Page 333 - IGC BOOK

Pressure-Sensitive Mats

Pressure-sensitive mats are designed to cut the machine’s power if someone steps on them to
access a dangerous part.

Pressure-sensitive mats use a number of well-spaced electrical or fluid switches or valves in a

mat. The mat covers any entries to a restricted space. Pressure on the mat stops the automatic
operation of the machine.

Advantages Limitations
• Can allow freer movement for operator • Does not protect against mechanical failure
• Simplicity of use • Can be over-ridden by the operator.
• Used by multiple operators • Frequent trips due to over sensitive.
• Provide passer by protection • Takes time to come to the idle position, the
• No adjustment required operator may approach before machine
stops completely.

Two-Hand Controls

The two-hand control requires constant, concurrent
pressure by the operator to activate the machine. With
this type of device, the operator's hands are required to
be at a safe location (on control buttons) and at a safe
distance from the danger area while the machine
completes its closing cycle. Only use this method to
isolate people from machinery hazards as a last resort.

Two-hand controls should:

• need to be turned on together (so people cannot tape one control down)
• need to be held to run, so the machine stops immediately when the control is released

• be spaced well apart and shrouded so one arm cannot run both controls.

The rear and sides of the machine should be guarded by fixed guards to prevent stop access by
other people.

Advantages Limitations

• Protects operator hand • Protects only operator not others
• Machine stops when one hand is released. • Can be easily by-passed.

ENSIGN | Unit IG2 – Element 9 – Work 17
Equipment