Myron L PS6FCE User Manual

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POOLPRO

Operation

Manual

™

MODEL PS6FC

17 June 2013

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.com

BUFFER

°C°F

ORP TDSpHCOND

PS6FC

MIN

SALT

bluDock Enabled

Reference Junction under Glass pH Bulb

These Measurement keys will:

• Turn instrument on

• Measure parameter

• Exit any function

(Built-in

Electrodes)

Preprogrammed variable conductivity/ TDS ratios

Parameters

Wrist/neck strap slot

(strap user supplied)

pH/ORP Sensor Protective Cap

This key for:

• Calibration

• Memory Clear

• Solution Selection

• Confirmation

Up key/Memory Store

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 OOLP RO

™

Units Of Measurement

Parameter

mS - millisiemens/cm

(millimhos/cm)

µS - microsiemens/cm

(micromhos/cm)

PPM - parts per million

PPT - parts per thousand

mV - millivolts

Conductivity

MIN/SALT

TDS

ORP

Mineral/Salt TDS of NaCl

24 January 2012

Free Chlorine

For detailed explanations see Table of Contents

MODEL PS6FCE

Shown with bluDock™ option installed

I. INTRODUCTION

Thank you for selecting the feature-packed Po o l Pr o ™, 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 Po o l Pr o now includes Myron L Company’s exclusive Free Chlorine Equivalent (FCE) feature for making ORP-based free chlorine measurements, as well as bluDock™ option. You can also measure conductivity, Mineral/SALT (Sodium Chloride/NaCl), Total Dissolved Solids (TDS), pH, ORP/Redox and Temperature, all with one simple-to-use instrument. Additional features include a clock with time and date, a memory of up to 100 locations with time and date stamp, the ability of the user to adjust the timeout “Auto OFF”, and enhanced performance. See Features and

Specications on pages 2 & 3.

The most exciting new feature is data logging with the ability to download the memory or stored test data wirelessly with its corresponding time, date and instrument name. This feature allows the user to create spreadsheets and graphs with ease, and quickly and accurately manipulate data more effectively. The optional bluDock™ 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 format for compatibility before relying on it.

Bluetooth®

wireless data transfer with the

For your convenience, a brief set of instructions is provided on the bottom side of your Po o l Pr o .

Special note.....Conductivity, Mineral/Salt, and TDS require mathematical

correction to 25°C values (ref. Temperature Compensation, pg. 37). On the left of the Po o l Pr o ’s liquid crystal display is shown an indicator of the salt solution characteristic used to model temperature compensation of conductivity and its TDS conversion. The indicator may be KCl, NaCl, or 442™. Selection affects the temperature correction of conductivity, and the calculation of TDS from compensated conductivity (ref. Conductivity Conversion to Total Dissolved Solids (TDS), pg. 40). The selection can affect the reported conductivity of hot or cold solutions, and will change the reported TDS of a solution. Generally, using KCl for conductivity,

NaCl for Mineral/Salt, and 442 for TDS will reect present industry

practice for standardization. This is how your instrument, as shipped from the factory, is set to operate.

II. FEATURES and SPECIFICATIONS

A. Features

• ORP-based FCE free chlorine measurement, displayed as ppm

concentration

• Ranges:

Conductivity, Min/Salt, TDS — 0-200,000 µS/ppm pH − 0-14 ORP − ±999 mV; 0.00-9.99 ppm free chlorine

• Superior resolution 4 digit LCD displays full 9999 µS/ppm

• Accuracy of BETTER than ±1% of reading in a handheld instrument

±0.1% at calibration point

• All sensors are internal for maximum protection

• Improved 4 electrode sensor technology

• Waterproof to 1 meter/3 feet

• Autoranging conductivity/TDS

• Factory calibrations stored in microprocessor

• Prompts for easy pH calibration

• 3 conductivity/TDS solution conversions preprogrammed 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”

•

Bluetooth®

wireless download capability with optional bluDock™

B. General Specications 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/SALT/TDS Cell Capacity 5 ml/0.2 oz. pH/ORP Sensor Well Capacity 1,2 ml/0.04 oz. Power 9V Alkaline Battery Battery Life >100 Hours/5000 Readings Operating/Storage Temperature 0-55°C/32-132°F Protection Ratings IP67/NEMA 6 (waterproof to 1 meter/3 feet)

EMI/EMC Ratings EN61326-1: 2006 + Annex A: 2008 (hand-held devices)

(Conformité Européenne)

CISPR 11: 2003 IEC 61000-4-2: 2001 and, IEC 61000-4-3: 2002

* ™ SABIC Innovative Plastics IP BV

Additional information is available on our website:

www.myronl.com

MADE IN USA

C. Specication Chart

If either ORP or pH is outside the specied limits, the instrument will display “-Or-”.

Mineral/Salt*

NaCl - Sodium Chloride

D. Warranty/Service

The Myron L Po o l Pr o ™, 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. 34. The battery and pH/ORP sensor are user-replaceable. For other service, return the instrument prepaid to the Myron L Company.

MYRON L COMPANY

2450 Impala Drive

Carlsbad, CA 92010-7226 USA

+1-760-438-2021 E-Mail: info@myronl.com techquestions@myronl.com

www.myronl.com

If, in the opinion of the factory, failure was due to materials or workmanship, repair or replacement will be made without charge. A reasonable service charge will be made for diagnosis or repairs due to normal wear, abuse or tampering. This warranty is limited to the repair or replacement of the Po o l Pr o only. The Myron L Company assumes no other responsibility or liability.

TABLE OF CONTENTS

Instrument Illustration .......................................i

I. INTRODUCTION ................................... 1

II. FEATURES and SPECIFICATIONS ....................2

A. Features ................................2

B. General Specications .....................2

C. Specication Chart ........................3

D. Warranty/Service..........................3

III. RULES of OPERATION.............................. 7

A. Operation ...............................7

B. Characteristics of the Keys ..................7

C. Operation of the Keys ......................7

1. Measurement Keys in General......... 7

2. COND, MIN/SALT & TDS Keys ........7

3. pH and ORP/Fr Chl Keys .............8

4. CAL/MCLR Key .................... 8

5. UP or DOWN Keys..................9

IV. AFTER USING the Po o l Pr o .......................... 9

A. Maintenance of the Conductivity Cell ..........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..........................10

1. ORP/FCE Mode Selection............. 10

2. Measuring ORP .................... 11

D. Measuring Free Chlorine Using FCE..........12

1. Prepare for FCE Measurement ......... 12

2. FC

Flow Method ................... 12

3. FCE Immersion Method............... 13

4. FCE Best Practices .................. 14

VI. SOLUTION SELECTION............................14

A. Why Solution Selection is Available ..........14

B. The 3 Solution Types .....................14

C. Calibration of Each Solution Type ............ 14

D. Procedure to Select a Solution .............. 15

VII. CALIBRATION.................................... 16

A. Calibration Intervals ......................16

B. Rules for Calibration of the Po o l Pr o .......... 16

1. Calibration Steps .................. 16

2. Calibration Limits ..................17

C. Calibration Procedures .................... 17

1. Conductivity, MIN/SALT &TDS

Calibration....................17

2. Reloading Factory Calibration ........ 18

3. pH Calibration ....................18

4. ORP/Fr Chl Calibration .............21

5. Temperature Calibration............. 21

VIII. CALIBRATION INTERVALS .........................21

A. Suggested Intervals ......................21

B. Calibration Tracking Records ............... 21

C. Conductivity, MIN/SALT, TDS Practices .......22

D. pH and ORP Practices ....................22

IX. MEMORY........................................22

A. Memory Storage .........................23

B. Memory Recall ..........................23

C. Clearing a Record/Memory Clear ............ 23

X. TIME and DATE................................... 24

A. Setting TIME ............................24

B. Setting DATE............................25

C. Date Format (US & International) ............ 26

XI. TEMPERATURE FORMAT “Centigrade & Fahrenheit” ..... 26

XII. TOTAL RETURN to FACTORY SETTINGS..............27

XIII. CELL CHECK ....................................27

XIV. AUTO OFF ......................................28

XV. bluDock™ WIRELESS DATA TRANSFER INSTRUCTIONS ...29

A. Software Installation ......................29

B. Hardware Setup .........................30

C. Memory Stack Download ..................30

XVI. CARE and MAINTENANCE .........................31

A. Temperature Extremes ....................31

B. Battery Replacement...................... 31

C. pH/ORP Sensor Replacement ..............31

D. Cleaning Sensors ........................32

XVII. TROUBLESHOOTING .............................34

XVIII. ACCESSORIES...................................36

A. Conductivity/TDS Standard Solutions .........36

B. pH Buffer Solutions .......................36

C. pH Sensor Storage Solution ................ 36

D. ORP Sensor Conditioner Solution............36

E. Soft Protective Carry Cases ................37

F. Hard Protective Carry Cases ...............37

G. Replacement pH/ORP Sensor ..............37

H. bluDock™ Wireless Data Transfer

Accessory Package ................... 37

XIX. TEMPERATURE COMPENSATION (Tempco)

of Aqueous Solutions ........................37

A. Standardized to 25°C ..................... 37

B. Tempco Variation.........................37

C. An Example............................. 38

D. A Chart of Comparative Error ...............39

E. Other Solutions ..........................39

XX. CONDUCTIVITY CONVERSION to

TOTAL DISSOLVED SOLIDS (TDS) ............40

A. How it’s Done ...........................40

B. Solution Characteristics ...................40

C. When does it make a lot of difference?........ 40

XXI. TEMPERATURE COMPENSATION (Tempco)

and TDS DERIVATION .......................41

XXII. pH and ORP .....................................42

A. pH ....................................42

B. ORP/Oxidation-Reduction Potential/REDOX ...44

C. Free Chlorine ...........................45

1. FCE as an Indicator of Sanitizing

Strength ..................... 45

2. FCE Free Chlorine Units ............. 45

XXIII. SOFTWARE VERSION .............................46

XXIV. GLOSSARY......................................47

III. RULES of OPERATION

A. Operation Using the instrument is simple:

• Individual or multiple parameter readings may be obtained by lling individual sensors or entire cell cup area.

• Rinse the conductivity cell or pH/ORP sensor well with test solution 3 times and rell. 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.

• Note the value displayed or press the MS key to store the

reading (ref. Memory Storage, pg. 23). It’s that simple!

B. Characteristics of the Keys

• Though your Po o l Pr o has a variety of sophisticated options, it is designed to provide quick, easy, accurate measurements by simply pressing one key.

• All functions are performed one key at a time.

• There is no “off” key. After 15 seconds of inactivity the

instrument turns itself off (60 seconds in CAL mode). User adjustable up to 75 seconds.

• Rarely is it necessary to press and

to Select a Solution, pg. 15; or Cond. MIN/SALT or TDS Calibration, pg.17).

hold

a key (as in Procedure

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 the display, and the measurement units appear at the right. Pressing a measurement key does this even if you are in a calibration sequence and also serves to cancel a change (ref. Leaving Calibration, pg. 17).

2. COND, MIN/SALT and TDS Keys These 3 keys are used with solution in the Conductivity Cell. Precautions:

• While lling cell cup ensure no air bubbles cling on the cell wall.

• If the proper solution is not selected (KCl, NaCl, 442),

refer to Why Solution Selection is Available, pg. 14 and Procedure to Select a Solution, pg. 15. a. COND Key Solution to be tested is introduced into the conductivity cell and a press

of displays conductivity with units on the right. On the left is

shown the solution type selected for conductivity.

b. MIN/SALT key

MIN

SALT

A press of

displays Total Dissolved Solids with units (PPM &

PPT).

on the right. On the left is shown solution type selected (NaCl) for mineral/salt (ref. Solution Selection, pg. 14). 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. On the left is shown solution type selected for TDS (ref. Solution Selection, pg. 14).

3. pH and ORP/Fr Chl Keys Measurements are made on solution held in the pH/ORP sensor well (ref. pH and ORP, pg. 42). The protective cap is removed and the sensor

well is lled and rinsed with the sample enough times to completely

replace the pH Sensor Storage Solution.

After use, the pH/ORP sensor well must be relled 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. 32). a. pH Key A press of right.

displays pH readings. No units are displayed on the

b. ORP/Fr Chl Key A press of

displays Oxidation-Reduction Potential/REDOX

reading in millivolts, “mV” is displayed.

4. CAL/MCLR Key

A press of

allows you to enter the calibration mode while

measuring conductivity, TDS or pH. 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. 17).

is held down for about 3 seconds, CAL mode is not entered, but

“SEL” appears to allow Solution Selection (ref. pg. 14) with the Up or Down keys. As in calibration, the CAL key is now an “accept” key. While reviewing stored records, the MCLR side of the key is active to allow clearing records (ref. Clearing a Record/Memory Clear, pg. 23).

5. UP or DOWN Keys

MIN

SALT

While measuring in any parameter, the

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. 23).

IV. AFTER USING the Po o l Pr o A. Maintenance of the Conductivity Cell Rinse out the cell cup with clean water. Do not scrub the cell. For oily

lms, squirt in a foaming non-abrasive cleaner and rinse. Even if a

very active chemical discolors the electrodes, this does not affect the accuracy; leave it alone. (ref. Cleaning Sensors, pg. 32)

B. Maintenance of the pH/ORP Sensor The sensor well must be kept wet with a solution. Before replacing

the rubber cap, rinse and ll 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. 22).

V. SPECIFIC RECOMMENDED MEASURING PROCEDURES

If the proper solution is not selected (KCl, NaCl, 442), see Solution Selection, pg. 14.

NOTE: After sampling high concentration solutions or temperature extremes, more rinsing may be required. When sampling low conductivity solutions, be sure the pH cap is well seated so that no solution washes into the conductivity cell from around the pH cap.

A. Measuring Conductivity MIN/SALT & Total Dissolved Solids (TDS)

1. Rinse cell cup 3 times with sample to be measured. (This conditions the temperature compensation network and prepares the cell.)

2. Rell cell cup with sample.

3. Press

4. Take reading. A display of [- - - -] indicates an overrange condition.

B. Measuring pH

1. 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. Rell both sensor wells with sample.

4. Press .

5. Note value displayed.

6. IMPORTANT: After use, ll pH/ORP sensor well with Myron L pH Sensor Storage Solution and replace protective cap. If Myron L pH Sensor Storage Solution 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. 32).

C. Measuring ORP The PS6 features the ability to measure the activity of oxidizing or reducing chemicals in solution as ORP mV. The instrument also includes an innovative Free Chlorine Equivalent (FCE) feature (Measuring Free Chlorine Using FCE, pg. 12) that uses ORP and pH to measure free available chlorine (FAC) concentration in ppm. ORP mV and ppm of free available chlorine (FAC) are the two most commonly used sanitizer units of measure in water quality management.

Do not allow pH/ORP sensor to dry out.

1. ORP / FCE Mode Selection The PS6 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 modes:

1. Press

2. Press and hold

The current preference for ORP units of measure is displayed.

Factory setting for this preference is ORP mV. (See Figure 1, next page.)

for approximately 3 seconds.

Figure 1

3. Press the or

Figure 2

PPM

keys to toggle between mV (standard

ORP mode) and FCE ppm. The setting chosen is displayed. (See Figure 2.)

4. Press any parameter key to exit ORP unit preference selection or let the unit time out. ORP unit preference will be saved.

2. Measuring ORP

1. Ensure the PS6FCE is in ORP mode (ref. ORP/FCE Mode Selection, pg. 10).

2. Remove protective cap by rotating while grasping and pulling up.

3. Rinse sensor well and cell cup 3 times with sample to be measured. Shake out each sample to remove any residual liquid.

4. Rell both sensor well and cell cup with sample.

5. Press .

6. Take reading.

7. Press MS to store reading in memory, if desired.

IMPORTANT: After use, ll pH/ORP sensor well with Myron L

pH Sensor Storage Solution and replace protective cap. If

Myron L pH Sensor Storage Solution 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. 32). Do not allow pH/ORP sensor to dry out.

D. Measuring Free Chlorine Using FC

The FCE function can be used to measure discrete samples, owing 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 owing samples. Use the FCE

Immersion Method described in section 3 below in situations where the PS6FCE can be dipped to obtain a sample. Read through section 4. FCE Best Practices before you begin.

1. Prepare for FCE Measurement

1. For ease of measurement, set the instrument’s Auto oFF feature to 75 sec (ref. Auto oFF, pg. 28).

2. Ensure the FCE mode has been activated (ref. ORP/FCE Mode Selection, pg. 10).

3. Remove protective cap from the pH/ORP sensor by rotating while grasping and pulling up.

2. FCE Flow Method

1. Empty the pH/ORP sensor well of all storage solution.

2. Hold the PS6FCE at a 30º angle (cup sloping downward).

3. Thoroughly ush the sensor well and cell cup with a steady

stream of the solution you intend to measure by allowing the

solution to ow into and out of the sensor well and cell cup for at

least 10 seconds.

4. Let sample ow continuously into conductivity cell with no

aeration.

5. Allow both the sensor well and cell cup to remain lled with

sample.

6. Press

. The instrument will begin alternating between a

predicted nal ORP value and a free chlorine equivalent

concentration in ppm. Both readings will change rapidly at

rst.

7. Wait for the readings to stabilize. When the mV and ppm values are unchanging for 5 consecutive readings, the FCE reading has reached a stable level. This may take 1 to 2 minutes.

NOTE: If the reading takes more than 1 minute to stabilize,

press the

from disturbing the measurement process. Annunciators will

alert you when either the pH or ORP of the nal 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 around for at least 10 seconds to thoroughly rinse the cell cup and sensor well.

3. Continue holding the instrument under the surface while taking the reading.

4. Press .

5. The instrument will begin alternating between a predicted nal

ORP value and a free chlorine equivalent concentration in ppm.

Both readings will change rapidly at rst.

after 1 minute to prevent Auto oFF feature

6. Wait for the readings to stabilize. When the mV and ppm values are unchanging for 5 consecutive readings, the FCE reading has reached a stable level. This may take 1 to 2 minutes. NOTE: If the reading takes longer than 1 minute to stabilize,

press after 1 minute to prevent Auto-OFF feature from

disturbing the measurement process. Annunciators will alert

you when either the pH or ORP of the nal FCE ppm value are

Out of Range (“-Or-”).

7. Press MS to store reading in memory if desired.

4. FCE Best Practices

For best results it is recommended that you:

1. Take 3 consecutive FCE measurements and record the readings.

2. Calculate the average of the 3 measurements. Use this value.

3. Ignore measurements that are signicantly different from the

others. Ex: 3.20 ppm, 1.15 ppm, 3.10 ppm

IMPORTANT: After use, ll pH/ORP sensor well with Myron L pH

Sensor Storage Solution and replace protective cap. If Myron L pH Sensor Storage Solution 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. 32). Do not allow pH/ ORP sensor to dry out.

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. 37). Selection determines the temperature correction of conductivity and calculation of TDS from compensated conductivity (ref. Cond. Conversion to TDS, pg. 40).

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. Generally, using KCl for Conductivity, NaCl for Mineral/

Salt, and 442 (Natural Water characteristic) for TDS will reect present

industry practice for standardization. This is the setup as shipped from the factory (ref. Solution Characteristics, pg. 40).

C. Calibration 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, MIN/SALT or TDS Calibration, pg. 17) is performed separately for each type of solution one wishes to measure (ref. Conductivity/TDS Standard Solutions, pg. 36).

D. Procedure to Select a Solution

MIN

SALT

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.

F igure 3

K C l

442

Na C l

NOTE: Check display to see if solution displayed (KCl, NaCl, 442) is already the type desired. If not:

1. Press

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 3).

(For demonstration purposes, all 3 solution types are shown simultaneously.)

3. Use the

key to select type of solution desired

(ref. Solution Characteristics, pg. 40). The selected solution type will be displayed: KCl, NaCl, or 442.

4. Press

to accept new solution type.

VII. CALIBRATION

KCl, NaCl or 442

Cond Gain only

MIN/SALT

TDS Gain only

pH 7, acid and/or base

ORP Zero set with pH 7 automatically

Gain only

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. 21).

B. Rules for Calibration of the Po o l Pr o

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 conductivity or TDS mode.

Depending on what is being calibrated, there may be 1, 2 or 3 steps to the calibration procedures.

The

MIN

SALT

Figure 4

°C

NaCl

COND

CAL

µS

7582

23.8

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 to accept the present value as is.

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. Leaving pH after the 2nd buffer results in the same gain being entered in place of the 3rd buffer.

2. Calibration Limits There are calibration limits. A nominal “FAC” value is an ideal value stored by the factory. Attempts 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. 34).

C. Calibration Procedures

1. Conductivity, MIN/SALT or TDS Calibration

becomes an “ACCEPT” key. At each point, pressing

a. Rinse conductivity cell three times with proper standard (KCl, NaCl, or 442) (ref. Cond/TDS Standard Solutions, pg. 36).

b. Rell conductivity cell with same standard. NACL-7500 shown.

c. Press

press

appear on the display (see Figure 4).

d. Press or to

to step the displayed value toward the standard’s value (7582

, “CAL” icon will

, then

>7501) or hold a key down to cause rapid scrolling of the

MIN

SALT

reading.

e. Press

once to conrm 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. Reloading Factory Calibration

(Cond, MIN/SALT or TDS) If calibration is suspect or known to be incorrect, and no standard solution is available, the calibration value can be replaced with the original factory value for that solution. This “FAC” value is the same for all Po o l Pr o s , 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 conductivity standard solutions. If another solution type requires resetting, change solution type and repeat this procedure.

a. Press

b. Press

c. Press

key until “FAC” appears and release.

d. Press

to accept the factory calibration setting.

3. pH Calibration

Important: Always “zero” your Po o l Pr o with a pH 7 buffer solution before adjusting the gain with acid or base buffers, i.e., 4 and/or 10.

a. pH Zero Calibration

1. Rinse sensor well 3 times with 7 buffer solution.

2. Rell both sensor wells with 7 buffer solution.

3. Press

Figure 5

BUFFER

CAL

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

to enter calibration mode. The “CAL”, “BUFFER”

and “7” annunciators will appear (see Figure 5). Displayed value will be the uncalibrated sensor.

NOTES: If a wrong buffer is added (outside of 6-8 pH),“7” and “BUFFER” will ash, and the P

o o lPr o

will not adjust. The uncalibrated pH value displayed in step 4 will assist in determining the accuracy of the pH sensor. If the pH reading is above 8 with pH 7 buffer solution, the sensor well needs additional rinsing or the pH sensor is defective and needs to be replaced

5. Press

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. 34) or fresh buffer solution. The “FAC” internal electronic calibration is not intended to replace calibration with pH buffers. It assumes an ideal pH sensor. Each “FAC” indicates a factory setting for that calibration step (i.e., 7, acid, base).

You may press

reduce your variation from factory setting by pressing

to accept the preset factory value, or you may

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

Figure 6

BUFFER

CAL

Figure 7

BUFFER

CAL

Important: Always calibrate or verify your Po o l Pr o 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. The pH calibration mode is initiated by either completion of the

pH Zero Calibration, or verifying 7 buffer and pressing the twice while in pH measurement mode.

2. At this point the “CAL”, “BUFFER” and “Acd” or “bAS”

annunciators will be displayed (see Figures 6 and 7).

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. Rell sensor well again with same buffer solution.

5. Press

6. Press

until display agrees with buffer value.

to accept 2nd point of calibration. Now the

display indicates the next type of buffer to be used.

Single point Gain Calibration is complete. You may continue for the 3rd point of Calibration (2nd Gain) or exit by pressing any measurement key.

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

completes the Calibration procedure. Fill sensor well with Myron L Storage Solution and replace protective cap.

4. ORP/Fr Chl Calibration ORP electrodes rarely give false readings without problems in the reference electrode. For this reason, and because calibration solutions for ORP are highly reactive and potentially hazardous, your Po o l Pr o has an electronic ORP calibration. This causes the zero point on the reference electrode to be set whenever pH 7 calibration is done.

5. Temperature Calibration Temperature calibration is not necessary in the Po o l Pr o .

VIII. CALIBRATION INTERVALS

There is no simple answer as to how often one should calibrate an instrument. The Po o l Pr o 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 ensure specied

accuracy, any instrument must be checked against chemical standards occasionally.

A. Suggested Intervals On the average, we expect calibration need only be checked monthly for the Conductivity, MIN/SALT or TDS functions. The pH function should be checked every 2 weeks to ensure accuracy. Measuring some solutions will require more frequent intervals.

to accept 3rd point of calibration, which

B. Calibration Tracking Records To minimize your calibration effort, keep records. If adjustments you are making are minimal for your application, you can check less often. Changes in conductivity calibration should be recorded in percent. Changes in pH calibration are best recorded in pH units.

Calibration is purposely limited in the Po o l Pr o 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 lms or organic material from the cell electrodes

with foaming cleaner or mild acid. Do not scrub inside the cell.

2. Calibrate with solutions close to the measurements you make. Readings are compensated for temperature based on the type

of solution. If you choose to measure tap water with a KCl compensation, which is often done (ref. An Example, pg. 38), and you calibrate with 442 solution because it is handy, the further away from 25°C you are, the more error you

have. Your records of calibration changes will reect

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 uid washes into the conductivity cell.

D. pH and ORP Practices to Maintain Calibration

1. Keep the sensor wet with Myron L Storage Solution.

2. Rinse away caustic solutions immediately after use.

ORP calibration solutions are caustic, and ±5% is considered very accurate. By using the pH zero setting (0 mV = 7 pH) for ORP and precision electronics for detection, the Po o l Pr o delivers better accuracy without calibration than a simpler instrument could using calibration 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. 29).

A. Memory Storage

Figure 8

°C

KCl

COND

MEMORY

1. While displaying a measurement, press to record the displayed value.

2. “MEMORY” will appear and the temperature display will be momentarily replaced by a number (1-100) showing the position of the record. Figure 8 shows a reading of 1806 µS stored in memory record #4.

B. Memory Recall

1. Press any measurement key.

2. Press , “MEMORY” will appear, and the display will

show the last record stored.

3. Press

to scroll to the record location desired

(the temperature display alternates between temperature recorded and location number).

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

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 will go into the next highest available memory location.

Example:

You have locations 1-7 lled 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

Figure 9

MEMORY

Figure 10

CAL

to measure sample and press

reading in location #3.

5. The next memory stored will go into location #8.

6. To clear all records: After

to store

pressing

scroll down.

“CLr ALL” will be displayed (see Figure 9).

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. 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 10).

4. Press

to change the time.

5. Press to accept the change (new time).

B. Setting DATE

Figure 11

Figure 12

CAL

Figure 13

CAL

Figure 14

CAL

Example shown in Figure 11, 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. 26).

1. Press

2. Press repeatedly until the date is displayed (stored

readings, PC OFF, CLr ALL, time, date, i.e., 01/24/12 (January 24, 2012)).

3. Press

to initiate. CAL will be displayed along with the

YEAR, (see Figure 12).

4. Press

change the YEAR.

5. Press to accept the

change (new year).

6. Press

change the month.

7. Press

to accept the

change (new month), (see Figure 13).

8. Press

to change the day.

9. Press

to accept

the change (new day) (see Figure 14).

C. DATE FORMAT “US & International (Int)”

Figure 15

Figure 16

Figure 17

Figure 18

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 15 & 16).

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 17 and 18).

4. Press ; the display will change to the other unit.

Figure 19

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. 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 19).

4. Press

to accept the resetting. Display will return to

Conductivity mode.

XIII. CELL CHECK

The cell check veries the cleanliness of the conductivity/TDS/MIN/SALT

sensor. In normal use the cell may become dirty or coated and require cleaning. If the display is showing “.00” when the cell cup is dry, the sensor is probably clean. No matter what a manufacturer claims, a sensor can and will become contaminated or coated; therefore require cleaning. A true 4-wire sensor, as in the Po o l Pr o , helps to mitigate contamination, however, NO SENSOR IS 100% IMMUNE.

1. Press

Figure 20

Figure 21

Figure 22

Figure 23

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 20).

4. Press

to test.

If cell is clean, Good will momentarily be displayed (see Figure 21). If cell is dirty, “CELL cLn” will be displayed (see Figure 22), (ref. Cleaning Sensors, pg. 32).

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” (see Figure 23).

4. Press to initiate. CAL

Figure 24

CAL

Figure 25

CAL

will be displayed along with the “15 SEC” (see Figure

24).

5. Press

change the time (see Figure 25). Maximum time is shown.

6. Press

to accept the

change (new time).

XV. bluDock™ WIRELESS DATA TRANSFER INSTRUCTIONS

NOTE:

bluDock

Bluetooth®

Bluetooth

is a registered trademark of Bluetooth SIG. The

module is a registered

Bluetooth

device.

Requires Myron L bluDock™ accessory package, Model # BLUDOCK. Package includes Po o l Pr o hardware modication that allows the unit

to communicate wirelessly with a personal computer congured for

wireless device communication. Package also includes U2CI software application that will operate on Windows XP, Vista and 71, and Macintosh OSX2 based computer systems and computers that do not have

Bluetooth

capability.

USB adapter (dongle) for

A. Software Installation

1. Place Myron L Po o l Pr o 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 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.

1 Windows, XP, Vista, 7 & Excel are registered trademarks of Microsoft Corporation. 2 Macintosh OSX is a registered trademark of Apple Computer, Inc.

B. Hardware Setup

Figure 26

Figure 27

Figure 28

For a computer without

Bluetooth

capability: If you don’t have the dongle that came with the BLUDOCK, one can be ordered separately from the Myron L Company. Order Model # BDDO.

Plug in your dongle and install per manufacturer’s instructions.

For computers with

Bluetooth

dongle installed:

Bluetooth

capability/

First time use of the bluDock:

1. Press any parameter button to turn the Po o l Pr o on.

2. Put the Po o l Pr o in “PC On” mode by pressing the

key until “PC OFF”

appears (see Figure 26).

3. Then press the

key.

“PC On” will be displayed (see Figure 27). NOTE: “PC Ini” may momentarily be displayed while initializing (see Figure

28).

4. Add bluDock to your

Bluetooth

devices per your

operating system procedure.

THE BLUDOCK DEVICE PASSKEY IS 1234.

5. After 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 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 Po o l Pr o in “PC On” mode, open the U2CI software application.

2. Verify that the port selected matches the COM port number noted

(rst time only). This is the outgoing COM port on Windows XP.

3. In the U2CI application, click on the data download button. A

data transfer bar will appear while the data is being downloaded.

Once downloaded, the data may be manipulated, printed or stored within the Myron L U2CI application, or the data may be exported to another more powerful spreadsheet1 such as Excel2.

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. Upon completion, click on the “disconnect” icon.

5. Turn off Po o l Pr o PC download mode by selecting any measurement function. Failure to do so will reduce battery life.

XVI. CARE and MAINTENANCE

Po o l Pr o s should be rinsed with clean water after use. Solvents should be avoided. Shock damage from a fall may cause instrument failure.

A. Temperature Extremes Solutions in excess of 71°C/160°F should not be placed in the cell cup area; this may cause damage. The pH sensor may fracture if the Po o l Pr o temperature is allowed to go below 0°C/32°F. Care should be exercised not to exceed rated operating temperature.

Leaving the Po o l Pr o 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) bottom screws. Open instrument carefully. Carefully detach battery from circuit board. Replace with 9 volt alkaline battery. Replace bottom, ensuring the sealing gasket is installed in the groove of the top half of case. Re-install screws, tighten evenly and securely.

NOTE: Because of nonvolatile EEPROM circuitry, all data stored in memory and all calibration settings are protected even during power loss or battery replacement. However, loss of time and date may occur if battery is removed for longer than 3 minutes (180 seconds).

C. pH/ORP Sensor Replacement Order model RPR. When ordering, be sure to include the model and

1 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.

Windows, XP, Vista, 7 & Excel are registered trademarks of Microsoft Corporation.

serial number of your instrument to ensure receipt of the proper type.

pH/ORP SENSOR Top View

ORP Electrode

pH Glass Electrode

Sensor Body

Reference Junction under Glass pH Bulb

Complete installation instructions are provided with each replacement sensor.

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 lm will form. This lm reduces accuracy. When there are visible lms of oil, dirt, or scale in the cell cup or on the

electrodes, use isopropyl alcohol or a foaming non-abrasive household cleaner. Rinse out the cleaner and your Po o l Pr o is ready for accurate measurements.

2. pH/ORP The unique pH/ORP sensor in your Po o l Pr o is a nonrellable combination type that features a porous liquid junction (see Figure 29). It should not be allowed to dry out. If it does, the sensor may sometimes

be rejuvenated by rst 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 (Myron L pH/ORP Sensor Storage

Solution) — HOT tap water with table salt (NaCl) will work ne

— in the sensor well and allow to cool. Retest.

2. Pour DI water in the sensor well and allow to stand for no more

Figure 29

than 4 hours (longer can deplete the reference solution and damage the glass bulb). Retest.

If neither method is successful, the sensor must be replaced.

“Drifting” can be caused by a lm 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. Rinse such

liquids from the pH/ORP sensor well and rell 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, 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 well with clean water immediately after taking the measurement. Any sample element that reduces (adds an electron to) silver, such as cyanide, will attack the reference electrode.

Replacement sensors are available only from the Myron L Company or its authorized distributors.

XVII. TROUBLESHOOTING CHART

Symptom Possible Cause Corrective Action

No display, even though measurement key pressed

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

No response to pH changes Sensor bulb is cracked or an

Will not adjust down to pH 7 pH/ORP sensor has lost KCl. Clean and rejuvenate sensor (ref. Cleaning Sensors, pg. 32) and recalibrate. If no

pH readings drift or respond slowly to changes in buffers/samples or “FAC” is displayed repeatedly

Unstable Conductivity/TDS/ MIN/SALT readings

Unable to calibrate Conductivity/

TDS/MIN/SALT

Low ORP Reading Slow or no response to ORP changes

Battery weak or not connected. Check connections or replace battery. Ref. Battery Replacement, pg. 31.

pg. 18.

2. Cross-contamination from residual pH buffers or samples in sensor well.

3. Calibration with expired pH buffers.

electromechanical short caused by an internal crack.

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.

Dirty electrodes. Clean cell cup and electrodes. Ref. Cleaning Sensors, pg. 32.

Film or deposits on electrodes. Clean cell cup and electrodes. Ref. Cleaning Sensors, pg. 32.

ORP platinum electrode is dirty. Check the ORP sensor functioning. Take an ORP reading of Myron L pH/ORP

FCE 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. Recalibrate instrument.

2. Thoroughly rinse sensor well.

3. Recalibrate using fresh buffers. Ref. pH Buffer Solutions, pg. 36.

Replace pH/ORP sensor. Ref. Replacement pH/ORP Sensor, pg. 37.

improvement, replace pH/ORP sensor (ref. Replacement pH/ORP Sensor, pg. 37).

Clean and rejuvenate sensor (ref. Cleaning Sensors, pg. 32) and recalibrate. If no improvement, replace pH/ORP sensor (ref. Replacement pH/ORP Sensor, pg. 37).

Sensor Storage Solution (ref. pH Sensor Storage Solution, pg. 36. 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 Sensor Conditioner Solution, pg. 36), being careful not to touch the swab to the glass bulb of the pH sensor.

1. Rinse the pH/ORP sensor well briey 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.

XVIII. ACCESSORIES NOTE: MSDSs are available on the Myron L website for all solutions: http://www.myronl.com/main/Material_Safety_DS_DL.htm

A. Conductivity/TDS Standard Solutions Your Po o l Pr o 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/~3.8 liter bottles.

1. Potassium Chloride (KCl) The concentrations of these reference solutions are calculated from data in the International Critical Tables, Vol. 6. The 7000 µS is the recommended standard. Order KCL-7000

2. 442 Natural Water™ 442 Natural Water Standard Solutions are based on the following salt proportions: 40% sodium sulfate, 40% sodium bicarbonate, 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 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. Most Myron L standard solution labels show the ppm NaCl equivalent to the conductivity and to ppm 442 values. The 7500 ppm is the recommended standard. Order NACL-7500.

B. pH Buffer Solutions pH buffers are available in pH values of 4, 7 and 10. Myron L Company

buffer solutions are traceable to NIST certied pH references and are color-coded for instant identication. They are also mold inhibited and

accurate to within ±0.01 pH units @ 25°C. Order 4, 7 or 10 Buffer. Available in 2 oz., quarts/liters, and gallon/~3.8 liter bottles.

C. pH Sensor Storage Solution Myron L pH Sensor Storage Solution prolongs the life of the pH sensor. Available in 2 oz., quarts/liters, and gallon/~3.8 liter bottles.

D. ORP Sensor Conditioner Solution

Myron L ORP Conditioner Solution removes contaminants and conditions the ORP electrode.

Available in 1 oz. Order ORPCOND1OZ

E. Soft Protective Carry Cases Padded Nylon® carrying case features a belt clip for hands-free mobility. Two colors to choose from: Blue - Model #: UCC Desert Tan - Model #: UCCDT ® Registered trade mark of DuPont

F. 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

G. Replacement pH/ORP Sensor

pH/ORP sensor is gel lled and features a unique porous liquid junction.

It is user-replaceable and comes with easy to follow instructions. Model #: RPR

H. bluDock™ Wireless Data Transfer Accessory Package This accessory allows the operator to download the Po o l Pr o memory stack to a spreadsheet on a computer. The package includes bluDock

modied circuit board in the unit, software CD, installation and operating

instructions, and dongle. Model #: BLUDOCK

XIX. TEMPERATURE COMPENSATION (Tempco) of Aqueous Solutions

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.

A. Standardized to 25°C Conductivity is very accurately measured in the PoolPro by a method

that ignores ll level, electrolysis, electrode characteristics, etc., and

uses a microprocessor to perform temperature compensation. In simpler instruments, conductivity values are usually assigned an average correction similar to that of KCl solutions for correction to 25°C. The correction to an equivalent KCl solution is a standard set by chemists that standardizes the measurements and allows calibration with precise KCl solutions. In the PoolPro, this correction can be set to other solutions or tailored for special measurements or applications.

B. Tempco Variation Most conductivity 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

Chart 1

0 5 10 15 20 25 30 35 40 45 50 55 60

1.500%

1.600%

1.700%

1.800%

1.900%

2.000%

2.100%

2.200%

2.300%

2.400%

2.500%

KCl % / °C

% / °C

Temperature

solutions have more variation still. The Po o l Pr o uses corrections that change with concentration and temperature instead of single average values. See Chart 1.

C. An Example of 2 different solution selections and the resulting compensation

How much error results from treating natural water as if it were KCl at 15°C?

A tap water solution should be compensated as 442 with a 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 reading 19% low. Dividing by (.81) yields 1111 microsiemens for a compensated reading. The difference is 29 out of 1082 = 2.7%.

D. A Chart of Comparative Error

Chart 2

(1)%

(2)%

0 5 10 15 20

30 35 40 45 50

Temperature

NaCl error with KCl tempco

442 error with KCl tempco

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 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 Po o l Pr o will provide the repeatability and convertibility of data necessary for relative values for 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 under test for rated accuracy of ±1%. Many industrial applications have always been relative measurements seeking a number to indicate a certain setpoint or minimum concentration or trend. The Po o l Pr o gives the user the capacity to take data in the “KCl conductivity

units” to compare to older published data, in terms of NaCl or 442, or may be appropriate. The Po o l Pr o can be used to reconcile data taken with other compensation assumptions.

XX. CONDUCTIVITY CONVERSION to TOTAL DISSOLVED SOLIDS (TDS)

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 Po o l Pr o 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

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%.

In spite of such large error, some users will continue to take data in the NaCl mode because their previous data gathering and process monitoring was done with an older NaCl referenced device.

Those who want true TDS readings that will correspond to evaporated weight will select the correct Solution Type.

XXI. TEMPERATURE COMPENSATION (Tempco) and TDS DERIVATION

The Po o l Pr o 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 represented by the tempco, expressed in %/°C. If a solution of 100 µS at 25°C increases to 122 µS at 35°C, then a 22% increase has happened over this change of 10ºC. The solution is said to have a tempco of 2.2 %/ºC.

Tempco always varies among solutions because it is dependent on their individual ionization activity, temperature and concentration. This is why the Po o l Pr o features mathematically generated models for known salt characteristics that also vary with concentration and temperature.

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.

In a solution of one known component, pH will indicate concentration indirectly. However, very dilute solutions may be very slow reading, just because the very few ions take time to accumulate.

2. pH Units The acidity or alkalinity of a solution is a measurement of the relative availabilities of hydrogen (H+) and hydroxide (OH-) ions. An increase in (H+) ions increases acidity, while an increase in (OH-) ions increases

alkalinity. The total concentration of ions is xed as a characteristic

of water, and balance would be 10

mol/liter (H+) and (OH-) ions in a

neutral solution (where pH sensors give 0 voltage).

pH is dened 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 glass surface that is selectively receptive to hydrogen ions. Available hydrogen ions in a solution will accumulate on this surface and a charge will build up across the glass interface. The voltage can be measured with a very high impedance voltmeter circuit; the dilemma is to connect the voltmeter to solution on each side.

The glass surface encloses a captured solution of potassium chloride holding an electrode of silver wire coated with silver chloride. This is the most inert connection possible from a metal to an electrolyte. It can still produce an offset voltage, but using the same materials to connect to the solution on the other side of the membrane causes the 2 equal offsets to cancel.

The problem is, on the other side of the membrane is an unknown test

Glass surface

Figure 30

KCl solution

Electrode wire

Electrode

wire

ions

Junction Plug

KCl solution

Figure 31

Junction plug

Platinum button

H+ ions

Electrode wires

Glass

Surface

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 uid to contact the test solution without signicant

migration of liquids through the plug material. Figure 30 shows a typical 2 component pair. Migration does occur, and this limits the lifetime of a pH junction, from depletion of solution inside the reference junction or from contamination. The junction may be damaged if dried out because insoluble crystals may form in a layer, obstructing contact with test solutions. See pH/ORP, pg. 42.

4. The Myron L Integral pH Sensor The sensor in the Po o l Pr o (see Figure 31) 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 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. 42.

a. Reference Junction The most common sensor problem will be a clogged junction because a sensor was allowed to dry out. The symptom is a drift in the “zero” setting at 7 pH. This is why the Po o l Pr o does not allow more than 1 pH unit of offset during calibration. At that point the junction is unreliable.

b. Sensitivity Problems Sensitivity is the receptiveness of the glass surface, which can be

diminished by a lm on the surface. This problem also causes long

response time.

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 Po o l Pr o 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. 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 instance, chlorinated water will show a positive ORP value.

2. ORP Units ORP is measured in millivolts, with no correction for solution 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 to the solution, so the solution “ground” voltage comes from a reference junction - same as the pH sensor uses.

4. The Myron L ORP Sensor Figure 31, pg. 43, shows the platinum button in a glass sleeve. The same reference is used for both the pH and the ORP sensors. Both pH and ORP will indicate 0 for a neutral solution. Calibration at zero compensates for error in the reference junction.

A zero calibration solution for ORP is not practical, so the Po o l Pr o uses the offset value determined during calibration to 7 in pH calibration

(pH 7 = 0 mV). Sensitivity of the ORP surface is xed, so there is no

gain adjustment either.

5. Sources of Error The basics are presented in pH/ORP, pg. 42, because sources of error 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 lm will slow

the response time and diminish sensitivity. It can be cleaned off with detergent or acid, as with the pH glass.

C. Free Chlorine

1. Free Chlorine as an Indicator of Sanitizing Strength Chlorine, which kills bacteria by way of its power as an oxidizing agent, is the most popular germicide used in water treatment. Chlorine is not

only used as a primary disinfectant, but also to establish a sufcient

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 therefore the best method for determining its effectiveness in microbial control.

The Myron L Company FCE method for measuring residual disinfecting

power is based on ORP, the specic chemical attribute of chlorine (and

other oxidizing germicides) that kills bacteria and microbes.

2. FCE Free Chlorine Units The PS6FCE is the rst handheld device to detect free chlorine directly, by measuring ORP. The ORP value is converted to a concentration reading (ppm) using a conversion table developed by Myron L Company through a series of experiments that precisely controlled chlorine levels and excluded interferants.

Other test methods typically rely on the user visually or digitally interpreting a color change resulting from an added reagent-dye. The reagent used radically alters the sample’s pH and converts the various chlorine species present into a single, easily measured species. This ignores the effect of changing pH on free chlorine effectiveness and disregards the fact that some chlorine species are better or worse sanitizers than others.

The Myron L Company PS6FCE avoids these pitfalls. The chemistry of the test sample is left unchanged from the source water. It accounts for the effect of pH on chlorine effectiveness by including pH in its calculation. For these reasons, the PS6’s FCE feature provides the best reading-to-reading picture of the rise and fall in sanitizing effectivity of free available chlorine.

The PS6FCE also avoids a common undesirable characteristic of other ORP-based methods by including a unique Predictive ORP value in its FCE calculation. This feature, based on a proprietary model for

ORP sensor behavior, calculates a nal stabilized ORP value in 1 to

2 minutes rather than the 10 to 15 minutes or more that is typically required for an ORP measurement.

XXIII. SOFTWARE VERSION

Figure 32

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.

XXIV. GLOSSARY

Anions Negatively charged ions.

See Solution Characteristics, pg. 40.

Algorithm A procedure for solving a mathematical problem. See Temperature Compensation and TDS Derivation, pg. 41.

FAC Free Available Chlorine. The amount of chlorine that remains active in solution and is available for ongoing disinfection. See Free Chlorine as an Indicator, pg. 45.

FCE FCE™ directly measures ORP, the germ killing

property of chlorine and other oxidizing germicides. It displays both the ORP reading (in mVDC) as well as an equivalent free chlorine concentration (in

familiar ppm). For more information see FC

™

: Groundbreaking Measurement of Free Chlorine Disinfecting Power in a Hand-Held Instrument on

the Myron L Company website.

Logarithm An arithmetic function. The inverse of an exponential function. See pH Units, pg. 42.

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. 44.

REDOX An abbreviation for Reduction-Oxidation reactions. Reaction This is the basic electrochemical process by which

chlorine destroys microbes by grabbing electrons from the microbe’s proteins, denaturing the protein and killing the organism. ORP directly measures the strength of a solutions’ REDOX potential and, therefore, sanitizing strength.

TDS Total Dissolved Solids or the Total Conductive Ions in a solution. See Conductivity Conversion to TDS, pg. 40.

Tempco Temperature Compensation See Temperature Compensation, pg. 41.

For details on specic areas of interest refer to the Table of Contents.

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

PS6FCEOM 17JUN13

Myron L PS6FCE User Manual

Specifications and Main Features

Frequently Asked Questions

User Manual