POOLPRO™ Operation Manual 16 November 10
PLEASE NOTE: 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.
Instrument Illustration Reference Junction under Glass pH Bulb pH/ORP Sensor (Replaceable) ORP Electrode pH Glass Electrode Conductivity Cell (Built-in Electrodes) Temperature Sensor pH/ORP Sensor Protective Cap Measurement Preprogrammed variable conductivity/ TDS ratios Units Of Measurement mS - millisiemens/cm (millimhos/cm) µS - microsiemens/cm (micromhos/cm) PPM - parts per million °C°F Date & Time displayed here COND Parameters ORP BUFFER pH TDS mV - millivolts PPM - parts per million
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I. INTRODUCTION Thank you for selecting the feature-packed PoolPro™, one of the Myron L Company’s latest in an increasing line of instruments utilizing advanced microprocessor-based circuitry and SMT manufacturing processes. This circuitry makes the instrument extremely accurate, reliable and very easy to use. The PoolPro measures conductivity, Mineral/SALT (Sodium Chloride/ NaCl), Total Dissolved Solids (TDS), pH, ORP/Redox and Temperature in one simple to use instrument.
II. • • • • • • • • • • • • • • • • • FEATURES and SPECIFICATIONS A. Features Bluetooth® wireless download capability with optional bluDock™ ORP mV to ppm free chlorine conversion Langelier Saturation Index & Hardness Calculator Ranges: Conductivity, Min/Salt, TDS — 0-200,000 µS/ppm pH − 0-14 ORP − ±999 mV; 0.20-9.99 ppm free chlorine Superior resolution 4 digit LCD displays full 9999 µS/ppm Accuracy of BETTER than ±1% of reading in a handheld instrument ±0.
C. Specification Chart pH Ranges Resolution ORP Free Chlorine Conductivity Temperature .01 pH 1 mV 0.1 ppm 0.01 (<100 µS) 0.1 (<1000 µS) 1.0 (<10 mS) 0.01 (<100 mS) 0.1 (<200 mS) 0.01 (<100 ppm) 0.1 (<1000 ppm) 1.0 (<10 ppt) 0.01 (<100 ppt) 0.1 (<200 ppt) 0.01 (<100 ppm) 0.1 (<1000 ppm) 1.0 (<10 ppt) 0.01 (<100 ppt) 0.1 (<200 ppt) 0.1° C/F ±1 mV ± 2.5% of reading ppm*** ±1% of reading ±1% of reading ±1% of reading ±0.1 °C ±.
TABLE OF CONTENTS Instrument Illustration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . i I. II. III. IV. V. VI. VII. 4 INTRODUCTION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 FEATURES and SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . 2 A. Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2 B. General Specifications . . . . . . . . . . . . . . . . . . . . . . 2 C. Specification Chart . . . . . . . . . . .
VIII. IX. X. XI. XII. XIII. XIV. XV. XVI. XVII. XVIII. XIX. CALIBRATION INTERVALS . . . . . . . . . . . . . . . . . . . . . . . . . . 17 A. Suggested Intervals . . . . . . . . . . . . . . . . . . . . . . . 17 B. Calibration Tracking Records . . . . . . . . . . . . . . . . 17 C. Conductivity, MIN/SALT, TDS Practices . . . . . . . . 18 D. pH and ORP Practices . . . . . . . . . . . . . . . . . . . . . 18 MEMORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18 A.
XX. XXI. XXII. XXIII. XXIV. XXV. XXVI. 6 CONDUCTIVITY CONVERSION to TOTAL DISSOLVED SOLIDS (TDS) . . . . . . . . . . . . . A. How it’s Done . . . . . . . . . . . . . . . . . . . . . . . . . . . . B. Solution Characteristics . . . . . . . . . . . . . . . . . . . . C. When does it make a lot of difference? . . . . . . . . TEMPERATURE COMPENSATION (Tempco) and TDS DERIVATION . . . . . . . . . . . . . . . . . . . . . . . pH and ORP . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
III. RULES of OPERATION A. Operation Using the instrument is simple: • Individual or multiple parameter readings may be obtained by filling individual sensors or entire cell cup area. • Rinse the conductivity cell or pH/ORP sensor well with test solution 3 times and refill. Temperature and/or measurement extremes will require additional rinses for maximum accuracy. • Press the desired measurement key to start measurement. Pressing the key again does no harm and restarts the 15 second auto “off” timer.
b. MIN/SALT key MIN A press of SALT displays Total Dissolved Solids with units (PPM & MIN PPT). SALT on the right. On the left is shown solution type selected (NaCl) for mineral/salt (ref. Solution Selection, pg. 11). An overrange condition will show only [- - - -]. c. TDS key A press of displays Total Dissolved Solids with units on the right. This is a display of the concentration of material calculated from compensated conductivity using the characteristics of a known material.
5. UP or DOWN Keys While measuring in any parameter, the or keys activate the Memory Store and Memory Recall functions. While in CAL mode, the keys step or scroll the displayed value up or down. A single press steps the display and holding either key scrolls the value rapidly. While in Memory Recall, the keys scroll the display up and down through the stack of records (ref. Memory Recall, pg. 19). IV. AFTER USING the PoolPro A.
1. B. Measuring pH Remove protective cap by squeezing its sides and pulling up. 2. Rinse sensor well 3 times with sample to be measured. Shake out each sample to remove any residual liquid. 3. Refill both sensor wells with sample. 4. Press 5. Note value displayed. 6. IMPORTANT: After use, fill pH/ORP sensor well with Myron L pH Sensor Storage Solution and replace protective cap.
VI. SOLUTION SELECTION A. Why Solution Selection is Available Conductivity, MIN/SALT, and TDS require temperature correction to 25°C values (ref. Standardized to 25°C, pg. 33). Selection determines the temperature correction of conductivity and calculation of TDS from compensated conductivity (ref. Cond. Conversion to TDS, pg. 36). B. The 3 Solution Types On the left side of the display is the salt solution characteristic used to model temperature compensation of conductivity and its TDS conversion.
In these first six sections, you have learned all you need to take accurate measurements. The following sections contain calibration, advanced operations and technical information. VII. CALIBRATION A. Calibration Intervals Generally, calibration is recommended about once per month with Conductivity or TDS solutions. Calibration with pH solutions should be checked twice a month. Calibration of ORP is not necessary (ref. CALIBRATION INTERVALS, pg. 17). B. Rules for Calibration of the PoolPro 1.
The becomes an “ACCEPT” key. At each point, pressing accepts the new calibration value and steps you to the next adjustment (or out of CAL mode if there are no more steps). To bypass a calibration step, just press value as is. to accept the present b. Leaving Calibration Calibration is complete when the “CAL” icon goes out. Pressing any measurement key cancels changes not yet accepted and exits calibration mode.
standard’s value (7582 >7501) or hold a key down to cause rapid scrolling of the reading. e. Press once to confirm new value and end the calibration sequence for this particular solution type. If another solution type is also to be measured, change solution type now and repeat this procedure. 2.
3. Press to verify pH calibration. If the display shows 7.00, skip the pH Zero Calibration and proceed to section b. pH Gain Calibration. 4. Press CAL BUFFER Figure 6 pH to enter calibration mode. The “CAL”, “BUFFER” and “7” annunciators will appear (see Figure 6). Displayed value will be the uncalibrated sensor. NOTES: If a wrong buffer is added (outside of 6-8 pH),“7” and “BUFFER” will flash, and the PoolPro will not adjust.
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 used for the 2nd point “Gain” calibration and then the opposite for the 3rd point. The display will verify that a buffer is in the sensor well by displaying either “Acd” or “bAS”. 1.
Exiting causes the value accepted for the buffer to be used for both acid and base measurements. To 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.
Calibration is purposely limited in the PoolPro to ±10% for the conductivity cell because more than that indicates damage, not drift. Likewise, calibration changes are limited to ±1 pH unit because more than that indicates the end of the sensor’s lifetime, and it should be replaced. C. Conductivity, MIN/SALT, TDS Practices to Maintain Calibration 1. Clean oily films or organic material from the cell electrodes with foaming cleaner or mild acid. Do not scrub inside the cell. 2.
1. 2. A. Memory Storage While displaying a measurement, press to record the displayed value. MEMORY KCl °C “MEMORY” will appear COND and the temperature display Figure 9 will be momentarily replaced by a number (1-100) showing the position of the record. Figure 9 shows a reading of 1806 µS stored in memory record #4. 1. B. Memory Recall Press any measurement key. 2. Press , “MEMORY” will appear, and the display will show the last record stored. 3.
4. Press to measure sample and press to store reading in location #3. 5. The next memory stored will go into location #8. 6. To clear all records: After pressing MEMORY , scroll down. “CLr ALL” will be displayed (see Figure 10). Figure 10 7. Press . All records will be cleared. 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.
B. Setting DATE Example shown in Figure 12, is in US format i.e. mo/dy/yr. NOTE: The default format is US. Date format may be changed (ref. Date Format “US and International (Int)”, pg. 22). Figure 12 1. Press . 2. Press repeatedly until the date is displayed (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 CAL to change the YEAR. 5.
C. DATE FORMAT “US & International (Int)” 1. Press . 2. Press repeatedly until the format is displayed (stored readings, PC OFF, CLr ALL, time, date, date format). 3. Press to change. Display will now indicate other format (see Figures 16 & 17). 4. Press any measurement key or allow to automatically turn off. (see Figures 16 &17) Figure 16 Figure 17 XI. TEMPERATURE FORMAT “Centigrade & Fahrenheit” 1. Press . 2. Press to display the stored memory records. 3.
4. Press ; the display will change to the other unit. 5. Press ; all temperature reading are now in degrees last shown. NOTE: Tempco will still be shown in %/°C. XII. TOTAL RETURN to FACTORY SETTINGS “FAC SEL” There may come a time when it would be desirable to quickly reset all the recorded calibration values in the instrument back to the factory settings.
1. Press . 2. Press to display the stored memory records. 3. Press repeatedly until Figure 21 you pass the FAC SEL location. The display will show a “CELL ch” (see Figure 21). 4. Press to test. If cell is clean, Good will momentarily be displayed (see Figure 22). If cell is dirty, “CELL cLn” will be displayed (see Figure 23), (ref. Cleaning Sensors, pg. 28). Figure 22 Figure 23 XIV.
4. Press to initiate. CAL CAL will be displayed along with the “15 SEC” (see Figure 25). 5. Press or to change the time (see Figure 26). Maximum time is shown. 6. Press Figure 25 CAL to accept the change (new time). Figure 26 XVI. bluDock™ Wireless Data Transfer INSTRUCTIONS NOTE: Bluetooth® is a registered trademark of Bluetooth SIG. The bluDock Bluetooth module is a registered Bluetooth device. Requires Myron L bluDock™ accessory package, Model # BLUDOCK.
Plug in your dongle and install per manufacturer’s instructions. For computers with Bluetooth capability/ Bluetooth dongle installed: First time use of the bluDock: 1. Press any parameter button to turn the PoolPro on. 2. Put the PoolPro in “PC On” mode by pressing the Figure 30 key until “PC OFF” appears (see Figure 30). 3. Then press the key. “PC On” will be displayed Figure 31 (see Figure 31). NOTE: “PC Ini” may momentarily be displayed while initializing (see Figure 32). 4.
testing, we cannot guarantee compatibility of all applications and formats. We suggest testing your application and format for compatibility before relying on it. Additional features, such as assigning a name to the instrument, setting time and date and erasing data are available. See U2CI software installation CD or visit our website for the latest instructions: http://myronl.com/main/U2CI_Application_DL.htm 4. 5. Upon completion, click on the “disconnect” icon.
D. Cleaning Sensors 1. Conductivity/TDS/MIN/SALT The conductivity 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 household cleaner.
“Drifting” can be caused by a film on the pH sensor bulb and/or reference. Use isopropyl alcohol (IPA) or spray a liquid cleaner such as Windex™ or Fantastic™ into the sensor well to clean it. The sensor bulb is very thin and delicate. Do not scrub or wipe the pH/ORP sensor. Leaving high pH (alkaline) solutions in contact with the pH sensor for long periods of time is harmful and will cause damage.
XVII. TROUBLESHOOTING CHART Symptom Possible Cause No display, even though measurement key pressed Battery weak or not connected. Inaccurate pH readings 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. No response to pH changes Sensor bulb is cracked or there is an electromechanical short caused by an internal crack. Will not adjust down to pH 7 pH/ORP sensor has lost KCl.
Corrective Action Check connections or replace battery (ref. Battery Replacement, pg. 27). 1. Recalibrate instrument. 2. Thoroughly rinse sensor well. 3. Recalibrate using fresh buffers (ref. pH Buffer Solutions, pg. 32). 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 and rejuvenate sensor (ref. Cleaning Sensors, pg.
XVII. ACCESSORIES A. Conductivity/TDS Standard Solutions Your PoolPro has been factory calibrated with the appropriate Myron L Company NIST traceable KCl, NaCl, and our own 442™ standard solutions. Most Myron L conductivity standard solution bottles show three values referenced at 25°C: Conductivity in microsiemens/ micromhos, the ppm/TDS equivalents based on our 442 Natural Water™ and NaCl standards. All standards are within ±1.0% of reference solutions. Available in 2 oz., quarts/liters, and gallon/~3.
Two colors to choose from; Blue - Model #: UCC Desert Tan - Model #: UCCDT ® Registered trade mark of DuPont E. Hard Protective Carry Cases Large case with 2 oz. bottles of calibration standard solutions (KCl-7000, NaCl-7500, 442-3000, 4, 7, & 10 pH buffers and pH storage solution). Model #: PKPS Small case (no calibration standard solutions) - Model #: UPP F. Replacement pH/ORP Sensor pH/ORP sensor is gel filled and features a unique porous liquid junction.
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 average values. See Chart 1. 2.500% 2.400% 2.300% 2.200% 2.100% % / °C 2.000% 1.900% 1.800% KCl % / °C 1.700% 1.600% 1.500% Temperature 0 5 10 15 20 25 30 35 40 45 50 55 60 Chart 1 C.
D. A Chart of Comparative Error In the range of 1000 µS, the error using KCl on a solution that should be compensated as NaCl or as 442, is illustrated in the graph below. 7% 442 error with KCl tempco 6% NaCl error with KCl tempco 5% 4% 3% 2% 1% 0% (1)% (2)% Temperature 0 5 10 15 20 25 30 35 40 45 50 55 Chart 2 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.
units” to compare to older published data, in terms of NaCl or 442, or may be appropriate. The PoolPro 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.
water to be pretreated by RO. Assume it is 45°C and reads 1500 µS uncompensated. 1. If NaCl compensation is used, an instrument would report 1035 µS compensated, which corresponds to 510 ppm NaCl. 2. If 442 compensation is used, an instrument would report 1024 µS compensated, which corresponds to 713 ppm 442. The difference in values is 40%.
XXII. pH and ORP A. pH 1. pH as an Indicator pH is the measurement of Acidity or Alkalinity of an aqueous solution. It is also stated as the Hydrogen Ion activity of a solution. pH measures the effective, not the total, acidity of a solution. A 4% solution of acetic acid (pH 4, vinegar) can be quite palatable, but a 4% solution of sulfuric acid (pH 0) is a violent poison. pH provides the needed quantitative information by expressing the degree of activity of an acid or base.
The problem is, on the other side of the membrane is an unknown test solution, not potassium chloride. The outside electrode, also called the Reference Junction, is of the same construction with a porous plug in place of a glass barrier to allow the junction fluid to contact the test solution without significant Glass surface Junction migration of liquids through the plug H+ ions Plug material. Figure 30 shows a typical 2 component pair.
c. Temperature Compensation pH sensor glass changes its sensitivity slightly with temperature, so the further from pH 7 one is, the more effect will be seen. A pH of 11 at 40°C would be off by 0.2 units. The PoolPro senses the sensor well temperature and compensates the reading. B. ORP/Oxidation-Reduction Potential/REDOX 1. ORP as an Indicator ORP is the measurement of the ratio of oxidizing activity to reducing activity in a solution.
are much the same as for pH. The junction side is the same, and though the platinum surface will not break like the glass pH surface, its protective glass sleeve can be broken. 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.
XXIV. GLOSSARY Anions Negatively charged ions. See Solution Characteristics, pg. 36. Algorithm A procedure for solving a mathematical problem. See Temperature Compensation and TDS Derivation, pg. 37. Logarithm An arithmetic function. See pH Units, pg. 38. Mineral 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.
XXV. ADDENDUM: New ORP ppm Free Chlorine Feature For Software V.4.2.1 and later (see pg. 41). Earlier versions may be upgraded. Contact the Myron L Company for more information: www.myronl.com A convenient new feature has been added to the POOLPRO™ that allows the user to choose between ORP millivolts (mV) and parts per million (ppm) free chlorine readings. mV and ppm free chlorine are the two most commonly used sanitizer measurement units in the pool and spa industries.
4. Press the or keys to toggle between mV and ppm free chlorine measurement format. The setting chosen is displayed (ppm shown as example below). PPM 5. 44 Press any parameter key to exit ORP unit preference selection or let the unit time out. ORP unit preference will be saved.
XXVI. ADDENDUM: NEW LSI & HARDNESS CALCULATOR The new LSI calculator makes it easy to analyze the scaling nature of water in the lab or in the field. Using a calcium carbonate saturation index algorithm developed by Dr. Wilfred Langelier in 1936, the calculator computes the saturation index of a sample based on measured and inferred values for pH, temperature, hardness and alkalinity. You can then change any of these values in “User” adjust mode to analyze the effect of the change on water balance.
A. LSI Calculator Mode 1. Press any parameter key to turn the instrument on. 2. To access the LSI calculator, press repeatedly or hold down Figure 38 (fast scroll) until “CALC LSI” is displayed (see Figure 38). 3. Press . “FILL LSI” will display (see Figure 39). 4. Rinse both the pH/ORP sensor 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.
9. The temperature value measured by the PS6SI and “°C” or “°F” will display (see example in Figure 43). Press 10. . The PS6SI generated LSI value will display (see example in Figure 44). °C Figure 43 To store this LSI value in memory, press . If you do not wish to change any of the variable values, exit the LSI calculator by pressing any parameter key or by letting the unit time out. Figure 44 B.
Press to accept the value displayed. The PS6SI inferred value for hardness and “Hrd” will display (see example in Figure 47). 4. Press the or Figure 47 keys to adjust the displayed value to the desired value. Press to accept the value displayed. The pH value measured by the PS6SI and “PH” will display (see example in Figure 48). 5. Press the or keys to adjust the displayed value to the desired value. Press Figure 48 to accept the value displayed.
C. Hardness Unit Preference Selection The LSI Calculator allows you to select either ppm or grains of hardness units for saturation index calculation. The hardness unit conversion is based on the following equivalency: 17.1 ppm (mg/L) = 1 grain The hardness range is limited to 0.0 - 1710 ppm and 0.0 - 100 grains of hardness in the PS6SI. NOTE: The PS6SI MUST be in the hardness screen (Hrd) in LSI Calculator mode or LSI Calculator “User” mode for hardness unit preference selection.
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