Myron L MLJ-PS6SI Operation Manual Download Page 40

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units” to compare to older published data, in terms of NaCl or 442, or

may be appropriate. The

ool

can be used to reconcile data taken

with other compensation assumptions.

XX.

CONDUCTIVITy CONVERSION to TOTAL

DISSOLVED SOLIDS (TDS)

Electrical conductivity indicates solution concentration and ionization

of the dissolved material. Since temperature greatly affects ionization,

conductivity measurements are temperature dependent and are

normally corrected to read what they would be at 25°C (ref. Temperature

Compensation, pg. 37).

A. How it’s Done

Once the effect of temperature is removed, the compensated conductivity

is a function of the concentration (TDS). Temperature compensation of

the conductivity of a solution is performed automatically by the internal

processor with data derived from chemical tables. Any dissolved salt at

a known temperature has a known ratio of conductivity to concentration.

Tables of conversion ratios referenced to 25°C have been published by

chemists for decades.

B. Solution Characteristics

Real world applications have to measure a wide range of materials and

mixtures of electrolyte solutions. To address this problem, industrial users

commonly use the characteristics of a standard material as a model for

their solution, such as KCl, which is favored by chemists for its stability.

Users dealing with sea water, etc., use NaCl as the model for their

concentration calculations. Users dealing with freshwater work with

mixtures including sulfates, carbonates and chlorides, the three

predominant components (anions) in freshwater that the Myron L

Company calls “natural water”. These are modeled in a mixture called

“442™” which the Myron L Company markets for use as a calibration

standard, as it does standard KCl and NaCl solutions.

The

ool

contains algorithms for these 3 most commonly

referenced compounds. In the LCD display, the solution type being used

is displayed on the left.

C. When does it make a lot of difference?

First, the accuracy of temperature compensation to 25°C determines the

accuracy of any TDS conversion. Assume we have industrial process

Summary of Contents for MLJ-PS6SI

Page 1: ...16 November 10 Operation Manual POOLPRO ...

Page 2: ...ecause of our commitment to product improvement the substance and style of this manual may change When changes are made the updated manual is posted for download in PDF format from the Myron L Website www myronl com ...

Page 3: ...ore Down key Memory Recall Conductivity Cell Displayed here Temperature readout Memory Storage Recall pH Calibration ORP Electrode pH Glass Electrode pH ORP Sensor Replaceable Instrument Illustration Temperature Sensor Date Time displayed here Measurement P O O L P R O Units Of Measurement Parameter mS millisiemens cm millimhos cm µS microsiemens cm micromhos cm PPM parts per million PPM parts per...

Page 4: ...ii ...

Page 5: ... and accompanying U2CI software is compatible with most computers using either Microsoft Windows XP Vista or 7 or Macintosh OSX The data may be imported into a variety of spreadsheet formats like Microsoft Excel CSV Please Note Although the Myron L Company has performed extensive testing we cannot guarantee compatibility of all applications and formats We suggest testing your application and forma...

Page 6: ...reprogrammed into microprocessor Real Time Clock with Time and Date Data Logging with TIME and DATE in memory Memory stores 100 readings User adjustable timeout Auto OFF B General Specifications Display 4 Digit LCD Dimensions LxWxH 196 x 68 x 64 mm 7 7 x 2 7 x 2 5 in Weight 352 g 12 4 oz Case Material VALOX Cond MIN SALT TDS Cell Material VALOX Cond TDS Electrodes 4 316 Stainless Steel Cond MIN SA...

Page 7: ...r diagnosis or repairs due to normal wear abuse or tampering This warranty is limited to the repair or replacement of the PoolPro only The Myron L Company assumes no other responsibility or liability 0 01 100 ppm 0 1 1000 ppm 1 0 10 ppt 0 01 100 ppt 0 1 200 ppt 0 9999 ppm 10 200 ppt in 5 autoranges 0 9999 µS cm 10 200 mS cm in 5 autoranges 1 of reading 1 of reading 1 of reading 0 01 100 µS 0 1 100...

Page 8: ...ll 9 B Maintenance of the pH ORP Sensor 9 V SPECIFIC RECOMMENDED MEASURING PROCEDURES 9 A Measuring Conductivity MIN SALT TDS 9 B Measuring pH 10 C Measuring ORP mV to ppm page 44 10 VI SOLUTION SELECTION 11 A Why Solution Selection is Available 11 B The 3 Solution Types 11 C Calibration of Each Solution Type 11 D Procedure to Select a Solution 11 VII CALIBRATION 12 A Calibration Intervals 12 B Ru...

Page 9: ...TRUCTIONS 25 A Software Installation 25 B Hardware Setup 25 C Memory Stack Download 26 XVI CARE and MAINTENANCE 27 A Temperature Extremes 27 B Battery Replacement 27 C pH ORP Sensor Replacement 27 D Cleaning Sensors 28 XVII TROUBLESHOOTING 30 XVIII ACCESSORIES 32 A Conductivity TDS Standard Solutions 32 B pH Buffer Solutions 32 C pH Sensor Storage Solution 32 D Soft Protective Carry Cases 32 E Har...

Page 10: ... TEMPERATURE COMPENSATION Tempco and TDS DERIVATION 37 XXII pH and ORP 38 A pH 38 B ORP Oxidation Reduction Potential REDOX 40 XXIII SOFTWARE VERSION 41 XXIV GLOSSARY 42 XXV ADDENDUM NEW ORP PPM FREE CHLORINE FEATURE 43 XXVI ADDENDUM NEW LSI HARDNESS CALCULATOR 45 A LSI Calculator Mode 46 B LSI Calculator User Mode 47 C Hardness Unit Preference Selection 49 ...

Page 11: ...s in CAL mode User adjustable up to 75 seconds Rarely is it necessary to press and hold a key as in Procedure to Select a Solution pg 11 or Cond or TDS Calibration pg 12 C Operation of the Keys See Instrument Illustration on pg i 1 Measurement Keys in General Any of the measurement keys in the upper part of the keypad turns on the instrument in the mode selected The mode is shown at the bottom of ...

Page 12: ...he pH ORP sensor well must be refilled with Myron L pH Sensor Storage Solution and the protective cap reinstalled securely ref Maintenance of the pH ORP Sensor pg 9 and Cleaning Sensors 2 pH ORP pg 28 a pH Key A press of displays pH readings No units are displayed on the right b ORP Key A press of displays Oxidation Reduction Potential REDOX reading in millivolts mV is displayed 4 CAL MCLR Key A p...

Page 13: ...l must be kept wet with a solution Before replacing the rubber cap rinse and fill the sensor well with Myron L pH Sensor Storage Solution If unavailable you can use an almost saturated KCl solution pH 4 buffer or at least a strong table salt solution NEVER use distilled water ref pH and ORP Practices pg 18 V SPECIFIC RECOMMENDED MEASURING PROCEDURES If the proper solution is not selected KCl NaCl ...

Page 14: ...to be measured Shake out each sample to remove any residual liquid 3 Refill both sensor wells with sample 4 Press 5 Take reading NOTE When ppm free chlorine units are selected ref free chlorine unit selection pg 43 annunciators alert you when the concentration is outside the specified measurement range Or over range will display when the concentration is over the range limit 9 9 ppm Ur under range...

Page 15: ...alibration of Each Solution Type There is a separate calibration for each of the 3 solution types Note that calibration of a 442 solution does not affect the calibration of a NaCl solution For example Calibration ref Conductivity or TDS Calibration pg 13 is performed separately for each type of solution one wishes to measure ref Conductivity TDS Standard Solutions pg 32 D Procedure to Select a Sol...

Page 16: ...LS pg 17 B Rules for Calibration of the PoolPro 1 Calibration Steps a Starting Calibration Calibration is begun by pressing while measuring Conductivity MIN SALT TDS or pH Measuring continues but the CAL icon is on indicating calibration is now changeable The reading is changed with the and to match the known value The calibration for each of the 3 solution types may be performed in either conduct...

Page 17: ...tempts to calibrate too far up or down from there will cause the displayed value to be replaced with FAC If you accept it press the Cal key you will have the original default factory calibration for this measurement The need to calibrate so far out that FAC appears indicates a procedural problem wrong standard solution a very dirty cell cup or an aging pH ORP sensor ref Troubleshooting Chart pg 30...

Page 18: ...value is the same for all PoolPros and returns you to a known state without solution in the cell The FAC internal electronics calibration which bypasses the electrodes and cell is not intended to replace calibration with conductivitystandardsolutions Ifanothersolutiontyperequiresresetting change solution type and repeat this procedure a Press or or b Press c Press key until FAC appears and release...

Page 19: ... or the pH sensor is defective and needs to be replaced 5 Press or until the display reads 7 00 NOTE Attempted calibration of 1 pH point from factory calibration will cause FAC to appear This indicates the need for sensor replacement ref Troubleshooting pg 30 or fresh buffer solution The FAC internal electronic calibration is not intended to replace calibration with pH buffers It assumes an ideal ...

Page 20: ...n pH measurement mode 2 At this point the CAL BUFFER and Acd or bAS annunciators will be displayed see Figures 7 and 8 NOTE If the Acd and bAS indicators are blinking the unit is indicating an error and needs either an acid or base solution present in the sensor well 3 Rinse sensor well 3 times with acid or base buffer solution 4 Refill sensor well again with same buffer solution 5 Press or until ...

Page 21: ...et whenever pH 7 calibration is done 5 Temperature Calibration Temperature calibration is not necessary in the PoolPro VIII CALIBRATION INTERVALS There is no simple answer as to how often one should calibrate an instrument The PoolPro is designed to not require frequent recalibration The most common sources of error were eliminated in the design and there are no mechanical adjustments Still to ens...

Page 22: ...f calibration changes will reflect temperature changes more than the instrument s accuracy 3 Rinse out the cell with pure water after taking measurements Allowing slow dissolving crystals to form in the cell contaminates future samples 4 For maximum accuracy keep the pH sensor cap on tight so that no fluid washes into the conductivity cell D pH and ORP Practices to Maintain Calibration 1 Keep the ...

Page 23: ...umber 4 Press to display time and date stamp 5 Press any measurement key to leave memory recall or allow to automatically turn off C Clearing a Record Memory Clear After recalling a certain record location press and HOLD to clear that memory This space will be the place for the next memory record unless you scroll to another empty position before ending the recall sequence The next memory stored w...

Page 24: ...red X TIME and DATE The Time and Date may easily be changed as you travel A Setting TIME Time is always displayed in 24 hour time Example shown in Figure 11 16 05 equals 4 05 PM 1 Press 2 Press until the time is displayed stored readings PC OFF CLr ALL time i e 16 05 3 Press to initiate CAL will be displayed along with the time see Figure 11 4 Press or to change the time 5 Press to accept the chan...

Page 25: ...yed stored readings PC OFF CLr ALL time date i e 05 13 10 May 13 2010 3 Press to initiate CAL will be displayed along with the YEAR see Figure 13 4 Press or to change the YEAR 5 Press to accept the change new year 6 Press or to change the month 7 Press to accept the change new month see Figure 14 8 Press or to change the day 9 Press to accept the change new day see Figure 15 Figure 12 Figure 13 CA...

Page 26: ...ow indicate other format see Figures 16 17 4 Press any measurement key or allow to automatically turn off see Figures 16 17 XI TEMPERATURE FORMAT Centigrade Fahrenheit 1 Press 2 Press to display the stored memory records 3 Press repeatedly until you pass the US or Int date format location The display will show a C or F see Figures 18 and 19 Figure 16 Figure 17 Figure 18 Figure 19 ...

Page 27: ... data will be lost 1 Press 2 Press to display the stored memory records 3 Press repeatedly until you pass the CLr ALL and the C F locations The display will show a FAC SEL see Figure 20 4 Press to accept the resetting Display will return to Conductivity mode XIII CELL CHECK The cell check verifies the cleanliness of the conductivity TDS MIN SALT sensor In normal use the cell may become dirty or co...

Page 28: ...irty CELL cLn will be displayed see Figure 23 ref Cleaning Sensors pg 28 XIV AUTO OFF Auto off allows the user to adjust the time the instrument is ON up to 75 seconds after each press of a key Default time is 15 seconds with 60 seconds in CAL calibration mode 1 Press 2 Press to display the stored memory records 3 Press repeatedly until you pass the CELL ch location The display will show Auto oFF ...

Page 29: ...n Windows XP Vista and 7 and Macintosh OSX based computer systems and Bluetooth USB adapter dongle for computers that do not have Bluetooth capability A Software Installation 1 Place Myron L PoolPro U2CI Installation CD v2 0 0 later into your computer or download U2CI application from the Myron L website http myronl com main U2CI_Application_DL htm 2 Upon opening select the folder for your operati...

Page 30: ...Windows XP note the number of the outgoing COM port assigned by the computer NOTE The unit will automatically power down after 60 sec If the unit powers down during pairing repeat steps 1 3 above and continue C Memory Stack Download 1 With the PoolPro in PC On mode open the U2CI software application 2 Verify that the port selected matches the COM port number noted first time only This is the outgo...

Page 31: ...he cell cup area this may cause damage The pH sensor may fracture if the PoolPro temperature is allowed to go below 0 C 32 F Care should be exercised not to exceed rated operating temperature Leaving the PoolPro in a vehicle or storage shed on a hot day can easily subject the instrument to over 66 C 150 F This will void the warranty B Battery Replacement Dry Instrument THOROUGHLY Remove the four 4...

Page 32: ... porous liquid junction It should not be allowed to dry out If it does the sensor may sometimes be rejuvenated by first cleaning the sensor well with Isopropyl alcohol or a liquid spray cleaner such as Windex or Fantastic and rinsing well Do not scrub or wipe the pH ORP sensor Then use one of the following methods 1 Pour a HOT salt solution 60 C 140 F preferably potassium chloride KCI solution Myr...

Page 33: ...torage Solution to extend the useful life of the sensor If unavailable you can use a saturated KCl solution pH 4 buffer or a saturated solution of table salt and tap water but this should be replaced with storage solution as soon as possible Samples containing chlorine sulfur or ammonia can poison any pH electrode If it is necessary to measure the pH of any such sample thoroughly rinse the sensor ...

Page 34: ...ery weak or not connected 1 pH calibration needed ref pH Cal pg 14 2 Cross contamination from residual pH buffers or samples in sensor well 3 Calibration with expired pH buffers Sensor bulb is cracked or there is an electromechanical short caused by an internal crack pH ORP sensor has lost KCl 1 Temporary condition due to memory of solution in pH sensor well for long periods 2 Bulb dirty or dried ...

Page 35: ...placement pH ORP Sensor pg 33 Clean and rejuvenate sensor ref Cleaning Sensors pg 28 and recalibrate If no improvement replace pH ORP sensor ref Replacement pH ORP Sensor pg 33 Clean and rejuvenate sensor ref Cleaning Sensors pg 28 and recalibrate If no improvement replace pH ORP sensor ref Replacement pH ORP Sensor pg 33 Clean cell cup and electrodes ref Cleaning Sensors pg 28 Clean cell cup and ...

Page 36: ...tics approximating fresh natural waters and was developed by the Myron L Company over four decades ago It is used around the world for measuring both conductivity and TDS in drinking water ground water lakes streams etc 3000 ppm is the recommended standard Order 442 3000 3 Sodium Chloride NaCl This is especially useful in salt water pools and spas as sodium chloride is the major salt component Mos...

Page 37: ...ates solution concentration and ionization of the dissolved material Since temperature greatly affects ionization conductivity measurements are temperature dependent and are normally corrected to read what they would be at 25 C A Standardized to 25 C Conductivity is very accurately measured in the PoolPro by a method that ignores fill level electrolysis electrode characteristics etc and uses a mic...

Page 38: ... tempco of 1 68 C where the KCl value used would be 1 90 C Suppose a measurement at 15 C 59 F is 900 microsiemens of true uncompensated conductivity Using a 442 correction of 10 degrees below 25 x 1 68 indicates the solution is reading 16 8 low For correction dividing by 832 yields 1082 microsiemens as a compensated reading A KCl correction of 10 degrees below 25 x 1 9 indicates the solution is re...

Page 39: ...or process control E Other Solutions A salt solution like sea water acts like NaCl An internal correction for NaCl can be selected for greatest accuracy with such solutions Many solutions are not at all similar to KCl NaCl or 442 however are still referenced to one of these for the purpose of commonality Clearly the solution characteristics should be chosen to truly represent the actual water unde...

Page 40: ... to 25 C have been published by chemists for decades B Solution Characteristics Real world applications have to measure a wide range of materials and mixtures of electrolyte solutions To address this problem industrial users commonly use the characteristics of a standard material as a model for their solution such as KCl which is favored by chemists for its stability Users dealing with sea water e...

Page 41: ... and TDS DERIVATION The PoolPro contains internal algorithms for characteristics of the 3 most commonly referenced compounds In the display the solution type being used is shown to the left When taking conductivity measurements the Solution Selection determines the characteristic assumed as the instrument reports what a measured conductivity would be if it were at 25 C The characteristic is repres...

Page 42: ...alance would be 10 7 mol liter H and OH ions in a neutral solution where pH sensors give 0 voltage pH is defined as the negative logarithm of hydrogen ion concentration Where H concentration falls below 10 7 solutions are less acidic than neutral and therefore are alkaline A concentration of 10 9 mol liter of H would have 100 times less H ions than OH ions and be called an alkaline solution of pH ...

Page 43: ...eplaceable package The sensor body holds an oversize solution supply for long life The reference junction wick is porous to provide a very stable low permeable interface and is located under the glass pH sensing electrode This construction combines all the best features of any pH sensor known 5 Sources of Error The basics are presented in pH ORP pg 38 a Reference Junction The most common sensor pr...

Page 44: ...olution temperature Like pH it is not a measurement of concentration directly but of activity level In a solution of only one active component ORP indicates concentration Also as with pH a very dilute solution will take time to accumulate a readable charge 3 The ORP Sensor An ORP sensor uses a small platinum surface to accumulate charge without reacting chemically That charge is measured relative ...

Page 45: ...roken A surface film will slow the response time and diminish sensitivity It can be cleaned off with detergent or acid as with the pH glass XXIV SOFTWARE VERSION Contact the Myron L Company to see if a software upgrade is available 1 Press key 2 Press key until three numbers are displayed as shown in Figure 32 3 Press key instrument will time out in 15 seconds Figure 32 ...

Page 46: ...eral A term used in the pool spa industry for SALT Sodium Chloride NaCl Expressed in parts per million ppm ORP Oxidation Reduction Potential or REDOX See ORP Oxidation Reduction Potential REDOX pg 40 TDS Total Dissolved Solids or the Total Conductive Ions in a solution See Conductivity Conversion to TDS pg 36 Tempco Temperature Compensation See Temperature Compensation pg 33 For details on specifi...

Page 47: ... testing performed at the Myron L Company We have increased the accuracy of low range ppm free chlorine readings by extrapolating from the published data With this new feature the POOLPRO can measure a dynamic range of sanitizer concentrations that is wider than the range of a colorimetric test kit Additional ORP Specifications Spec Value Ranges 999 mV 0 2 9 9 ppm Resolution mV resolution 1 mV ppm...

Page 48: ...etween mV and ppm free chlorine measurement format The setting chosen is displayed ppm shown as example below 5 Press any parameter key to exit ORP unit preference selection or let the unit time out ORP unit preference will be saved PPM ...

Page 49: ...s as determined by the PS6SI TF 0 0117 x Temp 0 4116 CF 0 4341 x ln Hrd 0 3926 AF 0 4341 x ln AL 0 0074 The following is a general industry guideline for interpreting LSI values An index between 0 5 and 0 5 indicates balanced water An index of more than 0 5 indicates scale forming water An index below 0 5 indicates corrosive water How to Use the PS6SI LSI Calculator In LSI Calculator mode accept a...

Page 50: ...well and the conductivity cell cup three times with sample solution 5 Fill both the sensor well and cell cup with sample solution and press 6 The PS6SI inferred value for alkalinity and AL will display see example in Figure 40 Press 7 The PS6SI inferred value for hardness and Hrd will display see example in Figure 41 Press 8 The pH value measured by the PS6SI and pH will display see example in Fig...

Page 51: ...it time out B LSI Calculator User Mode LSI Calculator User mode allows you to change any or all of the variable values then recalculate the saturation index using the adjusted value s NOTE You can only enter User mode AFTER PS6SI LSI value is displayed 1 Press after the PS6SI generated LSI value is displayed 2 LSI AdJ will display see Figure 45 Press The PS6SI inferred value for alkalinity and AL ...

Page 52: ...will display see example in Figure 48 5 Press the or keys to adjust the displayed value to the desired value Press to accept the value displayed The value for temperature measured by the PS6SI and C or F will display see example in Figure 49 6 Press the or keys to adjust the displayed value to the desired value Press to accept the value displayed User the user adjusted LSI value and LSI will displ...

Page 53: ...r mode or LSI Calculator User mode for hardness unit preference selection By default hardness unit preference is set to ppm see Figure 51 1 While in the Hrd screen in CALC LSI or LSI Adj mode press and hold the key HArd SEL will display along with the current unit preference see Figure 52 2 Press or to toggle between ppm and grains of hardness No unit icon is lit when grains is selected see Figure...

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Page 56: ...MYRON L COMPANY 2450 Impala Drive Carlsbad CA 92010 7226 USA Tel 1 760 438 2021 Fax 1 760 931 9189 www myronl com Made In USA PS6OM 16NO10 ...

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