Stepupstress accelerated degradation testing of ammonianitrogen    water automatic monitor

YE Hongbo1, MIAO Jian2, SHEN Guangyue3, CHEN Wenhua1, PAN Jun1

（1.Key Laboratory of Reliability Technology for Mechanical and Electrical Product of Zhejiang Province, Zhejiang
SciTech University, Hangzhou 310018, China; 2.Zhejiang province institute of Metrology, Hangzhou 310000,
 China; 3.Mechanical and electrical engineering college, China Jiliang University, Hangzhou 310018,China)

Abstract: Aiming at addressing the problem that how to assess the reliability of ammonianitrogen water automatic monitor(ANWAM) in a short period，the failure mechanism of ANWAM was firstly identified，and then a model of degradation path was established based on the degradation values which were the monitor errors of standard specimens, and a accelerated degradation equation under the temperature stress was established based on the theory of reaction kinetics. The testing data were obtained through conducting the stepupstress accelerated degradation testing (ADT), and were transferred to the data which were equivalent to be obtained through constant stress ADT by using the accelerated degradation equation. The reliability of ANWAM was assessed according to the pseudo failure lifetime. The results indicate that the stepupstress ADT can be used to assess the reliability of ANWAM under the condition that only a few samples and a short period are allowed to conduct the testing.

Key words: reliability assessment;ammonianitrogen water automatic monitor; accelerated degradation testing; pseudofailure lifetime;