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SuperSASS Speciation Sampler

Effective June 1, 2026: SASS 120 and SASS 220 have been replaced by the SuperSASS. We plan to provide technical support and maintenance services for the SASS 120 and SASS 220 until June 1, 2031. If you have any questions, we are here to help. Simply email sales.moi@acoem.com.

The SuperSASS Speciation Sampler from Met One Instruments Powered by Acoem is designed to comply with and exceed EPA Speciation requirements. SuperSASS is an 8-channel, multiple-event sampling system. It conforms to original EPA requirements and adds benefits suggested by state and local authorities. SuperSASS uses concepts pioneered by Met One Instruments, such as the contamination-free canister, solar radiation shield, and modular design. Not only does it comply with EPA specifications, SuperSASS exceeds the specifications, as proven in EPA and California Air Resources Board (CARB) field studies.

 

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Features

SuperSASS will sample up to eight days depending on the number of sample channels used per day. SuperSASS comes standard with four independent volumetric flow controllers, one for each sampler group.

  • Up to 8 Channel Operation
  • One to Eight day Sampling, Sequential
  • Automatic Volumetric Flow Controllers
  • Each Channel may be operated independently
  • Advanced Field Audit Screens

Testing and Experience

The SuperSASS is based on designs that have been field-tested for eight years, including three years of testing in the EPA program. This testing has proven the concept and helped to refine the design.

Portability

Designed for programs on the move, the system offers superior flexibility and portability. SuperSASS is composed of a portable pump box, tripod, sample head, and controller, making it easy to carry and install. Installation takes less than one hour.

No Field Maintenance

The SuperSASS allows all critical maintenance to be performed in the lab. Other instruments suffer contamination of the inlet, manifold, and $\text{PM}_{2.5}$ separator because they must be serviced in the field. With the integrated canister, every element of the sampler that comes into contact with the sampled airstream is cleaned with each sample change.

No Field Contamination

Sample canisters are loaded in the lab with blank filter cassettes. Sealed canisters are shipped to speciation field sites for deployment. After exposure, the canisters are sealed for shipment back to the lab. This approach circumvents contamination due to field handling of the sample.

Temperature Control

SuperSASS incorporates a convective solar radiation shield to maintain the samples within 5°C of ambient temperature.

Field and Lab Tested PM 2.5 Inlet

A Sharp Cut Cyclone (SCC) with a flow rate of 6.7 liters/min is integrated into every sampling canister to remove particles larger than 2.5 μm in aerodynamic diameter. A test report is available upon request.

Canister Configurations

The sample canister contains the SCC and all necessary components for excluding particles above 2.5 μm aerodynamic diameter, removing interfering gases, and collecting particles (including semi-volatile compounds). The sampling canisters are designed to accommodate denuders and one or two filters for sampling of semi-volatile species, and for the 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 a backup filter for artifact collection.
  5. Denuded carbon-impregnated filter for semi-volatile organic compounds.

Applications:

Specifications are subject to change at any time.
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