Abstract: A fluid dispensing apparatus includes a pulse generator coupled to a pump that operates in discrete cycles. Each cycle includes a first part in which fluid is drawn into the pump through an inlet, and a second part in which fluid is expelled from the pump through an outlet. Each cycle results in a discrete, consistent volume of fluid being expelled. The pulse generator transmits discrete pulses to the pump, causing the pump to operate for a set number of cycles per pulse. The total number of cycles is a multiple of the number of pulses transmitted, so that the number of pulses determines the volume of fluid dispensed. Alternatively, the pump is driven through increments of the second part of the cycle, with the number of pulses supplied to the pump determining the proportion of the second part of the cycle completed, and therefore the volume of fluid dispensed.

Abstract: An apparatus and method for dispensing a discrete volume of fluid. The apparatus includes a pump operable in discrete cycles, a power source connected to the pump, and a controller connected to at least one of the pump and the power source. The controller is configured to vary the power provided from the power source to the pump during at least a portion of each discrete cycle based on characteristics of the pump and the fluid. For example, the controller may vary power by controlling the duration of the provision of power, or by controlling the amplitude of the power. Varying the power is intended to improve the accuracy of the discrete volume of fluid dispensed. Correspondingly, the method of dispensing a discrete volume of fluid includes receiving information pertaining to the fluid to be dispensed, and adjusting a provision of power to a pump based on the information. The method may include adjusting the duration of the provision of power, or adjusting the amplitude of the provision of power.

Abstract: A fluid dispensing apparatus includes a pulse generator coupled to a pump that operates in discrete cycles. Each cycle includes a first part in which fluid is drawn into the pump through an inlet, and a second part in which fluid is expelled from the pump through an outlet. Each cycle results in a discrete, consistent volume of fluid being expelled. The pulse generator transmits discrete pulses to the pump, causing the pump to operate for a set number of cycles per pulse. The total number of cycles is a multiple of the number of pulses transmitted, so that the number of pulses determines the volume of fluid dispensed. Alternatively, the pump is driven through increments of the second part of the cycle, with the number of pulses supplied to the pump determining the proportion of the second part of the cycle completed, and therefore the volume of fluid dispensed.

Abstract: An apparatus and method for dispensing a discrete volume of fluid. The apparatus includes a pump operable in discrete cycles, a power source connected to the pump, and a controller connected to at least one of the pump and the power source. The controller is configured to vary the power provided from the power source to the pump during at least a portion of each discrete cycle based on characteristics of the pump and the fluid. For example, the controller may vary power by controlling the duration of the provision of power, or by controlling the amplitude of the power. Varying the power is intended to improve the accuracy of the discrete volume of fluid dispensed. Correspondingly, the method of dispensing a discrete volume of fluid includes receiving information pertaining to the fluid to be dispensed, and adjusting a provision of power to a pump based on the information. The method may include adjusting the duration of the provision of power, or adjusting the amplitude of the provision of power.

Abstract: A fluid dispensing apparatus includes a pulse generator coupled to a pump that operates in discrete cycles. Each cycle includes a first part in which fluid is drawn into the pump through an inlet, and a second part in which fluid is expelled from the pump through an outlet. Each cycle results in a discrete, consistent volume of fluid being expelled. The pulse generator transmits discrete pulses to the pump, causing the pump to operate for a set number of cycles per pulse. The total number of cycles is a multiple of the number of pulses transmitted, so that the number of pulses determines the volume of fluid dispensed. Alternatively, the pump is driven through increments of the second part of the cycle, with the number of pulses supplied to the pump determining the proportion of the second part of the cycle completed, and therefore the volume of fluid dispensed.