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１引言系统在线运行的过程中，故障是难免的。由于仪表质量的差别以及工作条件的不同，系统的故障率也有所不同。通常系统运行初期，由于工艺不正常，各类故障较多，这些故障有可能出自控制系统和仪表本身，也可能出自工艺部分。就仪表部分的整体故障而言，故障比例较大的是执?
1 Introduction The system is running online, the failure is inevitable. Due to differences in instrument quality and different working conditions, the system failure rate is also different. Usually the initial operation of the system, due to abnormal technology, more types of failures, these failures may come from the control system and instrumentation itself, may also be part of the process. In terms of the overall failure of the instrumentation part, the larger the proportion of failure is enforced?