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Machine safeguarding, presence sensing devices control machine operations and protect personnel by detecting the presence of objects that could interfere with or be harmed by machinery. Activating a machine safeguarding, presence sensing device sounds a warning, ends a process, initiates a different machine action, or stops the machine altogether. Several types of devices are commonly available. Area guarding systems are used to monitor large areas such as shop floors. By contrast, perimeter guarding devices are designed to monitor the edges of machines. Door and gate guarding devices prevent employees from entering restricted areas, typically during machine operation. Process protection devices are used to protect personnel during equipment service and maintenance. Machine protection devices are used to monitor and guard operators during normal machine operation. 

Machine safeguarding, presence sensing devices use many technologies. Contact strips and bumpers contain pressure-sensitive edges that stop the machine when contact is sensed. By contrast, emergency stop (e-stop) switches are activated by pushing a button or flipping a switch. Cable pull switches are also available. RF presence sensors transmit a high frequency signal that, when disturbed, stops the machine or process. Similarly, ultrasonic sensors use high frequency sound to monitor processes or machines. Laser presence sensors are used to sweep large areas and detect foreign objects. Safety mats are suitable for guarding the floor near a machine or robot. Light curtains use a photoelectric transmitter to generate multiple beams of light. When an opaque object interrupts one or more beams, the light curtain controller sends a stop signal to the guarded machine. Safety gates are movable barriers that protect operators before the machine cycle can be started. Intrinsic safety (IS) barriers are devices that limit the current, voltage, or total energy delivered to a sensor in a hazardous area or flammable environment. Safety relays differ from conventional relays in that they have force guided (positive driven) contacts. Safety interlock switches are available in a variety of form factors and with both contact and non-contact activation. 


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Engineering Web: Machine Safeguarding, Presence Sensing
Pages: 1 - 5 of 70154
eFunda Directory Service: Manufacturing , Processing and Tooling > Machine ...
... Vision Equipment, Industrial Machine Safeguarding, Linear Position Sensors. www.sickusa.com Simco Technologies. Machine Vision Equipment, Industrial Machine Safeguarding, Proximity or Presence Sensors ...
Machine Safeguarding Solutions
... safety applications. The presence sensing segmentation has been further divided into light curtains, laser scanners, safety mats, safety edges, and operator interface switches. Machine safeguarding is ...
See ARC Advisory Group Information
What is the definition of machine safeguarding?
presence-sensing mat A type of rug that contains sensors that detect weight or pressure. When placed on the floor around hazardous areas of the machine, these mats can sense an operator's presence and ...
See Tooling University LLC Information
Concepts & Techniques of Machine Safeguarding - Chapter 2
The photoelectric (optical) presence-sensing device uses a system of light sources and controls which can interrupt the machine's operating cycle. If the light field is broken, the machine stops and ...
See Occupational Safety & Health Administration (OSHA) Information
Concepts & Techniques of Machine Safeguarding - Chapter 7
... presence sensing devices, warning devices, and additional system emergency stop devices.. Figure 74. Manufacturing system composed of several cells.. Figure 75. Areas to be considered for safeguarding.. ...
See Occupational Safety & Health Administration (OSHA) Information
See more product announcements for Machine Safeguarding, Presence Sensing
Banner Enginnering Machine Safeguarding Solutions

Banner Enginnering Machine Safeguarding Solutions
AA Electric


Inductive RFID Systems

Inductive RFID Systems
Siemens Energy & Automation, Inc.


The elosafe safety bus system

The elosafe safety bus system
elobau sensor technology, Inc.


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