Foam on Beer Detectors (FOBs) Fact Sheet

FOBs installed in a long draw draft beer system will reduce beer waste, save time, improve quality and increase beer profits. The purpose of this article is to describe how a FOB works and to explain how using FOBs can increase profits from draft beer sales.

Beer Waste is Reduced

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.

Stop Pouring Profit down
the Drain

For example, a bar dispenses 10 kegs per week through a system that has a 100-foot beer draw. The beer needed to purge and refill the lines would be more than 50 pint glasses. Multiply the number of glasses by the profit per pint. Let’s say at $2.00 per pint, this would equal $100.00 dollars per week wasted.

A FOB can pay for itself in less than 10 kegs.

As you can see from the example; FOBs installed in a long draw system will reduce your waste and increase your profits.


How FOBs Work

 Kegs per Week

Pints of Beer Wasted per Week

















  Feet of Beer Line




Beer Flow Operates
the FOB

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.

More FOB Facts

FOBs must also be maintained and cleaned on a regular bases the same way beer lines are cleaned.

The FOBs are equipped with a float-lifting device. This device lifts the float off the beer outlet hole, allowing flow of cleaning fluids to enter and exit the FOB detector and travel to the faucet.


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