GS-3 Conductive Plastic Respirable Dust Cyclone, 37 mm

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Part Number: 225-100
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GS-3 Conductive Plastic Respirable Dust Cyclone, 37 mm Overview

GS-3 Respirable Dust Cyclone, 10 mm, with 37-mm cassette adapter, conductive plastic construction

The GS-3 Respirable Cyclone is operated at 2.75 L/min to conform to the ISO 7708/CEN criteria specified in the 2016 OSHA rule on respirable crystalline silica. The SKC GS-3 Cyclone’s multiple tangentially arranged inlets eliminate ambient wind speed and orientation sensitivity and decrease particle loss due to impaction. Lightweight conductive plastic construction eliminates electrostatic effects. The GS-3 Cyclone is used with a standard three-piece filter cassette.


Performance Profile

Sample Time Varies
Sample Rate 2.75 L/min for 4-µm 50% cut-point * (OSHA silica rule)
Sample Pump Universal or AirChek series
Sample Media 25 or 37-mm filters in 3-piece cassettes
Tubing 1/4-in ID
* Calibrated at U.K. Health and Safety Laboratory


  • Sampler Class : Respirable
  • Cut-point : 4 μm
  • Flow rate : 2.75 L/min
  • Disposable : No
  • Sampler Type : Cyclone
  • Calibration Adaptor? : No

GS-3 Respirable Dust Cyclone
Meets ISO 7708/CEN Criteria

GS Cyclone Train on Worker and Cyclone closeup

GS-3 Cyclone Cat. No. 225-100

GS-3 Cyclone’s Unique Design

    • Conductive plastic construction eliminates static collection problems with charged particles.

  • Multiple inlets eliminate sensitivity to wind velocity and user orientation to the contaminant source.

The Multiple-inlet GS-3 Cyclone
The GS-3 Cyclone is a 10-mm lightweight conductive plastic sampler used with a standard three-piece cassette with filter for the collection of respirable dust particles. The GS-3 Cyclone’s removable cassette adapter securely holds the filter cassette in place during sampling. Designed to conform to ISO 7708:1995/CEN particle size-selection criteria, the GS-3 Cyclone has a 50% cut-point of 4 µm (bias within ISO/OSHA/NIOSH requirements) at 2.75 L/min (Calibrated at U.K. Health and Safety Laboratory).

OSHA Publishes Final Rule on Respirable Crystalline Silica
In its final silica rule, OSHA sets a new permissible exposure limit (PEL) of 50 µg/m3 across all industries covered by the rule and abandoned the previous silica PEL formula. In addition, the OSHA final silica rule states that any sampler conforming to the ISO 7708/CEN criteria (50% cut-point of 4 µm) can be used for workplace silica. The ISO 7708 criteria have been adopted by NIOSH, ACGIH, and many other global occupational hygiene organizations. SKC GS-3 Cyclone performance data, relative to the ISO 7708/CEN standard, was published in the Journal of Aerosol Science, 28, 1997.

Traditionally, respirable dust sampling with a cyclone has been performed using a clear styrene cassette. NIOSH now suggests that conductive black polypropylene cassettes are a better option for this application to minimize cassette wall losses.

Graph: Average Sampling Efficiency GS-3 Cyclone at 2.75 L/min

Collection efficiency relative to ISO 7708 standard in OSHA final silica rule and ACGIH TLVs
(click to enlarge)

GS-3 Cyclone Superior Performance
With low mean bias and higher flow rate requirements, the GS-3 Cyclone provides better sampling accuracy when compared to the performance of other cyclones used for respirable dust collection. Furthermore, the multiple-inlet GS-3 Cyclone overcomes sampling problems that have been reported with the single-inlet 10-mm nylon cyclone.

Kar, K. and Gautam, M., "Orientation Bias of the Isolated 10 mm Nylon Cyclone at Low Stream Velocity," AIHA Journal, Vol. 56 (1995), pp. 1090-1098

Gautam, M. and Sreenath, A., "Performance of a Respirable Multi-inlet Cyclone," Journal of Aerosol Science (U.K.), Vol. 28, No. 7 (1997), pp. 1265-1281

Trakumas, S., et al., Performance Assessment of Personal Respirable Cyclone Samplers, AIHce Presentation 191, 2003, (PowerPoint presentation)

OSHA Final Rule on Respirable Crystalline Silica,

Contact SKC Technical Support for reprints.

SKC Limited Warranty and Return Policy
SKC products are subject to the SKC Limited Warranty and Return Policy, which provides SKC’s sole liability and the buyer’s exclusive remedy. To view the complete SKC Limited Warranty and Return Policy, go to the SKC Limited Warranty for Products and Return Policy page.