Myron L 6PFCE User Manual

ULTRAMETER

Operation

Manual

MODELS 6PFCE & 4P

™

20 Sep. 2013

BUFFER

°C

RATIO

% /

ORP RES TDSpHCOND

22nov11

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

(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

USER mode

for programming
special
temperature
compensation
factor and
conductivity/TDS
ratio

Displayed here:

• Temperature

readout

• USER temperature

compensation or
conductivity/TDS
ratio

• Memory Storage/

Recall

• pH Calibration

ORP

Electrode

pH Glass

Electrode

pH/ORP Sensor

(Replaceable)

For detailed explanations see Table of Contents

Temperature
Sensor

MODEL 6PFCE

Shown with bluDock™ option installed

Time & Date
displayed here

TEST Value

bluDock Enabled

i

ii

I. INTRODUCTION

Thank you for selecting the feature-packed Ultrameter II™, 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.

Model 6PIIFCE includes Myron L Company’s exclusive Free Chlorine
Equivalent (FCE) feature for making ORP-based free chlorine
measurements. Both Ultrameter IIs now also feature optional
wireless data transfer. Other features include a clock with time and date,
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 unit 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®

For your convenience, a brief set of instructions is provided on the
bottom side of your Ultrameter II. A waterproof pocket-sized card with
abbreviated instructions is also included with the instrument.

Special note ... Conductivity, resistivity, and TDS require mathematical
correction to 25°C values (ref. Temperature Compensation, pg. 39). On
the left of the Ultrameter II’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, 442™
or User. Selection affects the temperature correction of conductivity, and
the calculation of TDS from compensated conductivity (ref. Conductivity
Conversion to Total Dissolved Solids (TDS), pg. 41). 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 resistivity, and 442 (Natural Water characteristic) for TDS will reect

present industry practice for standardization. This is how your instrument,
as shipped from the factory, is set to operate. For use in sea water
desalination for example, both the conductivity and TDS may easily be
changed to NaCl.

1

II. FEATURES and SPECIFICATIONS

A. Features

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

concentration (6PFCE)

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

• Cond/TDS accuracy of ±1% of READING in a handheld instrument

±0.1% at calibration point

• All electrodes are internal for maximum protection

• Improved 4 electrode sensor technology

• Waterproof to 1 meter/3 feet

• Autoranging conductivity/TDS/resistivity

• Prompts for easy pH calibration (6PFCE)

• Factory calibrations stored in microprocessor

• 3 conductivity/TDS solution conversions preprogrammed into

microprocessor

• User mode feature allows:
Programming your own cond/TDS conversion factor

Programming your own temperature compensation factor
Disabling temperature compensation

• 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/Res/TDS Cell Material VALOX*
Cond/TDS Electrodes (4) 316 Stainless Steel
Cond/Res/TDS Cell Capacity 5 ml/0.2 oz.

pH/ORP Sensor Well Capacity 1,2 ml/0.04 oz. (6PFCE)

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

2

C. Specication Chart

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

D. Warranty/Service
The Myron L Ultrameter II, excluding the pH/ORP sensor (6PFCE), has
a Two (2) Year Limited Warranty. The pH/ORP sensor (6PFCE) has a

Six (6) Month Limited Warranty for materials and workmanship. If an
instrument fails to operate properly, see Troubleshooting Chart, pg. 36.

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: [e-mail]
[e-mail]

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 Ultrameter II only. The Myron L Company assumes
no other responsibility or liability.

E. Ultrameter II Models

3

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

E. Ultrameter II Models ....................... 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, RES and TDS Keys ........... 7

3. pH and ORP/Fr Chl Keys (6PFCE) ...... 8

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

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

IV. AFTER USING THE ULTRAMETER II .................. 9

A. Maintenance of the Conductivity Cell ..........9

B. Maintenance of the pH/ORP Sensor (6PFCE)....9

V. SPECIFIC RECOMMENDED MEASURING

PROCEDURES .............................9

A. Measuring Conductivity &

Total Dissolved Solids (TDS)............. 9

B. Measuring Resistivity .....................10

C. Measuring pH (6PFCE) ....................10

D. Measuring ORP (6PFCE)................... 10

1. ORP/FCE Mode Selection............. 11

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

E. Measuring Free Chlorine Using FCE..........12

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

2. FC

E

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 4 Solution Types .....................14

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

D. Procedure to Select a Solution ..............14

E. Application of User Solution Type ............15

1. User Programmable Temperature

Compensation (Tempco) ........15

2. Disabling Temperature Compensation ... 15

4

TABLE OF CONTENTS

3. User Programmable Conductivity to

TDS Ratio ....................16

VII. CALIBRATION .................................... 17

A. Calibration Intervals ......................17

B. Rules for Calibration of the Ultrameter II ...... 17

1. Calibration Steps .................. 17

2. Calibration Limits ..................18

C. Calibration Procedures ....................18

1. Conductivity or TDS Calibration ....... 18

2. User Calibration Conductivity/TDS.....18

3. Resistivity Calibration ............... 19

4. Reloading Factory Calibration

(Cond or TDS) ................19

5. pH Calibration (6PFCE) .............19

6. ORP Calibration (6PFCE) ............21

7. Temperature Calibration ............. 21

VIII. CALIBRATION INTERVALS ......................... 22

A. Suggested Intervals ......................22

B. Calibration Tracking Records ............... 22

C. Conductivity, RES, TDS Practices............22

D. pH and ORP Practices (6PFCE) .............23

IX. MEMORY........................................23

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

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

C. Clearing a Record/Memory Clear ............24

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

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

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

C. DATE FORMAT “US & International (Int)” ...... 26

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

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

XIII. CELL CHECK .................................... 28

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

XV. USER Mode CALIBRATION LINC™ FUNCTION .........29

A. Calibration of Ultrameter II for use in

User mode .......................... 29

B. Setting User mode Calibration “Linc” .........30

C. Canceling User mode Calibration “Linc” .......31

XVI. bluDock™ Wireless Data Transfer Instructions........... 32

A. Software Installation ...................... 32

B. Hardware Setup .........................32

C. Memory Stack Download ..................33

XVII. CARE and MAINTENANCE .........................34

5

TABLE OF CONTENTS

A. Temperature Extremes .................... 34

B. Battery Replacement...................... 34

C. pH/ORP Sensor Replacement (6PFCE) ....... 34

D. Cleaning Sensors ........................ 34

XVIII. TROUBLESHOOTING CHART ....................... 36

XIX. ACCESSORIES...................................38

A. Conductivity/TDS Standard Solutions .........38

B. pH Buffer Solutions (6PFCE) ................ 38

C. pH Sensor Storage Solution (6PFCE) .........38

D. ORP Sensor Conditioner Solution (6PFCE)..... 38

E. Soft Protective Carry Cases ................ 39

F. Hard Protective Carry Cases ...............39

G. Replacement pH/ORP Sensor (6PFCE) ....... 39

H. bluDock™ Wireless Data Transfer

Accessory Package ................... 39

XX. TEMPERATURE COMPENSATION (Tempco)

of Aqueous Solutions ........................ 39

A. Standardized to 25°C ..................... 39

B. Tempco Variation.........................39

C. An Example of 2 different solution selections and

the resulting compensation ............. 40

D. A Chart of Comparative Error ............... 40

E. Other Solutions ..........................41

XXI. CONDUCTIVITY CONVERSION to

TOTAL DISSOLVED SOLIDS (TDS) ............41

A. How it’s Done ...........................42

B. Solution Characteristics ...................42

C. When does it make a lot of difference?........ 42

XXII. TEMPERATURE COMPENSATION (Tempco)

and TDS DERIVATION....................... 43

A. Conductivity Characteristics ................ 43

B. Finding the Tempco of an Unknown Solution ... 43

C. Finding the TDS Ratio of an Unknown Solution ....43

XXIII. pH and ORP (6PFCE) ...............................44

A. pH (6PFCE) .............................44

B. ORP/Oxidation-Reduction Potential/

REDOX (6PFCE) .....................46

C. Free Chlorine Equivalent ..................47

1. FCE as an Indicator of Sanitizing

Strength .....................47

2. FCE Units ........................ 47

XXIV. SOFTWARE VERSION ............................. 48

XXV. GLOSSARY......................................49

6

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 (6PFCE) 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 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 Ultrameter II 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 (ref. Auto oFF, pg. 28).

• Rarely is it necessary to press and

to Select a Solution, pg. 14; or Conductivity or TDS Calibration,

pg. 18).

C. Operation of the Keys (See Instrument Illustration, pg. i)

1. Measurement Keys in General
Any of the 5 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).

hold

a key (as in Procedure

2. COND, RES 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 or User),

refer to Why Solution Selection is Available, pg. 14 and
Procedure to Select a Solution, pg. 14.
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.

7

b. RES Key

ORP

Fr Chl

ORP

Fr Chl

A press of displays resistivity with units on the right. On the left

is shown solution type selected for resistivity (ref. Solution Selection, pg.

14). The range of display of resistivity is limited to between 10 kilohms

(KΩ) and 30 megohms (MΩ). A solution outside that range will only show

[- - - -] in the display.
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 (6PFCE)
Measurements are made on solution held in the pH/ORP sensor well
(ref. pH and ORP, pg. 44). The protective cap is removed and the sensor
well is lled and rinsed with the sample enough times to completely

replace the storage solution.

After use, the pH/ORP sensor well must be relled with Myron L Storage

Solution, and the protective cap reinstalled securely (ref. Maintenance

of the pH/ORP Sensor, pg. 9 and Cleaning Sensors, 2. pH/ORP, pg. 34).
a. pH Key (6PFCE)

A press of

b. ORP/Fr Chl Key (6PFCE)

displays pH readings. No units are displayed on the right.

In ORP mode, a press of

displays Oxidation-Reduction

Potential/REDOX reading in millivolts; “mV” is displayed.

When the FCE mode is activated, a press of

displays the Free

Chlorine Equivalent reading in “ppm” alternating with the FCE predictive
ORP reading in “mV”.

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).

If

is held down for about 3 seconds when the ORP or FCE

functions are active, CAL mode is not entered. Instead either “OrP” or
“Chl” will appear depending on which mode is active. Change modes
by pressing the Up or Down buttons. Press any parameter key to
exit ORP unit preference selection or let the unit time out. ORP unit
preference will be saved.

8

If is held down for about 3 seconds at any other time, CAL mode

but “SEL” appears to allow Solution Selection (ref. pg. 14) with the Up
or is not entered, 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. 24).

5. UP or DOWN Keys

While measuring in any parameter, the or

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 ULTRAMETER II
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 (ref. Cleaning

Sensors, pg. 34). Even if a very active chemical discolors the electrodes,
this does not affect the accuracy; leave it alone.

keys activate

B. Maintenance of the pH/ORP Sensor (6PFCE)
The sensor well must be kept wet with a saline solution. Before replacing

the rubber cap, rinse and ll the sensor well with Myron L pH Sensor

Storage Solution. If unavailable, use an almost saturated KCl solution,

pH 4 buffer or a saturated solution of table salt and tap water (ref.
pH and ORP Practices to Maintain Calibration, pg. 23). NEVER USE

DISTILLED WATER.

V. SPECIFIC RECOMMENDED MEASURING PROCEDURES
If the proper solution is not selected (KCl, NaCl, 442 or User), 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 & 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.

9

3. Press or .

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

B. Measuring Resistivity
Resistivity is for low conductivity solutions. In a cell cup the value may
drift from trace contaminants or absorption from atmospheric gasses, so

measuring a owing sample is recommended.

1. Ensure pH protective cap is secure to avoid contamination.

2. Hold instrument at 30° angle (cup sloping downward).

3. Let sample ow continuously into conductivity cell with no aeration.

4. Press

key; use best reading.

NOTE: If reading is lower than 10 kilohms display will be dashes:
[ - - - - ]. Use Conductivity.

C. Measuring pH (6PFCE)

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

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

3. Rell both sensor well and cell cup 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, 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.

34).

The Ultrameter II 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.

D. Measuring ORP

.

10

1. ORP / FCE Mode Selection

PPM

The Ultrameter II 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

for approximately 3 seconds.

The current preference for ORP units of measure is displayed. Factory
setting for this preference is ORP mV.

3. Press the or

keys to toggle between mV (standard

ORP mode) and FCE ppm. The setting chosen is displayed.

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 6PFCE is in ORP mode (ref. ORP 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.

11

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. 34). Do not allow pH/ORP sensor to dry out.

E. Measuring Free Chlorine Using FC

E

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
6PFCE 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 6PFCE 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.

12

6. Press

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,

. The instrument will begin alternating between a

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-”).

13