ASPECTS ON PROFICIENCY TESTING FOR SPARK IGNITION TEST

References: 16th International Multidisciplinary Scientific GeoConference SGEM 2016, www.sgem.org, SGEM2016 Conference Proceedings, ISBN 978-619-7105-57-5 / ISSN 1314-2704, June 28 - July 6, 2016, Book1 Vol. 3, 737-744 pp

ABSTRACT
This paperwork represents a following of the conducted research based on statistical analysis of the probability of ignition resulting from the experimental data obtained with the purpose of highlighting the aspects related to the reproducibility of the results.
In the first part of the paper it was presented the experimentation test rig (spark test apparatus) and the results of the statistical analysis of experimental data obtained during the tests with air-hydrogen explosive mixture. On this occasion it was examined the possibility of choosing the probability distribution of the results by using Cullen and Frey diagrams.
In the second part it was proposed and presented the theoretical model for the geometric distribution density of the number of revolutions to which the ignition of the explosive mixture test has occurred.
The third part was dedicated to considerations regarding the probability of ignition and reproducibility of the spark ignition test results. On this occasion it was found that tests for validating the test rig imposed by the standard had high probabilities of compliance but the tests of an electrical circuit considered safe in terms of explosion protection had unexpectedly low values of probability in passing the test. Thus, it was deduced that the retesting of an equipment that successfully passed a previous test will present very low reproducibility probabilities.

Keywords: proficiency testing, spark test, probability