1. A sensing apparatus for a beverage dispenser, comprising:
a sensor housing having an interior area fluidly connected to a pump gas exhaust port; and
a sensor positioned within the interior area,
wherein the sensor generates a first signal representative of a first supply condition of the pump, and
wherein the sensor generates a second signal representative of a second supply condition of the pump.
2. The sensing apparatus of claim 1, wherein the first supply condition represents a filled
pump, and
wherein the second supply condition represents an empty pump.
3. The sensing apparatus of claim 1, further comprising a sensor activation device disposed in a channel, the channel connecting the interior area to the pump exhaust port, wherein the sensor activation device interacts with the sensor to generate one of the first and the second signal.
4. The sensing apparatus of claim 1, wherein the sensor is selected from a group consisting of a microphone, a flow-meter, an electromagnetic device, and an electromechanical device.
5. The sensing apparatus of claim 1, wherein the pump supplies a beverage concentrate.
6. The sensing apparatus of claim 1, wherein the pump is a compressed-gas powered positive displacement pump.
7. A method of determining a sold-out state of a beverage dispenser, the method comprising:
providing a beverage dispenser including: a pump having a gas exhaust port,

a dispensing valve, and
a sensor disposed on the pump gas exhaust port;
activating the beverage dispenser to dispense a beverage through the dispensing valve;
during the activating, sensing a gas exhaust pattern of the pump; generating a signal based on the sensed gas exhaust pattern; and determining whether the beverage dispenser is in a sold-out state.
8. The method of claim 7, further comprising:
generating a first signal based on a first gas exhaust pattern representative of a filled state of a concentrate container or a second signal based on a second gas exhaust pattern representative of a sold-out state of the concentrate container.
9. The method of claim 7, wherein a control module is configured to receive the first and the
second signal, and
wherein the control module determines a state of the concentration container based on the received signal.
10. The method of claim 9, wherein determining the state of the beverage dispenser comprises comparing the signal to a stored signal using an algorithm.
11. The method of claim 7, further comprising providing feedback about the sold-out state to a user interface of the beverage dispenser.
12. The method of claim 7, wherein the sensor is selected from a group consisting of a microphone, a flow-meter, an electromagnetic, and an electromechanical device.
13. A beverage dispensing system comprising:
a beverage dispenser including a pump;
a sensor connected to a gas exhaust port of the pump to generate a first signal representative of a first supply condition of the pump and a second signal representative of a second supply condition of the pump;

a control module configured to communicate with the sensor; a user interface in communication with the control module configured to provide feedback to a user,
wherein the feedback comprises a sold-out state of the beverage dispenser.
14. The beverage dispensing system of claim 13, wherein the control module is configured to determine a state of the beverage dispenser based on the generated signal using an algorithm.
15. The beverage dispensing system of claim 13, wherein the first supply condition is a filled state and wherein the second supply condition is an empty state.
16. The beverage dispensing system of claim 13, wherein the sensor is contained within an interior area of a sensor housing, the sensor housing having an interior area fluidly connected to the pump gas exhaust port.
17. The beverage dispensing system of claim 13, wherein the sensor includes an activation portion that activates the sensor to generate one of the first and the second signal.
18. The beverage dispensing system of claim 13, further comprising a pressure supply source, a diluent supply source, and a beverage concentrate source connected to the beverage dispenser.
19. The beverage dispensing system of claim 13, wherein the first supply condition represents a partially full pump.
20. The beverage dispensing system of claim 13, wherein the sensor is a microphone, a flow-meter, or an electro-mechanical device.