Mass Flow Controller SystemUniversity of Wisconsin - Madison Biomedical Engineering Design Courses INTELLECTUAL PROPERTY STATEMENTProblem MotivationProblem StatementBackgroundMass Flow ControllersCurrent Gas Control SystemDesign ConstraintsSoftware DevelopmentMain Areas of FocusManufacturer MatrixDigital vs. AnalogDigital InterfaceSystem Design LabVIEW software, RS485 interface and AE MFCsQuestionsMass Flow Controller Mass Flow Controller SystemSystemClient:Client:Brad Hodgeman– Instrumentation Brad Hodgeman– Instrumentation Specialist, Comparative Specialist, Comparative BiosciencesBiosciencesAdvisor:Advisor:Professor Emeritus John G. Professor Emeritus John G. WebsterWebsterTeam Members:Team Members:Aaron Huser, Cole Kreofsky, Dana Aaron Huser, Cole Kreofsky, Dana Nadler, Joe PoblockiNadler, Joe PoblockiUniversity of Wisconsin - MadisonUniversity of Wisconsin - MadisonBiomedical Engineering Design CoursesBiomedical Engineering Design CoursesINTELLECTUAL PROPERTY STATEMENTINTELLECTUAL PROPERTY STATEMENTProblem MotivationProblem MotivationBrad Hodgeman researches hypoxia Brad Hodgeman researches hypoxia and hyperoxia with rats at the and hyperoxia with rats at the Veterinary Science Building.Veterinary Science Building.Current mass flow controllers are too Current mass flow controllers are too inaccurate, and the software is inaccurate, and the software is outdated.outdated.There are undesirable, manual aspects There are undesirable, manual aspects to protocol that need to be eliminated.to protocol that need to be eliminated.Problem StatementProblem StatementThe purpose of this project is to design a The purpose of this project is to design a system that can create a reproducible system that can create a reproducible and accurate hypoxic/hyperoxic and accurate hypoxic/hyperoxic environment with the capability of environment with the capability of oscillating between various oscillating between various concentrations of oxygen and nitrogen. concentrations of oxygen and nitrogen.BackgroundBackgroundHypoxia and hyperoxia are atmospheric Hypoxia and hyperoxia are atmospheric conditions, where the oxygen level conditions, where the oxygen level deviates below or above normal (21%) deviates below or above normal (21%) concentration, respectively. concentration, respectively. Hypoxia is a form of respiratory distress Hypoxia is a form of respiratory distress which induces certain physiological which induces certain physiological responses by the neuro-respiratory responses by the neuro-respiratory system. These responses have been system. These responses have been associated with SIDS, sleep disorders, associated with SIDS, sleep disorders, spinal cord injury, etc.spinal cord injury, etc.Mass Flow ControllersMass Flow ControllersMass flow Mass flow controllers often controllers often aid in hypoxia aid in hypoxia research due to research due to their ability to alter their ability to alter Oxygen Oxygen concentrations to concentrations to desirable levels for desirable levels for testable testable consequences.consequences.Current Gas Control SystemCurrent Gas Control SystemComputer controlled Command Computer controlled Command Module (HyperTerminal Software)Module (HyperTerminal Software)Four Analog Mass Flow ControllersFour Analog Mass Flow ControllersTwo Manual Mass Flow ControllersTwo Manual Mass Flow ControllersFour ChambersFour ChambersDesign ConstraintsDesign ConstraintsVariable gas concentrations and flow Variable gas concentrations and flow rates through a chamberrates through a chamberSoftware with an easy to use Software with an easy to use interface and customizable featuresinterface and customizable featuresAccurate mass flow controllers, digital Accurate mass flow controllers, digital or analogor analogUniform tubing resistanceUniform tubing resistanceLow sound levelLow sound levelCapability for further expansionCapability for further expansionSoftware DevelopmentSoftware DevelopmentLabVIEWLabVIEWGraphical programming Graphical programming environment made for environment made for engineers and scientistsengineers and scientistsClient has had previous Client has had previous experience using experience using DASYLab – a program DASYLab – a program similar to LabVIEWsimilar to LabVIEWAbility to customize Ability to customize programs easily and programs easily and efficientlyefficientlyVariety of open source Variety of open source examples of current examples of current programs availableprograms availableMain Areas of FocusMain Areas of FocusMass Flow Controller ManufacturersMass Flow Controller ManufacturersSierra Instruments – Sierra Instruments – Series 100 Smart-Trak™Series 100 Smart-Trak™Advanced Energy – Advanced Energy – Aera® Mach OneAera® Mach OneMykrolis – Mykrolis – Intelliflow ™ IIIntelliflow ™ IIInterface typesInterface typesAnalogAnalogDigitalDigitalDeviceNetDeviceNetRS485RS485RS232RS232Manufacturer MatrixManufacturer MatrixCompany AccuracyResponse Time PriceCustomer Service Flow Range TotalAdvanced Energy +/- 0.5% (4)<= 250 ms (5)$1675.00 US (3) (3) 3 L/min (2)17**Mykrolis+/- 0.25% sp plus 0.35% fs (3) 1 sec (3)$1880.00 US (2) (3) 5 /min (5)16Sierra Instruments +/- 0.7% of reading + 0.3% fs (2) 2 sec (2)$1370.00 US (4) (4) 6 L/min (4)16Low=1 - 5=High**The Numbers Don't Lie!Digital vs. AnalogDigital vs. AnalogDigitalDigitalAccuracy is a Accuracy is a function of set function of set point (sp)point (sp)Multiple gas Multiple gas calibration curvescalibration curvesMultiple set point Multiple set point calibrationcalibrationMore cost efficientMore cost efficientAnalogAnalogAccuracy is a Accuracy is a function of full function of full scale (fs)scale (fs)Manual individual Manual individual gas calibrations gas calibrationsDigital InterfaceDigital InterfaceDeviceNetDeviceNetMost ExpensiveMost ExpensiveToo sophisticated for this Too sophisticated for this systemsystemRS232RS232Least ExpensiveLeast ExpensiveErgonomically incompatibleErgonomically incompatible RS485RS485Moderately ExpensiveModerately ExpensiveAbility to daisy-chain Ability to daisy-chain cablescablesSystem DesignSystem DesignLabVIEW software, RS485 interface and AE MFCsLabVIEW software, RS485 interface and AE MFCsQuestionsQuestionsAny Questions?Any
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