ECE5320 Mechatronics Assignment#01: Literature Survey on Sensors and Actuators Topic: Dissolved Oxygen SensorsOutlineReference ListTo Explore Further (Survival Pointers of Web References Etc)Major ApplicationsMain ComponentsExample DiagramsMembrane SpecificationsElectrode Material ChoicesHow It WorksHow It Works (Cont)Two TypesGalvanicPolarographicMajor SpecificationsAccuracyAverage Response TimesMounting OptionsLocations for Possible UseLimitationsOptional FeaturesCleaning and MaintenanceWhere to BuyCost InformationECE5320 MechatronicsAssignment#01: Literature Survey on Sensors and Actuators Assignment#01: Literature Survey on Sensors and Actuators Topic: Dissolved Oxygen SensorsPrepared by:Kimball [email protected]/11/200501/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-2Outline –Reference list–To explore further–Major applications–Main components–How it works–Major specifications–Limitations–Pricing–Where to buy01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-3Reference List•Google.com•Globalspec.com•www.stevenswater.com•www.quantumanalytical.com/pdf/ATIq25d.pdf•www.mt.com•www.thermo.com•electrodesdirect.com•apcs.net01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-4To Explore Further (Survival Pointers of Web References Etc) •Globalspec.com requires user name and password that can be easily acquired.•All quotes for pricing requested through Globalspec.com01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-5Major Applications •Wastewater treatment •Wine production•Bio-reactions such as aquaculture and environmental testing •Ground water monitoring•Surface water monitoring01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-6Main Components•Thin organic membrane •Two or three metal electrodes•Thermistor thermometer•An electrolyte Solution•Outer shaft housing01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-7Example Diagramselectrodesdirect.com01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-8Membrane Specifications•Made of FEP ( fluorinated ethylene propylene)•Usually replaceable•Approximately 50 um01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-9Electrode Material Choices•Gold cathode, silver anode, silver/silver bromide•Lead anode and a gold cathode01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-10How It Works •Liquid goes into the sensor.•Oxygen diffuses through the membrane.•As oxygen gets diffused the electrolyte has higher pressure which raises the current through it.•Current is measured.•Converts the measurement of the current into units of concentration.01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-11How It Works (Cont)•Generates a signal that is proportional to the present amount of oxygen.•Can determine the quantity of dissolved oxygen as a percent saturation or simply as an amount.•Generally the medium is water but can be other liquids.01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-12Two Types•Galvanic•Polarographic01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-13Galvanic•No external voltage required.•More stable and accurate at lower levels of dissolved oxygen.•Lower maintenance cost since the components can go several months without needing replacement.01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-14Polarographic•External voltage required.•Higher maintenance cost since the components must recharged after every few weeks of being used heavily.•Two types: Ross or Clark.01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-15Major Specifications •Oxygen range•Accuracy•Response time•Minimum flow rate•Operating temperature range•Operating pressure range01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-16Accuracy•No zero point error•Very accurate normally better than +/- 0.2mg/L01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-17Average Response Times•10 seconds•15 – 20 seconds•60 seconds•90%•95%•100%01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-18Mounting Options•Hand held or portable•Flow Thru (Pipeline)•In-Line (Insertion)•Convertible•Other01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-19Locations for Possible Use• On the edge of a body of water like a lake or a river• The edge of a boat• In a stilling well away from the main flow of the water•Mounted inside a drainage pipe•On the wall of a dam•Anchored to bottom of a body of water01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-20Limitations •Certain temperatures or pressures•Flow rate of liquid too high•Maximum distance from the medium to be measured•Amount of dissolved oxygen too high or too low to be sensed.01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-21Optional Features•Disposable membrane cap•Temperature sensor built in•Compensation of temperature•Extension attachments•LCD display module01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-22Cleaning and Maintenance•Does not need to be cleaned if there is only a little grime •Easily cleaned using soap and water•Calibration should be done every three to six months•Replacement membranes are usually available01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-23Where to Buy•Extech Instruments Corp•Campbell Scientific, Inc.•Honeywell Sensing and Control •Situ, Inc.•Mettler-Toledo Thornton Inc. •Ocean Optics, Inc.•Thermo Electron, Water Analysis/Orion Products •Electro-Chemical Devices, Inc01/14/19ECE5320 Mechatronics. Assignment#1 Survey on sensors and actuatorsSlide-24Cost Information•$199 for glass body at Electrodes Direct•$399 for Heavy Duty version at Extech Instruments Corp•$667 for flow through mounted version at Electrodes Direct•$982 for stainless steel type at Electrodes
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