Myron L POOLPRO PS9TK Operation Manual Download Page 54

Page: 54 / 72

Xvii. TROubLEShOOTing chaRT

Symptom

Possible cause

corrective action

display

, even though

measurement key pressed

Battery weak or not connected.

Check connections or replace battery. Ref. Battery Replacement, pg. 47.

Inaccurate

readings

1. pH calibration needed. Ref. pH Cal.,

pg. 33.

2. Cross-contamination from residual pH

buffers or samples in sensor well.

3. Calibration with expired pH buffers.

1. Recalibrate instrument.

2. Thoroughly rinse sensor well.

3. Recalibrate using fresh buffers. Ref. pH Buffer Solutions, pg. 53.

No response to

changes

Sensor bulb is cracked or an

electromechanical short caused by an

internal crack.

Replace pH/ORP sensor. Ref. Replacement pH/ORP Sensor, pg. 54.

Will not adjust down to

pH/ORP sensor has lost KCl.

Clean and rejuvenate sensor (ref. Cleaning Sensors, pg. 48) and recalibrate. If no

improvement, replace pH/ORP sensor (ref. Replacement pH/ORP Sensor, pg. 58).

readings drift or respond slowly to

changes in buffers/samples or “

Fac

” is

displayed repeatedly

1. Temporary condition due to memory” of

solution in pH sensor well for long periods.

2. Bulb dirty or dried out.

3. Reference junction clogged or coated.

Clean and rejuvenate sensor (ref. Cleaning Sensors, pg. 48) and recalibrate. If no

improvement, replace pH/ORP sensor (ref. Replacement pH/ORP Sensor, pg. 58).

Unstable

conductivity/TDS/

Min/SaLT

readings

Dirty electrodes.

Clean cell cup and electrodes. Ref. Cleaning Sensors, pg. 48.

Unable to calibrate

conductivity/TDS/

Min/SaLT

Film or deposits on electrodes

Clean cell cup and electrodes. Ref. Cleaning Sensors, pg. 48.

alkalinity

hardness

titration with

calibration

solution value not as

stated on bottle

1. Method error.

2. Dirty Cell Cup.

3. Dirty pipette.

4. Faulty pipette.

5. Contaminated calibration solution.

1. Repeat titration.

2. Clean cell cup and electrodes. Ref. Cleaning Sensors, pg. 48.

3. Clean pipette per manufacturer’s instructions.

4. Use a new pipette.

5. Use fresh calibration solution. Be sure to use a new tip for each type of solution

measured.

Low

ORP

Reading

Slow or no response to

ORP

changes

ORP platinum electrode is dirty.

Check the ORP sensor functioning. Take an ORP reading of Myron L pH/ORP

Sensor Storage Solution (ref. pH Sensor Storage Solution, pg. 53). If the reading is

outside the range of 350-400 mV, clean ONLY the platinum ORP

electrode with Myron L ORP Conditioner solution-soaked cotton swab (ref. ORP Sen

sor Conditioner Solution, pg. 53), being careful not to touch the swab to the glass bulb

of the pH sensor.

responds very slowly or returns an

atypically high Predictive

ORP

value

1. Dirty platinum electrode (see above).

2. ORP sensor memory/battery effect.

Some ORP sensors exhibit a residual

charge when measuring LOW Free

Chlorine concentrations soon after

measuring a HIgH Free Chlorine

concentration.

1. Rinse the pH/ORP sensor well briefly with a small amount of ORP Sensor

Conditioner Solution.

DO nOT

leave the conditioning solution in the sensor well

for more than 10 seconds.

2. Rinse the pH/ORP sensor 3 times with Sensor Storage Solution.

3. Fill the sensor well with Sensor Storage Solution and let rest for 5 minutes.

Summary of Contents for POOLPRO PS9TK

Page 1: ...POOLPRO Operation Manual MODEL PS9TK 18 April 12 ...

Page 2: ......

Page 3: ...r Storage Solution 11 Model SS2OZ 2oz bottle of NaCl 7500 12 Model NACL 75002OZ 2oz bottle of alkalinity Reagent A1 13 Model H2SO4 12OZ 2oz bottle of hardness Reagent C1 14 Model HCL 32OZ 2oz bottle of hardness Reagent H1 15 Model NAOH2OZ 2oz bottle of hardness Reagent H2 16 Model EDTA LC2OZ 2oz bottle of hardness Reagent H3 17 Model EDTA HC2OZ 2oz bottle of ORP ISA Sensor Conditioner 18 Model ORP...

Page 4: ...torage ORP Electrode pH Glass Electrode pH ORP Sensor Replaceable Instrument Illustration Temperature Sensor Date Time displayed here Test Value or Titration Prompts or LSI Mode Units Of Measurement Parameter mS millisiemens cm millimhos cm µS microsiemens cm micromhos cm PPM parts per million PPT parts per thousand mV millivolts No units display Conductivity MIN SALT TDS MIN SALT TDS ORP Mineral ...

Page 5: ...s 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 format for compatibility before relying on it For your convenience a ...

Page 6: ...ogging with TIME and DATE in memory Memory stores 100 readings User adjustable timeout Auto OFF Bluetooth wireless download capability with optional bluDock accessory package 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 Res TDS Cell Material VALOX Cond TDS Electrodes 4 316 Stainless Steel Cond Res TD...

Page 7: ... chloride 2 pH in the presence of RF fields 3 V m and 300 MHz If either ORP or pH is outside the specified limits the instrument will display Or D Warranty Service The Myron L POOLPRO excluding the pH ORP sensor has a Two 2 Year Limited Warranty The pH ORP sensor has a Six 6 Month Limited Warranty for materials and workmanship If an instrument fails to operate properly see Troubleshooting Chart pg...

Page 8: ...Because 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 9: ...e of the Conductivity Cell 11 B Maintenance of the pH ORP Sensor 11 V SPECIFIC RECOMMENDED MEASURING PROCEDURES 11 A Parameter Methods 11 B Titration Methods 11 1 Pipette Instructions 12 2 T plunger Instructions 13 3 Mixing Solution in Cell 13 C Measuring Conductivity MIN SALT Total Dissolved Solids TDS 14 D Measuring Alkalinity 14 E Measuring Hardness 16 1 Hardness Unit Selection 16 2 Hardness Ti...

Page 10: ...36 A Suggested Intervals 36 B Calibration Tracking Records 36 C Conductivity MIN SALT TDS Practices 36 D pH and ORP Free Chlorine Practices 37 IX MEMORY 37 A Memory Storage 37 B Memory Recall 37 C Clearing a Record Memory Clear 38 X TIME and DATE 39 A Setting TIME 39 B Setting DATE 39 C DATE FORMAT US International Int 41 XI TEMPERATURE FORMAT Centigrade Fahrenheit 41 XII TOTAL RETURN to FACTORY S...

Page 11: ... C 54 B Tempco Variation 55 C An Example of 2 different solution selections and the resulting compensation 55 D A Chart of Comparative Error 56 E Other Solutions 56 XX CONDUCTIVITY CONVERSION to TOTAL DISSOLVED SOLIDS TDS 57 A How it s Done 57 B Solution Characteristics 57 C When does it make a lot of difference 58 XXI TEMPERATURE COMPENSATION Tempco and TDS DERIVATION 58 XXII pH and ORP Free Chlo...

Page 12: ...ed to provide quick easy accurate measurements by simply pressing a key All functions are performed one key at a time There is no off key If the instrument remains inactive for 15 seconds after you press any parameter key user adjustable up to 75 seconds the instrument turns itself off The instrument turns itself off after 60 seconds of inactivity in CAL mode 3 minutes of inactivity in each titrat...

Page 13: ...e display c TDS Key A press of displays Total Dissolved Solids with units on the right This is a display of the concentration of ionized material calculated from compensated conductivity using the characteristics of a known material On the left is shown solution type selected for TDS ref Solution Selection pg 24 3 Alkalinity Hardness and LSI Keys These 3 keys enter the PS9 in the titration measure...

Page 14: ...CAL MCLR Key While measuring conductivity TDS or pH a press of allows you to enter the calibration mode Once in CAL mode a press of this key accepts the new value If no more calibration options follow the instrument returns to measuring ref Leaving Calibration pg 27 If is held down for about 3 seconds CAL mode is not entered but SEL appears to allow Solution Selection ref pg 24 with the Up or Down...

Page 15: ...solution pH 4 buffer or a saturated solution of table salt and tap water ref pH and ORP Free Chlorine Practices to Maintain Calibration pg 37 NEVER use distilled water If all ORP solutions are reporting approximately the same value clean ONLY the platinum ORP electrode with an MLC ORP conditioner soaked cotton swab being careful not to touch the swab to the glass bulb of the pH sensor V SPECIFIC R...

Page 16: ...tting up on the pipette to feel the different positions a To DRAW a sample Grasp the pipette by the shaft with your hand Rest your thumb on top of the plunger button Use your thumb to depress the top of the pipette to the FIRST STOP Insert the tip end down into sample until only the tip is submerged about 2 3mm 1 8 Slowly release the top and let it return to the REST position being careful to keep...

Page 17: ...t straight up out of the cell being careful to keep it centered over the mouth of the cell extender When the T plunger is completely out of solution tap the T plunger once firmly on the rim of the cell extender to dispel any clinging solution back into the cell Remove the T plunger completely from the cell area 3 Mixing Solution in Cell a Agitate When the display says to agitate AGit Grasp the ins...

Page 18: ...quired for titration Reagent A1 cell extender T plunger and 100 µL pipette with a clean tip installed NOTE If you do not complete each titration point within the 3 minute timeout period the PS9 exits the Alkalinity function Between titrations the PS9 will automatically power off after the period of inactivity defined in the AUTO OFF setting ref AUTO OFF pg 43 Press ALK to start the titration proce...

Page 19: ...ay when the reading stabilizes 9 Press CAL to accept and advance to the first titration prompt Add alternating with A1 displays then AGit t1 alternating with HOLd displays The number after t indicates which titration point you are on The number 1 here indicates this is the first titration point Subsequent titration points are sequenced numerically 2 3 4 etc 10 Using the pipette add 100 µL of Reage...

Page 20: ...or titration Reagent C1 Reagent H1 Reagent H2 Reagent H3 cell extender T plunger 100 µL pipette with a clean tip installed and two extra clean tips NOTE If you do not complete each titration point within the 3 minute timeout period the PS9 exits the Hardness function Press HARD to start the titration process over from step 1 Between titrations the PS9 will automatically power off after the period ...

Page 21: ... to escape Using your index finger firmly tap the side of the instrument closest to the conductivity cell to release any CO2 bubbles clinging to the conductivity cell cell cup extender wall This effectively reduces any bicarbonate alkalinity in the sample and prepares it for titration After 120 seconds Add alternating with H1 1 will display The 1 indicates the first addition of sodium hydroxide Th...

Page 22: ...ing 100µL of Reagent H2 or H3 using the pipette agitating and holding the PS9 as prompted then pressing CAL as prompted A hardness value will display when the titration measurement is complete 24 Note the hardness value for your records or press MS to store the value You can begin another Hardness titration by pressing HARD The PS9 will automatically power off after the period of inactivity define...

Page 23: ...e last stored alkalinity value is displayed 6 Press CAL to accept value and advance to the hardness value screen The last stored hardness value is displayed 7 Press CAL to accept value and advance to the pH value screen The last stored pH value is displayed 8 Press CAL to accept value and advance to the temperature value screen The last stored temperature value taken from the last stored hardness ...

Page 24: ...e default value of 25 ºC is displayed 8 Press UP or DOWN to adjust the temperature value or leave as displayed 9 Press CAL to accept and calculate LSI A saturation index value will display If you want to modify any of the input values and recalculate LSI based on those changes press CAL again and repeat steps 3 9 If you want to change hardness units you must do so in the hardness parameter See Har...

Page 25: ...n The POOLPRO allows the user to choose between measuring oxidizing sanitizers using either ORP mV or as parts per million ppm of equivalent free chlorine Use ORP to directly measure the oxidizing power of all sanitizers like ozone bromine peracetic acid or chlorine Use FCE to measure the strength of oxidizing sanitizers as ppm of equivalent free chlorine To select between ORP and Free Chlorine mo...

Page 26: ...he FCE function can be used to measure discrete samples flowing solution and bodies of water Measurement technique is particular to the type of sample For accurate results use the FCE Flow Method described in section 2 below to measure discrete or flowing samples Use the FCE Immersion Method described in section 3 below in situations where the PS9 can be dipped to obtain a sample Read through sect...

Page 27: ...g the measurement process Annunciators will alert you when either the pH or ORP of the final FCE ppm value are Out of Range Or 8 Press MS to store reading in memory if desired 3 FCE Immersion Method NOTE Use this method for pools spas and other large standing bodies of water 1 Hold instrument beneath the surface of the water to avoid surface effects on the water s chemistry 2 Swirl the instrument ...

Page 28: ...lution is unavailable you can use a strong KCl solution a pH 4 buffer or a saturated solution of table salt and tap water ref Cleaning Sensors 2 pH ORP pg 48 Do not allow pH ORP sensor to dry out VI SOLUTION SELECTION A Why Solution Selection is Available Conductivity resistivity and TDS require temperature correction to 25 C values ref Standardized to 25 C pg 54 Selection determines the temperatu...

Page 29: ...ions pg 52 D Procedure to Select a Solution NOTE Check display to see if solution displayed KCl NaCl or 442 is already the type desired If not 1 Press MIN SALT or to select the parameter on which you wish to change the solution type 2 Press and hold key for 3 seconds to make SEL appear see Figure 1 For demonstration purposes all 3 solution types are shown simultaneously Figure 1 KCl 442 NaCl 3 Use...

Page 30: ...H 7 acid and or base ORP Zero set with pH 7 automatically Alkalinity Gain Only Hardness Gain Only a Starting Calibration For Alkalinity and Hardness calibration is begun by pressing when the titration is complete and a value displays For Conductivity TDS or pH calibration is begun by pressing while measuring Conductivity TDS or pH Measuring continues but the CAL icon is on indicating calibration i...

Page 31: ...r functions attempts to calibrate too far up or down from the ideal FAC value stored in the PS9 by the factory 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 incorrect standard solution a very dirty c...

Page 32: ...ution type requires resetting change solution type and repeat this procedure a Press MIN SALT or b Press If in User solution mode press CAL key twice if in Conductivity and three times if in TDS to skip over tempco and ratio adjustments c Press key until FAC appears and release d Press to accept the factory calibration setting 3 Alkalinity Calibration Prepare the materials required for titration A...

Page 33: ...lunger from side to side allowing the arms of the T plunger to slide along the rim of the cell extender 7 Carefully remove the T plunger so as not to flick or spill remaining sample Tap the T plunger on the side of the cell extender to remove sample that may be stuck to the T plunger 8 Press AL alternating with tdS briefly displays along with the PPM value of the sample PrES CAL will display when ...

Page 34: ...pg 42 to reset the Alkalinity Calibration to the FAC setting along with all other calibrations 16 Press CAL to accept The PS9 will automatically power off after the period of inactivity defined in the AUTO OFF setting ref AUTO OFF pg 43 4 Hardness Calibration Prepare the materials required for titration Hardness Standard Solution 200PPM Reagent C1 Reagent H1 Reagent H2 Reagent H3 cell extender T p...

Page 35: ... PPM sample value PrES CAL displays when the reading stabilizes 9 Press CAL Add alternating with C1 will display then AGit alternating with HOLd will display 10 Using the pipette add 100µL of Reagent C1 to the sample close the cell extender cap securely then agitate and hold Repeat as prompted OPEn CAP alternating with PrES CAL will display 11 Tap the cell extender cap to dispel any solution cling...

Page 36: ...e cell extender cap securely to prevent any solution from spilling out then agitate and hold Repeat as prompted PrES CAL will display 18 Press CAL to advance to first titration prompt Add alternating with either EdTA LC Reagent H2 or EdTA HC Reagent H3 will display then AGit t1 alternating with HOLd will display The number after t indicates which titration point you are on The number 1 here indica...

Page 37: ...FF pg 43 5 pH Calibration Important Always zero your POOLPRO with a pH 7 buffer solution before adjusting the gain with acid or base buffers i e 4 and or 10 etc a pH Zero Calibration 1 Rinse sensor well and cell cup 3 times with 7 buffer solution 2 Refill both sensor well and cell cup with 7 buffer solution 3 Press to verify the pH calibration If the display shows 7 00 skip the pH Zero Calibration...

Page 38: ...on from factory setting by pressing or 6 Press to accept the new value The pH Zero Calibration is now complete You may continue with pH Gain Calibration or exit by pressing any measurement key b pH Gain Calibration Important Always calibrate or verify your POOLPRO with a pH 7 buffer solution before adjusting the gain with acid or base buffers i e 4 and or 10 etc Either acid or base solution can be...

Page 39: ...continue with 3rd point calibration use basic buffer if acidic buffer was used in the 2nd point or vice versa Again match the display to the known buffer value as in step 2 and continue with the following steps 7 Repeat steps 3 through 6 using opposite buffer solution 8 Press to accept 3rd point of calibration which completes the Calibration procedure Fill sensor well with Myron L Storage Solution...

Page 40: ...ibration is purposely limited in the POOLPRO to 10 for the conductivity cell as any change beyond that indicates damage not drift Likewise calibration changes are limited to 1 pH unit as any change beyond that indicates the end of the sensor s lifetime and replacement is recommended C Conductivity MIN SALT TDS Practices to Maintain Calibration 1 Clean oily films or organic material from the cell e...

Page 41: ...ation solutions IX MEMORY This feature allows up to 100 readings with their temperatures to be stored simultaneously for later recall At the same time the TIME and DATE are also recorded To download the memory to a computer ref bluDock Wireless Data Transfer Instructions pg 45 A Memory Storage 1 While displaying a measurement press to record the displayed value 2 MEMORY will appear and the tempera...

Page 42: ...tion before ending the recall sequence The next memory stored will go into the next highest available memory location Example You have locations 1 7 filled and wish to clear the conductivity reading stored in record location 3 and replace it with a pH reading 1 Press and scroll to location 3 2 Press and HOLD to clear old record 3 3 Fill pH ORP sensor well with sample 4 Press to measure sample and ...

Page 43: ...yed scrolling through stored readings PC OFF and CLr ALL to time e g 16 05 3 Press to initiate CAL will be displayed along with the time see Figure 8 4 Press or to change the time 5 Press to accept the change new time B Setting DATE Example shown in Figure 9 is in US format i e mo dy yr Figure 12 NOTE The default format is US Date format may be changed ref Date Format US and International Int pg 4...

Page 44: ... 25 2012 3 Press to initiate CAL will be displayed along with the YEAR see Figure 10 Figure 10 CAL 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 11 Figure 11 CAL 8 Press the or to change the day 9 Press to accept the change new day see Figure 12 next page ...

Page 45: ...at 3 Press to change Display will now indicate other format see Figures 13 14 4 Press any measurement key or allow to automatically turn off 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 15 and 16 pg 42 Figure 14 Figure 13 ...

Page 46: ... to the factory settings This might be to ensure all calibrations are set to a known value or to give the instrument to someone else free of adjustments or recorded data for a particular application NOTE All stored 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 17 ...

Page 47: ...PRO helps to mitigate contamination but NO sensor is 100 immune 1 Press 2 Press to display the stored memory records 3 Press repeatedly until you pass the FAC SEL location The display will show a CELL ch see Figure 18 4 Press to test If cell is clean Good will momentarily be displayed see Figure 19 If cell is dirty CELL cLn will be displayed see Figure 20 ref Cleaning Sensors pg 48 XIV AUTO OFF Au...

Page 48: ... The display will show Auto oFF see Figure 21 4 Press to initiate CAL will be displayed along with 15 SEC or current Auto oFF value see Figure 22 5 Press or to change the amount of time see Figure 23 Maximum time of 75 seconds is shown 6 Press to accept the change new time Figure 21 Figure 22 Figure 23 ...

Page 49: ...bsite http myronl com main U2CI_Application_DL htm 2 Upon opening select the folder for your operating system 3 Install U2CI application See detailed installation instructions on CD or Myron L website http myronl com main U2CI_Application_DL htm 4 Additional drivers may be required See our website for the latest information B Hardware Setup For a computer without Bluetooth capability If you don t ...

Page 50: ...pairing note the number of the COM port assigned by the computer In Windows XP note the number of the outgoing COM port assigned by the computer NOTE The PS9 will automatically power down after 60 sec If the PS9 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 m...

Page 51: ...ions http myronl com main U2CI_Application_DL htm 4 Upon completion click on the disconnect icon 5 Turn off POOLPRO PC download mode by selecting any measurement function Failure to do so will reduce battery life XVI CARE and MAINTENANCE P OOLPROs should be rinsed with clean water after use Solvents should be avoided Do not drop throw or otherwise strike the instrument Shock damage may cause instr...

Page 52: ...tivity cell cup should be kept as clean as possible Flushing with clean water following use will prevent buildup on electrodes However if very dirty samples particularly scaling types are allowed to dry in the cell cup a film will form This film reduces accuracy When there are visible films of oil dirt or scale in the cell cup or on the electrodes use isopropyl alcohol or a foaming non abrasive ho...

Page 53: ...liquids from the pH ORP sensor well and refill it with Myron L Storage 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 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 well w...

Page 54: ...tion in pH sensor well for long periods 2 Bulb dirty or dried out 3 Reference junction clogged or coated Unstable Conductivity TDS MIN SALT readings Dirty electrodes Unable to calibrate Conductivity TDS MIN SALT Film or deposits on electrodes Alkalinity or Hardness titration with calibration solution value not as stated on bottle 1 Method error 2 Dirty Cell Cup 3 Dirty pipette 4 Faulty pipette 5 C...

Page 55: ...and electrodes Ref Cleaning Sensors pg 48 3 Clean pipette per manufacturer s instructions 4 Use a new pipette 5 Use fresh calibration solution Be sure to use a new tip for each type of solution measured Check the ORP sensor functioning Take an ORP reading of Myron L pH ORP Sensor Storage Solution ref pH Sensor Storage Solution pg 53 If the reading is outside the range of 350 400 mV clean ONLY the ...

Page 56: ...icarbonate and 20 sodium chloride which represent the three predominant components anions in freshwater This salt ratio has conductivity characteristics 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 stan...

Page 57: ...gent H2 Reagent H2 is a low concentration 5 WV solution of Ethylenediaminetetraacetic acid EDTA required for hardness titration Order EDTA LC 5 Reagent H3 Reagent H3 is a high concentration 10 WV solution of Ethylenediaminetetraacetic acid EDTA required for hardness titration Order EDTA HC D pH Buffer Solutions pH buffers are available in pH values of 4 7 and 10 Myron L Company buffer solutions ar...

Page 58: ...cated pipette for each titration reagent Colored dots on each pipette match the colored dots on reagent solution bottles to help you avoid confusion and contamination Model PROKIT K Replacement M Pet Micropipette 1 replacement 100µL fixed volume micropipette Model FVMP 100 L M Pet Micropipette Replacement Tips Bag of 48 micropipette tips Model PTIP100 48 M bluDock Wireless Data Transfer Accessory ...

Page 59: ...nductivity instruments use an approximation of the temperature characteristics of solutions perhaps even assuming a constant value The value for KCl is often quoted simply as 2 C In fact KCl tempco varies with concentration and temperature in a non linear fashion Other solutions have more variation still The POOLPRO uses corrections that change with concentration and temperature instead of single ...

Page 60: ...d be compensated as NaCl or as 442 is illustrated in Chart 2 below Users wanting to measure natural water based solutions to 1 would have to alter the internal compensation to the more suitable preloaded 442 values or stay close to 25 C Users who have standardized to KCl based compensation may want to stick with it regardless of increasing error as you get further from 25 C The POOLPRO will provid...

Page 61: ...mpensation 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...

Page 62: ...ser to attain true TDS readings that correspond to evaporated weight XXI TEMPERATURE COMPENSATION Tempco and TDS DERIVATION The POOLPRO contains internal algorithms for characteristics of the 3 most commonly referenced compounds The solution type in use is displayed on the left When taking conductivity measurements the Solution Selection determines the characteristic assumed as the instrument repo...

Page 63: ...tion 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 9 3 The pH Sensor The active part of the pH sensor is a thin g...

Page 64: ...s may form in a layer obstructing contact with test solutions Glass surface Figure 30 KCl solution Electrode wire Electrode wire H ions Junction Plug 4 The Myron L Integral pH Sensor The sensor in the POOLPRO see Figure 29 is a single construction in an easily replaceable package The sensor body holds an oversize solution supply for long life The reference junction wick is porous to provide a very...

Page 65: ... ratio of oxidizing activity to reducing activity in a solution It is the potential of a solution to give up electrons oxidize other things or gain electrons reduce Like acidity and alkalinity the increase of one is at the expense of the other so a single voltage is called the Oxidation Reduction Potential with a positive voltage showing a solution wants to steal electrons oxidizing agent For inst...

Page 66: ... sufficient residual level of Free Available Chlorine FAC for ongoing disinfection FAC is the chlorine that remains after a certain amount is consumed by killing bacteria or reacting with other organic ammonia fecal matter or inorganic metals dissolved CO2 Carbonates etc chemicals in solution Measuring the amount of residual free chlorine in treated water is a well accepted method for determining ...

Page 67: ...LSI FUNCTIONS A Alkalinity and Hardness Titrations The PS9 uses a conductometric method of titration This means that instead of measuring a color or pH change it measures the change in conductivitywhenreagentisadded Thewaythesamplesolutionbehaves is compared to the behavior of solutions of known alkalinity or hardness under the same conditions The equivalence point is determined from the known dat...

Page 68: ...preference is set simultaneously for all three functions that capture a hardness value That means when you set the preference in one function it is set for the other two functions at the same time The LSI Calculator allows you to select either ppm or grains of hardness units The hardness unit conversion is based on the following equivalency 17 1 ppm mg L 1 grain XXIV SOFTWARE VERSION Contact the M...

Page 69: ... Hand Held Instrument on the Myron L Company website Logarithm An arithmetic function The inverse of an exponential function See pH Units pg 59 ORP Oxidation Reduction Potential or REDOX See ORP Oxidation Reduction Potential REDOX pg 61 REDOX An abbreviation for Reduction Oxidation reactions Reaction This is the basic electrochemical process by which chlorine destroys microbes by grabbing electron...

Page 70: ......

Page 71: ...ration Point Reliable Repeatable Results KCl NaCl and 442 Natural Water Modes Automatic Temperature Compensation Autoranging Durable Fully Encapsulated Electronics Waterproof Powered by 1 N Type Battery included High Performance Features ...

Page 72: ...Myron L COMPANY 2450 Impala Drive Carlsbad CA 92010 7226 USA Tel 1 760 438 2021 Fax 1 760 931 9189 E Mail info myronl com techquestions myronl com www myronl com Made In USA PS9OM 18AP12 ...

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