Presence Sensing Devices for Machine Guarding
A presence sensing machine guard is one which, without placing a physical barrier between the operator and the dangerous parts of the machine, senses the approach of a body or part of a body and, ensures that:
- While any part of an operator’s body is within the sensing field of the device, dangerous motion cannot start; and
- Should any part of the operator’s body enter the sensing field of the device while the machine is operating, all dangerous motion shall stop before the operator can reach the dangerous parts.
This guide discusses examples of their use.
Table of Contents
MACHINERY HAZARDS
Requirements of the Machinery Act 1950
Description and Requirements
Application
Other Guarding to be Used
PHOTO-ELECTRIC DEVICES
Construction
Problems
Remedies
Light Emitting Diodes (LEDs)
Control Unit
RADIO FREQUENCY CAPACITANCE SYSTEMS
Disadvantages
ULTRASONIC DEVICES
PRESSURE SENSITIVE MATS
Disadvantages
PRESENCE SENSING DEVICES USED FOR GUARDING PRESS BRAKES
