Oakton PC 700 User manual

Instruction Manual
PC 700 pH/mV/Conductivity/ºC/ºF
Bench Meter
Technolo
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Part of Thermo Fisher Scientific 68X541704 Rev. 1 Feb. 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. 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
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9.6 3.3 buFF (pH Buffers & Calibration Points)—pH only .............13
9.7 3.3 AtC (Auto Temp Compensation)—Con & TDS only.......... 13
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 14
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
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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.
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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—
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.
2
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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
3
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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
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
c
The PC 700 meter can be calibrated with up to 5 buffers. The
non-vola
is
pH 6.2 to pH 9.5,
alibration with 4.01, 7.00, and 10.01 will work well.
tile memory retains all calibration values upon meter shut
wing calibration standards are automatically recognized;
down.
The follo
4
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5
e buffer groupSee Section 9.6 to change th
1) Press as needed to select pH.
Dip the pH and ATC electrodes into pH buffer and press2) . The
secondary display will lock on the appropriate buffer value. Provide
ing for best results. When the READY indicator appears, prstirr ess
to accept. The primary reading will flash briefly before the
secondary display begins scrolling the remaining available buffers.
Rinse the pH and ATC electrodes then dip into the next pH buffe
The secondary display will lock on the appro ate buffer value.
When the READY indicator appears, press
3) r.
pri
to accept. The
primary reading will flash briefly then display the percent efficiency
(slope) before the secondary display begins scrolling the remaining
4)
available buffers.
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 numbe
specified calibration points. To spec
r of
ify a different number of pH
int (offset) calibration is only allowed with pH 7.00 or
pted during a new calibration,
ca
calibration points see Section 9.6.
IPS: A single poT
pH 6.86 buffers.
When the first calibration value is acce
all prior libration values are erased.
ressP at any time to abort calibration and return to measurement
USA buffer group 1.68, 4.01, 7.00, 10.01, 12.45
NI 5ST buffer group 1.68, 4.01, 6.86, 9.18, 12.4
mode.
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6
tandard in which a meter/electrode system are
d
are
match the ORP value.
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 s
verified to be close to a given value, instea of being used as a
calibration standard in which adjustments made in an attempt to
1) Connect an ORP electrode and press as needed to select
(or R.mV).
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 he prima display shows
the relative millivolt value (R.m ) whi he secon ry display sho
factory default mV value.
Adjust the R.mV value using
. T ry
V le t da ws
the
) or . Press4to accept or
to cancel. The meter allows an adjustable maximum value of
150
±
mV from the factory default mV value.
es
mV.
Note: When an offset has been stored successfully, R.mV replac
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 se
one of (4) conductivity calibration standard values depending on the
range and normalization temperature being used (TABLE 1).
lect
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7
isted in TABLE 1, the PC 700 must
be set for manual calibration i
The factory default is automati
an ere i
for e 1.
TABLE
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 l
nstead.
c conductivity calibration. See Section
s no automatic calibration value9.11 to ch
available
ge this setting. Th
conductivity rang
1
Auto Calibratio esmatic n Valu
N ation Tempormaliz erature
R eang
# 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. 111.8 mS1 – 200.0 mS 102.1 mS
Range
# TDS Range
(us r)ing 0.5 TDS facto 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.
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8
his
ual calibration so that it is applied to one range
ration, perform a calibration in each
est results.
on point per range can be
calibration and between samples
y which will retain all calibration
factory default value.
e unstable and
are very temperature dependent. As a result, reproducible calibration
to 20.0
ration Procedure
Use Multi-Point Calibration for individual calibration in each range. T
will restrict an individ
only. When using multi-point calib
range that you expect to use for b
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 calibrati
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
with clean water (deionized water is ideal).
The PC 700 has non-volatile memor
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
Low conductivity standard solutions (less than 20 µS) ar
results are challenging in lowest measurement range #1 (0.00
µS).
5.4 Automatic Conductivity Calib
1) Press as needed to select conductivity (μS or mS).
2) Dip the electrode into th .e 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.
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4) When the READY indicator appears, press to accept. The
tprimary reading will flash briefly before returning to measuremen
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.
The primary display will show the current reading,3) while the
secondary display will be the factory default value. Adjust the
9
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
req mended upon probe
nt,
1) n with a known accurate temperature
e bath.
2) Press
and measurement is accurate and stable, so frequent calibration isn’t
uired. Temperature calibration is recom
replaceme whenever the temperature reading is suspect, or if
matching against a certified thermometer is desired.
Place the probe into a solutio
such as a constant temperatur
followed by . The primary display shows the
)Adjust the temperature using
measured temperature while the secondary display shows the
factory default temperature.
4or . Press to accept or
n adjustable maximum value of ± 5ºCto cancel. The meter allows a
oº
( r ± 9 F) from the factory default temperature.
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6. CONDUCTIVITY AND TDS MEASUREMENT
6.1 Taking Measurements
be into the sample beyond the upper steel band
side of the probe guard for
y.
g
measurement. Erroneous results will occur while the probe guard is
1) Rinse the electrode with de-ionized or distilled water before use
to remove any impurities. Gently shake excess water droplets.
2) Dip the pro
(utilize the fill line on the out
reference).
3) Allow time for the reading to stabilize. Note the reading on the displa
The clear yellow protective probe guard must be attached durin
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
press
select the next range,
again. After range 5, automatic ranging is resumed.
F
(r
or example, a reading of 465 μS will automatically settle in range 3
3). 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.
10
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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.
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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
12
be available to view. If no calibration is stored, the offset will be 0.0
mV and the slope is 100%.
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) 9.3 3.0 ConF (Configuration
Press to access set-up programs 3.1 thru 3.9.
3.19.4 rdY (Ready / Stability Indicator)
Press .
Press or to choose READY “On”, READY “OFF”, or
Auto HOLd.
Press to confirm.
9.5 3.2 enheit)ºC ºF (Celsius or Fahr
Press .
Press or to select ºC or ºF.
Press to confirm.
.6 3.3 buFF (pH Buffers & Calibration Points)—pH only9
Press .
Press or to select “USA” or “NIST” buffer group
de ly).(pH mo on
Press or to select number of Calibration Points
(pH and Ion only).
Press to confirm.
AtC (Auto Temp Com9.7 3.3 pensation)—Con & TDS only
Press .
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Press or to select “Yes” or “No”.
Press to confirm.
9.8 3.4 n & TDS only
ress
tdS (TDS factor)—Co
P .
Press or to select the desired TDS factor (.40 to
1.00).
Press to confirm.
9.9 3.5 t.CO (Temp efficient)—Con & TDS only
The tem c e amount of change in conductivity per
his will
erature Co
erature oefficient is thp
degree temperature (% per ºC). The PC 700 is factory set to a
temperature coefficient of 2.1 % per ºC. For most applications t
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.
9.10 3.6 t.nr (Normalization Temperature in ºC)—Con & TDS only
When Au ompensation is used, measurements
are adjusted by the temperature coefficient to the normalization
temperature. The default value is 25 ºC.
tomatic Temperature C
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Press .
Press or to select the desired value (15.0 to 30
Press
.0).
to confirm.
ACAL to nductivity Calibration)—Con & TDS only9.11 3.7 (Au Co
See Sectio for more deta atic Conductivity Calibration.
ress
n 5.1 ils on Autom
.P
Press or to select “Yes” (Automatic) or “No” (Manual).
Press to confirm.
9.12 3.8 Po
See Sectio for details on Single Point & Multi Point Calibration.
ress
SPC (Single int Calibration)—Con & TDS only
n 5.2
.P
Press or to select “Yes” (Single) or “No” (Multi).
Press to confirm.
9.13 3.8 No al
The PC 700 includes a probe with a nominal cell constant (k) of 1.0.
Use prob k parately) for improved
performa ce in extreme sample ranges. Use this setup function to
atch the
CELL ( min Cell Constant)—Con & TDS only
es with = 0.1 and 10 (sold se
n
change the cell constant if necessary. Meter default is 1.0 to m
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.
15
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9.14 4.0 rSt (Reset)
.Press
orPress to select “Yes” (Reset) or “No” (Cancel).
sIf “Yes”, pres or to select “Cal” (calibration reset
ete reset to factory default settings).only) or “FCt” (compl
Press to confirm.
CLr (Clear Mem ry)
Press
9.15 5.0 o
.
Press or to select “Yes” (Erase memory) or “No”.
Press to confirm.
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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.
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