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Shutdown Mistake-Proofing Devices
Shutdown Devices Mistake-proofing solutions using shutdown
effects can be almost as powerful as those using forced control
effects.
Mistake-proofing solutions that achieve a shutdown effect
halt the process:
After determining that a failure is about to
occur - a prevention outcome; or
After identifying that a failure
just occurred - a detection outcome.
Most techniques that shut
down a process are the result of an electronic sensor detecting a
problem or a potential problem.
Today, there are almost as many
types of sensors as there are potential problems in the process.
Families of sensors include limit switches, proximity switches,
laser displacement sensors, visions systems, counters & timers,
photoelectric sensors, and ultrasonic sensors. In addition, there
are entire families of process measurement instrumentation and
specialty sensors.
