Laser scanners
A second ESPE installed horizontally or at an angle is often used to protect against encroachment from behind. Often this only covers a small area, so a scanner can be used for additional optical monitoring of encroachment from behind. A laser beam scans the area to be monitored. If the beam is reflected by a foreign body, this will be detected and the hazardous movement will be shut down.
Safe camera systems
The latest developments on the market are safe camera systems for monitoring freely configurable zones. In contrast to simple sensors, they are able to record and analyze detailed information about the whole monitored zone. This way potentially hazardous work processes are safely monitored, protecting man and machine.
Pressure sensitive mats
Many pressure sensitive mats operate in accordance with the normally open principle: They require the use of special evaluation devices, which account for this actuation principle and guarantee appropriate fault detection. Pressure sensitive mats that operate to the normally closed principle are also available, however; where a low safety level is required and the electrical loads are low, these can be used to activate contactors directly.
The most popular material used on pressure sensitive mats is EPDM (Ethylene-Propylene-Diene-Monomer), but as this is not permanently oil-proof, it has limited suitability for use in a machine environment. Other materials such as NBR (Nitrile Butadiene Rubber) are available, but they reduce the sensitivity of the sensor.
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