This report presents a procedure to determine the
uncertainty of an automated emission measuring system
(AMS) by comparing the results with a second method
(REF). The procedure determines the uncertainty of AMS by
comparing the final concentration and emission results of
AMS and REF. In this way, the data processing of the
plant is included in the result evaluation.
This procedure assumes that the uncertainty of REF is
known and determined in due form.
The uncertainty determination has been divided into two
cases; varying and nearly constant concentration.
The suggested procedure calculates the uncertainty of AMS
at the 95 % confidence level by a tabulated t-value. A
minimum of three data pairs is required. However, a
higher amount of data pairs is desirable, since a low
amount of data pairs results in a higher uncertainty of
The uncertainty of AMS is valid only within the range of
concentrations at which the tests were carried out.
Statistical data processing shows that the uncertainty of
the reference method has a significant effect on the
uncertainty of AMS, which always becomes larger than the
uncertainty of REF. This should be taken into account
when testing whether AMS fulfils the given uncertainty
Practical details, concerning parallel measurements at
the plant, and the costs of the measurement campaign,
have been taken into account when suggesting alternative
ways for implementing the comparative measurements.
|Place of Publication||Espoo|
|Publisher||VTT Technical Research Centre of Finland|
|Number of pages||34|
|Publication status||Published - 1999|
|MoE publication type||Not Eligible|
|Series||VTT Tiedotteita - Meddelanden - Research Notes|
- measuring methods
- automatic measuring systems
- industrial plants
- gaseous pollutants
- flow rate