Peristaltic pump having temperature-compensated volumetric delivery
AssigneeWaters Technologies Corporation
InventorsTimothy M. Raymond, Sean Eric Anderson
Life of this patent
Estimating the term…
Abstract
Described is a method for regulating a volume of liquid delivered by a peristaltic pump and a peristaltic pump system that can be used to perform the method. The method includes sensing an ambient temperature of the peristaltic pump. The peristaltic pump includes a pump motor. At least one of a motor speed and a motor operation duration is determined from the sensed temperature, a selected volume of liquid to be delivered and a predetermined correspondence of the motor speed to ambient temperature. The pump motor is operated at the determined motor speed or for the determined motor operation duration to deliver the selected volume of liquid from the peristaltic pump.
Claims15
A method for regulating a volume of liquid delivered by a peristaltic pump, the method comprising:
- sensing an ambient temperature of a peristaltic pump having a pump motor;
- determining one of a motor speed and a motor operation duration for the pump motor based on the sensed ambient temperature, a selected volume of liquid to deliver and a predetermined correspondence of the motor speed to the ambient temperature to produce a volumetric flow rate from the peristaltic pump, wherein the predetermined correspondence of the motor speed to the ambient temperature comprises previously acquired data indicating the motor speed used to produce the volumetric flow rate as a function of ambient temperature and as a function of a storage condition of the peristaltic pump;
- and
- operating the pump motor at the determined motor speed or motor operation duration to deliver the selected volume of liquid from the peristaltic pump.
A peristaltic pump system comprising:
- a peristaltic pump having a pump motor;
- a temperature sensor disposed in an ambient environment of the peristaltic pump;
- a memory module configured to store data defining a predetermined correspondence of a motor speed of the pump motor to the ambient temperature to produce a volumetric flow rate from the peristaltic pump;
- and
- a processor in communication with the peristaltic pump, the temperature sensor and the memory module, the processor configured to determine the motor speed or a motor operation duration that delivers a selected volume of liquid from the peristaltic pump based on a temperature sensed by the temperature sensor and the predetermined correspondence of the motor speed of the pump motor to the ambient temperature, wherein the predetermined correspondence of the motor speed to the ambient temperature comprises previously acquired data indicating the motor speed used to produce the volumetric flow rate as a function of ambient temperature and as a function of a storage condition of the peristaltic pump, the processor further configured to provide a control signal to the peristaltic pump to operate the pump motor at the determined motor speed or motor operation duration.
Dependencies are inferred from the claim text.