OMNI-BEAM dc power blocks provide regulated low voltage dc power to the sensor head and logic module (if one is used), with input of 10 to 30V dc. There are two infinite-life outputs, one for the load and the other for the alarm of the D.A.T.A. self-diagnostic system. All models, except emitter-only types, have the unique Bi-Modal output design that offers either sinking (NPN) or sourcing (PNP) outputs, depending upon the polarity with which the two dc supply leads are connected. Outputs are protected from overload, shorted load, or low voltage conditions. Outputs automatically reset when the cause of the problem is cleared. Problems are identified by the D.A.T.A. light system. All standard OMNI-BEAM power blocks are epoxy-encapsulated and rated for -40 to +70 C (-40 to +158 F). They feature limit switch style cross-hole design for front, back, or side mounting, plus a 30mm threaded hub for swivel bracket or through-hole mounting.