Peristaltic Pump Calibration Using Correction Coefficients
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Peristaltic pumps require frequent calibration due to mechanical stress on flexible tubes, leading to economic losses and inefficiencies, especially in applications requiring precision, as manual calibration methods waste fluid and are not accurate when conditions change.
Innovation Solution
An automated method for calibrating peristaltic pumps by pumping liquid into a calibration vessel, measuring the volume, and using correction coefficients stored in a control device to determine the calibrated volume per pumping cycle, allowing for precise adjustment and reuse of fluid, reducing waste and improving accuracy across varying operating conditions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If manual calibration is performed by measuring volume or mass flow rate at different pump speeds, then calibration data can be obtained, but significant fluid is wasted causing economic losses
Solution Approach 1:
The system uses feedback by measuring the actual volume pumped during calibration and using this information to calculate correction coefficients that adjust the pump's operational parameters. The calibration process itself provides feedback data that is used to improve future pumping accuracy without requiring additional fluid waste.
Solution Approach 2:
The patent performs preliminary calibration actions by determining correction coefficients during setup or maintenance phases rather than during every operational cycle. These pre-calculated coefficients are then applied during normal operation, eliminating the need for continuous fluid-wasting calibration measurements.
2Ease of operation
If calibration is performed under different conditions than operating conditions (e.g., open vessel vs closed vessel), then calibration can be completed, but the calibration accuracy decreases for actual operation
Solution Approach 1:
The system compensates for different calibration and operating conditions by introducing correction coefficients that adjust for parameter changes such as vessel type, fluid properties, temperature, and pressure. These coefficients mathematically bridge the gap between calibration conditions and actual operating conditions, maintaining accuracy despite convenience-driven calibration setup differences.
3Reliability
If the flexible tube is replaced frequently due to mechanical stress, then the pump can continue operating, but calibration must be repeated multiple times causing time loss and fluid waste
Solution Approach 1:
The system enables self-service by automatically calculating correction coefficients during calibration without requiring extensive manual intervention or repeated calibration cycles. The automated calculation and application of correction factors reduces the time and resources needed for recalibration after tube replacement, allowing the system to self-correct and minimize downtime.
4Measurement precision
If multiple calibrations are performed to maintain precision under varying operating conditions, then accuracy is maintained, but large amounts of time are lost and fluid is wasted
Solution Approach 1:
The system performs preliminary calibration to establish baseline correction coefficients that account for varying operating conditions. These pre-established coefficients are then applied across different operating scenarios, eliminating the need for multiple separate calibration events and maintaining productivity while preserving dose accuracy.
Solution Approach 2:
The correction coefficient system serves multiple functions: it calibrates the pump, compensates for tube wear, adjusts for different operating conditions, and maintains accuracy across various fluid properties. This multi-functional approach replaces multiple specialized calibration procedures with a single versatile calibration system.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The method enables precise calibration and operation of peristaltic pumps, minimizing fluid waste and economic losses by allowing automatic calibration and reuse of fluid, ensuring accuracy and efficiency throughout the pump's operating range.
Implementation Method 1
The rotation of the rotor and its respective rollers produces what is known as peristalsis, thus causing the fluid contained in the flexible tube or pipe to move forward.
Data Source
AI summary
A method is for calibrating a peristaltic pump, and for dispensing a quantity of liquid by a peristaltic pump. A device for producing sterile preparations can execute the methods.