![]() The resolution of the pump is dependent on the number of shoes (the distance between them. Peristaltic pumps can reliably deliver such a high degree of accuracy and precision. For example, considering the outlet flow, as the roller moves away from the tube it expands back from flat to its original shape. Peristaltic pumps are used for high-precision fluid dispensing, where the liquid to be dispensed is in the microliter range and the tolerances are in the nanoliter range. The flow of a peristaltic pump is interrupted as the rollers engage and disengage from the tube. Guides are available for different peristaltic pump tubes against a long list of media however, it is almost always recommended to perform a dynamic test with the tube installed in the peristaltic pump under the regular conditions of the application. For this reason, special thermoplastic elastomers have been developed as peristaltic pump tubing which remain highly elastic over a long operation life.3 Chemical CompatibilityThe final critical element to the choice of tube to be used in a peristaltic pump is chemical compatibility. If not designed for operation in a peristaltic pump, a tube will suffer fatigue as elasticity is lost, the tube will flatten and flow performance reduces. During this time, each part of the tube is compressed over 72 million times. Consider a peristaltic pump running at 300 rpm with 4 rollers for 6 weeks continuously.
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