Speciation Samplers are designed to meet or exceed the EPA’s Speciation requirements. There are two models available: the SASS, which is a 5-channel sampling system, and the SUPER SASS, which is an 8-channel multiple event sampling system. Both models use features pioneered by Met One Instruments, such as the contamination-free Canister, solar radiation shield, and modular design.

The SASS is a portable integrated ambient particulate sampling system that samples PM2.5 at a rate of 6.7 liters/minute. It features a solar shield that maintains cassettes to less than <5°C over ambient temperature, a new multi-cell denuder, and multiple filter medias. The SASS is designed to comply with EPA requirements and has been shown to exceed these requirements in field studies conducted by the EPA and California Air Resources Board.

The SUPER SASS has all the features of the SASS, with the added benefit of sequential programming, which allows for multiple-day operation. It can sample up to eight days, depending on the number of sample channels used per day. The SUPER SASS comes standard with four independent volumetric flow controllers, one for each sampler group, and each channel can be operated independently. Advanced field audit screens are also available.


The sample canister contains the SCC and all necessary components for excluding particles above 2.5 μm aerodynamic diameter, for removing interfering gases, and for collecting particles including semi-volatile. The sampling canisters are designed to accommodate denuders and one or two filters for sampling of semi-volatile species, and for collection of gases such as nitric acid, ammonia, and formic acid. For example, a Teflon Nylon filter pair can be operated behind a nitric acid denuder to include inorganic ions and nitrate in the same cassette. Canisters can be used as follows: (1) Teflon filter for mass and trace metals, (2) Teflon or Quartz for inorganic ions by ion chromatography, (3) Denuded Nylon or impregnated filter for nitrate, (4) Tandem Quartz for organic and elemental carbon, with backup filter for artifact collection, (5) Denuded carbon-impregnated filter for semi-volatile organic compounds.