초록 ▼

A peristaltic pump controller provides control of a positive displacement pump as either an uncalibrated or calibrated flowmeter, or a calibrated dispenser. A calibration constant is calculated, after the pump is primed, to determine the amount of volume output produced by an increment of angular ro

A peristaltic pump controller provides control of a positive displacement pump as either an uncalibrated or calibrated flowmeter, or a calibrated dispenser. A calibration constant is calculated, after the pump is primed, to determine the amount of volume output produced by an increment of angular rotation of the pump. The constant is determined during a calibration operation where an arbitrary calibration volume is metered. The controller has a low flow and high flow mode where the low flow mode provides a higher resolution for dispensing. The flow mode of operation is determined by the value of the calibration constant and is automatically set when the constant is calculated. DUring a dispensing operation, the controller will meter fluid to within a predetermined amount of the final volume dependent upon the speed of the pump motor and then dribble in the remaining amount of a batch for precision.

대표청구항 ▼

A calibration method for a positive displacement pump used as a flowmeter comprising the steps of: measuring an arbitrary calibration volume between starting and stopping operation, of said pump storing a number representative of increments of angular rotation of the pump during said pump operation,

A calibration method for a positive displacement pump used as a flowmeter comprising the steps of: measuring an arbitrary calibration volume between starting and stopping operation, of said pump storing a number representative of increments of angular rotation of the pump during said pump operation, and dividing the stored number by said measured volume to yield a calibration constant in units of increments of angular rotation per unit volume; thereafter counting the number of times a number of increments of angular rotation of the pump during said pump operation equal to said calibration constant occur using a flow volume accumulator counter, and displaying a number taken from said flow volume accumulator counter as a measure of how many units of fluid have flowed through said pump during said pump operation.