Warning Mistake-Proofing Devices
A warning device can provide a visual alarm such as a flashing
light or an audible alarm such as a horn or siren.
- These devices
signal that a problem is either about to occur or has just happened.
- With a warning effect, the response is not automatic; someone has
to take action.
A warning signal must be triggered by something in
the process, usually a sensor similar to the ones shown in the
lesson on shutdown effects.
- The alarm can be visual, audible, or
A variety of warning devices are available.
- For audible
warnings, there are sirens, horns, bells, and even voice
- For visual alarms, there are lights that flash,
rotate, strobe, or just light up.
- Even process control panels can
be programmed to flash when there are process problems.
Words of Caution about Warning Mistake-Proofing Solutions
- If you do use warnings, the audible or visual signal must
stand out from background noise and lights.
- If audible alarms
are used, be careful not to exceed noise standards.
- Be careful
of “alarm silence buttons.” It is easy to silence the alarm and
then forget to take action.
- Operators need thorough training
on how to react to warnings.