If hot gasses emitted from a stack are directly placed in a Tedlar or Nalophan bag they begin to develop condensation. These small droplets of water absorb many of the critical components that contribute to the overall odour of the sample. The stack diluting sampler eliminates this problem by mixing the stack air with dry clean Nitrogen so that the moisture can’t condense inside the bag. The mixing happens inside the probe and since the probe becomes at the same temperature as the stack air, there is no chance of the sample developing condensation before being mixed with Nitrogen.

Stack Diluter Basics of Operation

• Attach sample bag
• Open valve on the nitrogen micro tank
• Select the desired dilution from 1:3 to 1:305 bu, while installing the corresponding dilution disk
• Insert the probe into the stack and allow 3 minutes for it to reach the same temperature as stack gases
• Press the trigger and wait for the sample bag to fill

For more information on the Stack Diluter Sampler, click here!

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Mixing of odorous gas and odour-neutral air measured by flow rate. The consistent introduction of odour-free or odour-neutral air to a concentrated amount of an odorous gas allows for accurate measurement when determining the severity of the odour’s concentration and intensity.

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A ratio of diluting neutral gas to odorous sample gas.  According to ASTM E679, this is a ratio of diluting gas to the odour sample. According to EN13725, this is a ratio of the sum of the diluting gas and odour sample, to the odour sample.  It is calculated based on the flow rate.

Example

5 parts of diluting air to 1 part of sample

ASTM E679:  Diluting gas/odourous sample = 5:1 = 5

EN 13725:  (diluting gas + odourous sample)/odourous sample = 6:1 = 6

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A federal law passed in 1970 and amended in 1974, 1977, and 1990 which forms the basis for the national air pollution control effort. Basic elements of the act include national ambient air quality standards for major air pollutants, mobile and stationary control measures, air toxics standards, acid rain control measures, and enforcement provisions.

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Exposure is a combination of the amount of a pollutant in the air and the amount of time that a person stays in the presence of a pollutant. Exposure determines the level of risk associated with different levels of pollutants.

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