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Instruction Manual
PC 300
Waterproof Hand-held pH/Conductivity/TDS/Temperature Meter
Technolo
adeEa
35631-00
68X248908
Rev3 01/04
Preface
This manual serves to explain the use of the Waterproof PC 300 hand-held meter. It functions in
two ways, firstly as a step by step guide to help you to operate the meter. Secondly, it serves as a
handy reference guide. It is written to cover as many anticipated applications of the Waterproof PC
300 hand-held meter as possible. If there are doubts in the use of the PC 300, please do not
hesitate to contact the nearest Eutech Instruments/ Oakton Instruments Authorized Distributor.
Eutech Instruments/ Oakton Instruments cannot accept any responsibility for damage or
malfunction to the meter caused by improper use of the instrument.
The information presented in this manual is subject to change without notice as improvements are
made, and does not represent a commitment on the part of Eutech Instruments Pte Ltd/ Oakton
Instruments.
Copyright © Feb 2000 All rights reserved.
Eutech Instruments Pte Ltd/ Oakton Instruments
Rev3 01/04
TABLE OF CONTENTS
1 INTRODUCTION 1
2 DISPLAY AND KEYPAD FUNCTIONS 2
2.1 Display 2
2.2 Keypad 3
3 PREPARATION 4
3.1 Inserting the Batteries 4
3.2 Probe Information 5
4 CALIBRATION 7
4.1 Important Information on Meter Calibration 7
4.2 Preparing the Meter for Calibration 8
4.3 pH Calibration 8
4.4 Conductivity Calibration 11
4.5 TDS Calibration 14
4.6 Calibration with Conductivity Standard and TDS factor 15
4.7 Temperature Calibration 16
5 MEASUREMENT 18
5.1 Taking pH Measurements 18
5.2 Taking Conductivity or TDS Measurement 22
6 HOLD FUNCTION 28
7 ADVANCED SETUP FUNCTIONS 29
7.1 Advanced SETUP Mode Overview 31
7.2 P1.0: Viewing previous pH calibration data 34
7.3 P2.0: Viewing pH electrode data 35
7.4 P3.0: pH Measurement configuration 36
7.5 P4.0: Resetting to factory default settin g s (pH ) 40
7.6 P5.0: Viewing Previous Conductivity Calibration data 41
7.7 P6.0: Viewing Conductivity Probe Data 42
7.8 P7.0: Conductivity or TDS Measurement Configuration 43
7.9 P8.0 Temperature 47
8 PROBE CARE AND MAINTENANCE 50
8.1 pH Electrode care 50
8.2 Conductivity Electrode 52
9 TROUBLE SHOOTING GUIDE 53
10 ERROR MESSAGES 54
11 SPECIFICATIONS 55
12 ACCESSORIES 56
13 ADDENDUM 1: CONDUCTIVITY TO TDS CONVERSION FACTORS 58
14 ADDENDUM 2: CALCULATING TDS CONVERSION FACTORS 59
15 ADDENDUM 3: CALCULATING TEMPERATURE COEFFICIENTS 60
16 ADDENDUM 4: METER FACTORY DEFAULT SETTINGS 62
17 ADDENDUM 5: SELECTING USA OR NIST BUFFER SET IN P3.3 63
18 WARRANTY 64
19 RETURN OF ITEMS 65
Instruction Manual PC 300
1 INTRODUCTION
Thank you for selecting the PC300 waterproof portable meter. This meter is a microprocessorbased instrument that is designed to be handy capable of allowing one-hand operation. It is
capable of measuring pH, Conductivity, TDS and Temperature. It is completely
WATERPROOF --- and it FLOATS!
This meter has many user-friendly features ---- all of which are completely access ible through
the water-resistant membrane keypad. Your meter includes a conductivity electrode (cell
constant K = 1.0) with built-in temperature sensor (Order Code: EC-CONSEN91W/ 35608-50),
pH electrode (EC-FE72522-01B/ 35641-51) and batteries. Please read this manual thoroughl y
before operating your meter.
Figure 1: PC 300 meter
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Instruction Manual PC 300
2 DISPLAY AND KEYPAD FUNCTIONS
2.1 Display
The LCD has a primary and secondary display.
• The primary display shows the measured pH, conductivity or TDS.
• The secondary display shows the measured temperature.
The display also shows error messages, keypad functions and program functions.
See Figure 2.
Figure 2: Full LCD Screen
1. SETup mode indicator 8. micro-siemens indicator 15. Low battery indicator
2. MEASurement mode
indicator
3. CALibration indicator 10. parts per million indicator 17. Calibration solution
4. mV indicator 11. Temperature indicator 18. Cell constant indicator
5. % indicator 12. pH indicator 19. ON / OFF indicator
6. pH measurement indicator 13. Automa tic Temperature
7. milli-Siemens indicator 14. ERRor indicator 21. READY indicator
9. parts per thousand indicator 16. Probe indicator
indicator
20. HOLD indicator
Compensation indicator
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Instruction Manual PC 300
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 1. 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. Press MODE to toggle between pH or TDS or
CAL/MEAS Toggles between Calibration and Measurement mode.
ENTER /
RANGE
/ In Calibration mode:
SETUP Takes you into the SETUP mode. This mode lets you customize meter preference and
in the mode that you last switched off from. For example, if you shut the meter off in
conductivity measurement mode, the meter will be in conductivity measurement mode
when you switch the meter on.
To release, press HOLD again.
conductivity measurement mode.
1. If you are in pH measurement mode, press CAL/MEAS to enter pH calibration
mode.
2. If you are in conductivity measurement mode, press CAL/MEAS to enter
conductivity calibration mode.
3. If you are in TDS measurement mode, press CAL/MEAS to enter TDS
measurement calibration mode.
While in SETUP sub-menu, pressing CAL/MEAS once takes you out to the SETUP
main menu and pressing CAL/MEAS second time takes you directly into the
measurement mode.
ENTER function: Press to confirm values in Calibration mode and to confirm selections
in SETUP mode.
RANGE function (for conductivity &TDS measurements only): Press to enter manual
ranging function. The MEAS indicator blinks while in manual ranging function.
During conductivity and TDS calibration, press to scroll through calibration values.
In SETUP mode:
Press to scroll through the setup subgroup programs.
defaults, view calibration, electrode offset data, adjust for temperature coefficient and
normalization temperature.
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Instruction Manual PC 300
3 PREPARATION
3.1 Inse rting 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 PC 300
3.2 Probe Information
Your meter includes two probes:
• pH electrode with BNC connector.
• conductivity/temperature probe with a notched 6-pin connector
The temperature sensing element built into the conductivity probe will als o c omp ensa te
for pH readings as long as both probes are in your solution at the same time.
If you want to use a “3-in1” pH probe with a built-in temperature element, or if you want to use
a separate temperature probe, you will need to disconnect the conductivity probe to allow for
connection of the separate temperature sensor.
You can use any standard pH electrode with a BNC connector with this meter. Conductivity
probes, “3-in-1” pH electrodes with a built-in temperature element, and temperature probes
require a notched 6-pin connector (see Figure 4). For replacement probes, see the
“Accessories” section.
NOTE: Keep connector dry and clean. Do not touch connector with soiled hands.
To connect the pH electrode:
1. Slide the BNC connector of the probe over the BNC connector socket on the meter.
Make sure the slots of the connector are in line with the posts of the socket. Rotate and
push the connector clockwise until it locks.
2. To remove electrode, push and rotate the connector anti-clockwise. While holding onto
the metal part of the connector, pull it away from the meter.
CAUTION: Do not pull on the probe cord or the probe wires might disconnect.
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Instruction Manual PC 300
To connect the conductivity/temperature probe:
1. Line up the notch and 6 pins on the probe connector with the holes in the connector
located on the top of the meter. Push down and screw the metal sleeve to lock the probe
connector into place. See Figure 4.
2. To remove probe, unscrew the metal sleeve and slide up the probe connector. While
holding onto metal sleeve, pull probe away from the meter.
NOTE: Follow the same directions to connect an optional separate temperature element.
CAUTION: Do not pull on the probe cord or the probe wires might disconnect.
Figure 4: Connecting pH and conductivity/temperature probes
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Instruction Manual PC 300
4 CALIBRATION
4.1 Important Information on Meter Calibration
When you re-calibrate your meter, old calibration points are replaced on a “point-by-point”
basis in pH, and on a “range-by-range” basis in conductivity.
For example:
• pH:
• Conductivity:
• TDS:
To view current calibration points:
• pH: Program P1.0 in the SETUP section
• Conductivity & TDS: Program P5.0 in the SETUP section
if you previously calibrated your meter at pH 4.01, 7.00, and 10.01, and
you re-calibrate at pH 7.00, the meter retains the old calibration data at pH
4.01 and pH 10.01.
If you previously calibrated your conductivity meter at 1413 µS
in the 0 to 1999 µS range and you re-calibrate at 1500 µS (which is also in the
0 to 1999 µS), the meter will replace the old calibration data (1413 µS) in that
range. The meter will retain all calibration data in other ranges.
If you previously calibrated your conductivity meter at 300 ppm in the 0
to 999 ppm range and you re-calibrate at 500 ppm (which is also in the 0 to
999 ppm), the meter will replace the old calibration data (300 ppm) in that
range. The meter will retain all calibration data in other ranges.
To completely re-calibrate your meter, or when you use a replacement probe, it is best to
delete the old calibration data by re-setting the meter.
To reset the meter to its factory defaults:
• pH: Program P4.0 in the SETUP section
• Conductivity & TDS: Program P9.0 in the SETUP section
NOTE: Re-setting the meter will set meter to factory defaults. Conductivity and pH must be
reset separately.
For directions on how to calibrate your meter:
• See section 4.3 for pH calibration.
• See section 4.4 for conductivity calibration.
• See section 4.4 for TDS calibration.
• See section 4.5 for Temperature calibration.
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Instruction Manual PC 300
4.2 Prep aring the Meter for Calib ration
Before starting calibration, make sure you are in the correct measurement mode. When you
switch on the meter, the meter starts up in the measurement mode you shut it off in. For
example, if you shut the meter off in pH measurement mode, the meter will come back into pH
measurement mode when you switch the meter on.
4.3 pH Calibration
NOTE: We recommend that you perform at least 2-point calibration using standard
buffers that bracket (one above and one below) the expected sample range.
Preparing for pH calibration
This meter is capable of up to 5-point pH calibration to ensure accuracy across the entire pH
range of the meter. Select from the following buffer options:
• pH 1.68, 4.01, 7.00, 10.01 and 12.45 (USA)
• pH 1.68, 4.01, 6.86, 9.18, 12.45 (NIST)
The meter automatically recognizes and calibrates to these standard buffer values, which
makes pH calibration faster and easier.
Be sure to remove the protective electrode storage bottle or ru bber cap of t he electrode
before calibration or measurement. If the electrode has been s tored dry, wet the electrode
in tap water for 10 minutes before calibrating or taking readings to saturate the pH electrode
surface and minimize drift.
Wash your electrode in de-ionized water after use, and store in electrode storage solution. If
storage solution is not available, use pH 4.01 or 7.00 buffer solution.
Do not reuse buffer solutions after calibration. Contaminants in the solution can affect the
calibration and eventually the accuracy of the measurements. See Section on Accessories for
information on our high-quality pH buffer solutions.
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Instruction Manual PC 300
To Calibrate pH:
1. If necessary, press the MODE key to select pH
mode. The pH indicator appears in the upper right
hand corner of the display.
2. Rinse the prob e thoroughly with de-ionized water
or a rinse solution. Do not wipe the probe; this
causes a build-up of electrostatic charge on the
glass surface.
3. Dip the probe into the calibration buffer. The end of
the probe must be completely immersed into the
sample. Stir the probe gently to create a
homogeneous sample.
NOTE: The temperature element is in the conductivity
cell. For temperature compensated readings, dip
the conductivity cell into the calibration buffer as
well.
4. Press CAL/MEAS to enter pH calibration mode.
The CAL indicator will be shown. The primary
display will show the measured reading while the
smaller secondary display will indicate the pH
standard buffer solution.
5. Wait for the measured pH value to stabilize. See
Figure 5.
9
Figure 5 - pH Calibration
Instruction Manual PC 300
6. Press ENTER to confirm calibration. The meter is
now calibrated to the current buffer. The lower
display scrolls through the remaining buffer options.
• If you are performing multi-point calibration, go
to step 7.
• If you are performing one-point calibration, go
to step 9.
7. Rinse the electro de with de-ionized water or in rinse
solution, and place it in the next pH buffer.
8. Follow steps 5 to 8 for additional calibration points.
See Figure 6.
9. When calibration is complete, press CAL/MEAS to
return to pH measurement mode.
Figure 6 - Next point calibration for
pH 4.01
NOTES:
To exit from pH calibration mode without
confirming calibration, DO NOT press ENTER in
step 6. Press CAL/MEAS instead.
If the selected buffer value is not within ±1.0 pH from
the measured pH value: the electrode and buffer icon
blink and the ERR annunciator appears in the lower left
corner of the display. See Figure 7.
To limit the number of pH buffer values available during
calibration, see SETUP section P3.2.
10
Figure 7 - Err message and
electrode icon will appear if
incorrect buffer are used
Instruction Manual PC 300
4.4 Conductivity Calibration
The PC 300 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. All new calibration data will
over-ride existing stored calibration data for each measuring range you calibrate.
• 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.
• If you take measurements at extreme temperatures, calibrate the meter
at least once a week.
Preparing for conductivity calibration
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 conducti vity range,
use a 1413 µS solution for calibration.
Table 1 - Range Indicator and its corresponding ranges
Range
indicator
r 1
r 2
r 3
r 4 0.00 Æ 19.99 mS 6.00 to 17.00 mS 1.00 Æ 9.99 ppt 3.00 to 8.50 ppt
r 5 0.0 Æ 199.9 mS 60.0 to 170.0 mS 10.0 Æ 200 ppt 30.0 to 170 ppt
Conductivity
Range
0.00 Æ 19.99 µS 6.00 to 17.00 µS
0.0 Æ 199.9 µS 60.0 to 170.0 µS
0 Æ 1999 µS 600 to 1700 µS
Recommended Calibration
Solution Range
TDS Range Recommended Calibration
Solution Range
0.00 Æ 9.99 ppm 3.00 to 8.50 ppm
10.0 Æ 99.9 ppm 30.0 to 85.0 ppm
100 Æ 999 ppm 300 to 850 ppm
Temperature Coefficient: These meters are factory set to a temperature coefficient of 2.1 %
per °C. For most applications this will provide good results. See Program P8.1 in
Section 7.9 to set the temperature coefficient to different value. See Addendum 3,
“Calculating Temperature Coefficients” to determine the appropriate temperature
coefficient for your solution.
Normalization Temperature: The factory default value for normalization temperature is 25
°C. If you need to normalize to a value other than 25 °C, see Program P8.2 in Section
7.9.
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Instruction Manual PC 300
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.
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 thoroughl y with de-ionized water
or a rinse solution, then rinse with a small amount
of calibration standard.
3. 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. See Figure 8.
4. Wait for the measured conductivity value to
stabilize. If the READY indicator has been
activated (SETUP program P7.1), the READY
annunciator lights when the reading is stable.
5. Press CAL/MEAS to enter conductivity or TDS
calibration mode. The CAL indicator will appear in
the upper right corner of the display.
6. Press the or keys to chang e the value on the
primary display to match the value of the
calibration standard.
7. Press ENTER to confirm calibration value. The
meter returns to the MEAS (measurement) mode.
8. Repeat steps 1 to 7 for other measuring ranges.
See figure 8.
12
Figure 8 - Conductivity Calibration
Instruction Manual PC 300
NOTES:
When entering calibration mode, the meter will
display the factory default value. If the meter
was previously calibrated, the display may
“jump” to the factory default value when
switching from measurement to calibration
mode.
To exit from Conductivity calibration mode
without confirming calibration, DO NOT
press the ENTER key in step 7. 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 default setting. If your measured
Figure 9 - Proper Immersion of
the conductivity probe
value differs by more than ± 40%, clean or
replace probe as needed.
Eutech Instruments/ Oakton Instruments offers a wide selection of high-quality calibration
standards. See section on Accessories for more information.
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Instruction Manual PC 300
4.5 TDS Calibration
4.5.1 Calibrating for TDS directly
The factory default setting for TDS conversion factor is
0.5. If your solution has a different TDS factor, you can
improve calibration accuracy by setting the TDS factor
prior to calibration. See P7.4 for directions.
1. If necessary, press the MODE key to select TDS
mode.
2. Rinse the probe thoroughly with de-ionized water or
a rinse solution, then rinse with a small amount of
calibration standard.
3. 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 stabilize.
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 or keys to change the value on the
primary display to match the value of the calibration
standard.
6. Press ENTER to confirm the calibration value. The
meter returns to the MEAS (measurement) mode.
See Figure 10.
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 ± 20% from the
default setting. If your measured value differs by more
than ± 40%, clean or replace probe as needed.
14
Figure 10 - TDS Calibration
Instruction Manual PC 300
4.6 Calibration with Conductivity Standard and TDS factor
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 above), you can calibrate the PC 300 meter
by:
1. calibrating to conductivity standards (as described above) and then
2. entering the appropriate TDS conversion factor into the meter.
To determine the conductivity to TDS conversion factor for your solution:
• Addendum 1 lists some commonly used conversion factors.
• Addendum 2 describes how to calculate the TDS conversion factor for other
solutions.
Enter the TDS conversion factor into your meter as described under Section 7.5, in P7.4
Setting the TDS Factor.
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Instruction Manual PC 300
4.7 Te mperature Calibration
The conductivity electrode (EC-CONSEN91W/ 35608-50)
supplied with the meter has a built-in temperature sensor. In
addition you can also use a separate temperature sensing
element supplied by Eutech Instruments (as such
temperature probe (EC-PHWPTEMP-01W/ 35618-05), or the
“3-in-1” pH/Temperature combination electrode, (ECFE73528-01W/ 35808-71) for ATC purpose.
The conductivity probe is factory calibrated. Temperature
calibration can be done 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 is accessible during pH or
conductivity or TDS calibration.
Temperature Calibration
1. Make sure the conductivity electrode (or temperature
probe or “3-in-1” electrode) is attached to the 6-pin
connector.
2. Switch the meter on.
3. Press the CAL/MEAS key to enter calibration mode
(either from pH or conductivity mode). The CAL
indicator will appear above the primary display.
4. While in pH (or conductivity or TDS) calibration mode,
press the MODE key to enter temperature calibration
mode. The primary display shows the last set
temperature value and the secondary display shows the
temperature reading with zero offset.
5. Dip the ATC probe into a solution of known temperature
(i.e. a temperature bath). Allow time for the temperature
probe to stabilize.
Figure 11 - Temperature
Calibration in pH mode.
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Instruction Manual PC 300
6. Scroll with the and keys to set the correct temperature value (i.e. the temperature of
the temperature bath). You can adjust the reading increments of 0.1 °C.
7. Once you have selected the correct temperature press the ENTER key. The meter
automatically returns to pH measurement mode. See Figure 11.
NOTES:
• You can offset the temperature reading up to ±5 °C from original reading.
• To exit this program without confirming the temperature calibration value,
DO NOT press ENTER. Press CAL/MEAS instead.
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Instruction Manual PC 300
5 MEASUREMENT
5.1 Taking pH Measurements
5.1.1 Automatic Temperature Compensation
Automatic Temperature Compensation only occurs when a
temperature sensing element is plugged into the meter.
Temperature sensing element refers to the following probes
made specifically for this meter:
• The conductivity electrode (EC-CONSEN91W/
35608-50) with a built-in temperature sensor;
• Temperature probe (EC-PHWPTEMP-01W/
35618-05); or
• The “3-in-1” pH/Temperature combination
electrode (EC-FE73528-01W/ 35808-71).
Figure 12 - ATC annunciator will
light up when connected to
temperature probe
If there is no temperature sensor plugged into the meter, the default manual temperature
setting is automatically 25 °C. You can manually set the temperature to match your working
conditions using a separate thermometer.
For automatic temperature compensation (ATC) simply plug the temperature probe into the
meter (see page 6 for directions). The ATC indicator will light up on the LCD. See figure 12.
NOTE: The temperature sensing element must be submersed in the liquid yo u are
measuring.
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Instruction Manual PC 300
5.1.2 Manual Temperature Compensation (pH)
IMPORTANT: For manual compensation, you must
disconnect the temperature probe (see section 3.2: Probe
Information).
1. Switch the meter on. Press the MODE key to select
pH mode.
2. Press the CAL/MEAS key to enter pH calibration
mode. The CAL indicator will appear above the
primary display.
3. While in pH 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.
4. Check the temperature of your sample using an
accurate thermometer.
5. Press the or keys to set the temperature to the
measured value from step 4.
6. Press ENTER to confirm the selected temperature
and to return to the pH measurement mode.
See Figure 13.
The meter will now compensate pH readings for the
manually set temperature.
Figure 13 - Manual temperature
compensation
NOTES:
To exit this program without confirming the manual temperature compensation value, DO NOT
press ENTER in step 6. Press CAL/MEAS instead.
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Instruction Manual PC 300
5.1.3 Taking Measurements (pH)
Be sure to remove the electrode soaker bottle or
protective rubber cap on the electrode before
measurement.
To take readings:
1. Rinse the pH electrode with de-ionized or distilled
water before use to remove any impurities
adhering to the probe body. If the pH electrode
has dehydrated, soak it for 30 minutes in Eutech
Instruments electrode storage solution or 2M –
4M KCl solution (sold separately).
2. Press ON to switch on meter.
3. Press the MODE key to select pH measurement mode. The MEAS annunciator app ears
on the top center of the LCD. The ATC indicator appears in the lower right-hand corner to
indicator Automatic Temperature Compensation.
NOTE: For pH manual temperature compensation, you must disconnect the conductivity cell
from the 6-pin connector. The ATC indicator will disappear from the display. You also need to
set a manual temperature compensation value. See Section 5.1.2 to set Manual Temperature
Compensation.
Figure 14 - Measurement mode
4. Dip the probe into the sample. Since the conductivity cell contains the temperature
sensor, make sure it is also immersed in your solution.
When dipping the probe into the sample, the sensor or the glass bulb of the electrode must be
completely immersed into the sample. Stir the probe gently in the sample to create a
homogeneous sample.
5. Allow time for the reading to stabilize. Note the reading on the display. Note the reading
on the display. If the Ready indicator is selected on, it will appear when the reading is
stable.
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Instruction Manual PC 300
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 P3.1. See Section 7.4.
* The READY indicator appears and the reading holds until the measured value exceeds the
±
tolerance (
0.02 pH; ± 0.8 mV <400; ±1.2 mV > 400). Then, the READY annunciator turns
off.
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 3.1, see Section 7.4.
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Instruction Manual PC 300
5.2 Taking Conductivity or TDS Measurement
5.2.1 Automatic Temperature Compensation
For automatic temperature compensation (ATC) simply
plug the conductivity 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 P7.3 in
Section 7.8 for directions on selecting Automatic
Temperature Compensation.
Figure 15 - ATC annunciator will
light up when connected to
temperature probe
5.2.2 Manual Temperature Compensation
IMPORTANT: For manual compensation, you must deactivate the temperature probe.
Selecting Manual Temperature Compensation for conductivity
Selecting between Automatic Temperature
Compensation (ATC) and Manual Temperature
Compensation in the SETUP program P7.3 on in
Section 7.8. Meter default is ATC on.
From Conductivity or TDS measurement mode
1) Press SETUP key to enter Set Up mode.
2) Press the or keys keys to scroll through subgroups until you view parameter P7.0.
See Figure 16.
3) Press the ENTER key three times to select parameter 7.3. The upper display shows “ATC”
and the lower display shows “P7.3”.
Figure 16 - P7.0 Configuration Setup
for conductivity & TDS
4) Press the ENTER key again. The upper display shows “ATC” and the lower display shows
“YES” or “NO”.
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Instruction Manual PC 300
5) Press the or keys to select the Automatic
Temperature Compensation feature on (ATC on) or
off (ATC off). See Figure 18.
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 that the ATC indicator no longer appears on the
display.
Proceed to next section to select a manual temperature
compensation value.
Figure 18 - Turning ATC feature
23
ON or OFF
Instruction Manual PC 300
5.2.3 Setting a manual temperature compensation valu e
To use manual temperature compensation, you need to enter the temperature value of your
process into the meter. This is the value at which reading will manually temperature
compensates. You can select any temperature between 0 and 100 °C (32 to 212 °F). Default
value is 25 °C (77 °F).
To select a manual temperature compensation value
1. Switch the meter on. Press the MODE key to select
conductivity or TDS measurement mode.
2. If necessary, select ATC off as described in section
5.2.2. 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 or 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 measurement
mode. See Figure 19.
Figure 19 - Manual Temperature
Compensation
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 6. Press CAL/MEAS instead.
Setting the manual temperature compensation value for conductivity will change the manual
temperature compensation value for pH to the same value, and vice versa.
24
Instruction Manual PC 300
5.2.4 Taking Measurements (Conductivity or TDS)
To take readings:
1. Rinse the probe with de-ionized 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.
3. Press the MODE key to select conductivity or TDS measurement mode. The MEAS
annunciator appears on the top center of the LCD. The ATC indicator appears in the
lower right hand corner to indicate Automatic Temperature Compensation.
• NOTE: For conductivity manual temperature compensation, you must
de-activate the temperature sensor built into the conductivity probe and
set manual temperature compensation. See Section 5.2 for more
information. The ATC indicator will disappear from the display.
4. 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 sampl e to
create a homogenous sample. See Figure 9 in Section 4.4.
Figure 20 - During measurement
5. Allow time for the reading to stabilize. Note the reading on the display. If the READY I
indicator is selected on, it will appear when the reading is stable. See P7.1 in Section 7.8
for more information.
6. Press the MODE key to toggle between conductivity, TDS and pH readings.
NOTES: You can use the conductivity manual ranging function to select a specific range in which
your readings will appear. See Section 5.2.5: Manual ranging for directions.
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 7.1. See Section 7.8 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 7.1, See Section 7.8 for directions.
25
Instruction Manual PC 300
5.2.5 Using Auto and Manual Ranging Function (for conductivity & TDS)
Auto-ranging
Your meter automatically selects the range in which your
readings appear. For example:
1. If you dip the conductivity probe into a standard solution,
say, 12.88 mS.
2. It will automatically select the most appropriate range,
r 4, which is 0.00 to 19.99 mS (refer to Table 1 in
Section 4.4).
3. The secondary display on the LCD will momentarily
display r 4 before it switches to measured temperature
value.
4. The primary display will show the actual conductivity
value. See Figure 21.
Figure 21 - Auto-ranging
feature
26
Instruction Manual PC 300
Manual-ranging
The manual ranging function lets you select the specific range
you want to work in. Refer to Section 4.4 for the table of range.
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. See Figure 22.
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.
Figure 22 - Manual ranging
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.
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.
27
Figure 23 - Out-of-range
Instruction Manual PC 300
6 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 last key press.
• If the meter is shut off either automatically or manually, the HOLD value will be lost.
• Your meter has an auto endpoin t 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 P3.1
in Section 7.4 for pH and SETUP, program P7.1 in Section 7.8 for conductivity/TDS.
Figure 24 - HOLD function
28
Instruction Manual PC 300
7 ADVANCED SETUP FUNCTIONS
The advanced setup mode lets you customized your meter’s preferences and defaults. This
Waterproof handheld meter features different sub-groups that organize setup parameters.
The sub-groups are:
For pH For Conductivity & TDS
P 1.0 View calibration data (CAL) P 5.0 View calibration data (CAL)
P 2.0 View electrode data (ELE) P 6.0 View electrode data (ELE)
P 3.0 Unit Configuration (COF) P 7.0 Unit Configuration (COF)
P 4.0 Reset to factory default
P 8.0 Temperature (tPr)
settings (rSt)
P 9.0 Reset to factory default
settings (rSt)
See Figure 25 on next page.
29
Instruction Manual PC 300
Figure 25 - Overall view of SETUP programs for pH (on left) and conductivity/TDS (on right)
30
Instruction Manual PC 300
7.1 Ad vanced SETUP Mode Overview
1. In either pH or Conductivity measurement mode, press the SETUP key to enter Set up
mode.
2. Press the or keys to scroll through sub groups.
3. Press ENTER key to enter a particular parameter.
See Addendum 4 for a table of meter factory default settings.
SETUP in pH Measurement Mode
P1.0: View previous calibration data
P1.1 First calibration point (pH 1.68)
P1.2 Second calibration point (pH 4.01)
P1.3 Third calibration point (pH 7.00 or 6.86)
P1.4 Fourth calibration point (pH 10.01 or 9.18)
P1.5 Fifth calibration point (pH 12.45 )
Instructions on Section 7.2.
P2.0: View electrode data
P2.1 pH electrode offset
P2.2 pH electrode slope
Instructions in Section 7.3.
P3.0: Unit configuration
P3.1 READY indicator and auto endpoint function
P3.2 Number of pH calibration points: 2, 3, 4 or 5
P3.3 Select buffer group: USA or NIST
P3.4 Select °C or °F
Instructions in Section 7.4.
P4.0: Reset to factory defaults
P4.0 Reset meter to factory defaults
Instructions in Section 7.5.
– select on or off
31
Instruction Manual PC 300
SETUP in Conductivity Measurement Mode
P5.0: View previous calibration data
P5.1 First range calibration point (0.00 – 19.99 µS)
P5.2 Second range calibration point (0.0 – 199.9 µS)
P5.3 Third range calibration point (0 – 1999 µS)
P5.4 Fourth range calibration point (0. 00 – 19.99 mS)
P5.5 Fifth range calibration point (0.0 – 199.9 mS)
Instructions in Section 7.6.
P6.0: View electrode data
P6.1 Effective cell constant for first range
(0.00 – 19.99 µS)
P6.2 Effective cell constant for second range
(0.0 – 199.9 µS)
P6.3 Effective cell constant for third range (0 – 1999 µS)
P6.4 Effective cell constant for fourth range
(0.00 – 19.99 mS)
P6.5 Effective cell constant for fifth range
(0.0 – 199.9 mS)
Instructions in Section 7.7.
P7.0: Unit configuration
P7.1 READY indicator and auto endpoint function –
select on or off
P7.2 Select °C or °F
P7.3 Select Automatic or Manual Temperature
Compensation
P7.4 Setting TDS conversion factor
Instructions in Section 7.8.
P8.0: Temperature
P8.1 Adjusting temperature coefficient
P8.2 Adjusting normalization temperature
Instructions in Section 7.9.
P9.0: Reset to factory defaults
P9.0 Reset meter to factory defaults
Instructions in Section 7.9.1.
32
Instruction Manual PC 300
SETUP in TDS Measurement Mode
P5.0: View previous calibration data
P5.1 First range calibration point (0.00 – 9.99 ppm)
P5.2 Second range calibration point (0.0 – 99.9 ppm)
P5.3 Third range calibration point (0 – 999 ppm)
P5.4 Fourth range calibration point (0.00 – 9.99 ppt)
P5.5 Fifth range calibration point (0.0 – 200 ppt)
Instructions in Section 7.6.
P6.0: View electrode data
P6.1 Effective cell constant for first range
(0.00 – 9.99 ppm)
P6.2 Effective cell constant for second range
(0.0 – 99.9 ppm)
P6.3 Effective cell constant for third range (0 – 999 ppm)
P6.4 Effective cell constant for fourth range
(0.00 – 9.99 ppt)
P6.5 Effective cell constant for fifth range
(0.0 – 200 ppt)
Instructions in Section 7.7.
P7.0: Unit configuration
P7.1 READY indicator and auto endpoint function –
select on or off
P7.2 Select °C or °F
P7.3 Select Automatic or Manual Temperature
Compensation
P7.4 Setting TDS conversion factor
Instructions in Section 7.8.
P8.0: Temperature
P8.1 Adjusting temperature coefficient
P8.2 Adjusting normalization temperature
Instructions in Section 7.9.
P9.0: Reset to factory defaults
P9.0 Reset meter to factory defaults
Instructions in Section 7.9.1.
33
Instruction Manual PC 300
7.2 P1.0: View ing previous pH calibration data
This mode lets you recall previous pH calibration data, which helps you know when to recalibrate your meter. This is a “view only” mode.
From measurement mode:
1. Press the MODE key to select pH measurement
mode if necessary.
2. Press the SETUP key to enter Set up mode.
3. Press the or keys to scroll through subgroups
until you view parameter P1.0.
4. Press the ENTER key repeatedly to view previous
calibration data. See Figure 26.
USA
NIST
• P1.1 = pH 1.68 1.68
• P1.2 = pH 4.01 4.01
• P1.3 = pH 7.00 6.86
• P1.4 = pH 10.01 9.18
• P1.5 = pH 12.45 12.45
5. When you have scrolled through all calibration data,
you will automatically return to the subgroup menu.
Press CAL/MEAS key to return to measurement
mode.
NOTES:
Figure 26 – P1.0: View calibration
data for pH
If there is no previous calibration data at a particular point, the primary display will show “- - -“.
34
Instruction Manual PC 300
7.3 P2.0: View ing pH electrode data
Program 2 has two “view only” options that let you check
the electrode parameters for diagnostic purposes. It lets
you view:
• P2.1 = Electrode offset
• P2.2 = Electrode slope
From pH measurement mode
1. Press the MODE key to select pH measurement
mode.
2. Press the SETUP key to enter Set Up mode.
3. Press the or keys to scroll through subgroups
until you view parameter P2.0.
4. Press the ENTER key to select parameter 2.1.
5. The display shows the electrode offset value. It is the
mV offset at pH 7.00. If you have not calibrated at any
buffer, the primary display shows 0.00 mV.
6. Press the ENTER key to proceed to P2.2.
7. The display shows electrode slope in percentage.
Slope displayed is the average slope based on the pH
calibrations. Default setting is 100.0.
8. At any point, you can press the CAL/MEAS key to
Figure 27 - Viewing electrode's
offset and slope status from pH
measurement mode
return to measurement mode.
See Figure 27.
(The values shown above are for illustration purpose. Your meter may display different values depending on
the settings & your environmental conditions)
35
Instruction Manual PC 300
7.4 P3.0: p H Measurement configuration
This subgroup program allows to customize the meter to
your specific needs. You can program the meter to:
1. Select READY indicator ON or OFF
2. Select the number of pH calibration points
3. Select between USA and NIST buffers
4. Select between °C and °F units for temperature
readings
Figure 28 on the right shows the setup sequence for this
program subgroup.
SETUP
SETUP
READY
ON
SETUP
READY
ON
SETUP
T
N
E
A
R
E
T
N
E
N
A
R
T
N
E
A
R
cof
p 3.0
R
E
E
G
N
p 3.1
R
E
G
3 p
p 3.2
R
E
E
G
N
pH
usa
p 3.3
R
E
T
N
E
E
G
N
A
R
SETUP
C
p 3.4
Figure 28 – P 3.0: Unit
configuration program
36
°C
Instruction Manual PC 300
P3.1: READY Indicator and auto endpoint function
This program lets you select:
• “READY indicator on
” to indicate when the reading
is stable.
• “READY indicator off
• Auto endpoint function on
” for faster meter response.
. Select auto endpoint
on to “hold” the reading when it is stable for more
than 5 seconds. The display automatically freezes,
and the HOLD indicator appears on the left side of
the display. Press the HOLD key to release the
display and access other functions.
From measurement mode
1. Press the MODE key to select pH measurement
mode.
2. Press SETUP key to enter Set Up mode.
3. Press the or keys to scroll through subgroups
until you view parameter P3.0.
4. Press the ENTER key to select parameter 3.1.
5. Press the or keys to select the configuration
you require.
• OFF switches the READY indicatory off.
• ON switches the READY indicator on.
• ON and HOLD together switches the auto
endpoint feature on.
6. Press the ENTER key to confirm selection and to
proceed to step 4 of P3.2. Press the CAL/MEAS
Figure 29 – P 3.1: Selecting
READY function)
key to return to measurement mode.
NOTES:
Meter default is set for READY indicator on and auto endpoint function off.
37
Instruction Manual PC 300
You can also change the Ready indicator and auto endpoint function in Program P7.1
(available from conductivity or TDS mode). Any changes you make to the Ready indicator/auto
endpoint function in pH mode will also change in conductivity mode.
P3.2: Selecting number of pH calibration points
Program P3.2 lets you select the number of calibration
points that appear in pH calibration mode: 2, 3, 4, or 5.
The meter will automatically exit calibration mode after
you have calibrated to your selected number of points.
From measurement mode.
1. Press the MODE key to select pH measurement
mode.
2. Press SETUP key to enter Set Up mode.
3. Press the or keys to scroll through subgroups
until you view parameter P3.0.
4. Press the ENTER key twice to select parameter 3.2.
5. Press the or keys to select 2, 3, 4, or 5 point
pH calibration.
6. Press the ENTER key to confirm selection and to
return to the subgroup menu. Press CAL/MEAS key
to return to measurement mode.
See Figure 30.
P3.3 Selecting USA or NIST buffer
Program P3.3 lets you select between the following buffer
sets:
USA: pH 1.68, 4.01, 7.00, 10.01, 12.45
NIST: pH 1.68, 4.01, 6.86, 9.18, 12.45
Factory default is USA buffer set. Please refer to
Addendum 5 for P3.3 procedure.
38
Figure 30 – P3.2: Select number
of pH calibration points
Instruction Manual PC 300
P3.4 Selecting °C or °F
R
E
T
N
E
E
G
This meter lets you select between °C and °F units for
N
A
R
temperature readings.
From measurement mode
SETUP
1. Press the MODE key to select pH measurement
mode.
2. Press SETUP key to enter Set Up mode.
C
°C
p 3.4
3. Press the or keys to scroll through subgroups
until you view parameter P3.0.
4. Press the ENTER key four times to select parameter
3.4.
5. Press the or keys to toggle between °C and
°F.
SETUP
F
°F
p 3.4
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.
Figure 31 – P3.4: Select
temperature units
See Figure 31.
NOTES:
• You can switch between °C and °F in Program P7.2 (available from conductivity or TDS
mode). If you switch between °C and °F in pH mode, the meter will also switch in
conductivity or TDS mode.
39
Instruction Manual PC 300
y)
7.5 P4.0: Resetting to factory default settings (pH)
This program lets you reset all pH parameters to factory
default settings. This clears all calibration data and any
other pH setup functions you might have changed.
The following settings will remain as you have set them:
• Temperature unit of measure (°C or °F)
• The temperature offset calibration value
• All conductivity calibration data and parameters
From measurement mode
1. Press the MODE key to select pH measurement
mode.
2. Press SETUP key to enter Set Up mode.
3. Press the or keys to scroll through subgroups
until you view parameter P4.0.
Figure 32 – P4.0: Reset to factory
default values (pH 300 meter
onl
4. Press the ENTER key to enter parameter P4.0. See
Figure 32.
5. Press the or keys to toggle between NO and
YES.
• NO retains current settings
• YES resets to factory default settings.
6. Press the ENTER key to confirm selection and to return to the measurement mode.
Otherwise press CAL/MEAS key to return to measurement mode without resetting to
factory default.
Notes:
• To clear all conductivity & TDS data, see Section 7.9.1.
• See Addendum 4 for a table of factory default settings.
40
Instruction Manual PC 300
7.6 P5.0: View ing Previous Conductivity Calibration data
This mode lets you recall previous calibration data, which
helps you know when to re-calibrate your meter. This is a
“view only” mode.
This function applies for conductivity & TDS mode.
From conductivity or TDS measurement mode:
1. Press the MODE key to select conductivity or TDS
measurement mode.
2. Press the SETUP key to enter Set up mode.
3. Press the or keys to scroll through subgroups
until you view parameter P5.0.
4. Press ENTER key repeatedly to view previous
calibration data.
5. Each calibration data corresponds to each
measurement range.
• P5.1 = Range 1 (0.00 – 19.99 µS or
• P5.2 = Range 2 (0.0 – 199.9 µS or
• P5.3 = Range 3 (0 – 1999 µS or
• P5.4 = Range 4 (0.00 – 19.99 mS or
• P5.5 = Range 5 (0.0 – 199.9 mS or
0.00 – 9.99 ppm)
0.0 – 99.9 ppm)
0 – 999 ppm)
0.00 – 9.99 ppt)
0.0 – 99.9 ppt)
6. When you have scrolled through all calibration data,
you will automatically return to the subgroup menu.
Press CAL/MEAS key to return to measurement
mode.
NOTES:
If there is no previous calibration data at a particular
point, the primary display will show “- - -“.
41
Figure 33 - View calibration data
in conductivity probe
Instruction Manual PC 300
7.7 P6.0: View ing Conductivity Probe Data
Program 6 has five “view only” options that let you check
the probe’s parameters for diagnostic purposes. These
options show you the effective cell constant for each
range. The cell constant is adjusted according to your
calibration.
This function applies for conductivity & TDS mode.
From conductivity or TDS measurement mode
1. Press the MODE key to select conductivity or TDS
measurement mode.
2. Press the SETUP key to enter Set Up mode.
3. Press the or keys to scroll through subgroups
until you view parameter P6.0.
4. Press the ENTER key repeatedly to view the
effective cell constant for each range.
• P6.1 = Range 1 (0.00 – 19.99 µS or
0.00 – 9.99 ppm)
• P6.2 = Range 2 (0.0 – 199.9 µS or
0.0 – 99.9 ppm)
• P6.3 = Range 3 (0 – 1999 µS or
0 – 999 ppm)
• P6.4 = Range 4 (0.00 – 19.99 mS or
0.00 – 9.99 ppt)
• P6.5 = Range 5 (0.0 – 199.9 mS or
0.0 – 99.9 ppt)
5. When you have scrolled through all probe data, you
will automatically return to the subgroup menu. Press
the CAL/MEAS key to return to measurement mode.
See figure 34.
Notes
Figure 34 - View probe data for
each measurement range
Cell constants will degrade with time and usage. You
can use this feature to alert you to the need for a new
probe prior to total failure.
(The values shown above are for illustration purpose. Your meter may display diffe rent values depending on the settings &
your environmental conditions)
42
Instruction Manual PC 300
7.8 P7.0: Condu ctivity or TDS Measurement Configuration
P7.1: READY indicator and auto endpoint function
This program lets you select:
• “READY indicator on
” to indicate when the reading
is stable.
• “READY indicator off
• Auto endpoint functi on on
” for faster meter response.
. Select auto endpoint on
to “hold” the reading when it is stable for more than 5
seconds. The display automatically freezes, and the
HOLD indicator appears on the left side of the
display. Press the HOLD key to release the display
and access other functions.
From measurement mode
1. Press the MODE key to select conductivity or TDS
measurement mode.
2. Press SETUP key to enter Set Up mode.
3. Press the or keys to scroll through subgroups
until you view parameter P7.0.
4. Press ENTER key to select parameter 7.1.
5. Press the or keys to select the configuration
you require.
• OFF switches the READY indicator off;
• ON switches the READY indicator on.
• ON and HOLD together switches the auto
endpoint feature on.
6. Press ENTER key to confirm selection and to
proceed to step 4 of P7.2. You can also press the
CAL/MEAS key to return back to measurement
Figure 35 - Configuring the
Figure 36 – P 3.1: Selecting
READY feature
READY function)
mode.
NOTE: Meter default is set for Ready Indicator on, and auto endpoint function off.
43
Instruction Manual PC 300
P7.2 Selecting °C or °F
You can select between °C and °F units for temperature
readings. Meter default is °C.
From measurement mode
7. Press the MODE key to select conductivity
measurement mode.
8. Press SETUP key to enter Set Up mode.
9. Press the or keys to scroll through subgroups
until you view parameter P7.0.
10. Press the ENTER key two times to select parameter
7.2.
11. Press the or keys to toggle between °C and °F.
12. Press the ENTER key to confirm selection and to
proceed to step 3 of P7.3. Press the CAL/MEAS
key to return to measurement mode.
Figure 37 - Change Temperature
measurement unit
See Figure 37.
NOTES:
• You can switch bet ween °C and °F in Program P3.3 (available from pH mode). If you
switch between °C and °F in conductivity mode, the meter will also switch in pH mode.
44
Instruction Manual PC 300
P7.3 Selecting Automatic or Manual Temperature Compensation
This feature lets you select between Automatic
Temperature Compensation (ATC) and Manual
Temperature Compensation. Meter default is ATC.
From measurement mode
1. Press the MODE key to select conductivity
measurement mode.
2. Press SETUP key to enter Set Up mode.
3. Press the or keys to scroll through subgroups
until you view parameter P7.0.
4. Press the ENTER key three times to select
parameter 7.3. The upper display shows “ATC” and
the lower display shows “P7.3”.
5. Press the ENTER key again. The upper display
shows “ATC” and the lower display shows “YES” or
“NO”.
6. Press the or keys to select the Automatic
Temperature Compensation on or off.
• YES = ATC on; NO = ATC off
7. Press the ENTER key to confirm selection and
proceed to P7.4 next page. Press the CAL/MEAS
key to return to measurement mode.
45
Figure 38 - Selecting ATC on or off
Instruction Manual PC 300
P7.4 Setting the TDS factor
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.
To determine the conductivity to TDS conversion
factor for your solution:
Addendum 1 and 2 on this sheet describes the
conversion factors and how to calculate the TDS
conversion factor for other solutions.
You can set the TDS conversion factor between 0.4 and
1.0; meter default is 0.5.
From measurement mode
1. Press SETUP key to enter Set Up mode.
2. Press the or keys to scroll through subgroups
until you view parameter P7.0.
3. Press the ENTER key five times to select parameter
7.4. The upper display shows “tdS” and the lower
display shows “P7.4”.
4. Press the ENTER key again. The upper display
shows a value and the lower display shows “tdS”.
5. Calculate the TDS factor of your solution. See
Addendum 2 on this sheet for information on how to
calculate the TDS factor.
6. Press the or keys to select your calculated
TDS conversion factor.
7. Press the ENTER key to confirm selection and to
return to the subgroup menu. Press the CAL/MEAS
key to return to measurement mode.
46
Figure 39 - Change of TDS factor
Instruction Manual PC 300
7.9 P8.0 Temperature
P8.1 Selecting the temperature coefficient
The temperature coefficient is the amount of change in
conductivity per degree of temperature; it is expressed
in percent per °C. Entering the exact temperature
coefficient of your solution lets you accurately
compensate temperature for almost any solution *.
You can adjust 0.0 to 10.0 % per °C. Meter default is
2.1% per °C.
From measurement mode
1. Press the MODE key to select conductivity
measurement mode.
2. Press SETUP key to enter Set Up mode.
3. Press the or keys to scroll through
subgroups until you view parameter P8.0.
4. Press the ENTER key to select parameter 8.1.
The display shows “t.CO” on the upper display.
5. Press the ENTER key again. The upper display
shows the temperature coefficient and the lower
display shows “t.CO”.
6. Press the or keys to select the temperature
coefficient of your solution.
7. Press the ENTER key to confirm selection and to
proceed to step 3 of P8.2. Press the CAL/MEAS
key twice to return to measurement mode.
Notes
* If you do not know the temperature coefficient of your
solution you can determine the correct value using the
formula in Addendum 3 “Calculating Temperature
Coefficients”.
47
Figure 40 - Changing the
temperature coefficient
Instruction Manual PC 300
P8.2 Adjusting the normalization temperature
Your meter will normalize its conductivity
measurements to a standard temperature that you can
select. You can adjust the normalization temperature
from 15 to 30 °C (59 to 86 °F). Meter default is 25 °C
(77 °F).
From measurement mode
1. Press the MODE key to select conductivity
measurement mode.
2. Press SETUP key to enter Set Up mode.
3. Press the or keys to scroll through
subgroups until you view parameter P8.0.
4. Press the ENTER key three times to select
parameter 8.2. The display shows “t.nr” on the
upper display.
5. Press the ENTER key again. The upper display
shows the normalization temperature and the
lower display shows “t.nr”.
6. Press the or keys to select the
normalization temperature.
7. Press the ENTER key to confirm selection and to
return to the subgroup menu. Press CAL/MEAS
key to return to measurement mode.
48
Figure 41 - Adjusting the
normalization temperature
Instruction Manual PC 300
7.9.1 P9.0: Resetting to factory default settings (conductivity)
Program 9.0 lets you reset all parameters to factory
default settings. This clears all calibration data and
any other conductivity setup functions you might
have changed.
From measurement mode
1. Press the MODE key to select conductivity
measurement mode.
2. Press SETUP key to enter Set Up mode.
3. Press the or keys to scroll through
subgroups until you view parameter P9.0.
4. Press the ENTER key to enter parameter P9.0.
5. Press the or keys to toggle between NO
and YES.
• NO retains current settings; YES resets
to factory default settings.
6. Press the ENTER key to confirm selection and
to return to the measurement mode. Otherwise
press CAL/MEAS key to return to
measurement mode without resetting to factory
default.
See Figure 42.
Notes:
To clear all pH data, see Section 7.5.
See Addendum 4 for a table of factory default settings.
Figure 42 – P9.0: Reset to factory
default values
49
Instruction Manual PC 300
8 PROBE CARE AND MAINTENANCE
8.1 pH Electrode care
Since your pH electrode is susceptible to dirt and contamination, clean it every one to three
months depending on the extent and condition of use.
NOTE: For specialty electrode care, consult the instruction manual included with your
electrode.
pH electrode storage
For best results, always keep the pH bulb wet. Use the protective electrode storage bottle or
rubber cap filled with electrode storage solution to store your electrode. Also, you can store in
a pH 4 buffer with 1/100 part of saturated KCl. Other pH buffers are OK for storage, but
NEVER use distilled water for storage.
After measuring
1. Rinse the pH electrode and reference junction in de-ionized water.
2. Store the electrode as recommended above in “pH electrode storage,” or as
recommended by the manufacturer.
3. Prior to next use, rinse the liquid junction with de-ionized water and tap dry – never wipe
electrode.
NOTE: If this does not restore electrode to normal response, see “Reactivating the pH
electrode” section below.
pH electrode cleaning
• Salt deposits: Dissolve the deposits by immersing the electrode in tap water for ten to
fifteen minutes. Then thoroughly rinse with distilled water.
• Oil/Grease film: wash electrode pH bulb gently in some detergent and water. Rinse
electrode tip with distilled water or use a general purpose electrode cleaner (see
ordering information).
• Clogged reference junction: Heat a diluted KCl solution to 60 to 80 C. Place the
sensing part of the electrode into the heated solution for about 10 minutes. Allow the
electrode to cool in some unheated KCl solution.
• Protein deposits: Prepare a 1% pepsin solution in 0.1 M of HCl. Set the electrode in
the solution for five to ten minutes. Rinse the electrode with distilled water.
50
Instruction Manual PC 300
Reactivating the pH electrode
If stored and cleaned properly, your pH electrode should be ready for immediate use.
However, a dehydrated bulb may cause sluggish response. To rehydrate the bulb, immerse
the electrode in a pH 4 buffer solution for 10 to 30 minutes. If this fails, the electrode requires
activation. Never touch or rub glass bulb. Contact builds up an electro-static charge.
pH electrode activation (for glass body electrodes only)
WARNING: Only qualified persons proficient with the safe handling of dangerous chemicals
should perform the procedure below. Provide proper containers, fume hoods, ventilation, and
waste disposal. Safety goggles and protective clothing must be worn while performing this
procedure. If possible, replace with another electrode instead of performing this re-activation
procedure.
1. Dip or stir the pH electrode in alcohol for 5 minutes.
2. Leave the electrode in tap water for 15 minutes.
3. Dip and stir the electrode in concentrate acid (such as HCl or H
) for five minutes.
2SO4
4. Repeat Step 2.
5. Dip and stir in strong base (NaOH) for five minutes.
6. Leave for 15 minutes in tap water.
7. Now test with standard calibration buffer solutions to see if the electrode yields
acceptable results. You may repeat step 3 through 6 up to three times for better
response. If the response does not improve, then your electrode is no longer functioning.
Replace with a new electrode – call your distributor for information.
51
Instruction Manual PC 300
8.2 Conductivity Electrode
Keep the conductivity probe clean. Rinse the probe twice,
and gently swirl it while you take readings. For best
accuracy, soak a dry probe for at least 5 to 10 minutes or
longer before calibration. Rinse the probe with de-ionized
water before storing. Never scratch the bands with a hard
substance. Do not strike the probe against any hard
surface.
Do not immerse the probe in oily solutions. Clean the
electrode thoroughly by stirring it in a mild detergent bath
or isopropyl alcohol. Wipe the probe with a soft tissue
paper. Rinse thoroughly in tap water and then in deionized water. Recalibrate the meter after cleaning the
probe.
The conductivity probe (Order Part No. ECCONSEN91W/ 35608-50) which is included with your
meter features a removable probe guard to make
cleaning easy.
To remove probe guard:
1. Grip yellow probe guard and twist clockwise. The
locking notch will release.
2. Slide probe guard off end of probe.
52
Figure 43 - Conductivity probe,
EC-CONSEN91W/ 35608-50
Instruction Manual PC 300
9 TROUBLE SHOOTING GUIDE
Problem Cause Solution
Press ‘ON’ key but
no display
Not responding to
key press
Unstable readings d) Air bubbles in probe.
“OR” on upper
display
Temperature
reading erratic or
lower display reads
“OR”
Slow response a) Dirty / Oily probe. a) Clean probe. See “Probe
a) Batteries not in place
b) Batteries not in correct polarity
(+ and – position).
c) Weak batteries
a) HOLD mode in operation.
b) Damaged key pad.
c) Internal program error.
e) Dirty probe.
f) Probe not deep enough in
sample.
g) External noise pickup or
induction caused by nearby
electric motor.
h) Broken probe.
a) Probe is shorted.
b) Probe is in an out-of-range
solution.
c) Broken probe.
a) Temperature of solution is
out of range.
a) Check that batteries are in
place and making good
contact.
b) Re-insert batteries with correct
polarity.
c) Replace batteries.
a) Cancel HOLD mode by
pressing Hold key.
b) Return to dealer.
c) Reset all internal programs
by reinserting batteries.
d) Tap probe to remove
bubbles.
e) Clean the probe and re-
calibrate.
f) Make sure sample entirely
covers the probe sensors.
g) Move or switch off interfering
motor.
h) Replace probe.
a) Test probe. Make sure probe
is fully connected to meter.
b) Use different solution.
c) Replace probe. See
Accessories Section.
a) Heat or cool solution.
Care & Maintenance”,
Section 8.
53
Instruction Manual PC 300
10 ERROR MESSAGES
LCD Display Indicates Cause Solution
Err annunciator Unrecognized input
CAL & Err
annunciators on /
Buffer and
electrode
indicators blink.
Battery indicator
blinks
from keypad
Calibration error. Wrong value input at
Low battery level. Need new batteries or
If an error persists, or the meter shows incorrect values, return the meter. Refer to “Warrant y”
and “Return of Items”.
For a complete diagram of the display see Section 1.
Wrong input in selected
mode.
calibration.
Dirty probe.
battery connection is
bad.
Release key. Select valid
operations depending on
mode.
Check your input value,
clean probe.
See Calibration sections or
Probe Maintenance
section.
Clean battery contacts.
Replace batteries with fresh
ones, noting polarity.
54
Instruction Manual PC 300
11 SPECIFICATIONS
Mode pH Temperature Conductivity TDS
Range
-2.00 to 16.00 pH
Resolution
0.01 pH
Accuracy
Calibration
pH Slope & Offset
Display
pH Buffer Option
Conductivity Cell
constant (k)
Conductivity
Temperature
Coefficient
Normalization
Temperature
Auto-ranging Yes Yes
Inputs
Temperature
Compensation
Operating
Temperature
HOLD function Yes
Averaging/Stability
(READY)/Auto-hold
Display Custom Dual LCD
Auto Power off 20 minutes after last key operation
Power four 1.5 V AAA-sized batteries (included)
Battery life >100 hours
Dimensions / Weight
± 0.01 pH
Up to five points with
automatic buffer
recognition
Yes
USA (pH 1.68, 4.01,
7.00, 10.01, 12.45)
NIST (pH 1.68, 4.01,
6.86, 9.18, 12.45)
1.0 1.0
BNC
-10.0 to 110.0 °C
( 14.0 to 230.0
°F)
0.1 °C
(0.1 °F)
± 0.5 °C
(±0.5 °F)
Offset in 0.1 °C
increments
6-pin round
connector
Automatic / Manual from 0 to 100 °C
0 to 50 °C
Meter: 19 cm (L) x 10 cm (W) x 6 cm (H); 320 g
Case: 34 cm (L) x 40 cm (W) x 10 cm (H); 2.2 kg
0 to 19.99 µS
0 to 199.9 µS
0 to 1999 µS
0 to 19.99 mS
0 to 199.9 mS
0.01 µS
0.01 mS
±1% Full Scale +
Up to five points
(one point per
0.0 to 10.0 % per
15.0 to 30.0 °C
(adjustable)
6-pin round
connector
Yes
0.1 µS
1 µS
0.1 mS
1 digit
range)
°C
0 to 9.99 ppm
0 to 99.9 ppm
0 to 999 ppm
0 to 9.99 ppt
0 to 99.9 ppt
Max of 199.9 ppt
based on factor
setting
0.01 ppm
0.1 ppm
1 ppm
0.01 ppt
0.1 ppt
±1% Full Scale +
1 digit
Up to five points
(one point per
range)
0.0 to 10.0 % per
°C
15.0 to 30.0 °C
(adjustable)
6-pin round
connector
55
Instruction Manual PC 300
12 ACCESSORIES
Replacement Meter and Meter accessories
Item Eutech Instruments
Ordering Code No.
Waterproof PC 300 Hand-held
pH/conductivity/TDS/Temperature meter complete
with pH electrode, conductivity probe of k=1.0
Epoxy body double junction pH electrode with 1-m
cable.
3 ring SS, Ultem body Electrode with ATC, cell
constant = 1.0, 12x110 mm, 1m cable length
“3-in-1” pH / Temperature combination electrode
with 1-m cable for waterproof PC 300
Temperature probe for Waterproof PC 300 EC-PHWPTEM-01W 35618-05
Carrying Kit with empty bottles EC-WPDRY-KIT 35632-98
Electrode Storage Solution EC-RE-005 00653-04
Electrode Cleaning Solution EC-DPC-BT 00653-06
EC-PCWP300/03K 35631-00
EC-FE72522-01B 35641-51
EC-CONSEN91W 35608-50
EC-FE73528-01W 35808-71
Oakton Instruments
Ordering Code No.
56
Instruction Manual PC 300
Calibration Solutions
Item Eutech Instruments
Ordering Code No.
pH 4.01 buffer solution, 480 ml bottle (1 pint) EC-BU-4BT 00654-00
pH 7.00 buffer solution, 480 ml bottle (1 pint) EC-BU-7BT 00654-04
pH 10.01 buffer solution, 480 ml bottle (1 pint) EC-BU-10BT 00654-08
pH 4.01 buffer sachets, 20 ml x 20 pcs. EC-BU-4BS 35653-01
pH 7.00 buffer sachets, 20 ml x 20 pcs. EC-BU-7BS 35653-02
pH 10.01 buffer sachets, 20 ml x 20 pcs. EC-BU-10BS 35653-03
1,413 µS KCl Calibration Solution in 480-ml leakproof bottle (1 pint)
12.88 mS KCl Calibration Solution in 480-ml leakproof bottle (1 pint)
2,764 µS KCl Calibration Solution in 480-ml leakproof bottle (1 pint)
10 µS conductivity standard sachet, 20 ml x 20 pcs
447 µS Conductivity Sachets (20 units x 20 ml per
box)
1,413 µS Conductivity Sachets(20 units x 20 ml per
box)
2,764 µS Conductivity Sachets(20 units x 20 ml per
box)
Note: pH buffer solutions (480-ml bottle/ 1 Pint) have ±0.01 pH accuracy at 25 °C. Conductivity standard
solutions have ±1% accuracy at 25°C.
Sachets are individually sealed, single use pouch containing 20 ml of fresh, contamination free
calibration solution. pH buffer sachets have ±0.01 pH accuracy at 25°C and conductivity sachets have
±1% accuracy at 25°C.
EC-CON-1413BT 00653-18
EC-CON-1288BT 00606-10
EC-CON-2764BT 00653-20
EC-CON-10BS
EC-CON-447BS 35653-10
EC-CON-1413BS 35653-11
EC-CON-2764BS 35653-12
Oakton Instruments
Ordering Code No.
35653-09
57
Instruction Manual PC 300
13 ADDENDUM 1: CONDUCTIVITY TO TDS
CONVERSION FACTORS
1. Factor – the conductivity to ppm TDS conversion factor. Multiply conductivity by this
factor to get ppm TDS for the type of TDS reading needed.
2. 442 – a formulation that most closely represents the conductivity to ppm relationship, on
average, for naturally occurring fresh water.
3. TDS Your Material – These columns are for you to write in your application-specific
conductivity-to-ppm values and conversion factors for future reference.
Factor = Actual TDS ÷ Actual Conductivity @ 25 °C
Conductivity at 25 °C
84 µS
447 µS
1413 µS
1500 µS
8974 µS
12,880 µS
15,000 µS
80 mS 52,168 0.6521 48,384 0.6048
ppm Value Factor ppm Value Factor
TDS KCl TDS NaCl
40.38 0.5048 38.04 0.4755
225.6 0.5047 215.5 0.4822
744.7 0.5270 702.1 0.4969
757.1 0.5047 737.1 0.4914
5101 0.5685 4487 0.500
7447 0.5782 7230 0.5613
8759 0.5839 8532 0.5688
Conductivity at 25 °C
84 µS
447 µS
1413 µS
1500 µS
8974 µS
12,880 µS
15,000 µS
80 mS 79,688 0.9961
ppm Value Factor ppm Value Factor
TDS 442 TDS Your Material
50.50 0.6563
300.0 0.6712
1000 0.7078
1050 0.7000
7608 0.8478
11,367 0.8825
13,455 0.8970
58
Instruction Manual PC 300
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.
59
Instruction Manual PC 300
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 temperatu re 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 or keys until the lower display reads P8.0.
C. Press the ENTER key twice. The lower display reads tCO and the upper display
shows the temperature coefficient value.
D. Press the key until the upper display shows 0.0.
E. Press ENTER key to confirm the value.
F. Press CAL/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 C
1
NOTE: Record your results for future reference. Ideally T
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.
and CT1 (conductivity at T1).
1
) that is about 5 °C to 10 °C
2
T2.
and T2 should bracket your
1
60
Instruction Manual PC 300
B. Press the key until the lower display reads P8.0.
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 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.
61
Instruction Manual PC 300
16 ADDENDUM 4: METER FACTORY DEFAULT
SETTINGS
Resetting the meter to factory default settings clears all calibration data and most other setup
functions you might have changed. The following settings will remain as you have set them:
• Temperature unit of measure (°C or °F)
• The temperature offset calibration value.
NOTE: Conductivity and pH data are cleared separately from each other.
• To clear pH data, see Sub group P4.0 in Section 7.5.
• To clear conductivity/TDS data, see Sub group P9.0 in Section 7.9.1.
Type Parameter Default Remarks
P1.1 View pH calibration data –– No calibration data for 1st buffer, pH 1.68
P1.2 –– No calibration data for 2nd buffer, pH 4.01
P1.3 –– No calibration data for 3rd buffer, pH 7.00
P1.4 –– No calibration data for 4th buffer, pH 10.01
P1.5 –– No calibration data for 5th buffer, pH 12.45
P2.1 View electrode offset 0.00 mV No offset adjustment
P2.2 View electrode slope 100.0 % No slope adjustment
P3.1 Ready indicator Ready On Ready indicator on; auto endpoint off
P3.2 # pH calibration points 3 3 pH calibration points available (1 – 5 pt range)
P3.3 °C or °F No default °C or °F remains as selected
P4.0 pH factory default No Retains your current settings
P5.1 Viewing conductivity or TDS –– No calibration data for range 1 (see Section 4.4)
P5.2 calibration data –– No calibration data for range 2 (see Section 4.4)
P5.3 –– No calibration data for range 3 (see Section 4.4)
P5.4 –– No calibration data for range 4 (see Section 4.4)
P5.5 –– No calibration data for range 5 (see Section 4.4)
P6.1 Viewing conductivity or TDS 1.0 No offset for effective cell constant for range 1.
P6.2 Calibration data 1.0 No offset for effective cell constant for range 2
P6.3 1.0 No offset for effective cell constant for range 3
P6.4 1.0 No offset for effective cell constant for range 4
P6.5 1.0 No offset for effective cell constant for range 5
P7.1 Ready indicator Ready On Ready indicator on; auto endpoint off
P7.2 °C or °F No default °C or °F remains as selected
P7.3 ATC on or off ATC on ––
P7.4 TDS factor 0.5 Adjustable from 0.4 to 1.0
P8.1 Temperature coefficient 2.1 % per ° C Adjustable from 0 to 10%
P8.2 Normalization temperature 25° C Adjustable from 15 to 30° C
P9.0 Conductivity factory default No Retains your current settings
pH parameters
Conductivity and TDS parameters
62
Instruction Manual PC 300
17 ADDENDUM 5: SELECTING USA OR NIST BUFFER
SET IN P3.3
As mentioned in Section 7.4: P3.3, program P3.3 lets
select between USA and NIST buffer sets:
USA: pH 1.68, 4.01, 7.00, 10.01, 12.45
NIST: pH 1.68, 4.01, 6.86, 9.18, 12.45
Factory default is USA buffer set.
From measurement mode
1. Press the MODE key to select pH measurement
mode.
2. Press SET key to enter Setup mode.
3. Press the or key to scroll through subgroups
until you view parameter P3.0.
4. Press ENTER three times to select parameter P3.3.
5. Press the or keys to toggle between USA and
NIST buffer sets.
6. Press ENTER key to confirm selection and to return
to the subgroup menu. Press CAL/MEAS key to
return to measurement mode.
See Figure 44.
SETUP
usa
p 3.3
SETUP
p 3.3
Figure 44: Selecting USA or NIST
buffer set
63
Instruction Manual PC 300
18 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 ab use or misuse
within the designated period, please return – freight pre-paid – and c orrection 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
Unauthorized modification or misuse
Operation outside of the environment specifications of the products
64
Instruction Manual PC 300
19 RETURN OF ITEMS
Authorization must be obtained from our Customer Service Department or
authorized distributor before returning items for any reason. A “Return Goods
Authorization” (RGA) form is available through our authorized 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 shipm ent 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 unauthorized returns.
NOTE: Eutech Instruments Pte Ltd/ Oakton Instruments reserves the right to make
improvements in design, construction, and appearance of products without notice.
65
NOTES
NOTES
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, IL60061, USA
Fax: (1) 847-247-2984
www.4oakton.com
www.oaktoninstruments.com
Eutech Instruments Pte Ltd.
Blk 55, Ayer Rajah Crescent,
#04-16/24 Singapore 139949
Tel: (65) 6778 6876
Fax: (65) 6773 0836
E-mail: marketing@eutechinst.com
Web-site: www.eutechinst.com
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