Item Detector

The Item Detector detects items passing through it, and must be placed between two or more pieces of Pneumatic Tube.

It will not remove the color tags of the items passing through it.

Item Detector Modes:
 * Item Mode: Will emit a Redstone pulse for every item, e.g. 64 pulses for a stack of dirt.
 * Stack Mode: Will emit a single pulse for every stack of an item passing through it, e.g. a single pulse for a stack of cobblestone.
 * Stuffed Mode: Will emit a constant redstone signal whenever there is an item stuffed back into it, which happens if there are no available destinations left for the item.

Behavior
Though item detectors may be considered just a checkpoint in a given tube network, they are considered valid destinations for the purposes of routing. The effect of this is that if you have a tube network setup with painted tubes but the item detector is in the wrong place, items may consider it a valid destination in an of itself, and jam

the item detector in the process. The jam occurs because there are no valid destinations beyond the detector. The slideshow below illustrates this point. In the images shown, the filter on the left is set to send items tagged as white, and there are only blue and black destinations on the right side of the item filter. The first item sent gets jammed in the filter, since it's a "closer valid destination" than the chest above. Finally, once the filter is jammed, it's no longer considered a valid destination, and allows further items to go to the other path, where they might have intuitively gone in the first place.