Myron L 6P, 4P User Manual

ULTRAMETER

Operation

Manual

MODELS 6P & 4P

™

06 January 10

BUFFER

°C

RATIO

% /

ORP RES TDSpHCOND

04jan10

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

Instrument
Illustration

Temperature
Sensor

MODEL 6P Shown

Time & Date
displayed here

TEST Value

iii1

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.

The Ultrameter II incorporates several new features including a clock
with time and date, an increased 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 with its corresponding time and date.
This feature allows the user to create spreadsheets and graphs with
ease, and quickly and accurately manipulate data more effectively. The
optional uDock™ and software is compatible with most computers using
either Microsoft Windows XP or 2000™, or Macintosh OS9.2 or 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, on the bottom side of your Ultrameter II is a
brief set of instructions. 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. 37). 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. 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 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.

II. FEATURES and SPECIFICATIONS

A. Features

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

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

• 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 (6P).

• 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.

• Download capability with optional uDock™.

• 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/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 (6P)/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)

* ™ SABIC Innovative Plastics IP BV

Additional information is available on our website at:

www.myronl.com

2

C. Specication Chart

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

10KΩ - 30MΩ

±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)

0.01 (<100 KΩ)

0.1 (<1000 KΩ)

0.1 (>1 MΩ )

0.1 °C/F

±.01 pH

±1 mV

±0.1 °C

0-71 °C

32 - 160 °F

0 - 9.99%/ °C

Auto

Temperature

Compensation

Adjustable

Temperature

Compensation

Cond/TDS

Ratios

Preprogrammed

Resolution

Adjustable

Cond/TDS Ratio

Factor

0.20 - 7.99

KCl, NaCl, 442™

Ranges

0-14 pH

±999 mV

Accuracy

±.01 pH*

±1 mV

0-71 °C

32 - 160 °F

0 - 9.99%/ °C

0 - 9.99%/ °C

0-71 °C

32 - 160 °F

0-71 °C

32 - 160 °F

0-71 °C

32 - 160 °F

ConductivitypH (6P) ORP (6P) TDS TemperatureResistivity

* ± .2 pH in presence of RF fields ≥ 3 V/m and > 300 MHz

ULTRAMETER II MODELS 4P 6P

PARAMETERS Conductivity/TDS Conductivity/TDS/pH

Resistivity/Temp. Resistivity/ORP/Temp.

D. Warranty/Service

The Myron L Ultrameter II, excluding the pH/ORP sensor (6P), has a

Two (2) Year Limited Warranty. The pH/ORP sensor (6P) 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

[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

MADE IN USA

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 Keys (6P) . . . . . . . . . . . . . . . . . . . 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 (6P). . . . . . . . . . 9

V. SPECIFIC RECOMMENDED MEASURING PROCEDURES. . 9

A. Measuring Conductivity/Total Dissolved Solids. . . . . 9

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

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

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

VI. SOLUTION SELECTION. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11

A. Why Solution Selection is Available . . . . . . . . . . . . . .11

B. The 4 Solution Types . . . . . . . . . . . . . . . . . . . . . . . . . .11

C. Calibration of Each Solution Type . . . . . . . . . . . . . . . 11

D. Procedure to Select a Solution . . . . . . . . . . . . . . .11

E. Application of USER Solution Type. . . . . . . . . . .12

1. User Programmable Temperature

Compensation (Tempco) . . . . . . . . . . . . .12

2. Disabling Temperature Compensation . . 13

3. User Programmable Conductivity to

TDS Ratio . . . . . . . . . . . . . . . . . . . . . . . . 13

VII. CALIBRATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

A. Calibration Intervals . . . . . . . . . . . . . . . . . . . . . . . . 14

B. Rules for Calibration of the Ultrameter II . . . . . . . 14

1. Calibration Steps . . . . . . . . . . . . . . . . . . . . . . 14

2. Calibration Limits . . . . . . . . . . . . . . . . . . . . . . 15

4

C. Calibration Procedures . . . . . . . . . . . . . . . . . . . . . . . .15

1. Conductivity or TDS Calibration . . . . . . . . . .15

2. User Calibration Conductivity/TDS . . . . . . 15

3. Resistivity Calibration . . . . . . . . . . . . . . . . . . .16

4. Reloading Factory Calibration . . . . . . . . . . . .16

5. pH Calibration (6P) . . . . . . . . . . . . . . . . . . . . . 17

6. ORP Calibration (6P). . . . . . . . . . . . . . . . . . . .19

7. Temperature Calibration . . . . . . . . . . . . . . . . 19

VIII. CALIBRATION INTERVALS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

A. Suggested Intervals. . . . . . . . . . . . . . . . . . . . . . . . . . . 19

B. Calibration Tracking Records . . . . . . . . . . . . . . . . . . . 20

C. Conductivity, RES, TDS Practices. . . . . . . . . . . . . . . 20

D. pH and ORP Practices (6P). . . . . . . . . . . . . . . . . . . . . 20

IX. MEMORY . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

A. Memory Storage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21

B. Memory Recall. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

C. Clearing a Record/Memory Clear . . . . . . . . . . . . . . . . 21

X. TIME and DATE. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

A. Setting TIME . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 22

B. Setting DATE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

C. DATE FORMAT “US & International (Int)” . . . . . . . . 24

XI. TEMPERATURE FORMAT “Centigrade & Fahrenheit”. . . . . . .24

XII. TOTAL RETURN to FACTORY SETTINGS . . . . . . . . . . . . . . . . . 25

XIII. CELL CHECK . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

XIV. AUTO OFF. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

XV. USER MODE CALIBRATION LINC™ FUNCTION . . . . . . . . . . . . 27

A. Calibration of Ultrameter II for use in User Mode. . . 27

B. Setting User Mode Calibration “Linc” . . . . . . . . . . . . 28

C. Canceling User Mode Calibration “Linc” . . . . . . . . . . 29

XVI. uDock™ IR DATA PORT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

A. Software Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

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

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

XVII. CARE and MAINTENANCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

A. Temperature Extremes . . . . . . . . . . . . . . . . . . . . . . . . 32

B. Battery Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . 32

C. pH/ORP Sensor Replacement (6P). . . . . . . . . . . . . . 32

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

XVIII. TROUBLESHOOTING . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

XIX. ACCESSORIES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36

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

B. pH Buffer Solutions (6P) . . . . . . . . . . . . . . . . . . . . . . . 36

C. pH Sensor Storage Solution (6P) . . . . . . . . . . . . . . . 36

5

D. Soft Protective Carry Cases . . . . . . . . . . . . . . . . . 37

E. Hard Protective Carry Cases . . . . . . . . . . . . . . . . 37

F. Replacement pH/ORP Sensor (6P). . . . . . . . . . . . . . 37

G. uDock™ IR Data Port Accessory Package . . . . . . . 37

XX. 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

XXI. 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? . . . . . . . . . . . 41

XXII. TEMPERATURE COMPENSATION (Tempco)

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

A. Conductivity Characteristics . . . . . . . . . . . . . . . . . . . . 41

B. Finding the Tempco of an Unknown . . . . . . . . . . . . . 42

C. Finding the TDS Ratio of an Unknown . . . . . . . . . . . 42

XXIII. pH and ORP (6P) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

A. pH (6P) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 43

B. ORP/Oxidation-Reduction Potential/REDOX (6P) . . 45

XXIV. SOFTWARE VERSION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 46

XXV. GLOSSARY. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47

XXVI. ADDENDUM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48

XXVII. NOTES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 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 (6P) 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. 21). 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.

• Rarely is it necessary to press and

to Select a Solution, pg. 11; or Cond. or TDS Calibration, pg. 15).

C. Operation of the Keys (See Instrument Illustration on 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. 14).

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. 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

hold

a key (as in Procedure

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

shown the solution type selected for conductivity.

7

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

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

11). 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. 11).

3. pH and ORP Keys

Measurements are made on solution held in the pH/ORP sensor well
(ref. pH and ORP, pg. 43). 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. 32).

a. pH Key (6P)
A press of displays pH readings. No units are displayed on the
right.
b. ORP Key (6P)
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. 14).

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. 21).

8

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. 21).

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

B. Maintenance of the pH/ORP Sensor (6P)
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 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, pg. 20). 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. 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 .

9

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 (6P)

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, 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).

D. Measuring ORP (6P)

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.

10

Do not allow pH/ORP sensor to dry out.

3. Rell both sensor wells with sample.

4. Press .

5. Take reading.

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.

32).

VI. SOLUTION SELECTION

A. Why Solution Selection is Available
Conductivity, resistivity, and TDS require temperature correction to

25°C values (ref. Standardized to 25°C, pg. 38). Selection determines

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

B. The 4 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 resistivity, and 442 (Natural

Water characteristic) for TDS will reect present industry practice for

standardization. This is how your instrument is shipped from the factory
(ref. Solution Characteristics, pg. 40).

Do not allow pH/ORP sensor to dry out.

The USER selection allows a custom value to be entered for the
temperature compensation of conductivity and also the conversion ratio
if measuring TDS.

C. Calibration of Each Solution Type
There is a separate calibration for each of the 4 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. 15) 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
NOTE: Check display to see if solution displayed (KCl, NaCl, 442 or

USER) is already the type desired. If not:

1. Press , or to select the parameter on which

11

you wish to change the

Figure 1

KCl

442

NaCl

User

Figure 2

°C% /

User

COND

solution type.

2. Press and hold key

for 3 seconds to make
“SEL” appear (see Figure

1). For demonstration
purposes, all 4 solution
types are shown simultaneously.

3. Use the or key to select type of solution desired

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

4. Press to accept new solution type.

E. Application of USER Solution Type

1. User Programmable Temperature Compensation
(Tempco)
This feature allows you to change your Ultrameter II’s temperature

compensating factor to another factor between 0-9.99%/°C (ref.
Temperature Compensation, pg. 37). This feature does not apply to pH

or ORP.

a. As in Procedure to Select a Solution, pg. 11, select “USER”
mode.

b. With “USER” mode now selected, press . You may now

adjust a temperature compensation from .00%/°C to 9.99%/°C,

by pressing or .

See example in Figure 2.

c. Press twice to skip

calibration adjustment and
accept the new tempco (3
times if in TDS mode). You
are now ready to measure
samples with your new temperature compensation factor.

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2. Disabling Temperature Compensation

Figure 3

°C% /

User

COND

Figure 4

RATIO

User

TDS

In these first six sections, you have learned
all you need to make accurate measurements.
The following sections contain calibration,
advanced operations and technical information.

a. Select USER mode, see Procedure to Select a Solution, pg. 11.

b. With “USER” selected, press . If the display does not

show .00%/°C, hold long enough to bring the tempco to

.00%/°C (see Figure 3).

c. Press twice

(3 times if in TDS mode).
Temperature compensation
is now disabled (=0) for
measurements in USER mode.

3. User Programmable Conductivity to TDS Ratio
This feature allows you to select a custom conductivity to TDS conversion
ratio within the range of 0.20-7.99 for USER mode measurements.
To determine the conversion ratio for a custom solution of known TDS ppm
value, measure the solution conductivity at 25ºC with the Ultrameter II and

divide the ppm value by the µS value. For example, a solution of known 75ppm
TDS and measured 100µS conductivity at 25ºC would have a conversion
ratio of 75/100 or 0.75. Enter the new conversion ratio as follows:

a. While in “USER” mode, press .

b. Press twice (to skip over tempco adjustment) and

“RATIO” will appear (see
Figure 4).

c. Adjust with or

key until new conversion
ratio is displayed.

d. Press twice (to skip over calibration adjustment) to

accept new conversion ratio. You are now ready to measure

samples with the new conductivity/TDS ratio.

13