内部诊断的周期

每台取得 SIL 认证的测量设备,都有一个内部诊断程序,可以检测到设备中所有可能故障的 95%;如有必要,可以将设备切换到故障状态并向安全系统报告。

许多开发历史久远的设备,内部诊断间隔仍然是 30 — 60 分钟;当安全功能发生故障时,错误可能会持续 60 分钟而未被检测到。

同时,现代安全设备的单次诊断耗时被缩短为 30 ~ 120 秒;因此,这些设备甚至被批准用于要求最高的“连续运行模式”。 

KROHNE is a leading system provider in the field of industrial process measurement instrumentation. Employing over 4,000 people worldwide, KROHNE provides complete solutions for flow, level, pressure and temperature measurement, as well as for process analysis. In addition to these measurement devices, KROHNE offers commissioning, calibration and maintenance services.
The name KROHNE stands for innovation, reliability and high-quality products.

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