Eutech Instruments CON 6, TDS 6 User Manual

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Instruction Manual

CON 6/TDS 6

Hand-held Conductivity/TDS Meter

Technolo

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68X243618

Rev.2 01/04

Preface

This manual serves to explain the use of the Conductivity and TDS handheld
meters. The models covered are the CON 6 and TDS 6.

This manual functions in two ways: first as a step by step guide to help you
operate the meter; second, it serves as a handy reference guide.

This manual is written to cover as many anticipated applications of the
Conductivity and TDS handheld meters as possible. If there are doubts in the
use of the Conductivity and TDS handheld meters, please do not hesitate to
contact the nearest Eutech Instruments/ Oakton Instruments Authorized
Distributor.

Eutech Instruments/ Oakton Instruments will not accept any responsibility for
damage or malfunction to the meter caused by improper use of the instrument.

The information presented in this manual is subjected to change without notice
as improvements are made, and does not represent a commitment on the part
of Eutech Instruments Pte Ltd/ Oakton Instruments.

Copyright © 2002

Eutech Instruments Pte Ltd/ Oakton Instruments

All rights reserved. Rev. 2 01/04

TABLE OF CONTENTS

1 INTRODUCTION 1
2 DISPLAY & KEYPAD FUNCTIONS 3

2.1 Display 3

2.2 Keypad 4

3 PREPARATION 5

3.1 Inserting & Removing Rubber Boot 5

3.2 Inserting the Batteries 5

3.3 Battery Replacement 6

3.4 Conductivity Electrode Information 7

3.5 Connecting the Probe to Meter 9

3.6 Switching the Meter On 10

3.7 Change Conductivity/ TDS ÙTemperature Measurement Mode 12

4 CALIBRATION 13

4.1 Important Information on Meter Calibration 13

4.2 Preparing the Meter for Calibration 14

4.3 Selection of Automatic or Manual Calibration 15

4.4 Automatic Calibration (Conductivity) 16

4.5 Manual Calibration (Conductivity or TDS) 18

4.6 Temperature Calibration 19

5 MEASUREMENT 20

5.1 With Automatic Temperature Compensation (ATC) 20

5.2 Without ATC (Manual Temperature Compensation) 21

5.3 Taking Measurements 22

5.4 Using Manual Ranging Function 22

5.5 HOLD Function 24

6 ADVANCED SETUP FUNCTIONS 25

6.1 Advanced Setup Overview 25

6.2 Select Cell Constant 29

6.3 Automatic Calibration (for CON 6) 30

6.4 Setting the TDS Factor (for TDS 6) 30

6.5 Temperature Coefficient 31

6.6 Normalization Temperature 32

6.7 Single-Point Calibration 32

6.8 Restore Factory Default Values 33

7 PROBE CARE AND MAINTENANCE 34
8 TROUBLE-SHOOTING GUIDE 35
9 ERROR MESSAGES 36
10 SPECIFICATIONS 37
11 ACCESSORIES 39
12 CONDUCTIVITY THEORY 41
13 ADDENDUM 1: CALIBRATION TIPS 45

14 ADDENDUM 2: CALCULATING tDS CONVERSION FACTOR 46
15 Addendum 3: calculating temperature coefficients 47
16 WARRANTY 49
17 RETURN OF ITEMS 50

Instruction Manual CON 6/TDS 6

1 INTRODUCTION

Thank you for purchasing CON 6/TDS 6 Conductivity/TDS meter. These
economy microprocessor-based handheld meters deliver up to ±0.5% full-scale
accuracy. It has a large custom LCD (Liquid Crystal Display) for clear and easy
reading.

CON 6 measures Conductivity (µS/mS) and Temperature (°C) while the TDS 6
measures Total Dissolved Solids (TDS) and Temperature (°C). This sturdy
meter measures up to 5 different ranges with auto-ranging capability that
switches to appropriate measuring range automatically.

Your meter includes a conductivity electrode (cell constant K = 1.0) with built-in
temperature sensor (Order Code: EC-CONSEN91B/ 35606-55), a rubber boot,
4 alkaline “AAA” batteries, instruction manual and warranty card.

Please read this manual thoroughly before operating your meter.

To order other accessories and buffer standard solutions, please refer to the
Accessories Section for more information.

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Instruction Manual CON 6/TDS 6

CON

6

mS

MODE

°

C

ON

OFF

HOLD
ENTER

Conductivity/ Meter

CAL

2

Instruction Manual CON 6/TDS 6

2 DISPLAY & KEYPAD FUNCTIONS

2.1 Display

The meter has a large custom LCD that consists of 4-digit segments and
operation annunciators for uS/mS (or ppm/ppt for TDS 6 meter) and °C
(Temperature). Other annunciators include “HO” (when the HOLD function is
activated) and “LO” (low battery condition). See Figure below.

67

HO LO

1

LCD and Customized Annunciators for CON 6/TDS 6 meter

1. Primary display 4. Temperature indicator

2. Parts Per Million (ppm) or Parts
Per Thousand (ppt) indicator ­available for TDS 6 meter only.

3. milli-Siemens/cm (mS) or micro­Siemens/cm (µS) indicator ­available for CON 6 meter only.

7. Hold (freezed) reading indicator.

5. Percentage indicator for

6. Low battery indicator.

3

5

%

C°

m

S

µ

pptm

Temperature Coefficient.

4
3

2

Instruction Manual CON 6/TDS 6

2.2 Keypad

The CON 6 / TDS 6 meter has 6 keys on its splash-proof keypad; ON/OFF,
HOLD/ENTER, CAL, MODE, ▲ and ▼ keys. Some buttons have several
functions depending on its mode of operation.

ON

OFF

CAL

HOLD

ENTER

MODE

• Powers on and shuts off the meter. Takes you directly into
measurement mode when meter is switched on.

• Enters into calibration mode for Conductivity/TDS and
Temperature.

• To abort calibration or setup mode without confirming any set
value.

HOLD: Freezes the measured reading. To activate, press HOLD

key while in measurement mode. To release, press HOLD
key again.

ENTER: Press to confirm values in calibration mode, and to confirm

selections in SETUP mode.

• In Calibration Mode: Press to scroll through calibration values.

• In Setup Mode: Press to scroll through the setup sub-group

programs.

• Press ▲ key during conductivity measurement mode to
activate manual ranging function. Each key press will move up
higher conductivity range.

• Selects measurement mode for conductivity/TDS and
Temperature.

• When pressed together with ON/OFF key, it will take you into
the SETUP mode. This allows you to customize meter
preferences such as selecting electrode’s cell constant,
normalization temperature, temperature coefficient factor, TDS
factor (for TDS 6), automatic (only CON 6) or manual
calibration, single-point or multi-point calibrations, and to reset
meter to factory default.

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Instruction Manual CON 6/TDS 6

3 PREPARATION

3.1 Inserting & Removing Rubber Boot

(Rubber Boot sold separately)

1) To remove meter from rubber boot, push
out from the bottom edges of meter until it is
completely out of boot. Ensure that the
cables of Conductivity electrode or
temperature probe are not connected.

2) To insert meter into rubber boot, slide in
from the top of meter before pushing the
bottom edges of meter down to set it into
position. Lift up the stand at the back of
meter for bench top applications if
necessary.

3.2 Inserting the Batteries

The battery compartment is found at the
back of instrument as shown. To open the
battery compartment:

1) Push in the direction of arrow and lift
up the cover.

2) Note the polarity of battery before
inserting into position.

3) After replacement, place cover back
and press down until it locks tight.

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Instruction Manual CON 6/TDS 6

3.3 Battery Replacement

A “LO” annunciator in the LCD alerts you when battery power is running low.
See Figure below. Replace with the same type as recommended by the
manufacturer.

Caution: Power off the meter when changing battery.

LO

"LO" Battery Condition

S

µ

6

Instruction Manual CON 6/TDS 6

3.4 Conductivity Electrode Information

The CON 6/TDS 6 hand-held meter is supplied with a
conductivity/TDS electrode with a BNC connector. This
conductivity/TDS electrode (Order Part Number: EC­CONSEN91B/ 35606-55) comes with Stainless Steel rings,
cell constant of K = 1.0, and a built-in temperature sensor for
Automatic Temperature Compensation (ATC). Its specially
designed Ultem-body housing has good chemical resistant
properties. It provides fast temperature response and
reduces air entrapment, which makes it easy to obtain
accurate, stable readings.

The probe materials used which have good chemical
durability include:

1. Polyetherimide (Ultem) – protective probe guard

2. Polybutylterphalate (Valox) – sensor housing

3. Stainless Steel (SS 304) – 2 steel bands

Proper use of probe is essential to ensure that the optimum
measurement is taken in a short time.

The removable protective plastic probe guard is meant for
simple periodic maintenance and it must be kept intact
during measurement and calibration.

Always immerse the probe beyond upper steel band.

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Instruction Manual CON 6/TDS 6

NOTE:

1) DO NOT remove the protective probe guard during measurement and
calibration as it may affect your readings.

2) We recommend that you do not submerge the probe above the protective
guard. You can submerge the cable for brief periods of time, but not
continuously.

See Section 7 – “Probe Care and Maintenance” for more information.

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Instruction Manual CON 6/TDS 6

3.5 Connecting the Probe to Meter

1) To connect electrode into meter, align the connector slots with the posts
of meter’s socket and rotate connector clockwise until it locks.

2) To remove, simply rotate the connector in anti-clockwise direction until it
unlocks, and slide the connector off the socket.

3) Insert the mini phono jack of temperature sensor into the socket on the
meter as shown below.

4) Unplug the phono jack when not in use or when you want to measure
Conductivity or TDS without any temperature compensation (Manual
Temperature Compensation, see Section 5.2).

CAUTION: Do not pull or force on the probe cord or the probe

wires might disconnect.

NOTE: Keep connectors clean. Do not touch connector with

soiled hands.

BNC connector for
conductivity probe

Phono jack for
Temperature probe

Connection for Conductivity & Temperature Probes

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Instruction Manual CON 6/TDS 6

3.6 Switching the Meter On

When switching the meter on, it will go through a series of display, showing the
various setup parameters.

For CON 6

ON

OFF

For tdS 6

ON

OFF

Measurement Mode

Measurement Mode

m

S

µ

S

µ

pptm

pH %MINMAXLOHO

m

µ

pptmV

ppm

C°

pH %MINMAXLOHO

m

µ

pptmV

FC°°

S

%

C°

FC°°

S

%

10

Instruction Manual CON 6/TDS 6

Press ON/OFF key to power up your meter.

1) The first screen shows [Con 6] (or [tdS 6]) which is the meter’s name.

2) Second screen shows [C 1.0] which is the conductivity cell constant, k.
You can select different cell constant of 0.1, 1.0 or 10.0. Refer to Section
on Advance Setup. Default value is k=1.0.

3) Third screen shows [t 25.0 °C] which is the Normalization Temperature.
You can set Normalization Temperature at either 25 °C or 20 °C. Refer to
Section on Advance Setup. Default value is 25 °C.

4) Fourth screen shows [t 2.1%] which is the Temperature Coefficient. You
can customise the meter with different Temperature Coefficient value
from 0.0 to 3.0 %/°C from the Advance Setup mode. Default value is 2.1
%/°C.

5) All LCD segments will light up for 2 seconds, and change into
measurement mode.

6) You are now ready for conductivity measurement.

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Instruction Manual CON 6/TDS 6

3.7 Change Conductivity/ TDS ÙTemperature

Measurement Mode

To switch between Conductivity/ TDS measurement mode and Temperature
measurement mode, simply press the MODE key.

The customized annunciator helps indicate the measurement parameter you
are in.

Annunciator

S

µ

MODE

C°

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Instruction Manual CON 6/TDS 6

4 CALIBRATION

4.1 Important Information on Meter Calibration

Your meter has five measuring ranges. You can calibrate one point in each of
the measuring ranges (up to five points). If you are measuring values in more
than one range, make sure to calibrate each of the ranges you are measuring.

The following table lists the corresponding conductivity and TDS ranges. You
should calibrate each range using a solution that falls between the values in the
“recommended calibration solution range” column

Conductivity Range Recommended

Calibration

Solution Range

0.00 Æ 20.00 µS 6.00 to 17.00 µS 0.00 Æ 10.00 ppm 3.00 to 8.50 ppm

0.0 Æ 200.0 µS 60.0 to 170.0 µS 10.0 Æ 100.0 ppm 30.0 to 85.0 ppm

0 Æ 2000 µS 600 to 1700 µS 100 Æ 1000 ppm 300 to 850 ppn

0.00 Æ 20.00 mS 6.00 to 17.00
mS

0.0 Æ 200.0 mS 60.0 to 170.0
mS

TDS Range Recommended

Calibration

Solution Range

1.00 Æ 10.00 ppt 3.00 to 8.50 ppt

10.0 Æ 200 ppt 30.0 to 170 ppt

When you recalibrate your meter, old calibrations are replaced on a range
basis. For example, if you previously calibrated your conductivity meter at 1413
µS in the 0 to 2000 µS range and you recalibrate at 1500 µS (also in the 0 to
2000 µS range), the meter will replace the old calibration data (1413 µS) in that
range. The meter will retain all calibration data in other ranges.

To completely recalibrate your meter, or when you use a replacement probe, it
is best to clear all calibration data. To erase all the old conductivity or TDS

calibration data completely, see Section 6.8 – Restore Factory Default Values.

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