Metal Samples MS2500L Operator'S Manual Download Page 43 | Manualshive

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Metal Samples MS2500L Operator'S Manual Download Page 43

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Figure 6. Typical Behavior of Corrosion Rate as a Function of Process Variables

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Summary of Contents for MS2500L

Page 1: ...tter Operator s Manual Metal Samples Company A Division of Alabama Specialty Products Inc 152 Metal Samples Rd Munford AL 36268 Phone 256 358 4202 Fax 256 358 4515 E mail msc alspi com Internet www me...

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Page 3: ...8 A MS2510 Receiver Power Supply 8 B Probes and Electrodes 9 C Electrodes Normally Carried in Stock 10 D Probe Placement 11 E ProbeInstallation 11 F PAIRTM ProbeAssembly 12 V CircuitDescription 14 A I...

Page 4: ...InstrumentandLoopVerification 28 C ProbeElementTesting 28 D CurrentLoopIsolationTesting 29 AppendixA Drawings 30 AssemblyDrawings 31 InstallationDrawing 36 AppendixB PartsList 37 Appendix C Effects o...

Page 5: ...current loop transmitter for corrosion measurementsusingthethree electrode linearpolarizationtechnique LPR Functionally theMS2500L transmitteroperatesunderthesameprinciplesastheautomaticLPRinstruments...

Page 6: ...from the printed circuit cards for theireasyremoval Theprintedcircuitcardsrestinsliderailswithinthemountingbracket Oncetheterminalblocksare detached from the printed circuit cards the circuit cards sl...

Page 7: ...de is the normal operation mode or SAMPLE mode This mode is as the one described earlierwherethecurrentloopinformationisupdateduponthecompletionofameasurementcycle This isthelogicalchoiceofoperationwh...

Page 8: ...m Bolt Pattern with 1 4 20 Tapped Mounting Holes or May Be Mounted on a 1 2 to 2 1 27cm to 5 08cm Pipe Using Supplied Hardware OperatingTemperature 32 to 158 F 0 to 70 C StorageTemperature 32 to 158 F...

Page 9: ...iretype theinstalledcostofaninstallationisfarlessthanifthe analyzer is located in the control room and signal cables are run from the sensor to the analyzer Safe Thetransmitteritselfishousedinacompact...

Page 10: ...pendixAfor connecting these two instruments together See Section IVfor description and specifications of the MS2510 FrontPanel Two of the three positions on the front panel of the MS2510 are used with...

Page 11: ...tion switches to LPR and TRACK mode 4 Power up the loop and observe the loop current using a ammeter recorder etc The currentreadingwillchangeeverytwoseconds Thesereadingswillthenbegintosettle Dependi...

Page 12: ...milliamps and corrosion rate MPY Located at the back of the receiver are 4 20mAand 10Voutput terminals for connection of the receiver to a customer supplied computer data logger or recorder connection...

Page 13: ...rtantinobtainingaccuratecorrosionratereadings Basically aprobeissimplya means of mounting the three electrodes which are necessary to make the corrosion rate measurement andprovidesameansofelectricall...

Page 14: ...tainless Steel EL 634 304 Low Carbon Stainless Steel EL 635 316 Low Carbon Stainless Steel EL 640 Hastelloy3 B EL 641 HastelloyC EL 643 HatelloyN EL 651 Nickel 200 EL 652 Inconel4 600 EL 653 Inconel 6...

Page 15: ...rcent allnormalsurfacesofthesamemetalcontactedbytheinhibitorshould havetheircorrosionratessimilarlyreduced Usually aprobelocationisselectedtoreadonthehighsideof a system s average rate in order to acc...

Page 16: ...onsidered Probe inspection and electrode replacement can be made without system shutdown Effects of velocity can be checked bythrottlingofbypassvalves Theaboveisfurnishedasageneralguideline Theexistin...

Page 17: ...e thread lubricant Themildsteelelectrodeshavebeengivenasurfacepreparationtopermitfastestpossibleequilibriumto thesystem Anyforeignmaterialsuchasgrease oilorsweatwilldelayobtaininguniformreadings Shoul...

Page 18: ...es are used for several reasons 1 A power supply voltage of 25 volts or more can be supplied to overcome long cable drops or to fulfillpowerrequirementsfortheinstrumentation 2 The4milliamplivezeronoto...

Page 19: ...en sampled and a conversion factor is used to calculate the MPY value 5 5 A MPY 5 The polarization current is relaxed for the same duration after which the process can then be repeated The MS2500L ins...

Page 20: ...rcuitryfor Corrosionpotentialmeasurement Corrosionpotentialnullandhold 10millivoltprobepolarizationandreference Polarizationcurrentcontrol measurementandconversion TheA2Board containscircuitryfor Powe...

Page 21: ...2N2222 transistor Q2 in the feedback loop ofAR5 Aadds extra current drive AR6 contains a built in 200 millivolt reference and a power OP amp Together these are used to supply a 1 volt common source f...

Page 22: ...shedbyadigitalsampleandholdtechniquewithanindefiniteholding capability Ontheinitiationofapolarizationcycle apulsetriggersthestartofasuccessiveapproxima tion conversion performed by U4 and U5 U4 and U5...

Page 23: ...0 0 l 0 volt drop for a span of 0 100 MPY using the conversion factor of 5 5 MPY AR4 Ais used as a differential amplifier which converts the 0 1 volt drop across R11 to a 0 0 1 0 volt signal which is...

Page 24: ...d R25 network AR5 B senses this difference and biases Q1 until the current loop develops a 1 0 volt drop across R23 4mA At full scale output the sample and hold develops a 5 0 volt signal thus requiri...

Page 25: ...ct the negative lead to positive terminal of power supply Attach spare lead to negative terminal of power supply and other end to negative terminal of J3 J6 Note While making connections power supply...

Page 26: ...osition on J1 J5 and the negative to the B blue position on J1 J5 Set meter to read in the 20 mV range Set SW1 to the LPR position SW2 to the Sample SW3 to 0 SW4 to 0 and SW5 to 4 Turn off power suppl...

Page 27: ...l power to the instrument must be removed before opening cover The instrument was designed for easy board access and replacement in the field However it is recommended that all electrical tests be per...

Page 28: ...rt of the shield These two points are used for board interconnection of the instru mentground Itwillalsobenecessarytotemporarilyreplacethetwocontrolknobsbytighteningonly the two set screws used to bin...

Page 29: ...2 pin1 forthiscircuit Test voltage between J1 B and J1 Afor the 10 00 mVoffset during a polarization cycle If there is no offset then check the 200mV reference at AR3 pin 1 and the divider output at A...

Page 30: ...12 and the counters reloaded with the BCD value of the switch settings Check the control circuits U2 B outputs pin 13 and 12 will alternate between polarization mode and relaxation mode upon each cou...

Page 31: ...ard probe and loop current are at the same end and that no pins are bent while inserting Replace the shield after removing nuts and washers from switches Put screws back into boards and nuts and washe...

Page 32: ...s If the readings are correct the operation of the instrument and the current loop are correct If thereadingsareincorrect testthevoltageatthecurrentloopterminalsfortheminimumspecificationof 11 volts I...

Page 33: ...the 1K ohm resistor in both AC and DC modes on DVM In either mode there shouldbelessthan10millivoltstoindicateafloatingloop Repeatthetestusingthenegativesideofthe loop If the voltage drop is greater...

Page 34: ...30 Appendix A Drawings 1 Assembly Drawings A1 Board Overlays A2 Board Overlays Cable Assembly 2 Installation Drawings Physical Dimensions and Mounting Details Field Wiring...

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Page 40: ...37 Appendix B Parts List B 1 MS2500L...

Page 41: ...aggressive ion H and increasing the solubility of most potentially corrosive products 3 Oxygen Concentration Oxygen s role in corrosion is as an aggressive gas or oxidizing agent As its con centratio...

Page 42: ...ions is electroni cally conductive Since the Linear Polarization Technique assumes ionic conductiv ity between the electrodes this interferes with the measurements When significant amounts of FeS are...

Page 43: ...40 Figure 6 Typical Behavior of Corrosion Rate as a Function of ProcessVariables...

Page 44: ...hetransformationofhydrogenionstoatomichydrogenisanexample When reactions of these types occur they never occur in isolation only in pairs or combination In fact the oxidation process which produces mo...

Page 45: ...elikelytooccurthanironoxidation Fe Fe 2e E 0 44 volts which inturn ismorelikelythanhydrogenoxidation H2 2H 2e E 0 00 volts Someothergeneralizationsdrawnfromthestandardoxidationreductionpotentialtablea...

Page 46: ...n the series will be protected or corrode more slowly thanifitwereuncoupled Thetableshowswhyalloysofaluminumandmagnesiumaregalvanically coupled to steel to protect the steel Coupling steel to copper b...

Page 47: ...of any purchaser of Metal Samples prod ucts for breach of warranty and IS EXCLUSIVEAND IN LIEU OFALLOTHERWARRANTIES EXPRESSED IMPLIED OR STATUTORY INCLUDING THE IMPLIEDWARRANTIES OR MERCHANTABILITYAN...

Page 48: ..._________________ Company s Purchase Order for Original Sale_________________________ 3 ReturntheInstrumentto Company Name ________________________________________________ ____________________________...

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