Safety Instrumented Systems or SIS form an integral part of process safety management in the oil, gas and chemical industries. These systems help integrate safety controls and automation logic at a plant or facility level to prevent or mitigate potentially hazardous conditions. A key function of SIS is automatically executing safety instrumented functions to achieve and maintain a saf... https://www.zupyak.com/p/4427673/t/safety-instrumented-system-an-essential-risk-reduction-layer-for-process-industries