BEER FOB = Foam on Beer Detectors in our industry. When an FOB is installed on a long draw beer line and the keg empties, the beer flow is stopped immediately. The beer line remains full of beer, instead of filling with foam.
Keeping the lines full of beer eliminates the need to refill the lines and purge the system with beer when tapping the next keg. This will significantly reduce beer waste. The actual reduction is based on the length of draw of the beer system being considered.
Beer flowing from the keg forces the float inside of the FOB into the up position, allowing beer to flow to the faucet.
When a keg empties, the float drops down stopping the beer flow from the keg.
Tap a new keg and reset your FOB. Pushing the vent mechanism allows the gas/foam to release from the chamber. This function allows beer to flow from the keg into the chamber, lifting the float and allowing beer to flow to the faucet.