Allen-Bradley 'Zero-Force' touch-buttons from Rockwell Automation are
based on field-effect technology, so they do not require any pressure to
activate them; they are also ergonomically styled for repetitive
activation, their contoured surfaces mimicking the shape of a human palm
- a combination that significantly reduces the risk of repetitive strain
injury.
Two independent sensors register the operator's touch and convert it into
an electrical output. Both sensors must be activated within 0.2s for the
operation to begin, making the device intelligent enough to distinguish
between human touch and that of foreign objects. Meeting CE and UL
standards, the touch buttons are available in general purpose and heavy
industrial styles, both IP66 rated.