EUTECH INSTRUMENTS COND 6 PLUS User manual

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Instruction Manual
Cond 6+ Conductivity/Temp
TDS 6+ TDS/Temp
Salt 6+ Salinity/Temp
68X243635
Rev 0 02/09
Part of Thermo Fisher Scientific

Preface
This manual serves to explain the use of the Conductivity, TDS, and Salinity handheld
meters. The models covered are the CON 6+, TDS 6+, and Salt 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,
TDS, and Salinity handheld meters as possible. If there are doubts in the use of these
meters, please do not hesitate to contact the nearest Eutech Instruments Authorized
Distributor.
Eutech 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.
Copyright © 2009
Eutech Instruments Pte Ltd
Rev. 0 02/09

Table of Contents
1. INTRODUCTION........................................................................1
2. GETTING STARTED..................................................................2
2.1 Description of Keypad Functions .................................................................2
2.2 Description of LCD Annunciators.................................................................3
2.3 Inserting & Removing the Rubber Armour / Stand.......................................4
2.4 Inserting New Batteries ...............................................................................4
2.5 Battery Replacement...................................................................................5
2.6 Electrode Information ..................................................................................5
2.7 Connecting the Electrode ............................................................................6
2.8 Switching the Meter On ...............................................................................7
2.9 Changing Mode...........................................................................................8
3. CALIBRATION...........................................................................9
3.1 Important Information on Meter Calibration .................................................9
3.2 Preparing the Meter for Calibration..............................................................10
3.3 Selection of Auto or Manual Calibration (COND 6+)....................................10
3.4 Using Automatic Calibration (COND 6+)......................................................11
3.5 Manual Calibration ......................................................................................13
3.6 Temperature Calibration..............................................................................14
4. MEASUREMENT .......................................................................15
4.1 With Automatic Temperature Compensation (ATC).....................................15
4.2 Without ATC (Manual Temperature Compensation)....................................15
4.3 Taking Measurements.................................................................................16
4.4 Using Manual Ranging Function (COND 6+, TDS 6+).................................16
4.5 HOLD Function............................................................................................18
5. ADVANCED SETUP FUNCTIONS ............................................18
5.1 Advanced Setup Overview ..........................................................................18
5.2 Select Cell Constant (COND 6+, TDS 6+ only)............................................20
5.3 Automatic Calibration (COND 6+ only) ........................................................20
5.4 Setting the TDS Factor (TDS 6+ only) .........................................................21
5.5 Temperature Coefficient ..............................................................................21
5.6 Normalization Temperature .........................................................................22
5.7 Single-Point Calibration (COND 6+, TDS 6+ only).......................................22
5.8 Restore Factory Default Values...................................................................23
6. PROBE CARE AND MAINTENANCE .......................................23
7. TROUBLESHOOTING...............................................................24
8. SPECIFICATIONS / FEATURES...............................................25
9. CONDUCTIVITY THEORY.........................................................27

10. CALIBRATION TIPS..................................................................29
11. CALCULATING TDS CONVERSION FACTOR ........................30
12. CALCULATING TEMPERATURE COEFFICIENTS..................31
13. REPLACEMENTS AND ACCESSORIES..................................32
14. WARRANTY ..............................................................................33
15. RETURN OF ITEMS ..................................................................33

Instruction Manual COND 6+, TDS 6+, SALT 6+
-1-
1. INTRODUCTION
Thank you for purchasing the COND 6+, TDS 6+, or SALT 6+ meter. These
microprocessor-based handheld meters are economical and easy to use. It has a large
custom LCD (Liquid Crystal Display) for clear and easy reading.
The Cond 6+ measures conductivity (µS/cm or mS/cm) and temperature (°C) while the
TDS 6+ measures total dissolved solids (TDS) in parts per million (ppm) or parts per
thousand (ppt) and temperature (°C). Each measures up to 5 different ranges and can
automatically switch to appropriate measuring range.
The Salt 6+ measures salinity (as NaCl) in % salt or ppt and temperature (°C).
Your meter includes an electrode (cell constant K = 1.0) with built-in temperature sensor
(ECCONSEN91B), rubber armour, 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.

Instruction Manual COND 6+, TDS 6+, SALT 6+
-2-
2. GETTING STARTED
2.1 Description of Keypad Functions
Your meter has 6 keys on its splash-proof keypad. Some
buttons have multiple functions depending on the mode of
operation.
ON/OFF Powers meter on and off. Meter starts up in the
measurement mode that you last switched off
from.
CAL Enters into calibration mode. Pressing while in
calibration mode will abort calibration without
confirming value.
MODE Selects desired measurement mode. When pressed simultaneously with
ON/OFF, it will take you into the SETUP mode. See ADVANCED SETUP
section for more information.
HOLD Freezes measured reading. Press again to resume live reading.
ENTER Confirms calibration value in calibration mode and confirm selections in
SETUP mode.
 Increment values during calibration mode or scroll through SETUP.
Activates manual ranging function during conductivity / TDS measurement.
Decrement values during calibration mode.

Instruction Manual COND 6+, TDS 6+, SALT 6+
-3-
2.2 Description of LCD Annunciators
Your meter has a large custom LCD that consists of 4-digit segments plus annunciators
for uS/mS (Cond 6+), ppm/ppt (TDS 6+), or ppt/% (Salt 6+) and °C (temperature).
pptm
HO LO %
m
S
µ
1
2
3
4
5
67
C°
1. Primary display
2. Parts per million (ppm) (TDS 6+ only).
Parts per thousand (ppt) (TDS 6+ & Salt 6+ only).
3. Milli-Siemens/cm (mS) or micro-Siemens/cm (µS) indicator (Cond 6+ only).
4. Temperature indicator.
5. Percentage indicator for temperature coefficient or % Salinity (Salt 6+ only).
6. “LO” = low battery condition.
7. “HO” = HOLD function is activated and reading is frozen.

Instruction Manual COND 6+, TDS 6+, SALT 6+
-4-
2.3 Inserting & Removing the Rubber Armour / Stand
1. To remove meter from rubber armour, push out from the bottom edges of meter until
it is completely out of boot. Ensure that your electrode cables are not connected.
Figure A.
2. To insert meter into armour, 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. Figure B.
2.4 Inserting New Batteries
The battery compartment is found at the back of instrument. To open the battery
compartment, push in the direction of arrow and lift up the cover. Note the polarity of
battery before inserting into position. After replacement, place cover back and press
down until it locks.
Fi
g
ure
A
Fi
g
ure B

Instruction Manual COND 6+, TDS 6+, SALT 6+
-5-
2.5 Battery Replacement
A “LO” annunciator in the LCD alerts you when battery power is running low. See below.
LO
S
µ
"LO" Battery Condition
Caution: Power off the meter when changing battery.
2.6 Electrode Information
Your meter includes an electrode with a BNC connector (EC-
CONSEN91B) having a nominal cell constant of k = 1.0, and a built-in
temperature sensor. The Ultem-body housing has good chemical
resistant properties. The electrode design offers fast temperature
response and reduces air entrapment, ensuring accurate, repeatable,
and stable readings.
The wettable materials of the probe include:
1. Polyetherimide (Ultem) – protective probe guard
2. Polybutylterphalate (Valox) – sensor housing
3. Stainless Steel (SS 304) – 2 steel bands
The protective probe guard can be removed temporarily for
maintenance but must be re-attached during measurement and
calibration. Erroneous results will occur while the probe guard is
removed.
Always immerse the probe beyond upper steel band for best results.
Use the fill line on the outside of the probe guard for reference.

Instruction Manual COND 6+, TDS 6+, SALT 6+
-6-
1. DO NOT measure or calibrate without the protective
probe guard in place.
2. Immersion above the protective guard is not
recommended. The cable can be submerged briefly
but is not designed for continuous immersion.
See “Probe Care and Maintenance” for more information.
2.7 Connecting the Electrode
1. To connect electrode, align the connector slots with
the posts of meter’s socket and rotate connector
clockwise until it locks.
2. To remove, 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.
BNC connector 2.5 mm mini phono
for temperature

Instruction Manual COND 6+, TDS 6+, SALT 6+
-7-
2.8 Switching the Meter On
Press ON/OFF to power up your meter. Your meter will cycle through various setup
parameters when switched on.
1. The first screen shows the model [Con6] [tdS6] [SAL6].
2. The second screen shows the nominal cell constant value. The Cond 6+ and TDS
6+ meters can accept electrodes with k = 0.1, 1.0 or 10.0 nominal cell constants.
The Salt 6+ can be used with 1.0 only. Default value is k = 1.0 [C 1.0].
See Section 5.2 Advanced Setup to modify.
3. The third screen shows the Normalization Temperature which can be set to 25 °C
or 20 °C. Default value is 25 °C [t 25.0 °C].
See Section 5.6 Advanced Setup to modify.
4. The fourth screen shows the Temperature Coefficient which can be set from 0.0
to 3.0 % per °C. Default value is 2.1 %/°C [t 2.1%].
See Section 5.5 Advanced Setup to modify.
5. All LCD segments light for 2 seconds before entering measurement mode. Note:
the meter will use the measurement mode that was in use when it was previously
powered off.
Cond 6+
Measurement Mode
m
S
µ
C°
%
pptmV
pH %MINMAXLOHO
F
C° °
m
S
µ S
µ
ON
OFF

Instruction Manual COND 6+, TDS 6+, SALT 6+
-8-
Measurement Mode
C°
%
ON
OFF
ppm
pptmV
pH %MINMAXLOHO
F
C° °
m
S
µ
pptm
TDS 6+
Salt 6+
Measurement Mode
(when probe is held in air)
C°
%
pptmV
pH %
%
ppt
MINMAX
LOHOJKT
F
C° °
m
S
µ
ON
OFF
2.9 Changing Mode
To switch between conductivity/TDS/salinity measurement mode and temperature
measurement mode, simply press the MODE key.
The annunciator will indicate the measurement mode you are in.
Annunciator
MODE
S
µ
C°

Instruction Manual COND 6+, TDS 6+, SALT 6+
-9-
3. CALIBRATION
3.1 Important Information on Meter Calibration
The COND 6+ and TDS 6+ have five measuring ranges listed below. Each range can be
calibrated to one point per range (five total points if each range is calibrated). Calibration
is recommended for each range that will be utilized.
The Salt 6+ meter uses a special algorithm for the measurement of sodium chloride
concentration. A one-point calibration anywhere in the measurement range is all that is
needed to achieve specified accuracies for the entire measurement range.
COND 6+ Conductivity Range Recommended Calibration
Solution Range
0.00 Æ20.00 µS/cm 6.00 to 17.00 µS/cm
0.0 Æ200.0 µS/cm 60.0 to 170.0 µS/cm
0 Æ2000 µS/cm 600 to 1700 µS/cm
0.00 Æ20.00 mS/cm 6.00 to 17.00 mS/cm
0.0 Æ200.0 mS/cm 60.0 to 170.0 mS/cm
TDS 6+ TDS Range Recommended Calibration
Solution Range
0.00 Æ10.00 ppm 3.00 to 8.50 ppm
10.0 Æ100.0 ppm 30.0 to 85.0 ppm
100 Æ1000 ppm 300 to 850 ppm
1.00 Æ10.00 ppt 3.00 to 8.50 ppt
10.0 Æ200 ppt 30.0 to 170 ppt
SALT 6+ Salinity Range Recommended Calibration
Solution Range
0.10 Æ5.00 % 0.10 Æ5.00 %
1.0 Æ50.0 ppt 1.0 Æ50.0 ppt
New calibrations replace old calibrations on a per range basis. For example, if the meter
has been calibrated with 1413 µS/cm (0 to 2000 µS/cm range) and a calibration is
performed with 1500 µS/cm (also 0 to 2000 µS/cm range), the meter will replace the
1413 µS/cm calibration in that range. The meter will retain all calibration data in other
ranges.
When the electrode is replaced, it is best to clear all calibration data. To erase all
calibration data completely, see Section 5.8 Restore Factory Default Values.

Instruction Manual COND 6+, TDS 6+, SALT 6+
-10-
3.2 Preparing the Meter for Calibration
For best results, select a standard value close to the sample value you are measuring.
Alternatively, use a calibration solution value that is approximately 2/3 the full-scale
value of the measurement range you plan to use. For example, in the 0 to 2000 µS/cm
conductivity range, use a 1413 µS/cm solution for calibration.
Use fresh calibration standard solutions. Reuse of standard solutions may impair
calibration and accuracy of measurements. Store solutions in a dry, dark, and cool
environment when possible while limiting exposure to air.
Rinse or immerse the probe before calibration and between samples with clean water
(deionized water is ideal).
3.3 Selection of Auto or Manual Calibration (COND 6+)
The COND 6+ is capable of automatic or manual calibration. The factory default setting
is automatic.
In the automatic calibration mode, the COND 6+ will automatically select one of (4)
calibration standard values (see below) depending on the range and normalization
temperature being used.
Automatic calibration is useful when all your calibration standards fall into one of the
groups listed below. For example, if your 1413 µS/cm standard reads as 1400 µS/cm
during calibration, you would simply press “ENTER” to accept this value using automatic
mode. In manual mode, you would have needed to press the increment button 13 times
before pressing “ENTER”. If you will use a calibration standard that is not listed below,
select manual calibration instead.
Normalization
Temperature Calibration Standards (Range)
25 °C
1. 84 µS/cm (for 0 – 200 µS/cm)
2. 1413 µS/cm (for 0 – 2000 µS/cm)
3. 12.88 mS/cm (for 0.00 – 20.00 mS/cm)
4. 111.8 mS/cm (for 0.0 – 200.0 mS/cm)
20 °C
1. 76 µS/cm (for 0 – 200 µS/cm)
2. 1278 µS/cm (for 0 – 2000 µS/cm)
3. 11.67 mS/cm (for 0.00 – 20.00 mS/cm)
4. 102.1 mS/cm (for 0.0 – 200.0 mS/cm)
Table 1: Conductivity Calibration Standards for Auto Calibrations

Instruction Manual COND 6+, TDS 6+, SALT 6+
-11-
With manual calibration, you are not limited to the calibration standard values listed
previously. Manual calibration is useful when you wish to use one or more standard
values that are not listed above.
See Section 5.3 Advanced Setup to modify automatic or manual calibration.
3.4 Using Automatic Calibration (COND 6+)
In Automatic Calibration mode, the COND 6+ can accept up to 4 calibration points with
maximum of 1 point per measurement range. Note: values in the 0.00 to 20.00 µS/cm
range cannot be calibrated in Auto Calibration mode.
1. If necessary, press MODE key to select conductivity
mode.
2. Rinse the probe with deionized water or a rinse
solution, then rinse with a small amount of calibration
standard.
NOTE: For Automatic Calibration you must use one of
the calibration standards listed in Table 1.
3. Dip the probe into the calibration standard. Stir the
probe gently to create a homogeneous sample. Allow
time for the reading to stabilize.
4. Press CAL key to enter conductivity calibration mode.
The [CA] indicator will appear briefly, then a value will
appear flashing.
NOTE: To exit calibration without confirmation, press
CAL to return to measurement mode.
5. When the value is stable, press ENTER. The
calibration standard value will appear for 3 seconds.
If the calibration is successfully performed, [donE] will
be displayed briefly before meter returns to
measurement mode.
6. Repeat steps 1-5 as needed with additional calibration
standards.
mS
mS
mS
mS
CAL
HOLD
ENTER
Measurement Mode

Instruction Manual COND 6+, TDS 6+, SALT 6+
-12-
NOTES:
1. To protect from erroneous calibrations, the allowable
tolerance is ±40% of the factory default value. If calibration is
attempted with standards that fall outside this tolerance
range, the error message “Err 1” is indicated and meter will
return to measurement mode. For example, a 40% tolerance
of a 1413 µS/cm standard, is 848 µS/cm to 1978 µS/cm.
2. If the measured temperature (°C) of the calibration solution is
below 0 °C or above 50 °C, the error message “Err 2” is
indicated and meter will return to measurement mode.
3. Low conductivity standard solutions (less than 20 µS/cm) are
unstable and are very temperature dependent. As a result,
reproducible calibration results are challenging in lowest
measurement range (0.00 to 20.0 µS/cm).

Instruction Manual COND 6+, TDS 6+, SALT 6+
-13-
3.5 Manual Calibration
In Manual Calibration mode you are not limited to the conductivity calibration standards
listed previously in Table 1. This example shows a manual calibration sequence using a
12.00 mS/cm conductivity calibration standard.
1. If necessary, press MODE key to select conductivity
mode.
1. Rinse the probe thoroughly with de-ionized water or
a rinse solution, then rinse with a small amount of
calibration standard.
1. Dip the probe into the calibration standard. Stir the
probe gently to create a homogeneous sample.
Allow time for the reading to stabilize.
1. Press CAL to enter conductivity calibration mode.
The [CA] indicator will appear briefly, then a value
will appear flashing.
NOTE: To exit calibration without confirmation, press
CAL to return to measurement mode.
2. When the value is stable, press ▲or ▼as needed
to adjust the value to match your calibration
standard.
3. Press ENTER to confirm the adjusted value. [CO]
will appear briefly indicating that the calibration was
successful. The meter returns to measurement
mode.
4. Repeat steps 1-6 as needed with additional
calibration standards.
mS
mS
mS
mS
CAL
HOLD
ENTER
Measurement Mode

Instruction Manual COND 6+, TDS 6+, SALT 6+
-14-
3.6 Temperature Calibration
The electrode includes a built-in temperature sensor that
is factory calibrated with the meter. Perform temperature
calibration only if you suspect temperature errors may
have occurred over time or when the probe is replaced.
You can offset the temperature reading up to ±5 °C from
the original (default) reading.
1. Connect the mini phono plug of the electrode to the
meter. See Section 3.7.
2. If necessary, press MODE to select temperature
measurement mode.
3. Press CAL to initiate temperature calibration. “CA”
will appear briefly then a temperature value will start
flashing.
4. Dip the probe into a solution with known
temperature (for example, a temperature bath).
Allow time for the temperature to stabilize.
5. When the value is stable, press ▲or ▼as needed
to adjust the value to the solution temperature.
6. Press ENTER to confirm the adjusted value. [CO]
will appear briefly indicating that the calibration was
successful. The meter returns to measurement
mode.
NOTE: To exit calibration without confirmation, press
CAL to return to measurement mode.
C°
C°
C°
HOLD
ENTER
°C
CAL

Instruction Manual COND 6+, TDS 6+, SALT 6+
-15-
4. MEASUREMENT
Your meter is capable of taking measurements that incorporate temperature
measurements automatically (most common) or using a temperature which you input
manually (rare).
4.1 With Automatic Temperature Compensation (ATC)
To compensate your reading using temperature values as measured by your electrode,
simply attach the phono plug of the electrode to the meter. The measured reading is
automatically compensated to the specified normalization temperature (either 20 °C or
25 °C). The rate of compensation which is applied is the Temperature Coefficient.
See Section 5.5 – Temperature Coefficient.
See Section 5.6 – Normalization Temperature.
4.2 Without ATC (Manual Temperature Compensation)
You can use manual temperature compensation after manually entering the
temperature value of your process into the meter. The meter will then compensate from
this fixed value to the normalization temperature. Any temperature can be used between
0 and 50 °C. The default value is 25 °C.
To activate manual temperature compensation, simply unplug the temperature sensor
from the meter (mini phono plug) and follow the steps 2 thru 6 of Temperature
Calibration.
See Section 3.6 – Temperature Calibration.