BM-25 Diaphragm Switch for Non-Hazardous LocationsBM 25 Diaphragm Switch: Point level detector for bins and chutes The BM 25 diaphragm switch is a pressure sensor for high or low level alerts in bins containing non hazardous, free flowing dry materials. It is made durable, high impact nylon plastic that will not corrode and withstands the harshest weather environments. Use it to reduce overfills and stop wasting valuable grains and fertilizer. With the BM 25 you will know when chutes or conveyors are