Chemical Technology March 2015

CONTROL &

INSTRUMENTATION

Figure 1: Application of protective measures

Figure 2: Visual representation

machines on the market with permanently fixed guards or shields in place. While these components of the overall safety system have specific requirements pertaining to proper de- sign and use, these elements do not have functional safety

functional safety requirements, as is the case for the use of fixed barriers to permanently prevent access or to retain hazards. Permanent separation of individuals from hazards is clearly a safety function, as is evident by the number of

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Chemical Technology • March 2015