Oakton CON 700 User manual

Instruction Manual
CON 700 Conductivity/ºC/ºF Bench Meter
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Part of Thermo Fisher Scientific 68X541702 Rev. 1 Jan 2010
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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
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6.12 CELL (Nominal Cell Constant) ................................................ 11
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
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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.
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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.
Increase value. Scroll up in SETUP & CAL modes.
MR (Memory Recall) recalls values from memory
Decrease value. Scroll down in SETUP & CAL modes.
Freezes measured reading. Press again to resume
live reading.
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2.2 LCD Annunciators
2.3 Meter Connections
CON/
Temp 8-pin DIN connection for 2-cell Con/TDS/Temp electrode
DC Power supply
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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
n the
TABLE 1, the CON 700
must be set for manual calibration instead.
conductivity, and manual calibration for TDS.
In the automatic calibration mode, the meter will automatically select
one of (4) conductivity calibration standard values depending o
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
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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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