A method and device for indicating whether a dispensable product will require refilling prior to the next scheduled service interval includes tracking the amount of use over a first interval, and calculating a frequency based from the use over the first interval. The quantity remaining is compared with the required amount, which is the product of the number of weeks in the service interval and the calculated frequency. Thus, when the quantity remaining is less that the required amount, a warning will be provided to indicate that the dispensing product should be replaced, as it will be empty before the next service interval.

A method and device for indicating whether a dispensable product will require refilling prior to the next scheduled service interval includes tracking the amount of use over a first interval, and calculating a frequency based from the use over the first interval. The quantity remaining is compared with the required amount, which is the product of the number of weeks in the service interval and the calculated frequency. Thus, when the quantity remaining is less that the required amount, a warning will be provided to indicate that the dispensing product should be replaced, as it will be empty before the next service interval.

An acoustic volume sensing device is disclosed. The device includes a housing comprising a reference volume chamber and a variable volume chamber, the reference volume chamber and the variable volume chamber connected by a resonant port, a first MEMS microphone located in acoustic relation to the variable volume chamber, a second MEMS microphone located in acoustic relation to the reference volume chamber, a MEMS speaker located in acoustic relation to the reference volume chamber, and a circuit board in electric connection with the first and second MEMS microphones and the MEMS speaker.

An acoustic volume sensing device is disclosed. The device includes a housing comprising a reference volume chamber and a variable volume chamber, the reference volume chamber and the variable volume chamber connected by a resonant port, a first MEMS microphone located in acoustic relation to the variable volume chamber, a second MEMS microphone located in acoustic relation to the reference volume chamber, a MEMS speaker located in acoustic relation to the reference volume chamber, and a circuit board in electric connection with the first and second MEMS microphones and the MEMS speaker.

An event identifier is received. The event identifier identifies an amount of content dispensed from a container detected using a sensor device that includes a transmitter configured to transmit an interrogation signal and a receiver configured to receive the interrogation signal that has been reflected within the container. A transaction identifier of a transaction associated with quantities of different component ingredient items is received. The amount of content dispensed from the container is automatically correlated with the transaction at least in part by matching the amount of content dispensed from the container with at least one of the component ingredient items associated with the transaction.

A circuit is set up for a container or vessel (10) as shown in FIG. 1, which has a microphone (20), a speaker (30), a frequency control device (40) volume control device (50), an amplifier (60), a frequency reader (70) and a spectrum analyzer (80). The oscillation in the circuit is created by applying power to the amplifier (60) which creates an initial fixed standing wave that does not move. Adjusting or changing components, invokes a new behavior of the circuit which is parasitic in nature and reading of oscillating frequency on the frequency reader (70) determines the change of conditions inside the vessel or container. The method is non-intrusive, and the method of this invention can also be used for measurement of miniscule quantities in microns or micro liters such as that of biofilm or algal growth.

A cartridge for an aerosol-generating system includes a liquid storage portion configured to store a liquid aerosol-forming substrate. The liquid storage portion includes one or more flexible walls and is configured to change at least one of the shape and the size of the liquid storage portion upon a change of the volume of the liquid aerosol-forming substrate held in the liquid storage portion. The cartridge includes a sensor configured to detect data of a physical property. The data relates to at least one of a corresponding shape and a corresponding size of the liquid storage portion so that the volume of the liquid aerosol-forming substrate held in the liquid storage portion is determinable from the measured data.

A volume measurement system and method for a closed water-filled karst cave, including a water collecting device, concentration tester and control system. The control system is connected to the water collecting device by a connecting piece. The water collecting device is a container with a top closed and bottom open. The water collecting device top is a piston. The piston is connected to a propulsion rod, and propulsion rod is controlled by control system to extend or retract, so as to realize the forward or backward movement of the piston. An openable and closeable placement table is hinged to the water collecting device's inner wall. The placement table is connected to piston, the placement table moves upward when piston is raised, and placement table moves downward when piston is lowered. The placement table is configured to accommodate a chemical substance. The concentration tester is configured to detect the solution's concentration

A volume measurement system and method for a closed water-filled karst cave, including a water collecting device, concentration tester and control system. The control system is connected to the water collecting device by a connecting piece. The water collecting device is a container with a top closed and bottom open. The water collecting device top is a piston. The piston is connected to a propulsion rod, and propulsion rod is controlled by control system to extend or retract, so as to realize the forward or backward movement of the piston. An openable and closeable placement table is hinged to the water collecting device's inner wall. The placement table is connected to piston, the placement table moves upward when piston is raised, and placement table moves downward when piston is lowered. The placement table is configured to accommodate a chemical substance. The concentration tester is configured to detect the solution's concentration

In order to calibrate a flow rate instrument, the following is provided: introducing a fluid controlled by a flow rate control instrument to a certain set flow rate into a container via a piping member and calculating a first time rate of change in pressure in the container; introducing a fluid controlled by the flow rate control instrument to the set flow rate into a container via a piping member while making any of a capacity of the container into which the fluid is introduced, a number of containers into which the fluid is introduced, a temperature of the fluid, and a type of the fluid different, and calculating a second time rate of change in pressure in the container; and calculating a capacity of the piping member based on the first time rate of change in pressure and the second time rate of change in pressure.