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dichot

Dichotomous (Dichot) Sampler

Dichot Sampler System (2.5 & 10 Micron)

Andersen Instruments /GMW PM 10/2.5 Dichotomous Sampler accurately monitors ambient air for coarse and fine particulates. The Dichotomous (Dichot) Sampler separates particles into two distinct size fractions 2.5 to 10 microns ("coarse" particles) and less than 2.5 microns ("fine"particles). The virtual impactor ensures that the particulate deposit is uniformly collected on two Teflon membrane filters which eliminate artifact formation, making the Dichot ideal for x-ray fluorescence and other elemental analysis techniques of air sampling. The virtual impactor eliminates possible problems of particle bounce and reintrainment often experienced in other particle size impactor methods.		  
The Dichotomous Sampler operates at a flow rate of 1 CMH (16.7 LPM) and is available with built-in mechanical 6-day or 7-day timers, or an electronic digital programmable timer. Separate sampling and control modules allow for flexibility in deployment. The weather resistant control module houses the diaphragm vacuum pump, precision flow meters, flow selector valves and vacuum gauges, as well as the flow controller and flow recorder.

The PM 10 Inlet and 2.5 Virtual Impactor ensures accurate particulate collection. The unique design of the PM 10 inlet allows only particles smaller than 10 microns to enter the virtual impactor, where they are separated into two size fractions and collected on Teflon membrane filters.
CMH (1.67LPM) for collection of the coarse particles, while the fine particles, less than 2.5 microns, follow a flow of 0.9 CMH (15 LPM)to the fine particle filter.

Features

  • The SA246B PM 10 Inlet has been extensively tested and is the EPA standard for PM 10 low volume sampling
  • Accurate flow controlled precision machining of the virtual impactor allows accurate PM 10 and PM 2.5 data
  • Flow rates are easily audited by a total flow audit adapter connected to an external low pressure reference flow device
  • Automatic sample termination when flow levels can not be maintained