EUTECH INSTRUMENTS OAKTON WD-35413-21 User manual

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Instruction Manual
PC 700 pH/mV/Conductivity/ºC/ºF
Bench Meter
Part of Thermo Fisher Scientific 68X541704 Rev 4 Apr 2013
99 Washington Street
Melrose, MA 02176
Phone [phone]
Toll Free 1-800-517-8431
Visit us at www.TestEquipmentDepot.com

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. CONDUCTIVITY ELECTRODE ....................................... 4
4. PH AND MV CALIBRATION............................................ 4
4.1 pH Calibration ......................................................................... 4
4.2 Millivolt (mV) Offset Adjustment .............................................. 6
5. CONDUCTIVITY AND TDS CALIBRATION.................... 6
5.1 Automatic or Manual Calibration ............................................. 6
5.2 Single or Multi-Point Calibration .............................................. 7
5.3 General Calibration Tips ......................................................... 8
5.4 Automatic Conductivity Calibration Procedure ........................ 8
5.5 Manual Conductivity & TDS Calibration Procedure................. 9
5.6 Temperature Calibration ......................................................... 9
6. CONDUCTIVITY AND TDS MEASUREMENT ................ 10
6.1 Taking Measurements............................................................. 10
6.2 Automatic and Manual Ranging .............................................. 10
7. HOLD FUNCTION ............................................................ 11
8. STORING AND RECALLING DATA ............................... 11
9. SETUP FUNCTIONS........................................................ 12
9.1 1.0 CAL (Calibration)............................................................... 12
9.2 2.0 ELE (Electrode Information) .............................................. 12
9.3 3.0 ConF (Configuration)......................................................... 13
9.4 3.1 rdY (Ready / Stability Indicator)......................................... 13
9.5 3.2 ºC ºF (Celsius or Fahrenheit) ............................................ 13
9.6 3.3 buFF (pH Buffers & Calibration Points)—pH only ............. 13

9.7 3.3 AtC (Auto Temp Compensation)—Con & TDS only .......... 14
9.8 3.4 tdS (TDS factor)—Con & TDS only ................................... 14
9.9 3.5 t.CO (Temperature Coefficient)—Con & TDS only............ 14
9.10 3.6 t.nr (Normalization Temperature in ºC)—Con & TDS only 15
9.11 3.7 ACAL (Auto Conductivity Calibration)—Con & TDS only .. 15
9.12 3.8 SPC (Single Point Calibration)—Con & TDS only ............. 15
9.13 3.8 CELL (Nominal Cell Constant)—Con & TDS only ............. 15
9.14 4.0 rSt (Reset)......................................................................... 16
9.15 5.0 CLr (Clear Memory) .......................................................... 16
10. CALCULATING TDS CONVERSION FACTOR .............. 17
11. CALCULATING TEMPERATURE COEFFICIENTS........ 18
12. REPLACEMENTS AND ACCESSORIES........................ 19
13. TROUBLESHOOTING GUIDE......................................... 20
14. SPECIFICATIONS............................................................ 22
15. WARRANTY..................................................................... 24
16. RETURN OF ITEMS......................................................... 25

1
1. INTRODUCTION
Thank you for purchasing our PC 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 PC 700 measures pH, mV (ORP), conductivity, or TDS
simultaneously with temperature (ºC or ºF).
Each meter includes a convenient slide-out card for quick
reference. Also included is 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 PC 700 benchtop meter replaces our popular pH/CON 510
series meter that was introduced in 2000.
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—
pH/Temp, mV/Temp, Conductivity/Temp, or TDS/Temp.
Also used to switch to Temperature calibration during pH,
mV, Conductivity or TDS calibration modes.
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 Con/TDS 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.

3
2.2 LCD Annunciators
2.3 Meter Connections
DC Power supply
CON/
TEMP 8-pin DIN connection for 2-cell Con/TDS/Temp electrode
pH BNC connection for pH, or ORP (Redox) electrode

4
3. CONDUCTIVITY ELECTRODE
The PC 700 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. PH AND MV CALIBRATION
4.1 pH Calibration
For best results, periodic calibration with known accurate standards is
recommended. Calibrate with standards that bracket your intended
measuring range while including a neutral standard (pH 7.00 or 6.86).
For example, if you expect to measure samples from pH 6.2 to pH 9.5,
calibration with 4.01, 7.00, and 10.01 will work well.
The PC 700 meter can be calibrated with up to 5 buffers. The
non-volatile memory retains all calibration values upon meter shut
down.

5
The following calibration standards are automatically recognized;
See Section 9.6 to change the buffer group
1) Press as needed to select pH.
2) Dip the pH and ATC electrodes into pH buffer and press . The
secondary display will lock on the appropriate buffer value. Provide
stirring for best results. When the READY indicator appears, press
to accept. The primary reading will flash briefly before the
secondary display begins scrolling the remaining available buffers.
3) Rinse the pH and ATC electrodes then dip into the next pH buffer.
The secondary display will lock on the appropriate buffer value.
When the READY indicator appears, press to accept. The
primary reading will flash briefly then display the percent efficiency
(slope) before the secondary display begins scrolling the remaining
available buffers.
4) To calibrate another buffer repeat step 3) or press to return to
the measurement mode. Note: The meter will automatically return
to measurement mode upon successful completion of the number of
specified calibration points. To specify a different number of pH
calibration points see Section 9.6.
TIPS: A single point (offset) calibration is only allowed with pH 7.00 or
pH 6.86 buffers.
When the first calibration value is accepted during a new calibration,
all prior calibration values are erased.
Press at any time to abort calibration and return to measurement
mode.
USA buffer group 1.68, 4.01, 7.00, 10.01, 12.45
NIST buffer group 1.68, 4.01, 6.86, 9.18, 12.45

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4.2 Millivolt (mV) Offset Adjustment
Oxidization Reduction Potential (ORP or Redox) is not a precise
measurement, but is useful as a relative indicator. As such, mV offset
adjustment is not meant to enhance accuracy, but rather to make
readings comparable to a reference. Commercial ORP solutions are
often used as a check standard in which a meter/electrode system are
verified to be close to a given value, instead of being used as a
calibration standard in which adjustments are made in an attempt to
match the ORP value.
1) Connect an ORP electrode and press as needed to select mV
(or R.mV).
2) Dip the ORP electrode into a solution with a known mV value
(i.e. Zobel, Light’s, quinhydrone, or iodidetriiodide) and stir.
3) Press when the reading is stable. The primary display shows
the relative millivolt value (R.mV) while the secondary display shows
the factory default mV value.
4) Adjust the R.mV value using or . Press to accept or
to cancel. The meter allows an adjustable maximum value of ±
150 mV from the factory default mV value.
Note: When an offset has been stored successfully, R.mV replaces
mV.
5. CONDUCTIVITY AND TDS CALIBRATION
5.1 Automatic or Manual Calibration
The PC 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).

7
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 PC 700 must
be set for manual calibration instead.
The factory default is automatic conductivity calibration. See Section
9.11 to change this setting. There is no automatic calibration value
available for conductivity range 1.
TABLE 1
Range
#
Conductivity
Range
Automatic Calibration Values
Normalization Temperature
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
5.2 Single or Multi-Point Calibration
Use Single-Point Calibration to apply a single calibration value across
all ranges.

8
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.
The factory default is Single-Point Calibration. See Section 9.12 to
change this setting.
5.3 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 9.14).
Rinse or immerse the probe before calibration and between samples
with clean water (deionized water is ideal).
The PC 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).
5.4 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.

9
4) When the READY indicator appears, press to accept. The
primary reading will flash briefly before returning to measurement
mode upon successful calibration.
5.5 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
conductivity or TDS reading using or . Press to
accept. The primary reading will flash briefly before returning to
measurement mode upon successful calibration.
5.6 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.

10
6. CONDUCTIVITY AND TDS MEASUREMENT
6.1 Taking Measurements
1) Rinse the electrode with de-ionized or distilled water before use
to remove any impurities. Gently shake excess water droplets.
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
6.2 Automatic and Manual Ranging
.
The PC 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
(r3). Using manual range advancement this will read as 0.47 mS in
range 4 (r4), and 0.5 mS in range 5 (r5).
Automatic ranging is typically used since this will always provide the
best resolution.

11
7. 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 .
8. STORING AND RECALLING DATA
The PC 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.
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 9.15.

12
9. SETUP FUNCTIONS
Use the setup feature to customize your instrument operation. First,
select the appropriate measurement mode you wish to adjust by
pressing until the desired units are displayed (i.e. pH, mV,
Conductivity, or TDS). During measurement, press and hold for 5
seconds to enter SETUP mode of the parameter being measured.
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.
9.1 1.0 CAL (Calibration)
Press to view stored calibration points.
9.2 2.0 ELE (Electrode Information)
Press to view mV offset (OFS)—mV and pH modes.
Press to view % slope (SLP)—pH mode.
Press to view cell efficiency in each range—conductivity
and TDS modes.
TIP:When multiple pH slopes exist, the slope that is available to view
will depend on the measured value before entering SETUP mode.
For example, if pH calibration values pH 4.01, 7.00 and 10.01 were
completed, there will be two slope values; one that corresponds to pH
values below 7.00 and another that corresponds to pH values above
7.00. If the measured pH value was 5.23 when setup mode was
entered, the pH slope that corresponds to values lower than 7.00 will

13
be available to view. If no calibration is stored, the offset will be 0.0
mV and the slope is 100%.
9.3 3.0 ConF (Configuration)
Press to access set-up programs 3.1 thru 3.9.
9.4 3.1 rdY (Ready / Stability Indicator)
Press .
Press or to choose READY “On”, READY “OFF”, or
Auto HOLd.
Press to confirm.
9.5 3.2 ºC ºF (Celsius or Fahrenheit)
Press .
Press or to select ºC or ºF.
Press to confirm.
9.6 3.3 buFF (pH Buffers & Calibration Points)—pH only
Press .
Press or to select “USA” or “NIST” buffer group
(pH mode only).
Press or to select number of Calibration Points
(pH and Ion only).
Press to confirm.

14
9.7 3.3 AtC (Auto Temp Compensation)—Con & TDS only
Press .
Press or to select “Yes” or “No”.
Press to confirm.
9.8 3.4 tdS (TDS factor)—Con & TDS only
Press .
Press or to select the desired TDS factor (.40 to
1.00).
Press to confirm.
9.9 3.5 t.CO (Temperature Coefficient)—Con & TDS only
The temperature coefficient is the amount of change in conductivity per
degree temperature (% per ºC). The PC 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.
See Section 11 – Calculating Temperature Coefficients.
Press .
Press or to select the desired value (0.00 to 10.0).
Press to confirm.

15
9.10 3.6 t.nr (Normalization Temperature in ºC)—Con & TDS only
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.
9.11 3.7 ACAL (Auto Conductivity Calibration)—Con & TDS only
See Section 5.1 for more details on Automatic Conductivity Calibration.
Press .
Press or to select “Yes” (Automatic) or “No”
(Manual).
Press to confirm.
9.12 3.8 SPC (Single Point Calibration)—Con & TDS only
See Section 5.2 for details on Single Point & Multi Point Calibration.
Press .
Press or to select “Yes” (Single) or “No” (Multi).
Press to confirm.
9.13 3.8 CELL (Nominal Cell Constant)—Con & TDS only
The PC 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).

16
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.
9.14 4.0 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.
9.15 5.0 CLr (Clear Memory)
Press .
Press or to select “Yes” (Erase memory) or “No”.
Press to confirm.

17
10.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.