The first and most common sensing method is through-beam. This sensing method requires two housings: one for the transmitter and another the receiver. The transmitter and receiver must be facing each other and aligned, an object is sensed once it has blocked the light from reaching the receiver. This is an extremely reliable sensing method the E3Z series includes a sensing range of up to 30 meters. Extended range means that the light emitted is also strong enough to blast through dirt and grime build up at shorter ranges. Some examples of applications the E3Z Through-beam excels in is monitoring conveyor lines for possible overflow or jamming, a timer is necessary to determine that an object has been in view of the sensor for too long, indicating something in the line caused a jam. Other applications include using the pair to detect if an object is in the correct upright orientation, specifically if the part has fallen and is no longer blocking the light from the transmitter or if long range presence/absence is necessary.