Myron L TH1 User Manual

™

TECHPRO

Operation

Manual

MODELS TPH1, TP1 & TH1

06 January 10

TechPro

TPH1

BUFFER

°C °F

TDS

pH

COND

06 jan 10

Wrist/neck strap slot

(strap user supplied)

pH Sensor
Protective Cap

Up key/Memory Store

Down key/Memory Recall

Displayed here:

• Temperature

readout

• Memory Storage

Location

• pH Calibration

This Key for:

• Calibration

• Memory Clear

• Solution Selection

• Confirmation

These Measurement Keys will:

• Turn instrument on

• Measure parameter

• Exit any function

Icons for pH, Conductivity or
Total Dissolved Solids (TDS)

pH Glass

Electrode

pH Sensor

(User replaceable)

Reference

Junction
(under Glass

Bulb)

Conductivity Cell
(Built-in

Electrodes)

Temperature

Sensor

Preprogrammed

conductivity/

TDS ratios

For detailed explanations, see Table of Contents

Instrument Illustration

MODEL TPH1 Shown

TDS/SalinityPPT - parts per thousand

µS - microsiemens/cm
(micromhos/cm)

mS - millisiemens/cm
(millimhos/cm)

PPM - parts per million TDS

Conductivity

Conductivity/
Salinity

TechPro

TPH1

BUFFER

°C °F

TDS

pH

COND

06 jan 10

Wrist/neck strap slot

(strap user supplied)

pH Sensor
Protective Cap

Up key/Memory Store

Down key/Memory Recall

Displayed here:

• Temperature

readout

• Memory Storage

Location

• pH Calibration

This Key for:

• Calibration

• Memory Clear

• Solution Selection

• Confirmation

These Measurement Keys will:

• Turn instrument on

• Measure parameter

• Exit any function

Icons for pH, Conductivity or
Total Dissolved Solids (TDS)

pH Glass

Electrode

pH Sensor

(User replaceable)

Reference

Junction
(under Glass

Bulb)

Conductivity Cell
(Built-in

Electrodes)

Temperature

Sensor

Preprogrammed

conductivity/

TDS ratios

For detailed explanations, see Table of Contents

Instrument Illustration

MODEL TPH1 Shown

TDS/SalinityPPT - parts per thousand

µS - microsiemens/cm
(micromhos/cm)

mS - millisiemens/cm
(millimhos/cm)

PPM - parts per million TDS

Conductivity

Conductivity/
Salinity

i

ii

I. INTRODUCTION

Thank you for selecting the feature-packed TechPro 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 TechPro II incorporates several new features including: waterproof
enclosure, keypad calibration, FULL 4 digit LCD, the addition of a 20
location memory storage, and enhanced performance to name just some
of the improvements. Additionally, “salinity” units may be selected. See

Features and Specications on pages 2 & 3.

For your convenience, on the bottom side of your TechPro II is a brief
set of instructions.

Special note ... For the TPH1 & TP1 models, conductivity and TDS
require mathematical correction to 25°C values (ref. Temperature
Compensation, pg. 25). On the left of the TechPro II’s liquid crystal
display is shown an indicator of the salt solution characteristic used to
model temperature compensation (Tempco) 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. 28).

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, 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

• Ranges:
Conductivity/TDS — 0- 20,000 µS/ppm (TPH1 & TP1)
pH — 0 -14 (TPH1 & TH1)

• Superior resolution four (4) digit LCD

• Conductivity/TDS accuracy of ±1% of reading

• pH accuracy of ±.01 pH units (TPH1 & TH1)

• All electrodes are internal for maximum protection

• Waterproof to 1 meter/3 feet

• Memory storage (20 readings)

• Autoranging Conductivity/TDS (TPH1 & TP1)

• Easy keypad calibration

• Prompts for simple pH calibration (TPH1 & TH1)

• Factory calibrations stored in microprocessor

• User selectable Conductivity/TDS modes (TPH1 & TP1)

• 3 “User Selectable” solution conversions (tempcos) (TPH1 & TP1)

• User Selectable “Salinity” units (TPH1 & TP1)

• Temperature accuracy of ±0.1°C/F

• Automatic Temperature Compensation to 25°C

• Temperature Compensation disable feature

B. General Specications
Display 4 Digit LCD

Dimensions (LxW x H) 196 x 68 x 64 mm

7.7 x 2.7 x 2.5 in.

Weight 320 g/11.2 oz.

Case Material ABS
Cond/TDS Cell Material ABS

Cond/TDS Electrodes 316 Stainless Steel

Cond/TDS Cell Capacity 5 ml/0.2 oz.

pH Sensor Well Capacity 1,2 ml/0.04 oz. (TPH1 & TH1)

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)

Additional information is available on our website at:

www.myronl.com

2

C. Specication Chart

pH

(TPH1 &

TH1)

Ranges 0-14 pH 0-9999 µS/cm

Resolution 0.01 pH 0.1 (<1000 µS)

Accuracy ±0.01 pH ±1% of reading ±0.1°C/F

Auto Temperature
Compensation

Conductivity or

TDS Ratios

0-71°C

32-160°F

Conductivity TDS Temperature

10-20 mS/cm in

3 autoranges

1.0 (<10 mS)

0.01 (>10 mS)

0-71°C

32-160°F

KCl, NaCl, or 442™

0-9999 ppm
10-20 ppt in

3 autoranges

0.1 (<1000 ppm)

1.0 (<10 ppt)

0.01 (>10 ppt)

0-71°C

32-160°F

0.1°C/F

D. Warranty/Service
The Myron L TechPro II™, excluding the pH sensor (TPH1 & TH1), has

a Two (2) Year Limited Warranty. The pH sensor (TPH1 & TH1) has a
Six (6) Month Limited Warranty. If an instrument fails to operate properly,

see Troubleshooting Chart, pg. 22. The battery and pH sensor (TPH1)
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
TechPro II only. The Myron L Company assumes no other responsibility
or liability.

E. TechPro II™ Series Models

TechPro II Models

Parameters pH & Conductivity, Conductivity,

TH1 TP1 TPH1

Temperature TDS & TDS, pH &

Temperature Temperature

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. TechPro II Series Models ................... 3

III. RULES of OPERATION.............................. 6

A. Operation ............................... 6

B. Characteristics of the Keys .................. 6

C. Operation of the Keys ...................... 6

1. Measurement Keys in General ......... 6

2. COND and TDS Keys (TPH1 & TP1) .... 6

3. pH Key (TPH1 & TH1) ............... 7

4. CAL/MCLR Key .................... 7

5. UP or DOWN Keys .................. 7

IV. AFTER USING the TechPro II ........................ 8

A. Maintenance of the Conductivity Cell

(TPH1 & TP1) ........................ 8

B. Maintenance of the pH Sensor (TPH1 & TH1) ... 8
V. SPECIFIC RECOMMENDED MEASURING PROCEDURES .. 8

A. Measuring Conductivity/ Total Dissolved Solids .. 8

B. Measuring pH (TPH1 & TH1) ................ 8

VI. SOLUTION SELECTION (TPH1 & TP1) ................. 9

A. Why Solution Selection is Available ........... 9

B. The 3 Solution Types....................... 9

C. Calibration of Each Solution Type............. 9

D. Procedure to Select a Solution ............... 9

VII. CALIBRATION ................................... 10

A. Calibration Intervals ...................... 10

B. Rules for Calibration of the TechPro II . . . . . . . . 10

1. Calibration Steps .................. 10

2. Calibration Limits .................. 11

C. Calibration Procedures

1. Conductivity or TDS Calibration

(TPH1 & TP1) ................. 11

2. Reloading Factory Calibration ........ 12

3. pH Calibration (TPH1 & TH1) ......... 12

VIII. CALIBRATION INTERVALS ......................... 14

A. Suggested Intervals ...................... 14

B. Calibration Tracking Records ............... 15

C. Conductivity or TDS Practices (TPH1 & TP1)... 15

D. pH Practices (TPH1 & TH1) ................ 15

4

IX. MEMORY........................................ 15

A. Memory Storage ......................... 16

B. Memory Recall .......................... 16

C. Clearing a Record/Memory Clear ............ 16

X. TEMPERATURE FORMAT “Centigrade & Fahrenheit” ..... 17

XI. TEMPERATURE COMPENSATION (TC) DISABLE

(TPH1 & TP1) .............................. 17

XII. SALINITY UNITS (TPH1 & TP1) ...................... 18

XIII. TOTAL RETURN to FACTORY SETTINGS.............. 19

XIV. CARE and MAINTENANCE ......................... 19

A. Temperature Extremes .................... 20

B. Battery Replacement (LO BATT) ............ 20

C. pH Sensor Replacement (TPH1 & TH1) ....... 20

D. Cleaning Sensors ........................ 20

XV. TROUBLESHOOTING CHART ....................... 22

XVI. ACCESSORIES................................... 24

A. Conductivity/TDS Standard Solutions

(TPH1 & TP1) ....................... 24

B. pH Buffer Solutions (TPH1 & TH1) ........... 24

C. pH Sensor Storage Solution (TPH1 & TH1) .... 24

D. Soft Protective Case ...................... 25

E. Hard Protective Carry Cases ............... 25

F. Replacement pH Sensor (TPH1 & TH1) ....... 25

XVII. TEMPERATURE COMPENSATION (TPH1 & TP1) ....... 25

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

B. Tempco Variation......................... 25

C. An Example............................. 26

D. A Chart of Comparative Error ............... 26

E. Other Solutions .......................... 27

XVIII. CONDUCTIVITY CONVERSION to
TOTAL DISSOLVED SOLIDS (TDS) (TPH1 & TP1)... 28

A. How it’s Done ........................... 28

B. Solution Characteristics ................... 28

C. When does it make a lot of difference?........ 28

XIX. TEMPERATURE COMPENSATION (Tempco)

and TDS DERIVATION (TPH1 & TP1) ........... 29

XX. pH MEASUREMENT (TPH1 & TH1) ................... 29

A. pH as an Indicator (TPH1 & TH1) ............ 29

B. pH Units (TPH1 &TH1) .................... 30

C. pH Sensor (TPH1 &TH1) .................. 30

D. Myron L Integral pH Sensor (TPH1 &TH1) ..... 31

E. Sources of Error (TPH1 &TH1) .............. 31

XXI. SOFTWARE VERSION ............................. 32

XXII. GLOSSARY...................................... 33

XXIII. ADDENDUM ..................................... 34

XXIV. NOTES ......................................... 36

5

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 sensor well (TPH1 &TH1) 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 20 second auto “off” timer.

• Note the value displayed or press the MS key to store the
reading (ref. Memory Storage, pg. 16). It’s that simple!

B. Characteristics of the Keys

• Though your TechPro 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 20 seconds of inactivity the

instrument turns itself off (60 seconds in CAL mode).

• Rarely is it necessary to press and

to Select a Solution, pg. 9; or Cond. or TDS Calibration, pg. 11).

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

1. Measurement Keys in General
The measurement keys turn on the instrument in the mode selected.

The parameter 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. 11).

hold

a key (as in Procedure

2. COND and TDS Keys (TPH1 & TP1)
These 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 or 442), (ref.

Why Solution Selection is Available, pg. 9).
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.

6

b. 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. 9).

3. pH Key (TPH1 & TH1)

Measurements are made on the solution contained in the pH sensor
well (ref. pH Measurement, pg. 29). 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 sensor well must be relled with Myron L pH Sensor

Storage Solution, and the protective cap reinstalled securely (ref.
Maintenance of the pH Sensor, pg. 8 and pH, pg. 20).

A press of displays pH readings. No units are 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. 11).

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

“SEL” appears to allow Solution Selection (ref. pg. 9) with the Up or
Down keys. As in calibration, the CAL key becomes 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. 16).

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, these keys scroll the display up and down
through the stack of records (ref. Memory Recall, pg. 16).

7

IV. AFTER USING the TechPro II
A. Maintenance of the Conductivity Cell (TPH1& TP1)

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. Conductivity or

TDS, pg. 20). Even if a very active cbhemical discolors the electrodes,

this does not affect the accuracy; leave it alone.

B. Maintenance of the pH Sensor (TPH1 & TH1)
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, use an almost saturated KCl solution, pH 4 buffer

(ref. pH Buffer Solutions, pg. 24) or a saturated solution of table salt and
tap water. NEVER USE DISTILLED WATER (ref. pH, pg. 20).

V. SPECIFIC RECOMMENDED MEASURING PROCEDURES

Verify proper solution setting (KCl, NaCl, or 442), (ref. Solution Selection, pg. 9).

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. Note value displayed.

B. Measuring pH (TPH1 & TH1)

1. Remove protective cap by squeezing its at 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.

8

6. IMPORTANT: After use, ll pH sensor well with Myron L pH

Figure 1

KCl

442

NaCl

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, pg. 20).

Do not allow pH sensor to dry out.

VI. SOLUTION SELECTION (TPH1 & TP1)

A. Why Solution Selection is Available
Conductivity and TDS require temperature correction to 25°C values (ref.

Standardized to 25°C, pg. 25). Selection determines the temperature
correction of conductivity and calculation of TDS from compensated
conductivity (ref. Cond. Conversion to TDS, pg. 28).

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, 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. 28). NaCl may be user selected for either.

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. 11) is performed separately for each type of solution one wishes to
measure (ref. Conductivity/TDS Standard Solutions, pg. 24).

D. Procedure to Select a Solution

NOTE: Check display to see if solution displayed (KCl, NaCl or 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. “SEL” will be
displayed (see Figure 1).
For demonstration purposes,
all 3 solution types are
shown simultaneously.

9

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

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

(ref. Solution Characteristics, pg. 28). The selected solution
type will be displayed: KCl, NaCl or 442.

4. Press to accept new solution type.

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. (ref. CALIBRATION INTERVALS, pg. 14).

B. Rules for Calibration of the TechPro II

1. Calibration Steps
a. Starting Calibration

Calibration is begun by pressing while measuring Conductivity,

TDS or pH. Measuring continues, but the CAL icon is on, indicating
calibration is now changeable.

The reading is changed with the and keys 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.

Once in “CAL” mode, the key 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).

10