7. parts per thousand indicator
(CON 410 meter only)
AM PM
12
131415
Figure 1: Full LCD Screen
410 meter only)
Compensation indicator
14. Low battery indicator
Secondary Display
ATC
1011
15. Probe indicator
17. Cell constant indicator
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Instruction Manual CON 400/410
2.2 Keypad
The large membrane keypad makes the instrument easy to use. Each button, when pressed,
has a corresponding graphic indicator on the LCD. See Figure 2. Some buttons have several
functions depending on its mode of operation.
Key Function
ON/OFF Powers on and shuts off the meter. When you switch on the meter, the meter starts up
HOLD Freezes the measured reading. To activate, press HOLD while in measurement mode.
MODE Selects the measurement parameter.
CAL/MEAS Toggles between Calibration and Measurement mode.
ENTER /
RANGE
MI/S and
MR/T
SETUP Takes you into the SETUP mode. This mode lets you customise meter preference and
in the mode that you last switched off from. For example, if you shut the meter off in
TDS measurement mode (only in CON 410 meter), the meter will be in TDS
measurement mode when you switch the meter on.
To release, press HOLD again.
~ CON 400 meter: Toggles between conductivity and time.
~ CON 410 meter: Toggles between conductivity, TDS and time.
NOTE: Temperature calibration is available from conductivity calibration mode; see
page 9 for directions.
ENTER function: Press to confirm values in Calibration mode and to confirm selections
in SETUP mode.
RANGE function: Press to enter manual ranging function.
The MEAS indicator blinks while in manual ranging function.
In Measurement mode:
Press MI/S (memory input) to store values with its corresponding temperature values in
the memory. Press MR/T (memory recall) to retrieve data from memory.
In Calibration mode:
Press to scroll through calibration values.
In SETUP mode:
Press to scroll through the setup subgroup programmes.
defaults, and view calibration, electrode offset data and select cell constant.
Figure 2 - Keypad
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Instruction Manual CON 400/410
3 PREPARATION
3.1 Inserting the Batteries
Four AAA batteries are included with your meter.
1. Use a Philips screwdriver to remove the two screws holding the battery cover. See Figure
3 below.
2. Remove battery cover to expose batteries.
3. Insert batteries. Follow the diagram inside the cover for correct polarity.
4. Replace the battery cover into its original position using the two screws removed earlier.
Figure 3 - Back panel of meter showing meter compartment
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Instruction Manual CON 400/410
3.2 Conductivity Electrode Information
The CON400/410 meter uses a conductivity / TDS cell with a
sturdy 6-pin connector.
Your meter includes a conductivity probe (Part No: EC-
CONSEN91W / 35608-50) Ultem / Stainless Steel cells with a cell
constant of K = 1.0. This conductivity / TDS cell features a built-in
temperature sensor for Automatic Temperature Compensation
(ATC). It has a specially designed housing that provides fast
temperature response and reduces air bubble entrapment, which
makes it easy to obtain accurate, stable readings.
Wetted parts include:
1. Polyetherimide (Ultem™)
2. Polybutylterphalate (Valox™)
3. Stainless Steel (SS 304)
NOTE: We recommend that you do not submerge the probe above
the protective yellow cap for prolonged periods. The protective
yellow cap can be removed for cleaning, but must be attached at
all times during calibration or measurement.
See Section 8 on page 40 for “Probe Care and Maintenance”
information.
1
Figure 4 - Conductivity probe
(EC-CONSEN91W/ 35608-50)
1
Valox and Ultem are trademark names of General Electric Co.
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Instruction Manual CON 400/410
3.3 Connecting the probe to the meter
1. Line up the notch and 6 pins on the meter with the holes in the 6-pin connector. Push
down and turn the locking ring clockwise to lock into place. See figure below.
2. To remove probe, turn the locking ring counterclockwise on the probe connector. Pull
probe away from the meter.
CAUTION: Do not pull on the probe cord or the probe wires might disconnect.
NOTE: Keep connectors clean. Do not touch connector with soiled hands.
Figure 5 - Connection for Conductivity probe (6-pin connector)
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Instruction Manual CON 400/410
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.
To view current calibration points, see SETUP section Program 2.0 on page 28.
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
Measuring
Range
0.00 Æ 19.99 μS 6.00 to 17.00 μS 0.00 Æ 9.99 ppm 3.00 to 8.50 ppm
0.0 Æ 199.9 μS 60.0 to 170.0 μS 10.0 Æ 99.9 ppm 30.0 to 85.0 ppm
0 Æ 1999 μS 600 to 1700 μS 100 Æ 999 ppm 300 to 850 ppm
0.00 Æ 19.99 mS 6.00 to 17.00 mS 1.00 Æ 9.99 ppt 3.00 to 8.50 ppt
0.0 Æ 199.9 mS 60.0 to 170.0 mS 10.0 Æ 200 ppt 30.0 to 170 ppt
When you recalibrate your meter, old calibrations are replaced on a range by range basis. For
example, if you previously calibrated your conductivity meter at 1413 μS in the 0 to 1999 μS
range and you recalibrate at 1500 μS (also in the 0 to 1999 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 in memory. To erase all the old conductivity and TDS calibration data
completely from memory, see SETUP section Program 8.0 on page 39.
For information on how to calibrate your meter:
• See section 4.3 for Temperature Calibration.
• See section 4.4 for Conductivity
• See section 4.5 for TDS Calibration (CON 410 meter only).
• See Addendum 1 for more calibration tips.
Recommended
Calibration Solution
Range
TDS Measuring
Range
Recommended
Calibration Solution
Range
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Instruction Manual CON 400/410
4.2 Preparing the Meter for Calibration
Before starting calibration, make sure you are in the correct measurement mode. When you
switch on the meter, the meter begins with the units you shut it off in.
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 1999 μS conductivity range,
use a 1413 μS solution for calibration.
Do not reuse calibration solutions after calibration. Contaminants in the solution can affect the
calibration, and eventually the accuracy of the measurements. Use fresh calibration solution
each time you calibrate your meter.
NOTE: Your meter is factory set to a temperature coefficient of 2.1% per °C. For most
applications this will provide good results. See Program P5.1 on page 34 to set the
temperature coefficient to different value. See Addendum 3, “Calculating Temperature
Coefficients” to determine the appropriate temperature coefficient for your solution.
NOTE: The factory default value for normalization temperature is 25 °C. If you need to
normalize to a value other than 25 °C, see Program P5.2 on page 35.
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Instruction Manual CON 400/410
μSμ
4.3 Temperature Calibration
Your probe features a built-in temperature sensor. The
temperature sensor is factory calibrated. 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.
Temperature Calibration
1. Make sure the cell is attached to the 6-pin connector.
The ATC annunciator will appear at the right-hand
side of the LCD*.
2. Switch the meter on. Press the MODE key to select
conductivity or TDS mode.
3. Press the CAL/MEAS key to enter conductivity or
TDS calibration mode. The CAL indicator appears
above the primary display.
4. While in conductivity or TDS calibration mode, press
the MODE key to enter temperature calibration
mode. The primary display shows the current
temperature reading and the secondary display
shows the factory default temperature value.
5. Dip the cell into a solution of known temperature (i.e.
A temperature bath). Allow time for the built-in
temperature sensor to stabilise.
6. Scroll with the MI/S or MR/Tkeys to set the correct
temperature value (i.e. the temperature of the
temperature bath). You can adjust the reading in
increments of 0.1 °C.
7. Once you have selected the correct temperature,
press the ENTER key.
* If the ATC indicator does not light up, see Program P4.3
to switch it on.
NOTES:
•You can offset the temperature reading up to ±5°C from
the original reading (default reading).
•To exit this program without confirming the temperature
calibration value, DO NOT press ENTER. Press
CAL/MEAS instead.
•If the ATC indicator does not light, see Program P4.3,
on page 32 to switch it on.
•Since temperature readings affect the accuracy of the
conductivity/TDS measurements, it is strongly
recommended to carry out a conductivity/TDS
calibration after a temperature calibration is done.
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MEAS
1413
L
A
C
S
A
E
M
1413
E
D
O
M
22.3
I
M
22.0
R
E
T
N
E
E
G
N
A
R
MEAS
READY
1425
Figure 10 - Temperature
Calibration
22.3
CAL
22.3
CAL
22.3
CAL
22.3
22.0
°C
ATC
S
°C
ATC
°C
ATC
R
M
°C
ATC
μ
S
°C
ATC
Page 16
Instruction Manual CON 400/410
4.4 Conductivity Calibration
The CON 400 and CON 410 meters are capable of up
to 5-point conductivity calibration at one point per
All new calibration data will over-ride existing stored
calibration data for each measuring range calibrated.
Calibrating for Conductivity:
1. If necessary, press the MODE key to select
conductivity mode.
2. Rinse the probe thoroughly with de-ionized (DI)
water or a rinse solution, then rinse with a small
amount of calibration standard.
3. With the yellow probe guard attached, dip the
probe into the calibration standard. Immerse the
probe tip beyond the upper steel band. Stir the
probe gently to create a homogeneous sample.
Allow time for the reading to stabilise.
See Figure 7.
4. Press CAL/MEAS to enter conductivity
calibration mode. The CAL indicator will appear
in the upper right corner of the display.
5. Press the MI/S or MR/T key to change the
value on the primary display to match the value
of the calibration standard referenced to your
normalisation temperature (usually 25°C).
6. Press ENTER to confirm calibration value. The
meter returns to the MEAS (measurement) mode.
7. Repeat steps 1 to 6 for other measuring ranges.
See figure 6.
Figure 6 - Conductivity Calibration
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Instruction Manual CON 400/410
NOTES:
When entering calibration mode, the meter
displays the factory default value. If the meter
was previously calibrated, the display may
seem to “jump” to the factory default value
when switching from measurement to
calibration mode. This is expected.
To exit from Conductivity calibration
mode without confirming calibration, DO
NOT press the ENTER key in step 6. Press
CAL/MEAS instead. This will retain the
meter’s old calibration data in the measuring
range of the calibration.
You can offset the conductivity reading up to
±40% from factory default value. If your
measured value differs by more than ±40%,
clean or replace probe if needed.
Figure 7 - Proper Immersion of
the conductivity probe
The minimum offset reading allowable is
limited to 10% of full scale reading of the
range you are working in. The maximum offset reading allowed is the range full scale reading
Eutech Instruments/ Oakton Instruments offers a wide selection of high-quality calibration
standards. See page 44 for more information.
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Instruction Manual CON 400/410
4.5 TDS Calibration
4.5.1 Calibrating for TDS directly
For CON 410 meter only
The factory default setting for the TDS conversion factor is
0.50. If your solution has a different TDS factor, you can
improve calibration accuracy by setting the TDS factor prior to
calibration. See page 33 for directions.
1. If necessary, press the MODE key to select TDS mode.
2. Rinse the probe thoroughly with DI water or a rinse
solution, then rinse with a small amount of calibration
standard.
3. With the yellow probe guard attached, dip the probe into
the calibration standard. Immerse the probe tip beyond
the upper steel band. Stir the probe gently to create a
homogeneous sample. Allow time for the reading to
stabilise.
4. Press CAL/MEAS to enter TDS calibration mode. The
CAL indicator will appear in the upper right corner of the
display.
5. Press the MI/S or MR/T to change the value on the
primary display to match the value of the calibration
standard referenced to your normalisation temperature
(usually 25°C).
6. Press ENTER to confirm the calibration value. The meter
returns to the MEAS (measurement) mode.
7. Repeat steps 1 to 6 for other measuring ranges.
NOTES
To exit from TDS Calibration mode without confirming
calibration, DO NOT press the ENTER key in step 6. Press
CAL/MEAS instead. This will retain the meter’s old calibration
data in the measuring range of the calibration.
You can offset the TDS reading up to ±40% from the default
setting. If your measured value differs by more than ±40%,
clean or replace probe as needed.
The minimum offset reading allowable is limited to 10% of full scale reading of the range you
are working in. The maximum offset reading allowed is the range full scale reading
Eutech Instruments/ Oakton Instruments offer a wide selection of high-quality calibration
standards. See page 44 for more information.
Figure 8 - TDS Calibration
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Instruction Manual CON 400/410
4.5.2 Calibration with Conductivity Standard and TDS factor
For CON 410 meter only
The concentration of salts dissolved in solution increases the conductivity of that solution. This
relationship varies from salt to salt and is roughly linear over a given range for a given salt.
The TDS conversion factor is the number used by the meter to convert from conductivity to
TDS.
Instead of calibrating for TDS directly (described in Section 4.5.1), you can calibrate the CON
410 meter by:
1. calibrating to conductivity standards (as described on pages 10 to 11) and then
2. entering the appropriate TDS conversion factor into the meter.
To determine the conductivity to TDS conversion factor for your solution:
• Addendum 2 explains the formula to calculate the conductivity-to-TDS
conversion factor.
Enter the TDS conversion factor into your meter as described under Section 7.5.4, in P4.4
Setting the TDS Factor on page 33.
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Instruction Manual CON 400/410
From measurement mode
1. Press Setup key to enter Set Up mode.
2. Press the S and T keys to scroll through subgroups
until you view parameter P4.0.
SETUP
cof
p 4.0
See Figure 9.
I
M
R
M
3. Press the ENTER key again. The upper display shows
a value and the lower display shows “tdS”.
4. Calculate the TDS factor of your solution. See
SETUP
ppt
ppm
Addendum 2 on page 46 for information on how to
calculate the TDS factor.
p 4.4
5. Press the S and T keys to select your calculated TDS
I
M
R
M
conversion factor.
6. Press the ENTER key to confirm selection and to
return to the subgroup menu. Press the CAL/MEAS
SETUP
0.50
ppt
ppm
key to return to measurement mode.
R
E
T
N
E
E
G
N
A
R
Figure 9 - TDS Conversion Factor
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Instruction Manual CON 400/410
5 MEASUREMENT
This meter is capable of taking measurements with automatic or manual temperature
compensation. Factory default is set with automatic temperature compensation (ATC) on.
5.1 Automatic Temperature Compensation
For automatic temperature compensation (ATC) simply
plug the conductivity/TDS probe into the meter (see page
6 for directions). The ATC indicator will light on the LCD.
NOTE: If the ATC indicator does not light, manual
temperature compensation may be selected in
the meter’s SETUP mode. See Program P4.3 on
page 32 for directions on selecting Automatic
Temperature Compensation.
Figure 11 - ATC annunciator will
light up when connected to
temperature probe
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Instruction Manual CON 400/410
5.2 Manual Temperature Compensation
IMPORTANT: For manual compensation, you must deactivate the automatic temperature
compensation feature.
5.2.1 Selecting Manual Temperature
Compensation
To select between Automatic Temperature Compensation
(ATC) and Manual Temperature Compensation in the
SETUP program P4.3. Meter default is ATC on.
P4.0 Configuration Setup
From measurement mode
1) Press SETUP key to enter Set Up mode.
2) Press the MI/S or MR/T keys to scroll through
subgroups until you view parameter P4.0.
3) Press the ENTER key three times to select parameter
4.3. The upper display shows “ATC” and the lower
display shows “P4.3”.
4) Press the ENTER key again. The upper display shows
“ATC” and the lower display shows “YES” or “NO”.
5) Press the MI/S or MR/T to select between Automatic
or Manual Temperature Compensation feature.
• YES = Automatic Temperature Compensation
activated.
• NO = Manual Temperature Compensation
activated.
6) Press the ENTER key to confirm selection and to
return to the subgroup menu. Press the CAL/MEAS
key to return to measurement mode.
NOTE:
Manual Temperature Compensation should only be
selected if the ATC fails. For non-compensated
measurements, change the temperature coefficient to
0.0% (see section 7.6.1)
Selecting Automatic or Manual
Temperature Compensation
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Instruction Manual CON 400/410
5.2.2 Setting a manual temperature compensation value
To use manual temperature compensation, you need to
manually enter the temperature value of your process into
the meter. You can select any temperature between 0 and
100 °C (32 to 212 °F). Default value is 25 °C.
To select a manual temperature compensation value
1. Switch the meter on. Press the MODE key to select
measurement mode.
2. If necessary, select ATC off as described in section
5.2.1 on page 16. The ATC indicator will not appear
on the display.
3. Press the CAL/MEAS key to enter conductivity or TDS
calibration mode. The CAL indicator will appear above
the primary display.
4. While in conductivity or TDS calibration mode, press
the MODE key to enter temperature calibration mode.
The primary display shows the current temperature
setting and the secondary display shows the default
value 25 °C (77 °F) or its last set value.
5. Check the temperature of your sample using an
accurate thermometer.
6. Press the MI/S or MR/T keys to offset the
temperature to the measured value from step 5.
7. Press ENTER to confirm the selected temperature and
to return to the conductivity or TDS measurement
mode.
The meter will now compensate conductivity or TDS readings for manually set temperature.
NOTES:
To exit this program without confirming the manual temperature compensation value, DO NOT
press ENTER in step 7. Press CAL/MEAS instead.
Figure 9 - Manual Temperature
Compensation
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Instruction Manual CON 400/410
5.3 Taking Measurements
To take readings:
1. Rinse the probe with DI 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 and the MEAS
annunciator appears on the top center of the LCD.
3. Dip the probe into the sample.
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.
4. Allow time for the reading to stabilise. Note the reading on the display.
5. CON 410 meter only
: Press the MODE key to toggle between conductivity and TDS
readings.
Taking measurements with READY indicator selected on
If the READY indicator has been activated, the READY annunciator lights when the reading is
stable. Switch the READY indicator on or off in SETUP program P 4.1. See page 30 for
directions.
Taking measurements with the auto endpoint feature selected on
When a reading is stable for more than 5 seconds, the auto endpoint feature will automatically
“hold” the reading. The “hold” indicator appears on the left side of the display. Press the HOLD
key to release the reading. Switch the Auto endpoint feature on or off in SETUP program P 4.1,
see page 30 for instructions.
Figure 10 - During measurement
- 18 -
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Instruction Manual CON 400/410
5.4 Using Manual Ranging Function
Your meter automatically selects the range in which your readings appear. The manual
ranging function lets you select the specific range (and corresponding resolution) that you
want to work in:
CON 400 and CON 410 meters: CON 410 meter:
1. 0.00 --- 19.99 μS
2. 0.0 --- 199.9 μS
3. 0 --- 1999 μS
4. 0.00 --- 19.99 mS 4. 0.00 --- 9.99 ppt
5. 0.0 --- 199.9 mS 5. 0 --- 100 ppt
1. To select the desired measuring range, press the
RANGE key while in Measurement mode. The first
range will appear on the display and the “MEAS”
indicator blinks.
2. Press the RANGE key again (if needed) until desired
range is selected.
3. To re-select the Auto-ranging function, repeatedly
press the RANGE key until the “MEAS” indicator
appears without blinking.
NOTES
If the value of the solution you are measuring is higher than
the range selected “Or” will appear on the primary display.
Press RANGE until the correct range is selected.
1. 0.00 --- 9.99 ppm
2. 0.0 --- 99.9 ppm
3. 0 --- 999 ppm
(up to 199.9 ppt depending on TDS factor
setting)
Figure 11 - Manual ranging
Figure 12 - Out-of-range
The meter resets to the Auto-ranging function once it is
turned off. You will have reset the manual ranging function
each time you turn the meter off.
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Instruction Manual CON 400/410
5.5 HOLD Function
This feature lets you freeze the display for a
delayed observation. HOLD can be used any time
in MEAS mode.
1. To hold a measurement, press the HOLD
key while in measurement mode. “HOLD” will
appear on the display.
2. To release the held value, press the HOLD
again. Continue to take measurements.
NOTE:
• This meter shuts off automatically after 20 minutes of nonuse (without key press).
• If the meter is shut off either automatically or manually, the HOLD value will be lost.
For longer storage, use the memory functions (see pages 21-22).
•Your meter has an auto endpoint feature. When this feature is switched on, and
when a reading is stable for more than 5 seconds, the display will automatically
“HOLD” the reading. The “HOLD” indicator appears. Press the HOLD key to release
the reading. To switch on or off the auto endpoint feature, see SETUP program P4.1
on page 30.
Figure 13 - HOLD function
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Instruction Manual CON 400/410
6 MEMORY AND DATA INPUT FUNCTIONS
6.1 Memory Input
Your meter stores up to 50 sets of data. Data sets
include conductivity, temperature, date and time.
To store a reading:
1. During any measurement function (MEAS), press
MI/S key to input any data into the memory.
2. MEM, “Sto” and memory number will flash. The
meter then returns to measurement mode.
3. If necessary, measure the next sample solution and
press MI/Skey to input the next data into the
memory.
See figure 14.
NOTE: If the memory is full, the first value stored will be
erased to create space for the new value.
- 21 -
Figure 14 - Memory input
Page 28
Instruction Manual CON 400/410
6.2 Memory Recall
This function recalls the previous readings stored in the
memory. You can access MR from the measurement
mode only. Memory recall is in "Last In First Out" order.
To recall readings:
1. Press the MR/T key once to retrieve the last
reading stored. The memory location screen – MEM,
“Loc” and the memory number – will flash on the
display.
2. Press the ENTER key to recall the reading stored
under that memory number.
3. Press ENTER key again to view the date and time
the reading was taken.
4. Press ENTER key again to return to the "memory
location" screen. The display automatically moves
to the next memory location screen.
5. If necessary, press the MI/S or MR/Tkeys to
select the next "memory location" screen; press the
ENTER/RANGE key to select the previous "memory
location" screen.
6. Repeat steps 2 - 5 to review additional stored data
sets.
7. To exit Memory Recall, press MEAS key to return to
Measurement mode.
NOTES:
Readings stored in memory are retained even if the units
are turned off. To erase all readings stored in memory,
use the SETUP mode P1.0 on page 27.
Figure 20 - Memory recall
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Instruction Manual CON 400/410
7 ADVANCED SETUP FUNCTIONS
The advanced setup mode lets you customised your meter’s preferences and defaults. The
Waterproof CON400 / CON410 meters features different sub-groups that organise setup
parameters.
The sub-groups are:
1. P1.0: Memory clear (CLr)
2. P2.0: Viewing calibration data (CAL)
3. P3.0: Viewing electrode data (ELE)
4. P4.0: Unit configuration (COF)
5. P5.0: Temperature (tPr)
6. P6.0: Selecting cell constant (CEL)
7. P7.0: Setting clock (CLO)
8. P8.0: Reset to factory defaults (rSt)
See Figure 22 on next page.
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Instruction Manual CON 400/410
Figure 22 - Overall view of SETUP programs
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Instruction Manual CON 400/410
7.1 Advanced SETUP Mode Overview
Press the SETUP key to enter Set up mode.
Press the MI/S or MR/T keys to scroll through sub groups.
Press ENTER key to enter a particular parameter.
See Addendum 4 on page 48 for a table of meter factory default settings.
P1.0: Memory clear
P1.0 Clear all stored readings
P2.0: Viewing previous calibration data
P2.1 First range calibration point
P2.2 Second range calibration point
P2.3 Third range calibration point
P2.4 Fourth range calibration point
P2.5 Fifth range calibration point
P3.0: Viewing electrode data
P3.1 Effective cell constant for first range
P3.2 Effective cell constant for second range
P3.3 Effective cell constant for third range
P3.4 Effective cell constant for fourth range
P3.5 Effective cell constant for fifth range
P4.0: Unit configuration
P4.1 READY indicator and auto endpoint function –
select on or off
P4.2 Select °C or °F
P4.3 Select Automatic or Manual Temperature
12.88 mS 480-mL bottle (1 pint) EC-CON-1288BT 00606-10
15.00 mS 480-mL bottle (1 pint) - 35653-13
Eutech Instruments
Ordering Code
EC-CON-10BS
EC-CON-447BS 35653-10
EC-CON-1413BS 35653-11
Oakton Instruments
Ordering Code
35653-09
- 44 -
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Instruction Manual CON 400/410
13 ADDENDUM 1: CALIBRATION TIPS
You only need one calibration for measurement throughout the entire range of the meter. If a
range was not calibrated, the meter automatically detects the closest range calibrated and
uses that calibration information. However, only the ranges that were calibrated have
maximum accuracy.
• If you are measuring in ranges near to or greater than 20 mS (10 ppt), or
near to or lower than 100 µS (50 ppm), calibrate the meter at least once a
week to get specified ±1% F.S. accuracy.
• If you are measuring in the mid-ranges and you washed the probe in
deionized water and stored it dry, calibrate the meter at least once a month.
•
Wet the probe for 10 minutes before calibrating or taking readings to saturate the probe
surface and minimize drift. If you make measurements at extreme temperatures, calibrate the
meter at least once a week.
You should only use the conductivity / TDS / temperature probe specified for these meters.
These probes have a built-in temperature sensor. If you use a different probe without a
temperature sensor, you must measure the solution temperature separately and manually
enter the solution temperature (see manual temperature compensation section on pages 16-
17 ).
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Instruction Manual CON 400/410
14 ADDENDUM 2: CALCULATING TDS CONVERSION
FACTORS
You can calibrate your meter using TDS calibration standard solutions. The calibration
standard only needs to give the TDS value at a standard temperature such as 25 °C. To
determine the conductivity-to-TDS conversion factor use the following formula:
Factor = Actual TDS ÷ Actual Conductivity @ 25 °C
Definitions:
Both the Actual TDS and the Actual Conductivity values must be in the same magnitude of
units. For example, if the TDS value is in ppm the conductivity value must be in µS; if the TDS
value is in ppt the conductivity value must be in mS.
Check your factor by multiplying the conductivity reading by the factor in the above formula.
The result should be in TDS value.
• Actual TDS: Value from the solution bottle label or as a standard you make
using high purity water and precisely weighed salts.
• Actual Conductivity: Value measured using a properly calibrated
Conductivity/Temperature meter.
14.1 “Preparing your own TDS calibration standards”.
If you are trying to measure a concentration of a fertilizer, sea salt, or other sample that uses
multiple salts that may not be relevant to commercially available KCl based standards, it may
be desirable to prepare your own TDS standards.
Since ppm is expressed as milligrams per Liter, the preparation is relatively simple with an
analytical balance. One gram of water = 1 mL = 1 cubic centimeter.
To prepare a TDS calibration standard of 750 ppm, weigh out 750 milligrams (0.75 grams) of
your salt or fertilizer and dissolve into 1000 grams (1 liter) of purified water
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Instruction Manual CON 400/410
15 ADDENDUM 3: CALCULATING TEMPERATURE
COEFFICIENTS
To determine the temperature coefficient of your sample solution use this formula:
Where:
tc = Temperature coefficient 25 = 25 °C
= Conductivity at Temp 1 CT2 = Conductivity at Temp 2
C
T1
= Temp 1 T2 = Temp 2
T
1
NOTE: A controlled temperature water bath is ideal for this procedure.
1. Immerse the probe into a sample of your solution and adjust the temperature coefficient
to 0% (that is, no compensation) by performing the following:
A. From measurement mode, press the SETUP key to enter Setup mode.
B. Press the MI/S or MR/T key until the lower display reads P5.0.
C. Press the ENTER key twice. The lower display reads tCO and the upper display
shows the temperature coefficient value.
D. Press the MR/T key until the upper display shows 0.0.
E. Press ENTER key to confirm the value.
F. Press CA/MEAS key twice to return to measurement mode.
2. Wait for 5 minutes. Note T
3. Condition the sample solution and probe to a temperature (T
different from T
, and note the conductivity reading CT2.
1
and CT1 (conductivity at T1).
1
) that is about 5 °C to 10 °C
2
NOTE: Record your results for future reference. Ideally T
and T2 should bracket your
1
measurement temperature, and should not different by more than 5 °C.
4. Calculate the temperature coefficient of your solution according to the formula shown
above.
5. Enter the temperature coefficient you calculated into the meter.
A. From measurement mode, press the SETUP key to enter Setup mode.
B. Press the MR/T key until the lower display reads P5.0.
C. Press the ENTER key twice. The lower display reads tCO and the upper display
shows the temperature coefficient value (should be 0, as per step 1 above).
D. Press the MI/S key until the upper display shows your calculated temperature
coefficient.
E. Press ENTER key to confirm the value.
F. Press CAL/MEAS key twice to return to measurement mode.
The calculated temperature coefficient will not be applied to all the meter readings.
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Instruction Manual CON 400/410
16 ADDENDUM 4: METER FACTORY DEFAULT
SETTINGS
Type Parameter Default Remarks
P1.0 Memory clear No Retains current memory
P2.1 Viewing previous –– No calibration data for 1st range
P2.2 calibration data –– No calibration data for 2nd range
P2.3 –– No calibration data for 3rd range
P2.4 –– No calibration data for 4th range
P2.5 –– No calibration data for 5th range
P3.1 Viewing probe data 1.0 No offset for effective cell constant (1st range)
P3.2 1.0 No offset for effective cell constant (2nd range)
P3.3 1.0 No offset for effective cell constant (3rd range)
P3.4 1.0 No offset for effective cell constant (4th range)
P3.5 1.0 No offset for effective cell constant (5th range)
P4.1 Ready indicator / auto
endpoint
P4.2 Select °C/°F °C Degrees Celsius
P4.3 ATC on or off ATC on ––
P4.4 TDS factor 0.50 Adjustable from 0.40 to 1.00 (available in TDS
P5.1 Temperature coefficient 2.1 % per ° C Adjustable from 0.0 to 10%
P5.2 Normalisation temperature 25° C Adjustable from 15 to 30° C
P6.1 Cell constant 1.0 Select from k=1.0, 0.1 or 10
P8.0 Factory default No Retains your current settings
NOTES:
The P7.0 clock function retains the year and time that you set, even after reverting to factory
default settings.
READY/ON Ready indicator on; auto endpoint off
400 and CON 410 meters only)
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Instruction Manual CON 400/410
17 WARRANTY
This meter is supplied with a three -year warranty, six-month warranty for probe against
significant deviations in material and workmanship.
If repair or adjustment is necessary and has not been the result of abuse or misuse within the
designated period, please return – freight pre-paid – and correction will be made without
charge. Eutech Instruments/ Oakton Instruments will determine if the product problem is due
to deviations or customer misuse.
Out of warranty products will be repaired on a charged basis.
Exclusions
The warranty on your instrument shall not apply to defects resulting from:
Improper or inadequate maintenance by customer
Unauthorised modification or misuse
Operation outside of the environment specifications of the products
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Instruction Manual CON 400/410
18 RETURN OF ITEMS
Authorisation must be obtained from our Customer Service Department or authorised
distributor before returning items for any reason. A “Return Goods Authorisation” (RGA) form
is available through our authorised distributor. Please include data regarding the reason the
items are to be returned. For your protection, items must be carefully packed to prevent
damage in shipment and insured against possible damage or loss. Eutech Instruments/
Oakton Instruments will not be responsible for damage resulting from careless or insufficient
packing. A restocking charge will be made on all unauthorised returns.
NOTE: Eutech Instruments Pte Ltd/ Oakton Instruments reserves the right to make
improvements in design, construction, and appearance of products without notice.
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NOTES
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For more information on Eutech Instruments/ Oakton Instruments’ products, contact
your nearest distributor or visit our website listed below:
Oakton Instruments
P.O Box 5136,
Vernon Hills, IL 60061, USA
Tel: (1) 888-462-5866
Fax: (1) 847-247-2984
E-mail: info@4oakton.com
Web-site: www.4oakton.com