MS1500L manual (revised 4-7
Contents
1. 0 2096 Carbon Steel 0 35 Carbon Steel 0 396 Carbon Steel 0 2596 Carbon Steel 0 396 Carbon Steel 0 18 Carbon Steel 196 Cr 0 2 Mo Steel 596 Cr 0 596 Mo Steel 996 Cr 1 096 Mo Steel 1896 Cr 896 Ni S S 1896 Cr 896 Ni Low Carbon S S 18 Cr 10 Ni 3 Mo S S Low Carbon S S Ti Stabilized 18 8 S S 1296 Cr S S 1796 Cr S S UNS 531200 531803 11000 26000 28000 23000 63000 68700 44300 70690 71590 N04400 N08825 N06600 N06625 N10001 N10002 N10276 02201 08904 213001 R05200 R50250 R60701 A96061 Alloy Const 1 0 1 0 2 0 1 8 1 8 1 9 1 9 1 9 1 8 1 9 1 6 1 2 1 0 1 0 1 0 1 0 1 0 1 0 0 9 1 0 1 3 0 6 0 7 1 0 0 9 Alternate Designation ASTM A182 ASTM A276 AMS 4500 AMS 4505 ASME SB111 ASME B16 22 AMS 4640 ASME SB111 ASME B111 ASTM F96 ASTM F96 AMS 4544 ASME B163 AMS 5540 AMS 5401 AMS 5396 AMS 5388 ASME B366 AMS 5553 ASME B625 ASTM B6 ASTM B364 365 ASTM F67 ASTM B493 6061 58 Major Constituents or common names 26 Cr 6 Ni Duplex SS 22 Cr 5 Ni 3 Mo Duplex S S 99 90 Copper 70 30 Brass Muntz Metal 6096 Cu 85 15 Brass Aluminum Bronze Aluminum Brass Arsenical Admiralty Brass 90 10 Copper Nickel 70 30 Copper Nickel Monel 400 Incoloy 825 Inconel 600 Inconel 625 Hastelloy B Hastelloy C Hastelloy C 276 Nickel 201 23 1 4 25 Cr Cu Mo Ni 99 990 Zinc Tantalum Titanium Zirconium Aluminum Table of Equivalent Weig2. Metal Samples ER and LPR data logger instruments The Data Analysis utility can be opened from the Main Menu or it can be opened directly from the Instrument Download Center If the Data Analysis utility is opened from the Instrument Down load Center the contents of the data window will be loaded into the chart However if the Data Analysis utility is opened directly from the Main Menu a valid data file must be loaded The Select File box will open to allow selection of a data file 36 Loading a Data File After selecting a data file or clicking the Chart Data button from the Instrument Download Center a status window will display the progress of the file being opened along with the Instrument Type Probe Type and Probe ID for the data file 2 Opening Data File x Progress Instrument Type MS1500E Probe Type Wire Loop Probe ID 1000 CANCEL Data Table After a file has been successfully loaded the data will be displayed in the Data Table for review By default all data points will be included in the chart However data points can be turned off or excluded from the chart If the Excluded flag appears in the status column for a data point that data point will not appear in the chart To toggle the exclude include status of a data point double click the data point or select the data point and click Exclude Include in the Options menu PROBE Wire Loop Wie Loop Wite Loop Wie L
3. selected 2 Enter New Probe Whenever a new probe location is to be monitored the user will need to enter a unique probe I D number an instruction as to measurement type and an alloy designation code To do this select ENTER NEW PROBE from the initial screen of the sub menu using the cursor and arrow key and activate the option with the ENTER key This will initiate the following screen sequence PROBE ID UP ARROW WHEN DONE PROBE ID 4 ARROW PROBE ALREADY EXISTS PROBE ID XXXX ENTER TO DELETE ALL UNS NUMBER OLD PROBE READINGS USE ARROW KEYS _ ENTER UP ARROW ALLOY CONST EXIT PROBE ID XXXX ALREADY STORED 2 0022 UNS NUMBER LXXXXX IN MEMORY SELECT PROBE ID pipe zx MAKE MEASUREMENT uA DONE RECALL READINGS DELETE READINGS AUTO UNS CONST TABLE COMMUNICATIONS SET TIME AND DATE PROBE ID 4 UNS NUMBER LXXXXX MEASUREMENT LPR3A USE ARROW KEY GALV ENTER POT PROBE D UNS NUMBER LXXXXX TIME CYCLE OS MIN USE ARROW KEY PROBE ID 444 UNS NUMBER LXXXX ENTER MEASURMENT GALV ENTER TO ACCEPT ENTER PROBE ID XXXX EXIT UNS NUMBER LXXXXX LPR3A 5 MIN CYCLE ENTER TO ACCEPT 15 The initial screen allows the user to insert a probe 1 0 of up to four digits using the keyboard numbers When the ap
4. NO UNS ID LXXXXX UP ARROW WHEN DONE UP ARROW v WARNING UNS ID LXXXXX DELETE UNS CONST ENTER YES EXIT NO gt ENTER NEW UNS DELETE UNS v UNS NO USE ARROW KEYS ENTER INITIAL LETTER UNS NO LXXXXX UP ARROW WHEN DONE UP ARROW UNS NO LXXXXX ALLOY CONST X X ENTER ALLOY CONST ENTER v UNS NO LXXXXX ALLOY CONST X X ENTER TO ACCEPT v SELECT PROBE ID MAKE MEASUREMENT RECALL READINGS DELETE READINGS UNS CONST TABLE COMMUNICATONS SET TIME AND DATE 30 The first screen of the UNS CONST TABLE submenu offers two options ENTER NEW UNS and DELETE UNS Either of these options can be selected using the cursor in conjunction with the ARROW keys followed by the ENTER key If the ENTER NEW UNS option is selected the second screen will request the UNS number The user should select the initial letter of the UNS number using the ARROW keys to scroll and the ENTER key This will activate the third screen that allows the user to enter the five digits using the keyboard and confirm entry with the UP ARROW key The forth screen is now activated and the user should enter the alloy constant one integer and first decimal followed by the ENTER key confirmation This will activate a final screen showing the UNS number and alloy code which the user should confirm using the ENTER key At this point the user may also use the EXIT key if the UNS number or alloy code is incorrect E
5. S1VH NOISOHNOD IVILN3 LOd SINVATYS 3001203 13 33HHl 38008103 13 33HHl B Instrument Parts List The MS1500L comprises the following items Part No Oty Description M 7500 M 1 Operations Manual IN1500L 3 1 Meter Prover ETO352 1 Serial Port Cable 1500 3 1 9 Serial Port Adapter IN1500L 5 1 6 Pin Cable to 5 Pin Probe Adapter MS1500L 1 Instrument IN1500L 2 1 Instrument Carrying Case B 8400 B 1 9 Volt Battery The user should check upon receipt that the above accessories are included with the MS1500L unit Any shortage should be reported immediately to Metal Samples Company 152 Metal Samples Rd Munford AL 36268 Phone 256 358 4202 Fax 256 358 4515 E mail msc alspi com C Specifications Model MS1500L Handheld LPR Corrosion Data Logger Ordering IN1500L Physical Data Instrument Weight Total Weight w Carrying Case and Accessories Instrument Dimensions Carrying Case Dimensions Operating Temperature Storage Temperature Performance Data 1 4 Ib 0 64 Kg 5 26 Ib 2 39 Kg 7 63 H x 4 15 W x 2 0 D 19 38cm x 10 54cm x 5 08cm 10 H x 11 75 W x 5 4 D 25 40cm x 29 85cm x13 72cm 32 to 122 0 to 50 4 to 158 F 20 to 70 Measurement Range Resolution 2 Electrode 0 to 200 0 01 mpy 3 Electrode O to 200 mpy 0 01 mpy Galvanic 999 1pA Potential 999 mV 1mV Electrical Data Power Requirements Maximum Probe Ca
6. cancel a calculation click Cancel Calculate from the Tools menu or simply press the Esc key 41 Ill Theory of Operation Overview of Linear Polarization When a metal alloy electrode is immersed in an electrolytically conducting liquid of sufficient oxidizing power it will corrode by an electrochemical mechanism This process involves two simul taneous complementary reactions At anodic sites metal will pass from the solid surface into the adjacent solution and in so doing leave a surplus of electrons at the metal surface The excess electrons will flow to nearby sites designated cathodic sites at which they will be consumed by oxidizing species from the corrosive liquid A simple example of iron dissolving in acidic solution is illustrated below SOLID METAL CORROSIVE SOLUTION 4 Fe 2 CATHODIC H SITE oc H Fe Fe 2e 2 2e 42 This electron flow or movement of electric charge constitutes an electric current Ico Since the flow of electric current in such a situation can be equated to loss of metal mass or volume by Faradays Laws is a measure of corrosion rate The relationship of to corrosion rate is shown in Equation 1 Co duh e E yp 1 corrosion current surface area of metal alloy cm no ofsecond in 1 year 31 536 000 Faraday s constant 96 494 coulombs g
7. chart type can be set to Line Chart Bar Chart or Area Chart by selecting the appropriate button in the Chart Type box The default chart type is Line Chart Data Series Color Data Series Color displays a color selection box which allows the user to select the brush color for the plot line The default color for the plot line is Blue O Zoom In Zoom In allows a region of the chart to be enlarged so that it may be viewed in greater detail To enlarge a region of the chart click on the two data points that define the left and right boundaries of the region In zoom mode the mouse pointer will change to a cross hair When zoom mode ends the mouse pointer will re turn to its normal state To cancel zoom mode click Cancel Zoom In from the Tools menu or simply press the Esc key 40 O Zoom Out Zoom Out restores the initial view of the chart which dis plays the full data set O Calculate Corrosion Rate If the chart contains ER data the Calculate Corrosion Rate option will become available under the Tools menu This option allows the corrosion rate to be calculated between any two data points on the chart To calculate the corro sion rate click Calculate Corrosion Rate then click two data points The corrosion rate between those two data points will be displayed In calculate mode the mouse pointer will change to an arrow question mark When calculate mode ends the mouse pointer will return to its normal state To
8. inhibitor film persistency inhibitor mechanisms cathodic protection criteria as well as providing an alternative means to measure the onset of pitting a crevice attack and conjoint action failure phenomena e g stress cracking All measurements made with the MS1500L may be stored in the onboard memory that will hold as many as 3000 readings from up to 100 individual probes All stored data may be called to the instrument screen and reviewed at any time A backup battery will hold all data stored in memory for up to 12 months in event of failure of the main instrument battery Data may be selectively deleted from memory to accommodate additional information once the 3000 reading capacity is reached Alternatively information may be downloaded to a PC as a comma delimited ASCII file for import into any of the standard data analysis spreadsheet program such as Microsoft Excel In addition to its measurements function the MS1500L may be used as a data collection and transfer terminal for Metal Samples MS3500L remote LPR data logger In this capacity the accumulated data from several MS3500L field based units may be locally downloaded to the portable MS1500L and transferred to a PC for further analysis suonounj 1uaujaJnsea N 100STSIA Ha3l ndWOo5 TIVILN3LOd XOQ33 SS3H9NI N39AXO XAQANI ONILLId IVILN3LOd NOISOHNHOOD MOVLIV 217171513119 S31VH NOISOHNHOD
9. on the required probe I D The probe is then selected and the user will be returned to the main function menu from which the user may enter the MAKE MEASUREMENT submenu to measure the selected probe Unless the instrument is switched off or a new probe I D selection is made the probe remains selected and any number of measurements may be made with out re selection If the probe to be measured is a new probe without an I D in memory the user must enter a probe 1 0 see Enter New Probe p 15 Upon completion of the ENTER NEW PROBE sequence the user is automatically returned to the main function menu the new probe automatically has been selected and measurements may be made by selecting the MAKE MEASUREMENT submenu As with an existing probe a new probe may be subjected to as many measurement cycles as desired without re selection provided the instrument is not switched off Once a new or existing probe has been selected the make measurement sequence may be entered from the main function menu using the cursor ARROW keys and the ENTER instruction This will initiate the screen sequence shown on the next page 22 PROBE ID XXXX UNS NUMBER XXXXXX MEASUREMENT XXXXX GALV PROBE ID XXXX PRESS ENTER TO START CURRENT X XXXMA POT VENTER PRESS ENTER TO SAVE PROBE ID XXX TIME CYCLE X MIN PLEASE WAIT PROBE ID XXXX POTENTIAL LPR3 LPR2 PRESS ENTE
10. the user may employ the EXIT key to return to the main function screen re access the ENTER PROBE I D menu and correct errors in the probe I D Once a probe I D is entered it will be stored and can be re accessed at a future date directly from the list of probe D s given on the first screen of the SELECT PROBE 1 0 menu The probe 1 0 will be retained until the user deletes it or downloads the information for that probe I D to a computer 3 Delete Probe The second option listed in the first screen of the SELECT PROBE 1 0 sub menu is DELETE PROBE This is a convenient alternative for deleting unwanted or obsolete probe data from the instrument memory Probe data may also be deleted using the main function DELETE READING see Delete Readings p 27 Deletion using the ENTER PROBE 1 0 route can be selected using the cursor ARROW keys and the ENTER key The following screen sequence will be activated 19 DELETE PROBE PROBEID 00 UP ARROW WHEN DONE UP ARROW WARNING PROBE ID XXXX DELETE ALL READINGS ENTER YES EXIT NO PROBE ID XXXX DELETE READINGS EXIT PROBE ID XXXX UPDATING PROBE LIST gt SELECT PROBE I D MAKE MEASUREMENT RECALL READINGS DELETE READINGS UNS CONST TABLE COMMUNICATIONS SET TIME amp DATE 20 The user should scan the list of probe I D s to identify and memorize the probe 0 to be deleted since thi
11. the value of any data point can be determined by simply clicking it The value will be displayed in the charts tool tip box a small text box that is displayed near the mouse pointer If the tool tip box does not appear immediately after clicking the data point hold the mouse pointer stationary over the chart back ground for a moment The Tools Menu The Tools menu contains a collection of utilities for viewing and manipulating the chart The Tools menu can be accessed by clicking 700 5 on the menu bar or by right clicking anywhere on the chart Hide Data Markers Show Mean Value Show Trend Line Title Footnote Setup Plot Setup Data Series Color 2 ggg ES Zoom In Zoom Qut F6 Calculate Corrosion Rate F7 o Data Markers Show Data Markers toggles the data markers on and off o Mean Value Show Mean Value toggles the mean value line on and off O Trend Line Show Trend Line toggles the trend line on and off 39 Title Footnote Setup Title Footnote Setup displays a window that allows the chart title and footnotes to be toggled on and off and to be modified O Plot Setup Plot Setup displays a window that allows configuration of Y axis scaling and of the chart type The Y axis can be scaled to default values by checking the Auto Scaling option box The Y axis can be scaled to manual values by un checking the Auto Scaling box then entering the desired values in the Minimum and Maximum fields The
12. used to account for variations in E d from metal to metal this is preprogrammed into the measure ment by menu selection of alloy constant 46 An additional factor that is displayed is the so called pitting index This is in fact the ratio of the forward and reverse polarizing currents 1 1 Some manufacturers claim that this value gives some indication of the pitting characteristics of the system Metal Samples cautions the user to interpret the pitting index with considerable skepticism This value merely indicates some form of asymmetry between the two electrodes of which pitting is on manifestation of many Some other possible sources of asymmetric polarization are non uniform flow characteristics or scale deposition small differences in electrode composition or presence of surface inclusions and variations in electrode surface roughness Although the two electrode measurement is electronically simple and allows the use of comparatively small sensors it does have a serious limitation No means is incorporated into this technique to allow for solution resistance errors For solutions of significant resistance the polarizing voltage AE is partially dropped across the solution resistance R Consequently the amount of polarizing voltage used to measure the polarization resistance is lower than that anticipated This can be quantified as follows AE BIBS ABS 6 In effect the true corrosion rate is under esti
13. 0 6 47 97 48 09 47 40 29 35 18 58 23 77 53 2 97 55 48 80 39 1 Table of Equivalent Weights continued Name Promethium Radium Rhenium Rhodium Rubidium Ruthenium Samarium Scandium Selenium Silver Sodium Strontium Tantalum Technetium Tellurium Terbium Thallium Thorium Thulium Tin Stannum Titanium Tungsten Uranium Vanadium Ytterbium Symbol Praserodymium Pr Pm Ra Re Rh Rb Ru Sm Sc Se Ag Na Sr Ta Tc Te Tb TI Th Tm Sn Ti W U V Yb 140 92 145 226 186 22 102 91 85 48 101 1 150 35 44 96 78 96 107 87 22 99 87 23 180 95 97 127 61 158 93 204 39 232 168 94 118 70 47 90 183 86 238 07 50 95 173 04 Atomic Wt 61 Valence 3 N U L BN N BP A A PRP e Equivalent Wt 46 97 48 33 113 46 55 34 30 85 48 33 7 75 17 14 98 107 9 22 99 43 81 36 19 16 16 42 53 52 97 204 39 58 0 56 31 59 35 11 97 45 96 59 51 25 47 86 52 Appendix 2 Returning an Instrument for Repair If it is necessary to return any Metal Samples instrument for repair the following procedure is recommended to ensure the fastest possible repair and return cycle You may contact Metal Samples to verify that returning the instrument is necessary 1 If possible pack the instrument in the original shipping carton If the original carton is not available pack the instrument in a rigid cardboard or wood carton Sur rou
14. 00 Downloading Data To toggle the selected port on and off click the Download button Toggling the port on and off will also clear the data window Once a valid serial port and instrument have been selected click the Download button to turn the port on and enable the com puter to receive data If a valid serial port has been selected the status bar at the bottom of the window will display the message Port Status On If an invalid serial port has been selected an error message will appear and the status bar will display the mes sage Port Status Off If this happens another serial port should be selected 35 Saving Data To save the data in the data window click the Save button The data is comma delimited ASCII text It can be saved to a standard text txt file or it can be saved to a comma separated values csv file which greatly simplifies the process of importing the data into a spreadsheet program such as Excel Printing Data To print the contents of the data window click the Print button A print dialog box will be displayed to allow printer selection and setup Charting Data To chart the contents of the data window click the Chart Data button If the data has not yet been saved the user will be prompted to do so before the charting process begins For more information on charting data see the Data Analysis section Data Analysis The Data Analysis utility is a convenient tool for charting data from
15. 45 65 fitting It is designed for direct connection to any standard electrochemical probe manufactured by Metal Samples see illustration below PROBE CABLE CONNECTOR MS1500L PROBE CONNECTOR 2 ELECTRODE PROBE Figure 4 Conventional Probe Instrument Connection The IN1500L 5 6 to 5 pin adapter is a special adapter designed to mate with all two or three electrode probes that use a five pin connector instead of the conventional six pin connector ae 9 9 On Fo 40 N o mem 15001 5 Ex 6 TO 5 PIN ADAPTER SUPPLIED 3 ELECTRODE PROBE 2 ELECTRODE PROBE Figure 5 Adapter Connection for 2 or 3 Electrode Probes The user may from time to time encounter probes with a non standard probe connection especially if the probes are of a non commercial variety To account for this possibility the 15001 4 cable adapter is available This comprises a conventional six pin connector attached to a cable with leads terminated in alligator clips This allows for individual terminations to be made to any non conventional probe provided the probe connector pin out is known If the user is unfamiliar with the pin out on any particular probe this can be established prior to probe installation by performing a simple continuity check between the probe electrodes and the probe connector pins Instrumentation Operation A Start Up and Operations Overview Hav
16. D Metal samples MS1500L LPR Data Logger 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 metalsamples com Table of Contents 1 A Instrument Function Overview 1 B Instrument Parts 5 1 4 SpecifiCatiOhs s rine eren erroe nego 5 D Battery Installation 6 E Computer Download 7 F Adapter 05 8 Instrument Operation eene 10 A Start Up and Operations Overview 10 B Select Probe 14 1 General rte eei edis 14 2 Enter New 15 3 Delete 19 C Make Meas telmehl 22 D Recall readings 2 2 25 E Delete readings 27 UNS Constant 29 1 oras va 29 2 Addition Deletion of UNS Codes 30 Communications 32 Theory of OBBFaU Ort 2 42 Testing the MS1500L with the LPR Meter Pr
17. R AUTOMATIC UP ARROW WHEN DONE ARROW DELETE READINGS DELETE READINGS SX DD MM YR m DD MM YR DD MM YR 4 DD MM YR PLEASE WAIT ENTER TO DELETE The first screen of the sub menu requires the user to insert the reading number at which the deletion process should start For example if the user wishes to delete the first 50 readings the number 1 will be the reading number at which deletion starts Once the appropriate number is entered the UP ARROW will take the user to the new sub menu screen 27 This second screen displays the reading number at which dele tion is to start together with the date of this reading displayed in European format The screen also requests the process is to stop Once the number of the final reading to be deleted is entered the ARROW will then display an action confirmation screen This action confirmation screen shows the user both the initial and final ending number in the deletion sequence together with the date of each reading If the user wishes to proceed with deletion the enter key is used and after a short waiting period the dele tion is complete At this point the screen automatically reverts to the main function screen and the selected readings have been deleted Should the user not wish to proceed with deletion the user should press the EXIT key returning automatically to the main function screen without del
18. R TO SAVE PROBE ID XXXX ENTER EXIT PROBE Ip XXXX COR RATE XX XX MPY COR RATE XX XX MPY PIT INDEX X X PRESS ENTER TO SAVE PRESS ENTER TO SAVE i ENTER EXIT SELECT PROBE ID MAKE MEASUREMENT RECALL READINGS DELETE READINGS UNS CONST TABLE COMMUNICATIONS SET TIME AND DATE The first screen of the MAKE MEASUREMENT submenu displays the probe ID UNS code and measurement type If this is correct the user should use the enter key to start the measurement cycle If the probe ID is incorrect the user should use the EXIT key to return to the main menu and then enter the SELECT PROBE 1 0 submenu to select the correct probe I D If the measurement type is galvanic or potential after initiation with the enter key the measurement will be completed in less than fifteen seconds The screen showing the measurement value will appear displaying either probe I D and current expressed milliamps to three decimal places or the probe D and poten tial expressed millivolts to one decimal place Either screen will instruct the user to use the ENTER key to save the measure ment If the user does not require to save the measurement the EXIT key can be used Both the ENTER and the EXIT key will return the user to the main function menu allowing subsequent measurements on the same probe or selection of a new probe for measurement 23 If the measureme
19. able density and equiv alent weights Precise derivation of the alloy constant is shown in Appendix 1 of this manual as is a table of common alloys their UNS code and the appropriate alloy constant The UNS CONST TABLE contains a listing of 45 of the most common alloys which is used as a look up table automatically applying an appropriate alloy constant to each two electrode linear polarization measurement The UNS CONST TABLE func tion is accessible to the user through the main function menu to allow additions or deletions from the UNS alloy constant table 29 The table has a maximum capacity of fifty listings Attempts to add more than the total of fifty either directly through the UNS CONST TABLE or through the SELECT PROBE ID function will overwrite the initial listings in the table To avoid elimination of regularly used alloy constants the user should delete constants and UNS codes that are rarely used before adding new ones once a total listing of fifty has been reached 2 Addition Deletion of UNS Codes Access to the UNS CONST TABLE function is achieved as with all main functions by use of cursor ARROW keys and ENTER key in the main function menu Unlike most functions entry into the UNS CONST TABLE does not have to be preceded by a probe I D selection This submenu sequence for this function is illustrated below v DELETE UNS NO UNS ID USE ARROW KEYS ENTER INITIAL LETTER DELETE UNS
20. and instrument Click the Download button ensure that Part Status toggles to From the main menu of the instrument go to the Select Probe I D menu and select the probe data you wish to download From the main menu of the instrument go to the Communications menu and select Computer Upload Data will begin to transfer from the instrument to the PC and will appear in the data window of the Instrument Download Center as shown above If the data appears garbled the wrong instrument type has been selected Select another instrument type and try again If data does not appear in the data window at all verify that 34 The instrument is connected to a valid serial or USB port All cables are securely connected The message Port Status On appears in the status bar There are no errors on the instrument e f using a USB adapter ensure that the device drivers have been installed Selecting a Serial Port Use the Serial Port selection box to select the port to which the instrument is connected If the COM port number is unknown it can be found in Windows Device Manager under Ports COM amp LPT Selecting an Instrument Use the Instrument option box to select the model of Metal Samples instrument being downloaded This sets the appropriate communication parameters which will be displayed in the status bar at the bottom of the window 9600 N 8 1 for an MS1500 2400 N 8 1 for an MS35
21. ble Distance Output Specifications Special Features Microprocessor based electronics One 9V Battery 6 ft 1 83 m RS 232 Output in Comma Delimited ASCII Text Format Data storage capacity of 3000 readings on 150 different probes with battery backup Menu driven interface using a 12 key keypad and a 4 line LCD display Low battery detection Portable Accessory Items Carrying Case 6 Probe Cable attached Meter Prover 6 to 5 Pin Adapter Galvanic Adapter Communications Cable and Connector Operation Manual D Battery Installation Open the battery compartment by removing the slip fit cover on the rear of the instrument shown below and insert one 9 volt battery FRONT BACK SLIP FIT BATTERY COVER 1 9V BATTERY PROBE CONNECTOR Figure 2 Battery Installation E Computer Download Hook Up Use this cable to connect the MS1500L to a computer via serial port or USB port COILED DATA CABLE MS1500 SERIAL PORT ADAPTER TO COMPUTER SERIAL PORT SERIAL TO USB ADAPTER OPTIONAL COMPUTER USB PORT Figure 3 Computer Download Hook Up Use the port on top of the Top View of MS1500L MS1500L for connecting to a computer with the cable provided or to the MS3500L jJ with the Opti link cable See Communications p 32 for more information 7 F Adapter Use The probe connector on the MS1500L is a six pin female MIL SPEC 5 3106 1
22. ction Prior to any other action the user should use the down arrow on the keyboard to select SET TIME AND DATE followed by the enter key to access the function sub menu screens that have the following sequence SET TIME amp DATE HH MM DD MM YR UP ARROW WHEN DONE SET TIME amp DATE HH MM DD MM YR ENTER TO ACCEPT 11 Individual digits of the date and time can be set using the key board numbers Once an individual group e g hours is set the up arrow will shift the user to the next group of digits to be set Once the year group digits are set the up arrow will bring up a confirmation screen the command enter will set the time and date as shown An exit command will leave the time and date as previously set Whether the enter or exit command is applied the user will be returned to the function screen automatically At this point the user may either re enter the SET TIME AND DATE submenu to enter the correct time and date or if satisfied with the current time and date function proceed to other measure ments or data input The instrument clock will run on backup battery should the main battery fail so once the time and date is originally entered there should not be reason to further reset this parameter Should the user decide for any reason to reset the time and date after the initial setting the time continuity of any stored data will be disrupted and data will prove tedio
23. ctly true changes in and bc are largely canceled out in the ratio Commercial instruments generally absorb this ratio into and empirical constant which constitutes the average constant of proportionality derived from a large number of E measurements made with corresponding weight loss data Variations in E d values are practically accounted for by varia tions in the surface area of the test specimen or by programming commercial instruments with an alloy constant for each possible E d value this latter process is explained in Appendix 1 as is the derivation of the equivalent weight of an alloy 44 A final factor influencing any practical measurement is the capac itive effect that is produced by polarizing a metal surface Upon initial application of the polarizing voltage AE the resulting cur rent flow Al is a combination of the true polarizing current Al and the charging current Al used in charging the double layer capacitor at the metal solution interface This capacitive cur rent discharges after a finite time leaving only the residual polariz ing current that is the true measured value This effect is illustrat ed below AI POLARIZING CURRENT The true value of the polarizing current is the equilibrium value Al that is established after a time interval T This time lag will vary depending on the specific characteristics of the metal environment system between approximately 30 seconds and s
24. d average assum ing all major metallic constituents corrode in proportion to their weight percent for the alloy in question 55 In general metallic constituents present in amounts smaller than 196 are disregarded for the purposes of this calculation An exam ple of this is given below for AISI 302 Stainless Steel Element Percent Eq Wt Eq Wt x Percent Chromium 18 17 34 3 12 Nickel 9 29 35 2 64 Iron 73 27 92 20 39 Alloy Eq Weight 26 15 56 UNS Constant Table The following lists many of the common constructional metals alloys with their appropriate alloy constants All of these values are already programmed into the MS1500L memory Additional alloy constants can be added by the user applying the calculation principles outlined previously and with reference to the Table of Equivalent Weights on p 59 UNS F12101 F13502 G10100 G10180 G10200 K03504 K03006 K02504 K03011 K01800 G41300 K41545 550400 530400 530403 531600 531603 532100 541000 543000 Alloy Const 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 Alternate Designation AISI 1010 AISI 1018 AISI 1020 ASTM A105 ASTM A106 ASTM A53 ASTM A350LF2 ASTM A516 AISI 4130 ASTM A199 ASTM A199 T9 AISI 304 AISI 304L AISI 316 AISI 316L AISI 321 AISI 410 AISI 430 57 Major Constituents or common names Gray Cast Iron Gray Cast Iron 0 196 Carbon Steel 0 18 Carbon Steel
25. does not cover 1 probe assemblies 2 items expendable in nature or 3 items subject to damage from normal wear misuse or abuse or failure to follow use and care instructions All damaged items are to be shipped at Purchaser s expense to and from Metal Samples Metal Samples shall have the right to final determination as to the existence and cause of the defect The foregoing shall constitute the sole and exclusive remedy of any purchaser of Metal Samples products for breach of warranty and is exclusive and in lieu of all other warranties expressed implied or statutory including the implied warranties or merchantability and fitness In no event shall Metal Samples be liable for special or consequential damages or for any delay in the performance of this warranty due to causes beyond its control Orders or requests for additional information should be addressed to Metal Samples 152 Metal Samples Rd Munford AL 36268 Phone 256 358 4202 Fax 256 358 4515 E mail msc alspi com The technical information and suggestions contained herein are believed to be reliable but they are not to be construed as war ranties since conditions of use are beyond our control 64
26. e made Should the screen show incorrect information the user can use the EXIT key to return to the main function menu from which the ENTER PROBE 1 0 function can be re accessed to correct the probe I D information If the user has selected either two or three electrode linear polarization measurement a time cycle screen will be shown subsequent to the measurement type screen Unlike galvanic or potential measurement linear polarization is not truly instanta neous A period of time is required following the imposition of the polarizing voltage during which capacitive discharge takes place at the electrode prior to the establishment of an equilib rium polarizing current If insufficient time is allowed for the establishment of the equilibrium current the resultant corrosion rate measurement will be falsely high The time required for the establishment of equilibrium will vary from system to system 18 The time cycle screen allows the user to set a time cycle for the linear polarization measurement between one and five minutes This is selectable using the ARROW keys and confirmed using the ENTER key Once the time cycle is entered the screen will automatically display the probe I D the UNS code the measure ment type and the time cycle The ENTER key will accept this information and return the user to the main function screen from which the user may elect to make a measurement Should the information prove incorrect
27. etion of any readings 28 F UNS Constant Table 1 General As explained in the ENTER NEW PROBE section the UNS alloy code is used exclusively for reference in the case of 3 electrode linear polarization measurement galvanic measure ments and potential measurements It merely allows the user through the probe I D listings in the SELECT PROBE ID submenu to have a permanent record of the type of alloy used for the electrodes of a specific probe The exception to this function is when the measurement type is a 2 electrode linear polarization measurement In this case the UNS code will alter the constant of proportionality used in the corrosion rate calculation This is necessary since each alloy metal has a unique factor in the equation relating polarizing cur rent to corrosion rate This factor is the equivalent weight divided by the density In conventional 3 electrode measurements this uniqueness is accounted for by varying the surface area of the working electrode from alloy to alloy to account for these varia tions Essentially the surface area of the working becomes part of the instrument constant However the major manufacturer of electrodes for the two electrode linear polarization measure ment uses a constant electrode surface area irrespective of alloy Consequently when making a two electrode polarization measurement an additional factor must be incorporated into the instrument constant to account for the vari
28. everal hours Typically system exhibiting high corrosion rate with little film formation have short time cycles T whereas low corro sion rate systems showing strong film formation have longer time cycles Commercially available instruments provide a variable measurement time cycle to account for this phenomenon Since the decay characteristic is asymptotic even systems with extreme capacitative inertia will closely approach equilibrium within 15 minutes 45 Two electrode Corrosion Rate Measurement This technique is the simplest of all LPR corrosion rate measure ments This utilizes a sensor with two identical electrodes made from the metal alloy of interest The notional equivalent electric circuit is illustrated below Re a Rp S AVV A 1 Al E Ce Rp Polarization Resistance Solution Resistance C Electrode Capacitance 20 are applied between the test and auxiliary electrodes for the predetermined user selectable time cycle and the polarizing current at the end of the cycle 1 is stored The applied potential is then automatically reversed and the equilibrium polarizing current 1 value is again stored The average value of the polarizing current in the forward and reverse polarizations is then automatically used to calculate and display corrosion rate directly as MPY This manipulation is based on equation 5 p 44 Since no instrumental method is
29. hts Name Symbol Atomic Wt Actinium Ac 227 Aluminum Al 26 98 Americium Am 243 Antimony Sb 121 76 Arsenic As 74 92 Barium Ba 137 36 Berkelium Bk 247 Beryllium Be 9 013 Bismuth Bi 208 99 Cadmium Cd 112 41 Calcium Ca 40 08 Cerium Ce 140 13 Cesium Cs 132 91 Chromium Cr 52 01 Cobalt Co 58 94 Columbium See Niobium Copper Cu 63 54 Curium Cm 247 Dysprosium Dy 162 51 Erbium Er 167 27 Europium Eu 152 0 Francium Fr 223 59 Valence N N WP 0 e N Equivalent Wt 8 99 40 58 24 97 68 68 4 51 69 66 56 20 20 04 46 71 132 91 17 34 29 47 63 54 82 33 54 17 55 75 76 0 223 Table of Equivalent Weights continued Name Gadolinium Gallium Germanium Gold Arum Hafnium Holmium Indium Iridium Iron Lanthanum Lead Plumbum Lithium Lutetium Magnesium Manganese Mercury Molybdenum Neodymium Neptunium Nickel Niobium Columbium Osmium Palladium Platinum Plutonium Potassium Symbol Gd Ga Ge Au Hf Ho In Ir Fe La Pb Li Lu Atomic Wt 157 26 69 72 72 60 197 0 178 50 164 94 114 82 192 2 55 85 138 92 207 21 6 94 174 99 24 32 54 94 200 61 95 95 144 27 237 58 71 92 91 190 2 106 4 195 09 244 39 1 60 Valence 3 WN Www amp hM N PY W FP e NY Ui Equivalent Wt 52 42 34 85 18 15 65 66 44 62 54 98 38 27 64 06 27 92 46 30 103 6 6 94 58 33 12 16 27 47 20
30. ing installed the battery as discussed on page 6 the unit is ready for operation The instrument may be activated using the toggle switch on the left side of the base of the instrument When switched on the instrument will initially show the self test screen display the free storage then automatically jump to instru ment functions as shown below Metal Samples MS1500L V X X SYSTEM TEST SCREEN SYSTEM TEST XXXX AUTOMATIC Metal Samples MS1500L V X X FREE STORAGE SCREEN FREE STRORAGE XXXX AUTOMATIC gt SELECT PROBE I D MAKE MEASUREMENT RECALL READINGS DELETE READINGS MAIN FUNCTION SCREEN UNS CONST TABLE COMMUNICATIONS SET TIME amp DATE 10 The initial screen showing the system test will scroll the four digit number until it has counted all the free storage The free storage is then displayed on the second screen which appears automati cally A new instrument should show a free storage of 3000 If a number lower than 3000 is shown the instrument contains stored data from factory testing Any such data should be located through the SELECT PROBE 1 0 function and deleted see Select Probe I D p 14 and Delete Readings p 27 Once the free storage has been displayed the screen moves automatically to the instrument function screen This screen shows a series of cursor selectable options that allow the user to enter data or perform some measurement or a
31. ions Potential Swing Activation Alloy of Constructiom Negative Potential Swing Pitting Rapid Potential Transients Identical Electrodes of with Time the Constructional Alloy With an appropriate choice of electrode combinations potential measurements will provide extensive information on file forma tion and breakdown localized attack and indicate the presence of the various oxidizing species necessary for corrosive attack 51 IV Testing the MS1500L with the LPR Meter Prover An LPR Meter Prover is provided to allow routine checks of the MS1500L instrument The LPR Meter Prover simulates a 3 electrode LPR probe at a fixed value which is printed on the Meter Prover label as shown below MetalSamples Corrosion Monitoring Systems LPR Meter Prover Reading E 10 mpy 1 mpy 3 LPR3 Settings To test the MS1500L with the Meter Prover 1 Enter a new Probe ID in the MS1500L menu with the following settings Probe ID Enter any ID number that does not conflict with probe ID s in use Probe LPR3A e UNS Number G10100 Cycle Time 1 Minute See ENTER NEW PROBE on page 15 of the user s manual for detailed instructions Note This Probe ID can be used for future checks with the Meter Prover 2 Connect the LPR Meter Prover to the MS1500L probe connector as shown to the right 3 Perform a measurement by selecting MAKE MEASUREMENT from the main menu see
32. ither command will return the user to the main function screen for further measurements or to re access the UNS CONST TABLE function to enter correct codings If the DELETE UNS option is selected the second screen of the sequence will request the UNS ID The user should use the ARROW key to scroll to the appropriate initial letter and the ENTER key to confirm the selection This will activate the second screen allowing the user to enter the remaining five digits using the keyboard and finally confirming the entry with the UP ARROW key This will activate the final screen of the sequence showing the UNS code and requesting an ENTER instruction to delete or an EXIT instruction to abort deletion Either instruction will return the user to the main function screen for further measurements or data input 31 G Communications The MS1500L Data Logger has the ability to store readings as they are taken These readings can later be transferred to your PC via serial port or USB port To transfer data to a PC it is necessary to install the Corrosion Data Management Software Installing the Software To run the Corrosion Data Management Software you need a PC that meets the following requirements e Pentium class processor e Windows 95 or higher operating system e 16 MB of RAM e 10 MB of available hard disk space VGA monitor with 800 600 or greater resolution e Mouse or pointing device recommended e Available 9
33. l backwards DOWN ARROW and forwards UP ARROW sequentially through the stored readings for the selected probe In instances where several hundred readings are stored and the user wishes to access a specific reading use of ARROW keys and scrolling can prove tedious In such a case the user should use the ENTER key which will call up the reading number screen The user can insert the reading number of specific interest and use the UP ARROW to recall the initial screen at the reading number selected scrolling either side of the selected reading number can be resumed using the ARROW keys The user can at any time return to the main function menu using the EXIT key 26 E Delete Readings This function is more selective than the Delete Probe function p 19 found in the SELECT PROBE I D submenu Using the Delete Readings function it is possible to selectively delete individual readings stored under any given probe 1 0 Having selected a probe the user may select the Delete Readings function using the cursor and ENTER key on the main function screen The following screen sequence illustrates the use of the Delete Readings sub menus SELECT PROBE ID MAKE MEASUREMENT RECALL READINGS DELETE READINGS UNS CONST TABLE COMMUNICATONS UP ARROW ENTER X DELETE READINGS DELETE STARTS X UP ARROW WHEN DONE SET TIME AND DATE DELETE READINGS DD MM Y
34. look up table will hold a maximum of fifty alloy constants together with their UNS codes so that the user may occasionally wish to delete alloy constants and UNS codes to make room for more frequently used designations this is also accomplished through the ALLOY CONST TABLE menu A table of common UNS codes together with appropriate alloy constants is given on p 57 The measurement type screen which is shown automatically after the UNS code screen or the alloy constant screen allows the user to select the measurement type by using the ARROW keys to scroll and the ENTER key to select The measurement types that are selectable are 17 LPR3A 3 electrode linear polarization corrosion rate using anodic polarizing current LPR3C 3 electrode linear polarization corrosion rate using cathodic polarizing current LPR2 2 electrode linear polarization corrosion rate GALV 2 electrode zero resistance current measurement POT 2 electrode potential measurement Once the measurement type has been selected one of two screens will present itself to the user If galvanic or potential measurement has been selected a screen showing the probe number the UNS code and measurement type will be shown If the information shown on the screen is consistent with the user s requirement the ENTER key will accept this information and return the user to the main function menu from which actual measurements may b
35. m equ Equivalent weight of metal gm g equ density of metal gm cm conversion factor centimeters to mils 393 7 oO aim ar Equation 1 reduces to 128 67 2 Since E and d are known for all metals and A can be fixed a measurement of Ico would allow corrosion rate to be determined Unfortunately direct measurement of lco4 is not possible since anodic and cathodic sites on a metal surface are continually shifting within a continuously conducting surface Indirect measurement of is possible This can be achieved by applying a small potential shift AE to a corroding metal surface and measuring the current Al required to maintain this potential displacement The value AE AI commonly called the polarization resistance is inversely proportional to Icog This relationship is embodied in the Stern Geary equation 43 b lb y Oa ELM J A e 3 fts AE b R polarization resistance ohms ba anodic rate constant mV decade cathodic rate constant mV decade Rearrangement of equation 3 gives AL b 7 4 COR 23 b b AE Substituting from 4 into 2 NS Uo ERR 5 234 E B lb d Practical measurement instruments fix the polarizing voltage at some small value for which equation 3 holds true This is usually 10mV 20mV The ratio bae b ba b is assumed to be constant Although this is not stri
36. mated by a percentage given by PERCENT ERROR 1 R Rp x 100 The IR Drop Error in this technique is directly proportional to solution resistance and to corrosion rate It is difficult to set ab solute limits on applicability however fluids with a solution resis tance of more than 50 1000 cm are likely to produce unaccept able errors The technique should be confined to such fluids such as brines sea water cooling waters and electrolyte solutions with a concentration of 0 1M and higher 47 Three electrode Corrosion Rate Measurement The three electrode method uses a true potentiostatic circuit to shift the potential of a test electrode 10mV from the corrosion po tential open circuit equilibrium potential Such a circuit may be notionally represented as shown below 10 mV Al AAA RTS TI 9 gt c lt When a measurement is made the instrument will initially null any residual potential difference between the reference electrode and the test electrode After which current will flow from the auxiliary electrode onto the test electrode The flow of current between the auxiliary electrode and the test electrode will in crease until the test electrode potential is shifted 10 mV with respect to the reference electrode The current Al required to sustain the 10 mV potential shift is used t
37. measure ments to be made in solutions with resistivities of 1000 2000 O cm While this technique is a significant improvement on the two electrode measurement it will give erroneous information in discontinuous electrolytes and poorly conducting fluids such as distilled water In these latter cases as with gases the user must resort to electric resistance corrosion measurement sensors 49 257772217535 TRIANGULAR ELECTRODE 2 22 22 22 CONFIGURATION gt pes FLUSH ELECTRODE po MM CONFIGURATION REFERENCE TEST AUXILIARY In making the three electrode LPR measurement the MS1500L uses a high impedance potential measuring circuit Advantage is taken of this circuitry to provide the user with a means of directly measuring both redox and corrosion potentials The uses of such information in corrosion diagnostics are many and various and a full discussion of this topic is beyond the scope of this manual However a few examples are given below to provide the reader with some insight into the versatility of potential measurements Application Criteria of Assessment Electrode System Cathodic 850 vs Cu CuSO or Cu CuSO or Ag AgCl Protection Negative Swing of 200mV Reference vs Protected Structure Oxygen Ingress Positive Potential Swing Platinized Niobium vs Ag AgCl Reference Actice Passive Passivation Positive Ag AgCl Reference vs Transit
38. nd the instrument with a minimum of three inches of resilient packing material such as foam rubber or shredded newspaper 2 Ship the instrument prepaid via air freight or air express to Metal Samples 152 Metal Samples Rd Munford AL 36268 Phone 256 358 4202 Fax 256 358 4515 E mail msc alspi com 3 When the instrument is packed include a copy of the form on the next page filled in as required to expedite the repairs 62 Copy this form when you need to return an instrument Senda copy of this form filled in as completely as possible 1 Check one Repair this instrument under warranty Repair this instrument regardless of problem or cost of repair Inspect this instrument and advise customer of approximate cost of repairs if instrument is not covered under warranty Note This may delay return of instrument to customer 2 Instrument Model Serial Date of purchase Customer s original purchase order 3 Return this instrument to Company City State Zip Telephone E mail 4 Describe problem fully this may shorten repair time 5 Urgency of repairs 63 Appendix 3 Warranty Metal Samples warrants that any part of Metal Samples corrosion rate instruments and accessories which proves to be defective in material or workmanship within one year of the date of original shipment to Purchaser will be repaired or replaced at the option of Metal Samples free of charge This warranty
39. nt type is either two or three electrode linear polarization the ENTER will initiate the measurement time cycle as set by the user in the SELECT PROBE ID sequence During the measurement time cycle the screen will display the probe I D and the time cycle shown in whole minutes a request to wait is also displayed During the measurement cycle the minute indicator will flash at one second intervals and will count down whole minutes to zero Since the 2 electrode measurement involves two polarization cycles one anodic and one cathodic the actual time cycle set by the user is half the total measurement time the user should ensure that the cycle set for a 2 electrode linear polarization measurement is half the desired total measurement time At the conclusion of the linear polarization measurement cycle the 3 electrode measurement will display the probe I D and the corrosion rate in MPY MIL PER YEAR The two electrode measurement will also display the pitting index Either screen will instruct the user to PRESS ENTER TO SAVE which will save the measurement and return the user to the main function menu to make further measurements The EXIT key will also return the user to the main menu but will not save the measurement 24 D Recall Readings This main function allows the user to recall all readings stored under any probe I D to the instrument screen for review As with most functions the precursor to use is to select
40. o compute which in turn is used to provide a direct read out of corrosion rate 48 This technique does not require the individual programming of al loy constants to allow for variations in E d from alloy to alloy This variation is accounted for by varying the surface of electrodes in direct proportion to E d from alloy to alloy so that compensation is automatic The major advantage of the three electrode LPR technique is that it considerably lowers the effect of solution resistance errors This is achieved by measuring the polarizing voltage as the potential shift of the working electrode relative to a reference electrode in a high impedance circuit Negligible current flows in this potential measuring circuit and IR drop errors are virtually eliminated Some residual IR drop error does occur in highly resistive solu tions due to the spreading of the current field generated by the flow of current between the test electrode and the auxiliary electrode Excessive current spread will cause the field to impinge on the reference electrode which will introduce an IR drop error The extent of this error is largely a function of electrode geometry as illustrated on the next page As can be seen the field effect error is greatest with a triangle electrode configuration less so with a linear electrode configura tion and almost non existent with a concentric ring arrangement An appropriate choice of electrode geometry will allow
41. onsequently when the instrument calculates the corrosion rate mpy from the measured polarizing current M a means needs to be found whereby the instrument can know the appropriate value of E d and perform the correct calculation of corrosion rate This is achieved in the conventional three electrode LPR measure ment by varying the surface area of working electrode in propor tion to the E d value of the metal alloy in question thus avoiding the need to program special correction factors into the instrument for each and every alloy Unfortunately the major producer of the two electrode probe uses a constant surface area for the working electrode irrespec tive of the metal alloy under examination Thus a correction factor has to be applied for each metal alloy under consideration This is in fact the alloy constant used for two electrode corrosion rate measurements in the MS1500L unit The basic formula for derivation of the correction factor is Ui x A alloy constant E equivalent weight of metal alloy in question gms density of alloy in question gms cm 1 For pure metals if the appropriate alloy constant does appear in the MS1500L memory already the user can apply equation 6 to calculate and program the appropriate alloy constant into the instrument memory Difficulties arise when trying to work out the equivalent weight of alloys This is approached by use of a weighte
42. oop Wire Loop Wie Loop Wie Loop Wire Loop Wire Loop Wie Loop Wie Loop Wie Loop Wite Loop HH EXIT Printing Data The data table can be printed by clicking Print in the Options menu A print dialog box will be displayed to allow printer selection and setup 37 Creating A Chart To chart the selected data click the Chart Data button or select Chart Data from the Options menu The chart will be displayed in a new window Printing a Chart A chart can be printed using the Print Chart option in the File menu A print dialog box will be displayed to allow printer selec tion and setup Exporting a Chart A chart can be exported to other applications using the Copy Chart option in the File menu This will copy both the chart and the raw data to the Windows Clipboard The chart can then be inserted into other applications using the Paste function Note In some applications using the Paste function will insert the raw data instead of the chart In this case use the Paste Special function then select Picture to insert the chart Chart Tools e Statistical Data The Statistical Data tab at the bottom of the Data Chart window will display a page with statistical information about the chart data If the Statistical Data page is visible this information can be printed by clicking Print Statistical Data in the File menu 38 e Finding A Data Points Value While viewing the chart
43. over 52 M Appendices user norte a 54 Appendix 1 Derivation of Alloy Constant 54 Appendix 2 Returning 1 lt 62 Appendix 64 Introduction A Instrument Function Overview The MS1500L is a hand held measurement and data collection device It is lightweight easily handled and battery operated so that it can be carried to any location where measurement or data collection is required The MS1500L has several measurement functions e 3 Electrode Linear Polarization corrosion rate 2 Electrode Linear Polarization corrosion rate Pitting Index e Zero Resistance Ammetry e Electrode Potential This versatility allows the unit to be used with all commercially available corrosion rate probes Additionally it can be used with all types of galvanic probes to measure bimetallic corrosion changes in the oxidizing power of the process fluid and with suitable electrode combinations crevice and pitting attack as well as stress corrosion cracking Using galvanic probes with an appropriate combination of corroding redox and reference electrodes it is possible to measure the corrosion potential of a corroding electrode or the redox potential of the process fluid which provides a wide range of information on such phenomena as active passive transitions
44. page 22 of the user s manual 52 4 Allow the measurement to finish The measured value should match the value on the Meter Prover label and should be within the printed tolerance If the reading is out of tolerance then further troubleshooting may be required It is important to remember that the LPR Meter Prover simulates a 3 electrode probe If the 2 electrode setting is used to measure the Meter Prover the results will not match the printed value 53 V Appendices Appendix 1 Derivation of Alloy Constant The variation of the Stern Geary equation relating the corrosion current icor to the polarization resistance AE AI is given by Al lcor 2 3 TT 1 which reduces to qe m 2 lor current due to corrosion amps AE applied polarizing voltage volts AI measured polarizing current amps B B rate constants volts decade K constant dimensionless To convert the polarizing current to the conventional MPY MILS PER YEAR units of corrosion Faraday s laws are applied as follows oamp S E 1000 X X AxF d 254 Al kx S E 1000 p i 4 AxF d 254 AIK E cw 128 668 6 5 a Xr 7 5 number of seconds one year Faraday s constant coulombs working electrode surface area in cm equivalent weight of corroding metal gms density of corroding metal gms cm corrosion rate mpy 54 C
45. pin serial port or USB port CD ROM drive for software installation To install the Corrosion Data Management Software 1 Insert the setup disk provided in your accessory kit 2 You will be prompted to close any open programs After you have done so click OK to continue HU Metal Samples CDMS Setup Welcome to the Metal Samples CDMS installation program Setup cannot install system files or update shared files if they are in use Before procesdibx we recoaisend thak You cave any applications you we 32 3 Click the install button to begin installation Note it is recommended that you install the software in the default directory 4 After clicking the install button the software will be installed on your PC 5 When the software installation is complete you should remove the setup disk then reboot your computer 33 Instrument Download Center The Instrument Download Center is a simple tool for retrieving data from Metal Samples ER and LPR data logger instruments 5 Man Menu Metal Samples gt Corrosion Monitoring Systems Corrosion Data Management Software A E 04 To download data from an instrument e Connect the instrument to an available PC serial port or USB port see page 3 Turn the MS1500L on Run the Corrosion Data Management Software e Open the Instrument Download Center Select the serial port
46. propriate 1 0 number is entered which may be any digital sequence the user cares to adopt the UP ARROW key will transfer the user to the next screen If the user has selected a probe I D already use the menu will divert from the normal sequence inform the user that the selected 1 0 is already in use and ask if old probe readings are to be deleted Unless the user wishes to delete existing probe readings the EXIT key should be selected which will return the user to the main function menu allowing re entry to the SELECT PROBE I D menu so that the user may select a probe that is not in use Should the user wish to delete readings already stored under the selected probe I D ENTER should be selected existing probe readings will be deleted and the probe will be free for reuse Assuming a unique probe 1 0 has been selected or the user has elected to delete existing data as described in the previous para graph a screen will be shown allowing entry of the UNS code for alloy identification This will be a letter followed by a five digit number For most measurement applications the UNS code is merely used as reference data However in the case of a 2 electrode linear polarization measurement the UNS number will trigger the use of an alternate proportionality constant the instrument s cal culation of corrosion rates See UNS Constant Table p 57 The initial letter of the UNS constant is
47. s will be requested If the probe in question is not known the user will have the tedious task of returning to the main function screen scanning the probe 1 0 list and finally re entering the DELETE PROBE sequence Once the DELETE PROBE sequence is entered the screen will request the I D of the probe to be deleted This is entered using the numeral keys and the UP ARROW key at the conclusion A warning screen will now appear listing the probe I D to be deleted and a request for confirmation If the user is in doubt the EXIT key should be used to return the user to the main function screen without deletion of any data Having decided that the probe data is of no further value use the ENTER key to delete the probe data The instrument screen will now automati cally sequence through a DELETING READINGS screen followed by an UPDATING PROBE LIST screen and finally returning the user to the main function screen Once this sequence is complete the probe data and probe I D are removed from the MS1500L memory 21 C Make Measurement Before any measurement can be made a probe I D must be selected This may be done in one of two ways If the probe is one for which a probe I D and data are already stored in memory simply enter the SELECT PROBE 1 0 submenu scan the existing probe I D listings and select the appropriate probe 1 0 using the cursor ARROW keys and the ENTER key when the cursor is set
48. selected from the key board and confirmed using the ENTER key The subsequent five digits are selected using the keyboard and confirmed using the UP ARROW key The screen will automatically change to the alloy constant screen or the measurement type screen 16 If the UNS code entered for this particular probe is already con tained in UNS CONST TABLE the instrument will already have a record of the alloy constant and will pass directly to the measure ment type screen if not the instrument will automatically pass to the alloy constant screen The alloy constant screen allows the user to input a two digit number from the keyboard This will be a number less than ten given to the first decimal place using the UP ARROW when complete to pass to the measurement type screen The alloy constant is a correction factor used to account for variation in electrode surface area when making a two electrode corrosion rate measurement A look up table for forty five of the commonest alloy constants is programmed into the IMS1500L and should the user select one of these alloys the instrument will automatically enter this constant without showing the alloy constant screen Additional alloy constants are automatically added to the look up table as the user programs them through the SELECT PROBE I D menu alternatively they can be added directly to the look up table through the ALLOY CONST TABLE menu see UNS Constant Table p 57 The
49. th data already in memory for which the user requires to make additional measurements review existing data stored for that probe or delete data for the probe selected It also allows the user to enter a new probe I D together with a requirement measurement function alloy identification and time cycle if required The SELECT PROBE I D function may be entered by selecting this option on the main function screen using the cursor then pressing the ENTER key The initial submenu screen will appear as shown below ENTER NEW PROBE DELETE PROBE XXXXXX XXXXXX XXXXXX The screen lists options for entering a new probe deleting a probe and also lists all identities for probes with data already stored in memory Those probes already in use are listed as four digit 1 0 number three to five letters and digits describing the measurement type and single letter followed by five digits designating the UNS alloy code p 57 lists the most common alloys and their UNS codes If the user simply wishes to make a measurement recall readings delete reading or download data for an existing probe the specific probe is selected using the cursor and arrow keys followed by the 14 ENTER key The probe is now selected and the user will be returned to the main function screen to make a measurement recall readings delete readings or download data for the probe
50. the probe of interest This is accomplished by entering the SELECT PROBE ID submenu reviewing the list of probe 1 0 5 stored and using the cursor coupled with the ENTER instruction to select the probe and return to the main function menu Once the probe I D is selected the RECALL READINGS submenu is entered using the main function menu cursor directed by ARROW keys and activated with the ENTER key The following screen sequence comprises the RECALL READINGS submenu ENTER v XXX XX XX XX POT POTENTIAL XXX mv USE ARROWS ENTER XXX XX XX XX LPR2 COR RATE XXX XX MPY USE ARROWS ENTER UP ARROW ENTER ENTER READING READING 1 TO X UP ARROW WHEN DONE The initial screen of the RECALL READINGS submenu shows the last reading number date and measurement type sequentially on the top line The reading number is merely the total number of readings stored which is also the number of the most recent reading stored The date is shown in the European form of day month year The next line shows the measured value which may be millivolts milliamps or corrosion rate depending on the measurement type If the measurement type is 2 electrode linear polarization a third line will show a dimensionless number the so called pitting index 25 The last line is an instruction to use either the ARROW keys or the ENTER key The ARROW keys allow the user to scrol
51. us to analyze subsequent to the time change The purpose of the remaining menus displayed on the function screen is described in detail in subsequent sections of this manual However the following gives a brief overview of these functions and their use SELECT PROBE I D This allows a probe to be given a unique reference number a selected measurement mode an electrode alloy identification and where necessary a measurement time cycle and electrode area modifying factor MAKE MEASUREMENT This instructs the instrument to make a measurement and save the resulting data RECALL READINGS This allows the stored data from any or all probes to be called to the instrument screen and reviewed 12 DELETE READINGS UNS CONSTANT TABLE COMMUNICATIONS SET TIME AND DATE This permits the deletion of redundant or obsolete data from memory This permits the insertion of correction factors when the user employs electrodes of nonstandard surface area This executes the download of data from the MS1500L to a PC for further processing and analysis This allows the user to alter the setting of the instrument clock T3 B Select Probe I D 1 General This function menu is central to the whole operation of the instru ment With the exception of the UNS CONSTANT TABLE and the SET TIME AND DATE no function menu can be used prior to the selection of a probe 1 0 The menu allows you to identify a specific probe wi
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