About SKC Terms of Use Privacy Policy Careers
© Copyright 2020 SKC Inc. ISO-9001
TrainingMy AccountMy FavoritesCart
  Home » Catalog » Particulate Samplers » Size-selective Samplers » Inhalable Samplers » IOM Sampler

IOM Sampler

Orderable Items Choose the original IOM Inhalable Sampler for optimal performance! The IOM is a gold standard sampler in the industry and features a convenient removable filter cassette that is weighed before and after sampling as a single unit for gravimetric analysis. IOM meets several U.S. and international standards for inhalable particulate and bioaerosols. Use IOM with a personal sample pump at 2 L/min. IOM is also available in an autoclavable stainless steel version for chemical analysis and bioaerosol sampling. When used with MultiDust Foam Discs, IOM can sample respirable and inhalable particulate simultaneously.


  • 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 14/4
    • NIOSH Method 5700 for particulate formaldehyde
    • Australian standard for inhalable particulate
    • Complies with MDHS 25/3 for organic isocyanates (stainless steel model only)
    • Complies with MDHS 6/3 for lead (with single-hole head accessory)
    • OSHA-equivalent method for particulates not otherwise regulated (PNOR)
      Reference: OSHA letter November 8, 2011

  • Economical and reusable

  • Small and lightweight
    • Plastic model weighs less than 2 ounces (55 grams)
    • Ideal for sampling vapor-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

  • Use with MultiDust Foam Discs for simultaneous inhalable and respirable dust
    • Determine respirable dust only by weighing the filter only




Performance Profile
Flow Rate 2 L/min* (personal sampling)
50% Cut-point 100 µm at 2 L/min inhalable fraction
4 µm at 2 L/min respirable (with MultiDust)
Material Molded 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
(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)

* For Sampling at higher flow rates see Technical Note: Higher Flow Rates Expand Applications for The IOM Sampler (PDF)

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




IOM Sampler Cat. No. 225-70 Attached to Worker

IOM Sampler
The 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 weighed as a single unit before and after sampling, all particles collected (even larger ones) are included in the analysis. The cassette can be cleaned, reloaded with a new filter, and reused.

Conductive plastic IOM Sampler and cassette - Cat. No. 225-70A

Configuration for conductive plastic IOM Sampler and cassette - Cat. No. 225-70A and plastic IOM with stainless steel cassette - Cat. No. 225-79A

Stainless steel IOM Sampler and cassette - Cat. No. 225-76A
Configuration for stainless steel IOM Sampler and cassette - Cat. No. 225-76A



Particle Size-selective Dust Sampling
The hazard potential of airborne dust, solid particles, or droplets is dependent on the mass concentration as well as the particle size. Particle size determines the deposition site within the respiratory tract and the subsequent health effect. Therefore, the American Conference of Governmental Industrial Hygienists (ACGIH®) has recommended that particle-size selective Threshold Limit Values (TLV®s) be developed for inhalation hazards in the workplace.

Particle-size selective TLVs consider two points:
  1. The size-fraction most closely associated with the specific health effect
  2. The mass concentration within that size fraction which should represent the TLV
The ACGIH recommends that particle-size selective TLVs be expressed in three forms:

ACGIH recommends that particle-size figure
Inhalable Particulate Mass
Dust particles having a 50% cut-point of 100 µm. These dust particles are hazardous when deposited anywhere in the respiratory tract.

Thoracic Particulate Mass
Dust particles having a 50% cut-point of 10 µm. These dust particles are hazardous when deposited anywhere in the lung airways and gas-exchange regions.

Respirable Particulate Mass
Dust particles having a 50% cut-point of 4 µm. These dust particles are hazardous when deposited anywhere in the gas-exchange regions.

Since inhalable particulate mass is defined as those materials that are hazardous when deposited anywhere in the respiratory tract, including the nose and mouth, a sampler designed for the collection of inhalable dust should have a median cut-point of 100 µm.


Mark, D. and Vincent, J. H., "A New Personal Sampler for Airborne Total Dust in Workplaces," Ann. Occup. Hyg. Vol. 30,1986, pp. 89-102

ACGIH Technical Committee on Air Sampling Procedures: Particle Size-selective Sampling in the Workplace, ACGIH, Cincinnati, Ohio, 1984

Kenny, L.C., Bowry, A., Crook, B., and Stancliffe, J.D., “Field Testing of a Personal Size-selective Bioaerosol Sampler,” American Occupational Hygiene, Vol. 43, No. 6, 1999, pp. 393-404

Kenny, L.C., Stancliffe, J.D., Crook, B., Staff S., Griffiths, W.D., Stewart, I.W., and Futter, S.J., “The Adaptation of Existing Personal Inhalable Aerosol Samplers for Bioaerosol Sampling,” American Industrial Hygiene Association Journal, Vol. 59, 1998, pp. 831-841

Kenny, L.C., Chung, K.Y.K., and Dilworth, M., “Applications of Low-cost Multifraction Aerosol Samplers - Final Report,” IR/EXM/99/06, Health and Safety Laboratory, U.K., 1999

Kenny, L.C., Chung, K.Y.K., Dilworth, M., Hammond, C., Jones, J. Wynn, Shreeve, Z., and Winton, J., “Applications of Low-cost Dual-fraction Dust Samplers,” Ann. Occup. Hyg., Vol. 45, No. 1, 2001, pp. 35-42

Wang, C., et al., “Field Evaluation of Personal Sampling methods for Multiple Bioaerosols,” doi:10.1371/journal.pone.0120308