Second CSITC round trial concludes

04 Jul '07

2 min read

The second Round Trial conducted under the auspices of the Task Force on Commercial Standardization of Instrument Testing of Cotton (CSITC RT 2007-2) was conducted during April and May 2007. 54 testing facilities with 74 instruments participated, up from 70 instruments in the first Round Trial conducted in January.

Participating testing centers were located in Europe, North America, South America, Africa, Asia and Australia. Five cotton samples of known values were mailed to each participating laboratory in March.

Each laboratory tested each sample six times each day for five days. Each sample was tested for the six CSITC parameters of length, length uniformity index, micronaire, strength, Rd (reflectance) and +b (yellowness). Four of the samples were from upland saw ginned cotton; the fifth sample represented Indian roller ginned cotton.

Laboratories sent their results to the Bremen Fibre Institute for evaluation. Laboratories were given an overall ranking, as well as rankings for performance on each of the six tests.

The names and results from each test center are confidential, but each testing facility receives an evaluation of its performance in the Round Trial and a detailed diagnostic analysis of results designed to facilitate improved performance.

Rankings were based on the results of each lab in coming closest to the mean values for all laboratories participating in the Round Trial on all six measurements.

The range of scores for the combined properties among the 74 instruments was 0.24 to 2.15 (a score of zero would be perfect), and the median overall evaluation of combined properties was 0.51.

The results in CSITC RT 2007-2 are highly consistent with the results from RT 2007-1, where results varied from 0.22 to 3.02 with a median of 0.50.

The average difference between the evaluation grades of identical instruments in comparison between RT 2007-1 and RT 2007-2 was 0.1, meaning that the evaluation of each single testing facility, and therefore its accuracy, is quite stable.

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