Dispensing device for dispensing a beverage, the device comprising: a casing for housing at least part of a duct for a beverage dispensing tap, the casing comprising: an elongate bore having a proximal opening and a distal opening for housing and guiding the duct; a first signal electrode provided over at least part of the length of the bore; a second signal electrode provided over at least part of the length of the bore; a circuit for detecting a flow through a duct of a tap for dispensing beverages, the circuit comprising: an alternating signal source having a signal terminal arranged to provide an alternating signal to a capacitive element comprising two electrodes provided adjacent to the duct along at least part of the length of the duct and the signal source further comprising a zero terminal, the signal terminal being connected to the first signal electrode; a detection circuit arranged to be connected to the capacitive element and arranged to detect a signal amplitude value, the detection circuit being arranged to provide a detection signal based on the signal amplitude value at a detection terminal comprised by the detection circuit, the detection terminal being connected to the second signal electrode; a processing circuit arranged to: - receive the detection signal; - determine whether the detection signal satisfies a pre-determined criterion; - provide a flow signal if the pre-determined criterion is met; - determine whether the detection signal satisfies a further pre-determined criterion; and - provide a signal if the further pre-determined criterion is met for indicating that no duct is provided in the bore. a casing for housing at least part of a duct for a beverage dispensing tap, the casing comprising: an elongate bore having a proximal opening and a distal opening for housing and guiding the duct; a first signal electrode provided over at least part of the length of the bore; a second signal electrode provided over at least part of the length of the bore; an elongate bore having a proximal opening and a distal opening for housing and guiding the duct; a first signal electrode provided over at least part of the length of the bore; a second signal electrode provided over at least part of the length of the bore; a circuit for detecting a flow through a duct of a tap for dispensing beverages, the circuit comprising: an alternating signal source having a signal terminal arranged to provide an alternating signal to a capacitive element comprising two electrodes provided adjacent to the duct along at least part of the length of the duct and the signal source further comprising a zero terminal, the signal terminal being connected to the first signal electrode; a detection circuit arranged to be connected to the capacitive element and arranged to detect a signal amplitude value, the detection circuit being arranged to provide a detection signal based on the signal amplitude value at a detection terminal comprised by the detection circuit, the detection terminal being connected to the second signal electrode; a processing circuit arranged to: - receive the detection signal; - determine whether the detection signal satisfies a pre-determined criterion; - provide a flow signal if the pre-determined criterion is met; - determine whether the detection signal satisfies a further pre-determined criterion; and - provide a signal if the further pre-determined criterion is met for indicating that no duct is provided in the bore. an alternating signal source having a signal terminal arranged to provide an alternating signal to a capacitive element comprising two electrodes provided adjacent to the duct along at least part of the length of the duct and the signal source further comprising a zero terminal, the signal terminal being connected to the first signal electrode; a detection circuit arranged to be connected to the capacitive element and arranged to detect a signal amplitude value, the detection circuit being arranged to provide a detection signal based on the signal amplitude value at a detection terminal comprised by the detection circuit, the detection terminal being connected to the second signal electrode; a processing circuit arranged to: - receive the detection signal; - determine whether the detection signal satisfies a pre-determined criterion; - provide a flow signal if the pre-determined criterion is met; - determine whether the detection signal satisfies a further pre-determined criterion; and - provide a signal if the further pre-determined criterion is met for indicating that no duct is provided in the bore. - receive the detection signal; - determine whether the detection signal satisfies a pre-determined criterion; - provide a flow signal if the pre-determined criterion is met; - determine whether the detection signal satisfies a further pre-determined criterion; and - provide a signal if the further pre-determined criterion is met for indicating that no duct is provided in the bore.