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Theory of Operation 

OX-TRAN Model 2/22 Operator’s Manual 

 

D-2 

Revision R 

MOCON, Inc. 

Factors that Affect the Transmission Rate of a Barrier Material 

 

The oxygen transmission rate of barrier materials is affected by several factors: 

 

•

 

Barrier test temperature 

 

•

 

Test gas (oxygen) concentration effect on driving force 

 

•

 

Barometric pressure effect on driving force 

 

•

 

Relative humidity 

 

 

Barrier Temperature 

 

The temperature at which the barrier is tested has a great effect (usually logarithmic) on transmission rate. 

This makes temperature one of the most important test conditions for most barrier materials. Many barriers 

exhibit a 6% to 15% rise in oxygen transmission rate for each degree C rise in temperature. 

 

Test Gas Driving Force 

 

The driving force of the test gas has a direct effect on the oxygen transmission rate. The driving force of the 

test gas is affected by the oxygen concentration of the test gas and the ambient Barometric pressure. 

 

Barometric Pressure 

 

Barometric pressure has a proportional effect on the oxygen transmission rate of a specimen due to the 

increase/decrease in the density of the test gas.  

 

The instrument automatically compensates all transmission rate data to sea-level pressure (760 mmHg). 

 

Due to the wide potential variation in altitudes, reproducibility between laboratories may not be possible 

unless the transmission rate data is compensated to sea-level pressure. The instrument compensates all 

transmission rate data to sea-level pressure using the following ratio: 

 

pressure

 

barometric

 

Ambient

(760mmHg)

 

pressure

 

barometric

 

Standard

 

 

Relative Humidity 

 

The amount of water vapor some materials (such as nylon, cellophane and ethyl vinyl alcohol) are exposed 

to significantly affects the oxygen transmission rate of the barrier. The barrier properties of some of these 

materials can be permanently affected by prolonged exposures to significant amounts of water vapor. 

 

The OX-TRAN Model 2/22 provides the capability to test these types of materials in a controlled “wet” test 

environment. A Relative Humidity for the Test and Carrier gases between 0% and 90% RH can be 

specified. 

 

Содержание Mocon Ametek OX-TRAN 2/22

Страница 1: ...ut This Manual MOCON Inc Revision R i Revision R Part Number 143 195 OX TRAN Model 2 22 Operator s Manual Gas Detection Lauper Instruments AG Irisweg 16B CH 3280 Murten Tel 4126 672 30 50 info lauper...

Страница 2: ...ii Revision R MOCON Inc Trademarks Patents MOCON COULOX and OX TRAN are registered trademarks of Mocon Inc For information on applicable patents see https www ametekmocon com aboutus legal intellectu...

Страница 3: ...rks 1 Get an overview of the system See Chapter 1 Introduction on page 1 1 in this manual 2 Learn how the OX TRAN measures oxygen transmission See Appendix D Theory of Operation on page D 1 in this ma...

Страница 4: ...avoid plumbing contamination use only specified gas types at recommended operating pressures Use only HPLC grade water in the humidity generators Use care to avoid splashing the RH sensor with any sa...

Страница 5: ...er Gas Nitrogen 2 5 Gas Distribution Systems 2 5 Connecting the Gas Lines 2 6 Setting the Gas Supply Pressures 2 8 System Outgassing 2 8 Chapter 3 Preparing for a Test 3 1 Testing Basics 3 1 How Barri...

Страница 6: ...Plate 6 4 Mounting Pouches and Bags 6 5 Supplying a Test Gas 6 6 Using Ambient Air for the Test Gas 6 6 Using a Compressed Gas for the Test Gas 6 6 Setting Up and Starting a Package Test 6 8 Monitori...

Страница 7: ...ng Force D 2 Barometric Pressure D 2 Relative Humidity D 2 How a Humidified Test Gas is Generated D 3 How the ReZero Cell Works D 3 How the Auto Test Method Works D 4 How Sequential Testing Works D 4...

Страница 8: ...Gas 6 7 Figure 7 1 The Air Filter 7 2 Figure 7 2 Test Cell Components 7 4 Figure E 1 Plumbing Diagram Page 1 E 2 Figure E 2 Plumbing Diagram Page 2 E 3 Figure E 3 Electrical Diagram Page 1 E 4 Figure...

Страница 9: ...OX TRAN Model 2 22 Oxygen Transmission Rate System Read this chapter to get an overview of The features of the OX TRAN Model 2 22 system A summary of basic steps in a permeation test A summary of how...

Страница 10: ...omatic control of Pressure Flow and RH Automatic Barometric Pressure compensation Package Testing Adapter Optional Carrier Purge feature for package testing Fast changeover from Wet to Dry testing Adv...

Страница 11: ...eriod when used will occur at the beginning of each test phase ReZero State Periodically the instrument baseline must be measured so that any changes in the baseline will not affect the accuracy of yo...

Страница 12: ...of oxygen in the carrier gas is measured using the patented Coulox oxygen detector Seal leakage can be a significant source of error when measuring the transmission rate of a film sample The TruSeal f...

Страница 13: ...ructions Appendix A contain important information about preparing a location for the instrument and the facilities required for your new instrument Please read Appendix A before proceeding with the in...

Страница 14: ...2 Revision R MOCON Inc Front Panel Parts and Controls The names and locations of the parts and controls located on the front of the instrument are shown in Figure 2 1 Figure 2 2 and Table 2 1 Figure 2...

Страница 15: ...rawer where the Test Cell for Cell B is contained 9 Model H L ReZero Cell Vent The carrier gas vent for the ReZero cell Model 10x Cell A B ReZero Vent The carrier gas vent for Cell A Cell B and the Re...

Страница 16: ...Power Switch The switch that is used to turn the instrument on and off l is ON is OFF 4 Test Gas Inlet Port The fitting that connects the test gas supply to the instrument 5 Carrier Gas Inlet Port The...

Страница 17: ...drogen Regulator The tank fitting on a Hydrogen Regulator uses left hand threads The optional Regulator Assembly contains an approved Hydrogen Regulator A standard T size cylinder should provide suffi...

Страница 18: ...and ferrules The arrow on the Filter must point towards the tube connected to the instrument back panel 6 Connect the input on the Filter to the output fitting on a regulator tee using the 10 inch len...

Страница 19: ...tubing and two nuts and ferrules 6 Cut a piece of tubing to connect the regulator tee to the Test Gas cylinder regulator 7 Connect the Test Gas regulator tee to the Test Gas Oxygen supply regulator us...

Страница 20: ...en using compressed gas cylinders the tank must be replaced when the pressure falls below 300 psi on the first stage of the regulator System Outgassing Before the system can be used any air trapped in...

Страница 21: ...be tested may require changes to the test methodology Any sample with a transmission rate within the range of the instrument as specified in Chapter 9 can be tested Additional consideration is advised...

Страница 22: ...H anticipated before mounting the sample in the cell Developing Test Methods for your Films and Packages Choosing the appropriate test conditions and methodology is one of the most important preparato...

Страница 23: ...ll shifts in the baseline zero It may also be necessary to compensate for individual variations such as edge leaks in the test cells This is done with Individual Zero Processing During individual zero...

Страница 24: ...st parameters and an advanced dynamic convergence algorithm To perform a test the user just needs to enter the sample identification information and the standard test conditions Test Temperature and R...

Страница 25: ...voirs setting the initial test conditions and starting tests Many of the test conditions can be set automatically when the Auto Test function is used to start a test The operator has full control of a...

Страница 26: ...started the Home screen is automatically displayed in the workspace The application contains eighteen additional screens which are organized according to their primary function or task These functions...

Страница 27: ...in the day to day operation of your instrument Test duplicate samples whenever possible Use good samples Pinholes and creases can contribute to false readings Use caution when recording data for a ne...

Страница 28: ...foil mask should be used if any of these conditions exist You are testing a material with a transmission rate near or exceeding 200 cc m2 day such as polyethylene or polycarbonate If such materials ar...

Страница 29: ...and oxidation effects Homogeneous Materials If you are testing a homogeneous one layer sample the orientation of the sample in the cell is not critical Multi Layered and Laminated Materials Install a...

Страница 30: ...g 4 Push the end of the tubing onto the Fill Drain Port fitting 5 Open the appropriate Drain Fill Valve by turning it 2 3 turns counterclockwise 6 Slowly push in the plunger on the syringe to force th...

Страница 31: ...alve Carrier Gas The screw used to open close the Carrier Gas Drain Fill Valve 3 Reservoir Fill Line The maximum level to which the reservoir should be filled 4 Drain Fill Valve Test Gas The screw use...

Страница 32: ...refer to Figure 5 2 1 Remove the Test Cell from the instrument see Loading and Unloading the Test Cell 2 Separate the top part from bottom part of the cell and remove the old film sample 3 Clean the...

Страница 33: ...on the front of the instrument see Figure 2 1 2 Open the Cell Tray completely by gently pulling straight back from the front panel 3 Grasp the Test Cell by the front and back edges and lift straight...

Страница 34: ...ows the operator total control of all test parameters An Advanced Test method is setup and started by selecting the Test icon and paging to the Advanced Test screen using the arrow control located at...

Страница 35: ...ur instrument Test duplicate samples whenever possible Use good samples Poor sealing of packages to the test fixture and pin holes can contribute to false readings Use caution when recording data for...

Страница 36: ...e testing the film Test Cell must be replaced with the optional Package Adapter The tubing to the package fixture should be connected to the Package adapter before placing it into the Test Cell tray R...

Страница 37: ...avy the tubing may need to be extended Package Conditioning The barrier materials used in packages are generally thicker than films samples Thicker materials often require a longer time to condition t...

Страница 38: ...to allow the Carrier Gas to sweep the interior Mounting Bottles Cups and Trays using a Package Plate To mount a rigid or semi rigid package the package is inverted and the open side is sealed to the...

Страница 39: ...berally apply epoxy to the tubing at the points where the tubing enters the package Be careful not to seal off the ends of the tubing Five Minute Epoxy works well for this see Figure 6 3 3 Move the pa...

Страница 40: ...ing tubing that allows a Test Gas to purge the bag see Figure 6 5 Using Ambient Air for the Test Gas Using ambient air is the simplest way to supply a test gas The transmission data however will be af...

Страница 41: ...OX TRAN Model 2 22 Operator s Manual Testing Packages MOCON Inc Revision R 6 7 Figure 6 5 Supplying a Test Gas...

Страница 42: ...ows the operator total control of all test parameters An Advanced Test method is setup and started by selecting the Test icon and paging to the Advanced Test screen using the arrow control located at...

Страница 43: ...es Group Cleaning the Instrument The OX TRAN Model 2 22 is housed in a painted metal and plastic case that is easy to clean and maintain Periodically wipe the case with a damp cloth and mild detergent...

Страница 44: ...of dust If the filter is not cleaned on a regular basis air will not circulate properly through the cooling system The performance of the temperature control system for the Test Cells may be affected...

Страница 45: ...Nicks and scratches deep enough to feel may cause errors in the transmission rate due to leakage Drying Out the Humidifiers Before shutting down the instrument for long term storage or repair the Hum...

Страница 46: ...370 Figure 7 2 Test Cell Components Item Quantity Part Number Description 1 1 051 917 Fitting Adapter Push to Connect 5 32 OD Tube 2 1 051 719 Cell Diffusion Bottom OX 2 22 3 1 051 68 O Ring 3 739 ID...

Страница 47: ...sensor will take much longer to respond Usually a depleted sensor exhibits a reduction in efficiency and the measured values tend to read on the low side When you observe these symptoms the Coulox sen...

Страница 48: ...50 System Shutdown for Storage or Repair When shutting down the instrument for relocation long term storage or if the instrument is to be sent for factory repairs follow these instructions 1 End all a...

Страница 49: ...sages that may occur their cause and possible solutions please consult the Instrument Help System NOTE If you encounter an error message and are unable to resolve the problem write down both the error...

Страница 50: ...ells If you see a red Cell Status indicator on the front of the instrument the test has failed due to a gas sensor over range condition In addition to the red Cell Status indicator an error indicator...

Страница 51: ...ysical Specifications Environmental Requirements Temperature Operation 22 C 2 C Storage 10 C to 30 C Humidity Operation 20 to 80 RH non condensing Storage 5 to 85 RH non condensing Barometric Pressure...

Страница 52: ...22 PSI 1 52 Bar 152 kPa Flow Rate Nominal Test Active 80 cc minute Test Gas Gas Composition 100 Oxygen purity 99 9 Supply Pressure Nominal 25 PSI 1 72 Bar 172 kPa Supply Pressure Maximum 29 PSI 2 Bar...

Страница 53: ...ty 0 02 cc m2 day 0 0013 cc 100in2 day 0 0001 cc pkg day or 1 of value whichever is greater Table 9 6 Operational Capabilities Ox Tran 2 22 Model H Temperature Control Range 10 C to 40 C 0 2 C Time to...

Страница 54: ...s 0 to 90 RH 3 RH Humidity Control Film Cell Test Gas 0 to 90 RH 3 RH RH Film Cell to Cell Uniformity 3 RH Time to Reach Humidity Setting Approximately 3 hours to reach 99 of RH setting Test Range Fil...

Страница 55: ...OX TRAN Model 2 22 Operator s Manual Site Preparation Instructions MOCON Inc Revision R A 1 Appendix A Site Preparation Instructions See Next Page...

Страница 56: ...Hz Maximum power consumption for each instrument is 700 VA maximum surge The instrument must be provided with a quiet computer grade electrical circuit with an isolated ground and an appropriate groun...

Страница 57: ...t of electrical interference on the AC power lines These disturbances can interfere with the operation of the system unless steps are taken to isolate the power disturbances from the power lines servi...

Страница 58: ...N Inc The MOCON OX TRAN Model 2 22 system will provide years of useful life provided these requirements are observed Please contact MOCON in the USA at 763 493 6370 with any questions regarding these...

Страница 59: ...EA 030 802 Flask Erlenmeyer 250 ml Narrow Mouth Heavy Duty Rim 1 EA 030 803 Stopper RH Calibrator 1 EA 030 804 Stopper EPDM Red Tapered 70 Durometer 1 EA 034 285 Assy Package Mounting Fixture 5 X 5 1...

Страница 60: ...110 559 Assy Package Mounting Fixture 4 X 4 1 EA 110 671 Set Certified Film 2 22 Set of 3 1 EA 130 015 Mask Aluminum Foil 5 CM2 4 X 4 No Mounting Holes 10 EA 143 195 Manuscript OX Tran 2 22 On Flash D...

Страница 61: ...OX TRAN Model 2 22 Operator s Manual Warranty and Service Policies MOCON Inc Revision R C 1 Appendix C Warranty and Service Policies See Next Pages...

Страница 62: ...d representatives the warranty period is o One year from date of shipment from MOCON s factory for the Instrument o Coulox and IR Sensors in the following Instruments have an extended warranty as defi...

Страница 63: ...bor loss of use loss of profits or for any other indirect incidental collateral exemplary punitive consequential or special damages or losses arising out of the purchase of the Product and or out of t...

Страница 64: ...ur premises are free of charge subject to warranty restrictions PART REPLACEMENT If a local service representative is not available in country and if a defective part can be determined by the Customer...

Страница 65: ...that repairs are required after the warranty period the Purchaser again has several alternatives PREVENTIVE MAINTENANCE CONTRACT Preventive maintenance contracts are available MOCON recommends the in...

Страница 66: ...l be billed separately MOCON insures all shipments unless advised otherwise All repairs after the original instrument warranty period are warranted for 90 days on parts and labor EXW MOCON factory Ple...

Страница 67: ...ed each oxygen molecule entering the sensor results in four free electrons creating an electrical current One mole of oxygen 22 4 liters at 0 C and 760 mmHg would produce four Faradays of current Beca...

Страница 68: ...Pressure Barometric pressure has a proportional effect on the oxygen transmission rate of a specimen due to the increase decrease in the density of the test gas The instrument automatically compensate...

Страница 69: ...to permeation through the barrier material and all other sources of oxygen ingress This includes the system baseline If the system baseline can be measured subtracting it from the apparent transmissi...

Страница 70: ...ame manner as used for the Test Phase When included the Individual Zero Phase will always be performed after the Test Phase Completed Auto Test Methods will contain a log showing the changes in the dy...

Страница 71: ...tor s Manual Preparing RH Calibration Standards MOCON Inc Revision R E 1 Appendix E Electrical and Plumbing Diagrams Title Part Number Plumbing Diagram OX TRAN Model 2 22 051 942 Electrical Diagram OX...

Страница 72: ...Preparing RH Calibration Standards OX TRAN Model 2 22 Operator s Manual E 2 Revision R MOCON Inc Figure E 1 Plumbing Diagram Page 1...

Страница 73: ...OX TRAN Model 2 22 Operator s Manual Preparing RH Calibration Standards MOCON Inc Revision R E 3 Figure E 2 Plumbing Diagram Page 2...

Страница 74: ...Preparing RH Calibration Standards OX TRAN Model 2 22 Operator s Manual E 4 Revision R MOCON Inc Figure E 3 Electrical Diagram Page 1...

Страница 75: ...OX TRAN Model 2 22 Operator s Manual Preparing RH Calibration Standards MOCON Inc Revision R E 5 Figure E 4 Electrical Diagram Page 2...

Страница 76: ...Preparing RH Calibration Standards OX TRAN Model 2 22 Operator s Manual E 6 Revision R MOCON Inc Figure E 5 Electrical Diagram Page 3...

Страница 77: ...n can result in frostbite or burn injuries Salt solutions should be prepared only by qualified people with proper safety equipment RH sensor calibration will be performed at a specific temperature A s...

Страница 78: ...o come to equilibrium at the desired temperature before use Preparing a Low Level Calibration Standard A Low Level RH Calibration standard can be prepared using a molecular sieve as follows 1 Thorough...

Страница 79: ...Adjustment function or use of an inadequate transmission rate reference material Permeant Sensor Performance Check The accuracy of the oxygen sensor can only be checked by using a film to generate a r...

Страница 80: ...eference film or a certified film use the following procedure NOTE Mocon has available Certified NIST Films that cover the usual testing range Call MOCON in the USA at 763 493 6370 for more informatio...

Страница 81: ...If using another film set the Package Film buttons to the appropriate selection for the method used to establish the reference transmission rate Area Cell Verify the area is set correctly when not usi...

Страница 82: ...TR Adjustment screen Refer to the Instrument Help System for more information on performing an adjustment NOTE Calibration films should be stored in a manner that will keep them clean and free from wr...

Страница 83: ...OX TRAN Model 2 22 Operator s Manual Compliance MOCON Inc Revision R H 1 Appendix H Compliance...

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