Myron L MLJ-PS6SI User manual

16 November 10
Operation
Manual
POOLPRO™

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

i
BUFFER
°C°F
ORP TDSpHCOND
PS6
MIN
SALT
si
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
POOLPRO
™
Units Of Measurement Parameter
mS - millisiemens/cm
(millimhos/cm)
µS - microsiemens/cm
(micromhos/cm)
PPM - parts per million
PPM - parts per million
PPT - parts per thousand
mV - millivolts
Conductivity
MIN/SALT
TDS
ORP
Mineral/Salt
TDS of NaCl
13 May 10
Free Chlorine
For detailed explanations see Table of Contents
MODEL PS6si
Shown with bluDock™ option installed

ii

1
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 measures conductivity, Mineral/SALT (Sodium Chloride/
NaCl), Total Dissolved Solids (TDS), pH, ORP/Redox and Temperature
in one simple to use instrument. Model PS6si has been redesigned to
include free chlorine measurements, an LSI & Hardness Calculator for
water balance analysis, and Bluetooth® data transfer with the bluDock™
option. 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.
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,andTDS require mathematical
correction to 25°C values (ref. Temperature Compensation, pg. 33). 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. 36). 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.

2
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
±0.1% 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”
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 (6Psi)/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

3
C. Specication Chart
The LSI Calculator hardness range is limited to 0.0 - 1710 ppm and
0.0 - 100 grains of hardness.
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. 30. 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
[phone]
E-Mail: [email protected]
[email protected]
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.
0.01 (<100 ppm)
0.1 (<1000 ppm)
1.0 (<10 ppt)
0.01 (<100 ppt)
0.1 (<200 ppt)
0-9999 ppm
10-200 ppt
in 5 autoranges
0-9999 µS/cm
10-200 mS/cm
in 5 autoranges
±1% of reading
±1% of reading
±1% of reading
0.01 (<100 µS)
0.1 (<1000 µS)
1.0 (<10 mS)
0.01 (<100 mS)
0.1 (<200 mS)
0.1° C/F
.01 pH
1 mV
±0.1 °C
0-71 °C
32 - 160 °F
Auto
Temperature
Compensation
Resolution
Ranges
0-14 pH
±999 mV
Accuracy
±.01 pH**
±1 mV
0-71 °C
32 - 160 °F
0-71 °C
32 - 160 °F
0-71 °C
32 - 160 °F
0-71 °C
32 - 160 °F
Conductivity
pH
ORP
Free Chlorine
Mineral/Salt*
Temperature
TDS
0-9999 ppm
10-200 ppt
in 5 autoranges
0.01 (<100 ppm)
0.1 (<1000 ppm)
1.0 (<10 ppt)
0.01 (<100 ppt)
0.1 (<200 ppt)
Cond/TDS
Ratios
Preprogrammed
KCl, NaCl, 442™
0.2-
9.9 ppm
0.1 ppm
± 2.5% of
reading
ppm***
*NaCl - Sodium Chloride ** ± .2 in the presence of RF fields ≥ 3 V/m and > 300 MHz
***Given water is sanitized by chlorine only within 5<pH<9

4
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 Keys ..............7
3. TDS, pH and ORP 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 (mV to ppm, page 44)........10
VI. SOLUTION SELECTION............................ 11
A. Why Solution Selection is Available .......... 11
B. The 3 Solution Types ..................... 11
C. Calibration of Each Solution Type ............ 11
D. Procedure to Select a Solution .............. 11
VII. CALIBRATION....................................12
A. Calibration Intervals ......................12
B. Rules for Calibration of the Po o l Pr o ..........12
1. Calibration Steps ..................12
2. Calibration Limits ..................13
C. Calibration Procedures ....................13
1. Conductivity, MIN/SALT &TDS
Calibration....................13
2. Reloading Factory Calibration ........14
3. pH Calibration ....................14
4. ORP Calibration ...................17
5. Temperature Calibration.............17

5
VIII. 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
IX. MEMORY........................................18
A. Memory Storage .........................19
B. Memory Recall ..........................19
C. Clearing a Record/Memory Clear ............19
X. TIME and DATE...................................20
A. Setting TIME ............................20
B. Setting DATE............................21
C. US & International Format..................22
XI. TEMPERATURE FORMAT “Centigrade & Fahrenheit” .....22
XII. TOTAL RETURN to FACTORY SETTINGS..............23
XIII. CELL CHECK ....................................23
XIV. AUTO OFF ......................................24
XV. bluDock™ WIRELESS DATA TRANSFER INSTRUCTIONS ...25
A. Software Installation ......................25
B. Hardware Setup .........................25
C. Memory Stack Download ..................26
XVI. CARE and MAINTENANCE .........................27
A. Temperature Extremes ....................27
B. Battery Replacement......................27
C. pH/ORP Sensor Replacement ..............27
D. Cleaning Sensors ........................28
XVII. TROUBLESHOOTING .............................30
XVIII. ACCESSORIES...................................32
A. Conductivity/TDS Standard Solutions ......... 32
B. pH Buffer Solutions .......................32
C. pH Sensor Storage Solution ................32
D. Soft Protective Carry Cases ................32
E. Hard Protective Carry Cases ...............33
F. Replacement pH/ORP Sensor ..............33
G. bluDock™ Wireless Data Transfer
Accessory Package ...................33
XIX. TEMPERATURE COMPENSATION (Tempco)
of Aqueous Solutions ........................33
A. Standardized to 25°C .....................33
B. Tempco Variation.........................33
C. An Example.............................34
D. A Chart of Comparative Error ...............35
E. Other Solutions ..........................35

6
XX. CONDUCTIVITY CONVERSION to
TOTAL DISSOLVED SOLIDS (TDS) ............36
A. How it’s Done ...........................36
B. Solution Characteristics ...................36
C. When does it make a lot of difference?........36
XXI. TEMPERATURE COMPENSATION (Tempco)
and TDS DERIVATION .......................37
XXII. pH and ORP .....................................38
A. pH ....................................38
B. ORP/Oxidation-Reduction Potential/REDOX ...40
XXIII. SOFTWARE VERSION .............................41
XXIV. GLOSSARY......................................42
XXV. ADDENDUM: NEW ORP PPM
FREE CHLORINE FEATURE..................43
XXVI. ADDENDUM: NEW LSI & HARDNESS
CALCULATOR .............................45
A. LSI Calculator Mode ......................46
B. LSI Calculator “User” Mode.................47
C. Hardness Unit Preference Selection ..........49

7
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.19). 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 hold a key (as in Procedure
to Select a Solution, pg. 11; or Cond. or TDS Calibration, pg.12).
C. Operation of the Keys (See Instrument Illustration on pg. i)
1. Measurement Keys in General
Any of the measurement keys in the upper part of the keypad turns on
the instrument in the mode selected. The mode is shown at the bottom
of 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. 13).
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. 11 and
Procedure to Select a Solution, pg. 11.
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.

8
b. MIN/SALT key
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. 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.
On the left is shown solution type selected for TDS (ref. Solution
Selection, pg. 11).
3. pH and ORP Keys
Measurements are made on solution held in the pH/ORP sensor well
(ref. pH and ORP, pg. 38). 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. 28).
a. pH Key
A press of displays pH readings. No units are displayed on the
right.
b. ORP Key
A press of displays Oxidation-Reduction Potential/REDOX
reading in millivolts, “mV” is displayed.
4. CAL/MCLR Key
A 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. 13).
If is held down for about 3 seconds, CAL mode is not entered, but
“SEL” appears to allow Solution Selection (ref. pg. 11) 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. 19).
MIN
SALT
MIN
SALT

9
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 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. 28)
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. 18).
V. SPECIFIC RECOMMENDED MEASURING
PROCEDURES
If the proper solution is not selected (KCl, NaCl, 442), see Solution
Selection, pg. 11.
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 & 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 or .
4. Take reading. A display of [- - - -] indicates an overrange
condition.

10
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. 28). Do not allow pH/ORP sensor to dry out.
D. Measuring ORP
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. Take reading.
NOTE: When ppm free chlorine units are selected (ref. free chlorine unit
selection, pg. 43), annunciators alert you when the concentration is outside
the specied measurement range. “Or” (over range) will display when the
concentration is over the range limit (> 9.9 ppm). “Ur” (under range) will
display when the concentration is below the range limit (< 0.2 ppm).
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. 28). Do not allow pH/ORP sensor to dry out.
NOTE: FOR INFORMATION REGARDING THE ORP mV TO
ppm CONVERSION FEATURE, PLEASE SEE SECTION XXVI.
ADDENDUM, PG. 43.

11
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. 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. 36).
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 or TDS Calibration,
pg. 13) is performed separately for each type of solution one wishes to
measure (ref. Conductivity/TDS Standard Solutions, pg. 32).
D. Procedure to Select a Solution
NOTE: Check display to see if solution displayed (KCl, NaCl, 442) is
already the type desired. If not:
1. Press , or to select the parameter on
which you wish to change the
solution type.
2. Press and hold key
for 3 seconds to make
“SEL” appear (see Figure 1).
(For demonstration purposes,
all 3 solution types are shown simultaneously.)
3. Use the or key to select type of solution desired
(ref. Solution Characteristics, pg. 36). The selected solution
type will be displayed: KCl, NaCl, or 442.
4. Press to accept new solution type.
Figure 1
KCl
442
NaCl
MIN
SALT

12
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 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.
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

13
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 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. 30).
C. Calibration Procedures
1. Conductivity, MIN/SALT or TDS Calibration
a. Rinse conductivity cell three times with proper standard (KCl,
NaCl, or 442) (ref. Cond/TDS Standard Solutions, pg. 32).
b. Rell conductivity cell with same standard. NACL-7500 shown.
c. Press , or , then
press , “CAL” icon will
appear on the display
(see Figure 5).
d. Press or to or
to step the displayed value toward the
Figure 5
°C
NaCl
COND
CAL
µS
7582
23.8
MIN
SALT

14
standard’s value (7582 >7501) or hold a key down to cause
rapid scrolling of the 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 or or .
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.
MIN
SALT

15
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 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 ash, and the P o o l P r 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 or until the display reads 7.00.
NOTE: Attempted calibration of >1 pH point from factory calibration will
cause “FAC” to appear. This indicates the need for sensor replacement
(ref. Troubleshooting pg. 30) or fresh buffer solution. The “FAC” internal
electronic calibration is not intended to replace calibration with pH
buffers. It assumes an ideal pH sensor. Each “FAC” indicates a factory
setting for that calibration step (i.e., 7, acid, base).
You may press to accept the preset factory value, or you may
reduce your variation from factory setting by pressing or .
6. Press to accept the new value. The pH Zero Calibration
is now complete. You may continue with pH Gain Calibration or
exit by pressing any measurement key.
Figure 6
BUFFER
pH
CAL

16
b. pH Gain Calibration
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 7 and 8).
NOTE: If the “Acd” and “bAS” indicators are blinking, the unit is indicating
an error and needs either an acid or base solution present in the sensor
well .
3. Rinse sensor well 3 times with acid or base buffer solution.
4. Rell sensor well again with same buffer solution.
5. Press or until display agrees with buffer value.
6. Press 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.
Figure 7
BUFFER
pH
CAL
Figure 8
pH
BUFFER
CAL