Omron E3Z-T81A-D Through-Beam Photoelectric Sensor, Thru-Beam Receiver. This unit is the receiver portion of a through-beam photoelectric sensor system from Omron, identified by the model E3Z-T81A-D. In a through-beam configuration, a light beam is projected across a defined path and the receiver detects interruptions, signaling when the beam is broken along that path and producing a corresponding output. The designation “Thru-Beam Receiver” clarifies its function within the sensor arrangement as the light-beam receiver in Omron's E3Z family.
