Oneida Dust Sentry Failure
I have an Oneida Dust Sentry drum level sensor for my dust collector. Unfortunately, the infrared sensor failed. I called Oneida but they would not sell the infrared sensor, nor would they give a part number so I could get it myself. After some searching I found a part that works. It is a Banner S18SN6FF100 that cost me $90 from Banner Engineering. Their website is bannerengineering.com.
The S18SN6FF100 is a Fixed Field (4 inch) sensor with NPN output (150 mA).
Just wanted to pass this information along in case anyone has the same problem. You could also make your own drum level sensor with one of these (or similar) infrared sensors, a 24 volt DC power supply, and a LED flasher. The Banner site shows how to hook up the infrared sensor.