What is the purpose of a Foam on Beer (FOB) detector in a draft system?

The purpose of a Foam on Beer (FOB) detector in a draft system is to minimize beer waste during keg changes. A FOB detector is designed to sense the foam generated in the beer line and automatically shut off or control the flow of beer when it detects foam, which is an indication that the keg is close to being empty or has been changed. This prevents excess foam from being pushed through the system, which can occur during keg replacements, thereby reducing the amount of product that is wasted due to foaming.

This system is crucial in draft beer service because foam, while essential for a good head on a pour, can lead to significant product loss if a keg is not fully tapped or when transitioning between kegs. By managing foam levels, an FOB detector helps ensure that the beer poured is consistent and minimizes spillage or over-pouring, which can lead to economic loss for operators and a poor customer experience.

The other choices, while they describe important aspects of beer handling, do not directly relate to the core function of a FOB detector. Increasing carbonation and regulating flow are tasks typically managed through different systems or equipment, while detecting temperature changes, although important for overall beer quality, falls outside the specific role of a FOB detector.