3 Product description
This chapter provides information on the operation of the safety light curtain and shows
e
xamples of its range of use.
3.1 Structure and function
Overview
T
he deTec4 Ex safety light curtain is an electro-sensitive protective device (ESPE) con‐
sisting of a sender and receiver.
A series of parallel infrared light beams form a protective field between sender and
receiver that protects the hazardous area (hazardous point, access, and hazardous
area protection). When one or more light beams are completely interrupted, the safety
light curtain reports the interruption in the light path to the secure output signal switch‐
ing devices (OSSDs) by a signal change. The machine or its control must safely analyze
the signals (for example using a safe control or safety relays) and stop the dangerous
state.
Sender and receiver automatically synchronize themselves optically. An electrical con‐
nection between both components is not required, but is advantageous.
Figure 2: Sender and receiver
Protective field height
T
he protective field height indicates the range within which the test rod belonging to the
safety light curtain is reliably detected.
Protective field width
The protective field width is the dimension of the light path between sender and
receiver. The maximum protective field width is limited by the scanning range.
PRODUCT DESCRIPTION 3
8022883/2019-03-07 | SICK O P E R A T I N G I N S T R U C T I O N S | deTec4 Ex
15
Subject to change without notice
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