In one embodiment, an industrial process control system includes a field device configured to provide an alert. The various embodiments include improved hinges, locking tabs, ribs, detachable base panel with center bar, grips, fold-resisting abutments, and fold-over panels. The second channels are formed in the monolithic body so each second channel is electrically isolated from, yet adjacent to a first channel, resulting in an alternating configuration of first and second channels. The vaporizing unit includes a hollow conical member located within lower chamber and defining an internal conical passage having a relatively smaller upper end and a relatively larger lower end, said lower end being in communication with the air pump for receiving an upward airflow produced by the air pump. In certain embodiments, the actuator shaft may include slots that allow the actuator shaft to flex upon attachment to from the cap. The colorant is chosen from a pigment, a dye, or a combination of a pigment and a dye.