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Mass Flow Controller Mass Flow Controller SystemSystem
Client:Client:
Brad Hodgeman– Instrumentation Brad Hodgeman– Instrumentation Specialist, Comparative Specialist, Comparative
BiosciencesBiosciences
Advisor:Advisor:
Professor Emeritus John G. Professor Emeritus John G. WebsterWebster
Team Members:Team Members:
Aaron Huser, Cole Kreofsky, Dana Aaron Huser, Cole Kreofsky, Dana Nadler, Joe PoblockiNadler, Joe Poblocki
University of Wisconsin - MadisonUniversity of Wisconsin - MadisonBiomedical Engineering Design CoursesBiomedical Engineering Design CoursesINTELLECTUAL PROPERTY STATEMENTINTELLECTUAL PROPERTY STATEMENT
Problem MotivationProblem Motivation
Brad 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are too Current mass flow controllers are too inaccurate, and the software is inaccurate, and the software is outdated.outdated.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 There are undesirable, manual aspects to protocol that need to be aspects to protocol that need to be eliminated.eliminated.
Problem StatementProblem Statement
The purpose of this project is to design The purpose of this project is to design a system that can create a reproducible a 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.
BackgroundBackground
Hypoxia 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 Controllers
Mass 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 System
Computer controlled Command Computer controlled Command Module (HyperTerminal Software)Module (HyperTerminal Software)
Four Analog Mass Flow ControllersFour Analog Mass Flow Controllers Two Manual Mass Flow ControllersTwo Manual Mass Flow Controllers Four ChambersFour Chambers
Design ConstraintsDesign Constraints
Variable gas concentrations and flow Variable gas concentrations and flow rates through a chamberrates through a chamber
Software with an easy to use Software with an easy to use interface and customizable featuresinterface and customizable features
Accurate mass flow controllers, Accurate mass flow controllers, digital or analogdigital or analog
Uniform tubing resistanceUniform tubing resistance Low sound levelLow sound level Capability for further expansionCapability for further expansion
Software DevelopmentSoftware Development
LabVIEWLabVIEW Graphical programming Graphical programming
environment made for environment made for engineers and scientistsengineers and scientists
Client has had previous Client has had previous experience using experience using DASYLab – a program DASYLab – a program similar to LabVIEWsimilar to LabVIEW
Ability to customize Ability to customize programs easily and programs easily and efficientlyefficiently
Variety of open source Variety of open source examples of current examples of current programs availableprograms available
Main Areas of FocusMain Areas of Focus
Mass Flow Controller ManufacturersMass Flow Controller Manufacturers Sierra Instruments – Sierra Instruments – Series 100 Smart-Trak™Series 100 Smart-Trak™ Advanced Energy – Advanced Energy – Aera® Mach OneAera® Mach One Mykrolis – Mykrolis – Intelliflow ™ IIIntelliflow ™ II
Interface typesInterface types AnalogAnalog DigitalDigital
DeviceNetDeviceNet RS485RS485 RS232RS232
Manufacturer MatrixManufacturer Matrix
Company AccuracyResponse
Time PriceCustomer
Service Flow Range Total
Advanced 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) 16
Sierra Instruments
+/- 0.7% of reading + 0.3% fs (2) 2 sec (2)
$1370.00 US (4) (4) 6 L/min (4) 16
Low=1 - 5=High**The Numbers
Don't Lie!
Digital vs. AnalogDigital vs. Analog
DigitalDigital Accuracy is a Accuracy is a
function of set function of set point (sp)point (sp)
Multiple gas Multiple gas calibration curvescalibration curves
Multiple set point Multiple set point calibrationcalibration
More cost efficientMore cost efficient
AnalogAnalog Accuracy is a Accuracy is a
function of full function of full scale (fs)scale (fs)
Manual individual Manual individual gas calibrations gas calibrations
Digital InterfaceDigital Interface
DeviceNetDeviceNet Most ExpensiveMost Expensive Too sophisticated for this Too sophisticated for this
systemsystem
RS232RS232 Least ExpensiveLeast Expensive
Ergonomically incompatibleErgonomically incompatible
RS485RS485 Moderately ExpensiveModerately Expensive Ability to daisy-chain Ability to daisy-chain
cablescables
System DesignSystem DesignLabVIEW software, RS485 interface and AE MFCsLabVIEW software, RS485 interface and AE MFCs
QuestionsQuestions
Any Questions?Any Questions?