EUTECH INSTRUMENTS CON 700 - REV 3 User manual

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Instruction Manual
CON 700 Conductivity/ºC/ºF Bench Meter
Part of Thermo Fisher Scientific 68X541702 Rev. 3 Nov 2010

TABLE OF CONTENTS
1. INTRODUCTION.............................................................. 1
2. GETTING STARTED........................................................ 2
2.1 Keypad Functions ...................................................................2
2.2 LCD Annunciators...................................................................3
2.3 Meter Connections..................................................................3
3. ELECTRODE INFORMATION......................................... 4
4. CALIBRATION................................................................. 4
4.1 Automatic or Manual Calibration.............................................4
4.2 Single or Multi-Point Calibration..............................................5
4.3 General Calibration Tips .........................................................6
4.4 Automatic Conductivity Calibration Procedure........................6
4.5 Manual Conductivity & TDS Calibration Procedure.................7
4.6 Temperature Calibration .........................................................7
5. MEASUREMENT.............................................................. 7
5.1 Taking Measurements.............................................................7
5.2 Automatic and Manual Ranging..............................................8
5.3 HOLD Function .......................................................................8
5.4 Storing and Recalling Data .....................................................8
6. SETUP FUNCTIONS........................................................ 9
6.1 P1.0 CAL (Calibration)............................................................9
6.2 P2.0 ELE (Electrode Information)............................................9
6.3 P3.0 ConF (Configuration) ......................................................9
6.4 P3.1 rdY (Ready / Stability Indicator)......................................9
6.5 P3.2 ºC ºF (Celcius Or Fahrenheit).........................................10
6.6 P3.3 AtC (Automatic Temperature Compensation).................10
6.7 P3.4 tdS (Total Dissolved Solids factor)..................................10
6.8 P3.5 t.CO (Temperature Coefficient).......................................10
6.9 P3.6 t.nr (Normalization Temperature in ºC)...........................11
6.10 ACAL (Automatic Conductivity Calibration).............................11
6.11 SPC (Single Point Calibration)................................................11

6.12 CELL (Nominal Cell Constant)................................................12
6.13 P4.0 rSt (Reset) .....................................................................12
6.14 P5.0 CLr (Clear Memory).......................................................12
7. CALCULATING TDS CONVERSION FACTOR.............. 13
8. CALCULATING TEMPERATURE COEFFICIENTS........ 14
9. REPLACEMENTS AND ACCESSORIES........................ 15
10. TROUBLESHOOTING GUIDE......................................... 16
11. SPECIFICATIONS............................................................ 17
12. WARRANTY..................................................................... 18
13. RETURN OF ITEMS......................................................... 18

1
1. INTRODUCTION
Thank you for purchasing our Con 700 series benchtop meter.
This microprocessor-based meter is economical and simple to
use. The design incorporates a large LCD for clear viewing, yet
offers a small footprint to conserve space.
The CON 700 measures conductivity or TDS, and temperature
(ºC or ºF) simultaneously.
Each meter includes a convenient slide-out card for quick
reference.
Some configurations include an electrode arm and metal
bracket which can be easily attached to the left or right side of
the meter according to your preference.
The CON 700 series benchtop meter replaces our popular CON
510 series meter that was introduced in 2002.
We take great pride in every instrument we manufacture
and hope this one serves you well.

2
2. GETTING STARTED
2.1 Keypad Functions
Powers the meter on and off. Upon power on, the meter
automatically begins in the mode that was last used.
Calibration and memory values are retained even if meter
is unplugged.
Toggle between available measurement modes—
Conductivity with Temperature or TDS with Temperature.
Also used to switch to Temperature calibration during
Conductivity or TDS calibration mode.
Press and hold for 5 seconds to enter SETUP mode.
Toggles between measurement and calibration modes.
In SETUP mode, returns user to the measurement mode.
Confirms calibration values in CAL mode.
Confirms selections in SETUP mode.
Changes range and resolution in MEAS mode.
View recalled values in memory mode.
MI (Memory Insert) stores values into memory.
SIncrease value. Scroll up in SETUP & CAL modes.
MR (Memory Recall) recalls values from memory
TDecrease value. Scroll down in SETUP & CAL modes.
Freezes measured reading. Press again to resume
live reading.

3
2.2 LCD Annunciators
2.3 Meter Connections
CON/
Temp 8-pin DIN connection for 2-cell Con/TDS/Temp electrode
DC Power supply

4
3. ELECTRODE INFORMATION
The CON700 includes an electrode with a nominal cell constant of
k = 1.0, built-in temperature sensor, and 1 meter cable. 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 wetted materials of the probe include:
•Polyetherimide (Ultem) – protective probe guard
•Polybutylterphalate (Valox) – sensor housing
•Stainless Steel (SS 304) – 2 bands
The protective probe guard can be removed temporarily for
cleaning however it 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.
4. CALIBRATION
4.1 Automatic or Manual Calibration
The CON 700 is capable of automatic or manual calibration for
conductivity, and manual calibration for TDS.
In the automatic calibration mode, the meter will automatically select
one of (4) conductivity calibration standard values depending on the
range and normalization temperature being used (TABLE 1).
If you only use calibration standards that are listed in TABLE 1,
automatic calibration is recommended. If you intend to calibrate with
one or more standards that are not listed in TABLE 1, the CON 700
must be set for manual calibration instead.

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The factory default is automatic conductivity calibration. See Section
6.10 to change this setting. There is no automatic calibration value
available for conductivity range 1.
TABLE 1
Automatic Calibration Values
Normalization Temperature
Range
# Conductivity Range 25 ºC 20 ºC
r 1 0.00 – 20.00 μS None None
r 2 20.1 – 200.0 μS 84 μS 76 μS
r 3 201 – 2000 μS 1413 μS 1278 μS
r 4 2.01 – 20.00 mS 12.88 mS 11.67 mS
r 5 20.1 – 200.0 mS 111.8 mS 102.1 mS
Range
# TDS Range
(using 0.5 TDS factor) Automatic Calibration
Values
r 1 0 – 10.00 ppm none
r 2 10.1 – 100.0 ppm none
r 3 101 – 1000 ppm none
r 4 1.01 – 10.00 ppt none
r 5 10.1 – 100 ppt none
4.2 Single or Multi-Point Calibration
Use Single-Point Calibration to apply a single calibration value across
all ranges.
Use Multi-Point Calibration for individual calibration in each range. This
will restrict an individual calibration so that it is applied to one range
only. When using multi-point calibration, perform a calibration in each
range that you expect to use for best results.

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The factory default is Single-Point Calibration. See Section 6.11 to
change this setting.
4.3 General Calibration Tips
For best results, periodic calibration with known accurate standards is
recommended. A maximum of one calibration point per range can be
performed. If multiple calibration points are used in the same range,
the most recent one will replace the previous one.
When the electrode is replaced, it is best to clear the calibration to the
factory default values (see Section 6.13).
Rinse or immerse the probe before calibration and between samples
with clean water (deionized water is ideal).
The CON 700 has non-volatile memory which will retain all calibration
values, as well as meter settings and memory values upon meter shut
down or unexpected power loss.
To protect from erroneous calibrations, the allowable tolerance is ±40%
of the factory default value.
Low conductivity standard solutions (less than 20 µS) are unstable and
are very temperature dependent. As a result, reproducible calibration
results are challenging in lowest measurement range #1 (0.00 to 20.0
µS).
4.4 Automatic Conductivity Calibration Procedure
1) Press as needed to select conductivity (μS or mS).
2) Dip the electrode into the conductivity standard and press .
Provide stirring for best results.
3) The primary display will show the factory default value, while the
secondary display will lock on the appropriate automatic standard
value from TABLE 1.
4) When the READY indicator appears, press to accept. The
primary reading will flash briefly before returning to measurement
mode upon successful calibration.

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4.5 Manual Conductivity & TDS Calibration Procedure
1) Press as needed to select conductivity (μS or mS) or TDS
(ppm or ppt) calibration.
2) Dip the electrode into the calibration standard and press .
Provide stirring for best results.
3) The primary display will show the current reading, while the
secondary display will be the factory default value. Adjust the
temperature reading using or . Press to accept. The
primary reading will flash briefly before returning to measurement
mode upon successful calibration.
4.6 Temperature Calibration
The thermistor sensor used for automatic temperature compensation
and measurement is accurate and stable, so frequent calibration isn’t
required. Temperature calibration is recommended upon probe
replacement, whenever the temperature reading is suspect, or if
matching against a certified thermometer is desired.
1) Place the probe into a solution with a known accurate temperature
such as a constant temperature bath.
2) Press followed by . The primary display shows the
measured temperature while the secondary display shows the
factory default temperature.
4) Adjust the temperature using or . Press to accept or
to cancel. The meter allows an adjustable maximum value of ±
5ºC (or ± 9ºF) from the factory default temperature.
5. MEASUREMENT
5.1 Taking Measurements
1) Rinse the electrode with de-ionized or distilled water before use
to remove any impurities. Gently shake excess water droplets.

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2) Dip the probe into the sample beyond the upper steel band
(utilize the fill line on the outside of the probe guard for
reference).
3) Allow time for the reading to stabilize. Note the reading on the display.
The clear yellow protective probe guard must be attached during
measurement. Erroneous results will occur while the probe guard is
removed.
5.2 Automatic and Manual Ranging
The CON 700 automatically selects the optimum range in which your
readings appear. Refer to TABLE 1 for a list of the available ranges.
To turn-off automatic ranging, press . MEAS will flash, indicating
that manual ranging is active. To manually select the next range,
press again. After range 5, automatic ranging is resumed.
For example, a reading of 465 μS will automatically settle in range 3.
Using manual range advancement this will read as 0.47 mS in range 4,
and 0.5 mS in range 5. For best resolution, use auto-ranging.
5.3 HOLD Function
For prolonged observation of a reading, press during
measurement mode to freeze the display. The “HOLD” indicator will
display when the reading is held. To release the held value and
resume measurement, press again or insert the held value into
memory by pressing .
5.4 Storing and Recalling Data
The CON 700 can retain up to 100 data points into memory for
later retrieval.
1) In the measurement mode, press to insert the measured value
into memory. The stored memory location value (StO) is briefly
displayed.

9
2) To recall data from memory, press . The location of the most
recent stored data is displayed first. Press or to select the
location of the desired data, then press to accept.
3) Press to return to the stored data location. Press to return
to measurement mode. To erase stored data, see Section 6.14.
6. SETUP FUNCTIONS
Use the set up mode to customize your instrument operation. During
measurement, press and hold for 5 seconds to enter SETUP
mode.
Press or to change programs or change options.
Press to select the program or confirm selection.
Press to go back one level or return to measurement mode.
6.1 P1.0 CAL (Calibration)
Press to view stored calibration points in each range.
6.2 P2.0 ELE (Electrode Information)
Press to view cell efficiency in each range.
6.3 P3.0 ConF (Configuration)
Press to access set-up programs 3.1 thru 3.9.
6.4 P3.1 rdY (Ready / Stability Indicator)
Press .

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Press or to choose READY “On”, READY “OFF”, or
Auto HOLd.
Press to confirm.
6.5 P3.2 ºC ºF (Celcius Or Fahrenheit)
Press .
Press or to select ºC or ºF.
Press to confirm.
6.6 P3.3 AtC (Automatic Temperature Compensation)
Press .
Press or to select “Yes” or “No”.
Press to confirm.
6.7 P3.4 tdS (Total Dissolved Solids factor)
Press .
Press or to select the desired TDS factor (.40 to
1.00).
Press to confirm.
6.8 P3.5 t.CO (Temperature Coefficient)
The temperature coefficient is the amount of change in conductivity per
degree temperature (% per ºC). The CON 700 is factory set to a
temperature coefficient of 2.1 % per ºC. For most applications this will
provide good results. The meter allows adjustment from 0.0 to 10.0.
TIP: Select 0.0% for uncompensated measurements. The temperature
will be measured by the electrode and displayed in measurement
mode—without compensation.

11
See Section 8 – Calculating Temperature Coefficients.
Press .
Press or to select the desired value (0.00 to 10.0).
Press to confirm.
6.9 P3.6 t.nr (Normalization Temperature in ºC)
When Automatic Temperature Compensation is used, measurements
are adjusted by the temperature coefficient to the normalization
temperature. The default value is 25 ºC.
Press .
Press or to select the desired value (15.0 to 30.0).
Press to confirm.
6.10 P3.7 ACAL (Automatic Conductivity Calibration)
See Section 4.1 for more details on Automatic Conductivity Calibration.
Press .
Press or to select “Yes” (Automatic) or “No” (Manual).
Press to confirm.
6.11 P3.8 SPC (Single Point Calibration)
See Section 4.2 for details on Single Point & Multi Point Calibration.
Press .
Press or to select “Yes” (Single) or “No” (Multi).
Press to confirm.

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6.12 P3.9 CELL (Nominal Cell Constant)
The CON 700 includes a probe with a nominal cell constant (k) of 1.0.
Use probes with k = 0.1 and 10 (sold separately) for improved
performance in extreme sample ranges. Use this setup function to
change the cell constant if necessary. Meter default is 1.0 to match the
included probe.
k = 0.1 ideal for low measurements <20 µS (<10 ppm).
k = 1.0 ideal for mid-range measurements
k = 10 ideal for high measurements >20 mS (>10 ppt).
Press .
Press or to select 0.1, 1.0, or 10.0
Press to confirm.
6.13 P4.0 rSt (Reset)
Press .
Press or to select “Yes” (Reset) or “No” (Cancel).
If “Yes”, press or to select “Cal” (calibration reset
only) or “FCt” (complete reset to factory default settings).
Press to confirm.
6.14 P5.0 CLr (Clear Memory)
Press .
Press or to select “Yes” (Erase memory) or “No”.
Press to confirm.

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7. CALCULATING TDS CONVERSION FACTOR
You can calibrate TDS using the value of the calibration standard solution
at a standard temperature such as 25 ºC. To determine the conductivity-
to-TDS conversion factor use the following formula:
Factor = Actual TDS ÷ Actual Conductivity @ 25 ºC
•Actual TDS: Value from the solution bottle label or as a
standard made using high purity water and precisely weighed
salts.
ppm = milligram of salt(s) per liter of water = mg/L
ppt = gram of salt(s) per liter of water = g/L
•Actual Conductivity: Value measured using a properly
calibrated Conductivity/Temperature meter.
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.
When the TDS factor is set to 1.0, Conductivity = TDS.

14
8. CALCULATING TEMPERATURE COEFFICIENTS
To determine the temperature coefficient of your sample solution use this
formula:
Where:
tc = Temperature coefficient 25 = 25 ºC
C
T1 = Conductivity at Temp 1 CT2 = Conductivity at Temp 2
T1 = Temp 1 T2 = Temp 2
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 following
instructions as described in Section 6.8.
2. Wait for 5 minutes. Note T1 and CT1 (conductivity at T1).
3. Condition the sample solution and probe to a temperature (T2) that is
about 5 ºC to 10 ºC different from T1, and note the conductivity
reading CT2.
NOTE: Record your results for future reference. Ideally T1 and T2 should
bracket your measurement temperature, and should not differ by
more than 5 ºC.
4. Calculate the temperature coefficient of your solution according to the
formula shown above.
5. Enter the calculated temperature coefficient into the meter.
The calculated temperature coefficient will now be applied to all the meter
readings.

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9. REPLACEMENTS AND ACCESSORIES
Part number Ordering Code
Item Description Eutech Instruments Oakton Instruments
CON 700 Benchtop with electrode and
integral stand,100/240 VAC ECCON70043S 35411-00
Replacement electrode, k = 1.0 CONSEN9501D 35608-74
Epoxy/platinum electrode, k = 0.1 93X546101 35608-72
Glass/platinum electrode, k = 1.0 - 35608-76
Epoxy/platinum electrode, k = 10.0 93X546102 35608-78
SMPS, 100/240 VAC, 9V, 6W power adapter 60X030130 35615-07
10 μS, (20) x 20mL Sachets ECCON10BS 35653-09
84 µS, 480 mL bottle* ECCON84BT 00653-16
100 μS, 480 mL bottle ECCON100BT -
447 μS, 480 mL bottle ECCON447BS 00653-47
500 μS, 480 mL bottle ECCON500BT -
1413 μS, 480 mL bottle* ECCON1413BT 00653-18
1413 μS, (20) x 20mL Sachets* ECCON1413BS 35653-11
2764 μS, 480 mL bottle ECCON2764BT 00653-20
2764 μS, (20) x 20mL Sachets ECCON2764BS 35653-12
5.0 mS, 480 mL bottle ECCON5000BT -
12.88 mS, 480 mL bottle* ECCON1288BT 00606-10
15 mS, (20) x 20mL Sachets ECCON15000BS 35653-13
111.8 mS, 480 mL bottle* ECCON1118BT -
* Calibration Standard Value at 25 ºC

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10. TROUBLESHOOTING GUIDE
PROBLEM CAUSE SOLUTION
No display Main power not switched
on. AC Adapter socket not
inserted properly.
a) Switch on the power supply.
b) Re-insert AC Adapter.
“Ur” (Under
range)
“Or” (Over
range)
in primary or
secondary
display
Measured value is out
of range.
Electrodes not connected.
Electrode clogged, dirty
or broken.
Meter not calibrated.
Wrong temp value.
Check electrode is connected.
Clean or replace electrode.
Recalibrate the meter.
Confirm measurement condition.
Treat samples to bring within
meter measuring range.
Reset meter.
Slow
response Dirty electrode.
Temperature of sample is
changing.
Clean the electrode.
Allow temperature to stabilize.
Meter not
responding to
key press
Manual HOLD or Auto
HOLD is active.
Worn keypad. Press to deactivate manual
HOLD. See Section 6.4 to disable
Auto Hold feature if enabled.
Contact Technical Service.
Invalid key; Button is not
functional in the current
operation mode.
Press alternate key.
Select valid key depending on
current mode.
Secondary
display
continually
scrolls
Conductivity calibration
standard is not within 40%
of expected value during
automatic calibration.
Ensure electrode guard has not
been removed.
Use fresh or different calibration
standard.