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Isokinetic Sampling

Apex Instruments Inc. offers a wide array of equipment and supplies for sampling stationary source emissions for pollutants in accordance with US EPA Reference Methods. Most of the methods are generally classified as either Isokinetic or Gaseous Sampling Methods. This section includes Apex Instrument Isokinetic equipment and accessories. This type of sampling requires the sample to be drawn from the gas stream at the same rate it is moving through the stack or duct.

Isokinetic Source Sampling Methods

Apex Isokinetic Source Sampler systems let the operator monitor gas velocities, temperatures, pressures and sample flow rates for maintaining isokinetic sampling conditions. The Source Sampler system is easily adapted to test for a wide range of pollutants from stationary sources, such as dust including particle size distributions, metals, polychlorinated biphenyls (PCBs), dioxins/ furans, polycyclic aromatic hydrocarbons (PAHs) and an ever increasing group of pollutants tested for with adaptations of this basic isokinetic test method.

Our Isokinetic equipment is designed to be modular, where you choose your meter console, pump and components of choice to meet your particular needs.

The Apex Method 5 Sampler System provides a reliable and versatile foundation for performing most isokinetic testing methods.

Typical Industries Tested by Apex Isokinetic Equipment:

  • Acid Plants
  • Asphalt Plants
  • Boilers
  • Cement Plans
  • Chemical Manufacturing
  • Furnaces
  • Incinerators
  • Municipal Waste Combustors
  • Petroleum Refineries
  • Power Plants
  • Pulp and Paper Mills
  • Smelters
  • Steel Mills

Method Specific Recommended Components

EPA Government Brochure on Method 5 Sampling

Isokinetic - Method 5 IconMETHOD 5

Particulate Emissions from Stationary Sources – The professional source sampling company must be prepared for a wide variety of conditions and locations. Apex recommends the “Deluxe Plus” system, which can be used in both rigid and flexible configurations. Even with the classic rigid arrangement, the additional glassware allows you to have pre-measured and filled impingers, pre-weighed filter assemblies, and minimum turnaround time between runs.

Isokinetic - Method 17 IconMETHOD 17

Particulate Emissions by In-Stack Filtration – Add an in-stack filter assembly and longer pitot tip to a Method 5 system. The Apex Instruments Method 17 Sampling Kit is a convenient package for sampling particulate matter.

Isokinetic - Method 23 Icon


Dioxins / Furans – The Apex Instruments Method 23 (Modified Method 5) Source Sampler Kit is used for determination of dioxins and furans (D/F’s) in accordance with Method 23 and/or Determination of Semi-Volatile Organic Compounds as M0010. This train adds a water-cooled glass condenser, an XAD adsorbent module, and a large capacity METHOD 23 knockout impinger to the Method 5 system.

Isokinetic - Method 26A IconMETHOD 26A (HCI)

Hydrogen Halide & Halogen Emissions – the M26A kit adds impingers, reagents, and PTFE coated glass filters to a Method 5 train. The Apex Instruments Method 26A Sampling
Train is used for determination of hydrogen halide and halogen emissions. Method 26A is the isokinetic alternative to Method 26. This method is particularly suited for sampling sources controlled by wet scrubbers emitting acid droplets.

Isokinetic - Method 29 IconMETHOD 29 (Multiple Metals)

Metal Emissions – Add up to three impingers, the SB-4 impinger case, glass nozzles, probe liners and non-metallic union to a Method 5 train. The method has been validated for the collection of 17 different metals.

Isokinetic - Method 201AMETHOD 201A

Particle Sizing – Add cyclones to a Method 5 system. The purpose of Method 201A is to measure particulate matter emissions equal to or less than given nominal aerodynamic diameter(s). In general, a gas sample is extracted from a stationary combustion source at a predetermined constant flow rate through in-stack sizing devices. As amended, Method 201A now combines the existing method (PM10) with a PM2.5 cyclone to create a sampling train that includes a total of two cyclones.

Isokinetic - Method 202 IconMETHOD 202

Condensable Particulate Matter (CPM), Dry Impinger Method – This isokinetic method is used to measure Condensable Particulate Matter (CPM) from stationary source emissions after particulate matter has been removed by a heated filter, such as in Method 5, 17 or 201A. The CPM is collected in dry impingers maintained at 80°F.