The ST4 series from SUNX offers a single beam safety sensor for machine guarding applications that do not require full light curtain setup. The ST4 series can be expanded to allow for 6 sensors wired in series and up to three controllers for a total system of 18 sensors. This allows for coverage of a larger area with full interference prevention. The sensor heads of the ST4 series have a compact size that is similar to that of the CX-400 general purpose sensors. They also utilize the same mounting pitch for a simple, standardized mounting approach.