalable particulate 
  • Complies with MDHS 25/3 for organic isocyanates (stainless steel model) 
  • Complies with MDHS 6/3 for lead (with single-hole head accessory) 
  • OSHA equivalent method for particulates not otherwise regulated (PNOR)

Economical and reusable

Small and lightweight 

  • Plastic model weighs less than 2 ounces (55 grams) 
  • Ideal for sampling vapour-phase isocyanates

Efficient particulate sampling up to 100 µm

Maintains sample integrity 

  • Removable 25-mm cassette system eliminates filter handling 
  • Cassette and filter are weighed as a single unit to include all collected particles in analysis

Stainless steel cassettes available for chemical analysis 

  • Autoclavable for bioaerosol sampling
Flow Rate
2 L/min (personal sampling) 
50% Cut-point
100 µm at 2 L/min inhalable fraction
4.0 µm at 2 L/min respirable (with multiDust) 
Material Moulded autoclavable conductive plastic (polypropylene) or stainless steel
Maximum Operating Temperature 
Plastic IOM and cassette: 212°F (100°C) with no pressure †
Stainless steel IOM and cassette: 392°F (200°C) suitable for autoclaving and solvent washing
Filters 25-mm membrane or fibrous filter
Tubing 1/4-inch ID
Weight (plastic model with cassette) 
< 2 oz (55 gm) 
Dimensions 3.3 x 1.1 in (8.5 x 2.8 cm) 
Analysis Gravimetric or chemical (stainless steel model)

† The plastic IOM is not suitable for autoclaving or ethylene oxide sterilization. 

  • For collection of inhalable particles