Oakton Salt 6 User manual

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Instruction Manual
Salt 6
Hand-held Salinity Meter
68X243619
ver. 0 051102

Preface
This manual serves to explain the use of the Salt 6 salinity meter.
It 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 Salt 6
salinity meter as possible. If there are doubts in the use of this meter, 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. Version 0, 051102.

TABLE OF CONTENTS
1INTRODUCTION 1
2DISPLAY & KEYPAD FUNCTIONS 3
2.1 Display 3
2.2 Keypad 4
3PREPARATION 5
3.1 Inserting & Removing Rubber Boot 5
3.2 Inserting the Batteries 5
3.3 Battery Replacement 6
3.4 Conductivity Electrode Information 6
3.5 Connecting the Probe to Meter 8
3.6 Switching the Meter On 9
3.7 Change Salinity ÙTemperature Measurement Mode 10
4CALIBRATION 11
4.1 Important Information on Meter Calibration 11
4.2 Preparing the Meter for Calibration 12
4.3 Calibration for Salinity (% or ppt) 13
4.4 Temperature Calibration 14
5MEASUREMENT 15
5.1 With Automatic Temperature Compensation (ATC) 15
5.2 Without ATC (Manual Temperature Compensation) 16
5.3 Taking Measurements 17
5.4 HOLD Function 18
6ADVANCED SETUP FUNCTIONS 19
6.1 Advanced Setup Overview 19
6.2 Temperature Coefficient 21
6.3 Normalization Temperature 22
6.4 Selection of ppt or PrSn. (Default being PrSn) 23
6.5 Restore Factory Default Values 24
7PROBE CARE AND MAINTENANCE 25
8TROUBLE-SHOOTING GUIDE 26
9ERROR MESSAGES 27
10 SPECIFICATIONS 29
11 ACCESSORIES 30
12 ADDENDUM 1: CALIBRATION TIPS 31
13 WARRANTY 32
14 RETURN OF ITEMS 33

Instruction Manual Salt 6
1
1 INTRODUCTION
Thank you for purchasing the Salt 6 Salinity 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.
The Salt 6 meter measures the amount of Sodium Chloride (NaCl)
concentration either in Percentage (%) or Parts Per Thousand (ppt), and
Temperature (°C).
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.

Instruction Manual Salt 6
2
%
ON
OFF
HOLD
ENTER
CAL
MODE
Salt 6
Salinity Meter

Instruction Manual Salt 6
3
2 DISPLAY & KEYPAD FUNCTIONS
2.1 Display
The meter has a large custom LCD that consists of 4-digit segments and
operation annunciators for ppt or %, and °C (Temperature). Other annunciators
include “HO” (when the HOLD function is activated) and “LO” (low battery
condition).
ppt
HO LO %
1
2
3
4
56
C°
LCD and Customized Annunciators for Salt 6 salinity meter
1. Primary display 4. Percentage indicator for
Concentration and
Temperature Coefficient.
2. Parts Per Thousand (ppt) 5. Low battery indicator.
3. Temperature indicator 6. Hold (freezed) reading
indicator.

Instruction Manual Salt 6
4
2.2 Keypad
The Salt 6 salinity 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
•Powers on and shuts off the meter. Takes you directly into
measurement mode when meter is switched on.
CAL
•Enters into calibration mode for % (or ppt) and Temperature.
•To abort calibration or setup mode without confirming any set
value.
HOLD
ENTER
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
programmes.
MODE
•Selects measurement mode for salinity 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 normalization
temperature, temperature coefficient factor, and resetting the
meter to factory default.
1) Normalization Temperature
2) Temperature Coefficient Factor
3) Selection of ppt or % measurement mode (ppt or PrSn
4) User reset

Instruction Manual Salt 6
5
3 PREPARATION
3.1 Inserting & Removing Rubber Boot
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:
3) Push in the direction of arrow
and lift up the cover.
4) Note the polarity of battery
before inserting into position.
5) After replacement, place cover
back and press down until it
locks tight.

Instruction Manual Salt 6
6
3.3 Battery Replacement
A “LO” annunciator in the LCD alerts you when battery power is running low.
Replace with the same type as recommended by the manufacturer.
LO
%
"LO" Battery Condition
Caution: Power off the meter when changing battery.
3.4 Conductivity Electrode Information
The Salt 6 salinity hand-held meter is supplied with a
electrode with a BNC connector. This electrode (Order
Part Number: EC-CONSEN91B/ 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

Instruction Manual Salt 6
7
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 in tact
during measurement and calibration.
Always immerse the probe beyond upper
steel band.
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.

Instruction Manual Salt 6
8
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 in Figure 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

Instruction Manual Salt 6
9
3.6 Switching the Meter On
When switching the meter on, it will go through a series of displays, showing the
various setup parameters.
Measurement Mode
(when probe is held in air)
C°
%
pptmV
pH %
%
ppt
MINMAX
LOHOJKT
F
C° °
m
S
µ
ON
OFF
1) Press ON/OFF key to power up your meter.
2) The first screen shows [SAL 6] which is the meter’s name.
3) Second screen shows [C 1.0] which is the conductivity cell constant,
k. Cell constant value is fixed, k=1.0.
4) 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.
5) Fourth screen shows [t 2.1%] which is the Temperature Coefficient.
You can customize 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.
6) All LCD segments will light up for 2 seconds, and change into
measurement mode. When the probe is held in the air and not in
contact with liquid, the value displayed may be [Ur].
7) You are now ready for conductivity measurement.

Instruction Manual Salt 6
10
3.7 Change Salinity ÙTemperature Measurement Mode
To switch between Salinity measurement mode and Temperature measurement
mode, simply press the MODE key.
The customized annunciator helps indicate the measurement parameter you
are in.
Annunciator
ppt
MODE
C°

Instruction Manual Salt 6
11
4 CALIBRATION
4.1 Important Information on Meter Calibration
The Salt 6 meter has a special built-in algorithm to linearize for the
measurement of Sodium Chloride concentration. Therefore the specified
accuracies from a One-point calibration anywhere in the measurement range,
specified accuracies can be applied for the entire measurement range.
When you recalibrate your meter, the old calibration will be replaced by the new
calibration point. For example, if you previously calibrated your conductivity
meter at 2.5% and you recalibrate at 1.0, the meter will replace the old
calibration data (2.5%).
To completely recalibrate your meter, or when you use a replacement probe, it
is best to clear all calibration data. To erase all calibration data completely, see
Section 6.5 – Restore Factory Default Values.

Instruction Manual Salt 6
12
4.2 Preparing the Meter for Calibration
Before starting calibration, make sure you are in the correct measurement
mode.
Ensure that you use new Sodium Chloride standard solutions during calibration.
Do not reuse standard solutions as it may be contaminated and affect the
calibration and accuracy of measurements. Use fresh calibration solution each
time you calibrate your meter. Store solutions in a dry and cool environment if
possible.
Always rinse the probe with either deionized water or rinse solution before and
after each calibration/sample measurement to avoid cross-contamination. For
details please refer to Section 7 - Probe Care and Maintenance.
NOTE: These meters are factory set to a temperature
coefficient of 2.1% per °C.
The factory default value for normalization
temperature is 25 °C. If you need to normalize to a
value other than 25 °C, see Section 6.3 –
Normalization Temperature.

Instruction Manual Salt 6
13
4.3 Calibration for Salinity (% or ppt)
The following example shows calibration sequence to 2.5% calibration
standard.
Procedure is similar for both % and ppt measurement mode.
1) If necessary, press MODE key to select
temperature mode.
2) Rinse the probe thoroughly with de-ionized
water or a rinse solution, then rinse with a
small amount of calibration standard.
3) Dip the probe into the calibration standard.
Immerse the probe tip beyond the upper
steel band (see Section 3.4). Stir the probe
gently to create a homogeneous sample.
Allow time for the reading to stabilize.
4) Press CAL key to enter salinity calibration
mode. The [CA] indicator will appear for
1.5 seconds, and a value will appear
flashing.
NOTE: To exit calibration without confirmation,
press CAL key again to go back to
measurement mode.
5) Wait for the value to stabilize and press ▲
or ▼key and adjust the value to the
calibration standard used.
6) Press the ENTER key. The [CO] indicator
will appear for 1.5 seconds, and the
calibration is successfully performed. The
meter returns to measurement mode.
CAL
HOLD
ENTER
Measurement Mode
%
%
%
%

Instruction Manual Salt 6
14
4.4 Temperature Calibration
The Conductivity electrode (EC-CONSEN91B/ 35606-
55) has a built-in temperature sensor for ATC. The
temperature sensor is factory calibrated to the meter.
Calibrate your sensor only if you suspect temperature
errors that may have occurred over a long period of
time or if you have a replacement probe.
1) Make sure that the phono jack (for
temperature measurement) is properly
connected to the meter. See Section 3.5.
2) Switch on the meter and if necessary,
press MODE key to select temperature
measurement mode. See Section 3.7.
3) Press CAL key to start temperature
calibration process.
4) Dip the probe into a solution with known
temperature (for example, a temperature
bath). Allow time for the temperature to
stabilize.
5) Wait for the value to stabilize and press ▲
or ▼key and adjust the value to the
solution temperature.
6) Press the ENTER key. The [CO] indicator
will appear for 1.5 seconds, and the
reading will stop flashing. The temperature
calibration is successfully performed. The
meter returns to measurement mode.
NOTE: To exit calibration without confirmation, press CAL key again to go
back to measurement mode.
NOTE: You can offset the temperature reading up to ±5 °C from
the original (default) reading.
C°
C°
C°
HOLD
ENTER
°C
CAL

Instruction Manual Salt 6
15
5 MEASUREMENT
The Salt 6 meter is capable of taking measurements with automatic or manual
temperature compensation.
5.1 With Automatic Temperature Compensation (ATC)
For ATC, make sure the phono jack of the probe (see Section 3.5) is securely
inserted.
The % or ppt reading displayed will be compensated for according to the
normalization temperature (20 °C or 25 °C) selected. See Section 6.3 –
Normalization Temperature.

Instruction Manual Salt 6
16
5.2 Without ATC (Manual Temperature Compensation)
For manual temperature compensation, simply unplug the probe’s phono jack
(not BNC) from the meter.
To use manual temperature compensation, you need to enter the temperature
value of your process into the meter. This is the value at which the reading will
manually temperature compensates. You can select any temperature between
0 and 50 °C. Default value is 25 °C.
1) Make sure that the phono jack (for
temperature measurement) is disconnected
from the meter. See Section 3.5.
2) Switch on the meter and if necessary, press
MODE key to select temperature
measurement mode. See Section 3.7.
3) Press CAL key to start temperature
calibration process.
4) The “CA” will appear momentarily and a
temperature value will starting flashing.
5) Check the temperature of your sample
using an accurate thermometer. Wait for the
value to stabilize and press ▲or ▼key
and adjust the value to the reference
thermometer used.
6) Press the ENTER key. The [CO] indicator
will appear for 1.5 seconds, and the reading
will stop flashing. The temperature
calibration is successfully performed. The
meter returns to measurement mode.
C°
C°
C°
HOLD
ENTER
°C
CAL

Instruction Manual Salt 6
17
5.3 Taking Measurements
To take readings:
1) Rinse the probe with de-ionized or distilled water before use to
remove any impurities adhering to the probe body. Shake or air dry.
To avoid contamination or dilution of your sample, rinse probe with a
small volume of your sample liquid.
2) Press ON to switch on meter.
3) Dip the probe into the sample.
4) Allow time for the reading to stabilize. Note the reading on the
display.
NOTE: When dipping the probe into the sample, take care to
ensure that the liquid level is above its upper steel
band. Stir the probe gently in the sample to create a
homogenous sample. See Figure in Section 3.4.