The peristaltic pump is primarily a positive displacement pump, utilized typically for pumping both aggressive and sterile fluids in a manner that prevents their contamination. This pump functions on the same basic principle as peristalsis, which is a natural event observed within living organisms – like the esophagus of humans.
The pump comprises several shoes, mostly two that compress flexible tubing along the edges of a circular pump casing. You will find that distance in-between the rotary shoes remains constant, if you for instance buy peristaltic pump having two shoes. The unchanging distance present between these two shoes generates the same proportion of vacuum for suction without regarding rpm of the shoe-rotating motor. The quantity of fluid encapsulated within the subsequent phase of vacuum generation varies proportionally to the generated vacuum. As such, flow rates of peristaltic pumps are clear-cut over three tube constrictions of sequential nature. Consistency of output flow rate for the pump facilitates its suitability for applications relating to metering and dosing.
Factors Affecting Flow Rate
Although the per-cycle pump output is indifferent to the motor’s rpm, the flow rate does vary in direct proportion to it. Variations in the motor’s rpm generate relevant change in terms of output flow rate. This may be shown by assembling a variable frequency drive or VFD within the peristaltic pump system. It is nonetheless necessary for rpm of motor to remain constant after the required flow rate is achieved. This is because metering applications require for an invariable flow rate across a protracted time-frame.
Metering Application and Characteristics of Performance
Peristaltic pumps are employed widely as metering pumps within the medical field owing to isolation of fluids during the pumping process. In general, accuracy of flow rate for peristaltic pumps ranges in-between ±0.25% and ±5%. These pumps are primarily applied for infusion of medicinal fluids due to their ability of infusing at even the low rate of 0.1 ml/hour. Slow infusions of such kind could prevent blood clots within the vein. Sensitive administrations of this nature require pressure guards to prevent air infusion occasioned by absence of source fluid. An optical gadget is utilized for detecting bubbles introduced within the system while pumping takes place. Working mechanism of such a peristaltic pump Australia merchants have available incorporates an anti-siphoning functionality, which makes them suitable for applications involving medical metering.