Oakton PD 300 User manual

Instruction Manual
PD 300
Waterproof Hand-held pH/Dissolved Oxygen/Temperature Meter
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68X248910
Rev.3 JUN 06

Preface
This manual serves to explain the use of the PD 300 hand-held meter.
The manual functions as a step by step guide to help the user operate the meter and as a handy
reference guide.
This instruction manual is written to cover as many anticipated applications of the meter as
possible. If there are doubts in the use of the PD 300 meter, do not hesitate to contact the nearest
Authorised 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 © 2000
Eutech Instruments Pte Ltd/ Oakton Instruments
All rights reserved.
Rev.3 JUN 06

TABLE OF CONTENTS
1INTRODUCTION 1
2DISPLAY AND KEYPAD FUNCTIONS 2
2.1 Display 2
2.2 Keypad 3
3PREPARATION 4
3.1 Inserting the Batteries 4
3.2 Probe Information 5
4CALIBRATION 7
4.1 Important Information on Meter Calibration 7
4.2 Temperature Calibration 8
4.3 pH calibration 9
4.4 Dissolved Oxygen Calibration 12
4.5 Dissolved Oxygen Calibration in % Saturation 13
4.6 Dissolved Oxygen Calibration in mg/L (ppm) mode 15
5MEASUREMENT 17
5.1 Taking pH Measurements 17
5.2 Taking DO readings 21
5.3 Taking Pressure/Salinity Compensated DO measurements 23
6HOLD FUNCTION 24
7BACKLIT LCD 52
7.1 Using the backlit LCD 25
7.2 Adjusting the LCD brightness 25
8ADVANCED SETUP FUNCTIONS 62
8.1 Advanced SETUP Mode Detailed Overview 26
8.2 P1.0: Viewing previous pH calibration data 30
8.3 P2.0: Viewing pH electrode data 31
8.4 P3.0: pH Measurement configuration 32
8.5 P4.0: Resetting to factory default settings (pH) 36
8.6 P1.0 (dPr): Dissolved Oxygen Parameters 37
8.7 P2.0 (OFS): Offset for % Saturation Measurement 40
8.8 P3.0 [P2.0] (CAL): Previous Calibration Information
(*Program numbers in “[ ]” are for setup in mg/L (ppm) mode. 41
8.9 P4.0 [P3.0] (ELE): Electrode Properties 42
8.10 P5.0 [P4.0] COF: Unit Configuration 44
8.11 P6.0 [P5.0] LCd: Adjusting LCD Brightness 48
8.12 P7.0 [6.0] rSt: Resetting to Factory Default Setting (DO) 49
9PROBE CARE AND MAINTENANCE 05
9.1 pH Electrode care 50
9.2 Dissolved Oxygen Principle 52
9.3 Probe Care and Maintenance 53
9.4 Membrane Housing Replacement 54
9.5 Membrane/O-ring Replacement (Optional Procedure) 55
9.6 Electrolyte Solution 57
9.7 DO Probe Troubleshooting Table 58
10 TROUBLE SHOOTING GUIDE 60
11 ERROR MESSAGES 61
12 SPECIFICATIONS 62
13 ACCESSORIES 63
14 ADDENDUM 1: DISSOLVED OXYGEN & METER THEORY 66
15 ADDENDUM 2: PRESSURE VS ALTITUDE TABLE 67

16 ADDENDUM 3: METER FACTORY DEFAULT SETTINGS 68
17 WARRANTY 69
18 RETURN OF ITEMS 70

Instruction Manual PD 300
1 INTRODUCTION
Thank you for selecting the PD 300 waterproof portable meter. This meter is a
microprocessor-based instrument that is designed to allow one-hand operation. It is capable of
measuring pH, Dissolved Oxygen (mg/L or % Saturation of Oxygen) and Temperature. It is
completely WATERPROOF --- and it FLOATS!
This meter has many user-friendly features ---- all of which are completely accessible through
the water-resistant membrane keypad. Your meter includes a pH electrode (EC-DA93506-
03B / 35805-23), dissolved oxygen electrode with integrated temperature sensor in a
submersible cable (EC-DOHANDY / 35640-50), maintenance kit, and instruction manual.
These items are available in a hard, plastic carrying case which makes it ideal for outdoor field
measurement. Please read this manual thoroughly before operating your meter.
Figure 1: Waterproof PD 300 Dissolved Oxygen Meter
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Instruction Manual PD 300
2 DISPLAY AND KEYPAD FUNCTIONS
2.1 Display
The LCD has a primary and secondary display.
•The primary display shows the measured pH or DO value (either in mg/L, ppm
or %, depending on units of measurement selected).
•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 7. Oxygen solubility indicator in
mg/L or ppm.
13. Probe indicator
2. MEASurement mode indicator 8. Temperature indicator 14.Calibration indicator
3. CALibration indicator 9. pH buffer indicator 15 Function ON / OFF
indicator
4. pH indicator 10. Automatic Temperature
Compensation indicator
16 HOLD indicator
5. % saturation indicator 11. ERRor indicator 17 READY indicator
6. ppt indicator for input of
Salinity value.
12. Low battery indicator
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Instruction Manual PD 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 meter on and off. The meter powers on in the mode that you were last using.
For example, if you shut the meter off in mg/L measurement mode, the meter will be in
mg/L measurement mode when switched on. Note: The meter shuts off automatically
after 20 minutes of the last key press.
HOLD Freezes the measured reading. To activate, press HOLD while in measurement mode.
To release, press HOLD again.
NOTE: When auto endpoint feature is switched on, it automatically holds reading after 5
seconds of stability. The HOLD indicator appears on the display. Press HOLD again to
release.
MODE 1. Selects the measurement parameter. Press MODE to toggle between pH; DO %
saturation; and DO mg/L.
2. While in CAL mode under pH or mg/L (parts per million – ppm) measurement status,
this key will toggle between pH or mg/L (or ppm) calibration and temperature
calibration (refer to Section 4.2 in page 8).
CAL/MEAS Toggles between Calibration and Measurement mode.
1. In pH measurement mode, press CAL/MEAS to enter pH calibration mode.
2. In DO % saturation measurement mode, press CAL/MEAS to enter DO %
saturation calibration mode.
3. In DO mg/L (or ppm) measurement mode, press CAL/MEAS to enter DO mg/L (or
ppm) calibration mode.
4. To abort calibration, press CAL/MEAS key again to go back to measurement
mode.
While in advanced SETUP mode: Press CAL/MEAS to return to main menu from sub
menus. Press CAL/MEAS again to return to return to measurement mode from main
menu.
ENTER 1. Press to confirm your calibration values in calibration mode.
2. While in SETUP, pressing the ENTER key confirms selections.
▲/▼
In CALibration & SETUP mode:
In DO mg/L (or ppm) and temperature calibration mode, press up or down keys to
increase or decrease the values.
In SETUP mode, press up or down keys to scroll through the setup subgroup programs.
Within the SETUP sub-menu group, press up or down keys to change values.
SETUP Takes you into the SETUP mode. This mode lets you customise meter preference and
defaults, view calibration and electrode data.
LIGHT. Press to activate backlit display.
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Instruction Manual PD 300
3 PREPARATION
3.1 Inserting 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 and secure into place using the two
screws removed earlier.
Figure 3: Back panel of meter showing meter compartment
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Instruction Manual PD 300
3.2 Probe Information
Your meter includes two probes:
•pH electrode with BNC connector.
•DO/temperature probe with a notched 6-pin connector
The temperature sensing element built into the DO probe will also compensate for pH
readings as long as both probes are in your solution at the same time.
You can use any standard pH electrode with a BNC connector with this meter. DO 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.
If you want to use a “3-in-1” pH probe with a built-in temperature element, or if you want to use
a separate temperature probe, you will need to disconnect the DO probe to allow for
connection of the separate temperature sensor.
NOTE: Keep connectors 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 counterclockwise. While holding
onto the metal part of the connector, pull it away from the meter.
See Figure 4.
CAUTION: Do not pull on the probe cord or the probe wires may be damaged.
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Instruction Manual PD 300
To connect the DO/ 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 turn the metal locking ring clockwise to
lock the probe connector into place. See Figure 4.
2. To remove probe, unscrew the metal locking ring by turning the ring counterclockwise
and slide up the probe connector. While holding onto metal sleeve, pull probe away from
the meter.
NOTE
Do not substitute other DO probes. For a replacement DO probe, see the “Accessories”
section. Follow the same directions to connect an optional separate temperature element.
CAUTION: Do not pull on the probe cord or the probe wires may be damaged.
Figure 4: Connecting pH and DO/temperature probes
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Instruction Manual PD 300
4 CALIBRATION
4.1 Important Information on Meter Calibration
When you recalibrate your meter, old calibration points are replaced on a “point by point” basis
in pH and completely for % saturation and mg/L (ppm).
For example:
•pH: if you previously calibrated your meter at pH 4.01, 7.00 and 10.01, and you
recalibrate at pH 7.00, the meter retains the old calibration data at pH 4.01 and pH 10.01.
•% saturation and mg/L (ppm): all new calibrations automatically override existing
calibration data.
To view current calibration points:
•pH: Program 1.0 in the SETUP section, page 30.
•% saturation: Program 3.0 in the SETUP section: page 41.
•mg/L (ppm): Program 2.0 in the SETUP section, page 41.
To completely recalibrate your meter, or when you use replacement probes, it is best to clear
old calibration data by resetting the meter.
To reset the meter to its factory defaults:
•pH: Program 4.0 in the SETUP section, page 36.
•% saturation: Program 7.0 in the SETUP section: page 49.
•mg/L (ppm): Program 6.0 in the SETUP section, page 49.
NOTE
Resetting the meter will set meter to factory defaults. pH, % saturation and mg/L (ppm) must
be reset separately.
For directions on how to calibrate your meter:
See section 4.2 for Temperature Calibration
See sections 4.3 for pH calibration.
See section 4.5 for % saturation calibration
See sections 4.6 for mg/L (ppm) calibration
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Instruction Manual PD 300
4.2 Temperature Calibration
The temperature sensor of the the DO probe is factory
calibrated. Calibrate your sensor only if you suspect
temperature errors that may have occurred over a long
period of time or if you have a replacement probe. Make sure
the DO probe is attached prior to performing the calibration.
1. Switch the meter on. Press MODE to select either pH or
mg/L (ppm) measurement mode.
2. Press the CAL/MEAS key to enter pH or mg/L (ppm)
calibration mode. The CAL indicator will appear above the
primary display.
3. While in pH or mg/L (ppm) calibration mode, press the
MODE key to enter temperature calibration mode. The
primary display shows the temperature reading and the
secondary display shows you the factory default
temperature value.
4. Compare the primary display reading to a NIST-
traceable thermometer or another thermometer known
to be accurate.
5. Press the ▲or ▼keys to adjust the primary display
reading to agree with your temperature standard.
6. Press the ENTER key to confirm temperature calibration
and return to Measurement mode.
NOTE
•To exit from Temperature Calibration mode without
confirming calibration, DO NOT press ENTER in Step 6.
Press CAL/MEAS instead.
•If a separate temperature probe is used for pH
measurement (EC-PHWPTEMP-01W / 35618-05), then
temperature calibration done for pH is separate and
independent from mg/L measurement mode.
•Temperature calibration is restricted to ± 5°C from the
factory default value displayed during calibration
(shown in the secondary display).
(The values shown above are for illustration purpose. Your meter may display
different values depending on the settings & your environmental conditions)
Figure 5: Temperature calibration
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Instruction Manual PD 300
4.3 pH calibration
Before starting calibration, make sure you are in pH measurement mode.
NOTE
We recommend calibration with at least two calibration standards that bracket (one
above and one below) the expected sample range. One point calibration is possible as
long as the chosen buffer is close to the expected sample value.
When you re-calibrate your meter, old calibration points are replaced on a “point-by-point”
basis. For example:
•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.
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.
The meter automatically recognises and calibrates to these standard buffer values, which
makes pH calibration faster and easier.
Be sure to remove the protective electrode storage bottle or rubber cap of the electrode
before calibration or measurement. If the electrode has been stored dry, hydrate the
electrode in electrode storage solution or tap water for 10 minutes before calibrating or taking
readings to saturate the pH electrode surface and minimise drift.
Rinse your electrode in deionised water after use, and store in electrode storage solution. If
storage solution is not available, use fresh pH 4.01 or 7.00 buffer solution for short term
storage.
Do not reuse buffer solutions after calibration. Contaminants in the solution can affect the
calibration and eventually the accuracy of the measurements. See Accessories for information
on pH buffer solutions.
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Instruction Manual PD 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 probe thoroughly with de-ionised
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 DO electrode. For
temperature compensated readings, dip the DO
electrode 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 stabilise.
See Figure 5.
6. Press ENTER to confirm calibration. The
meter is now calibrated to the current buffer.
The lower display scrolls through the
remaining buffer options.
•For multi-point calibration, go to step 7.
•For one-point calibration, go to step 9.
Figure 6: pH Calibration
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Instruction Manual PD 300
7. Rinse the electrode with deionised 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 7.
9. When calibration is complete, press
CAL/MEAS to return to pH measurement mode.
NOTE
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 8.
Figure 7: Next point calibration for
pH 4.01
To limit the number of pH buffer values available during
calibration, see Setup Section 8.4 P3.2: Selecting
number of pH calibration points on page 34.
Figure 8: Err message and
electrode icon will appear if
incorrect buffer is used
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Instruction Manual PD 300
4.4 Dissolved Oxygen Calibration
Before calibrating your meter, make sure to rinse the probe well with de-ionised water or rinse
solution.
NOTE
Do not let membrane surface of the probe touch any
other surface. The probe guard (the piece with holes
fitted over the end of the probe) protects the membrane;
make sure this is always attached to the probe while it
is in use. See Figure 9.
You can calibrate for dissolved oxygen in either %
saturation or mg/L (ppm). All new calibrations
automatically override existing DO calibration data.
Figure 9: DO Probe guard
Before Calibration
Before starting calibration, make sure you are in the correct measurement mode. When you
switch on the meter, the meter starts up in the units last used (either pH, mg/L (ppm) or % air
saturation). For example, if you shut off the meter in “mg/L” units, the meter will read “mg/L”
units when you switch the meter on.
NOTE
Most users will calibrate to 100% saturation even when working in mg/L. When calibrating the
meter in mg/L mode, you can make fine adjustments, typically to a mid-range value between
10 and 100%. If you are calibrating to a mid-range value, you need to set the 100% saturation
value first.
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Instruction Manual PD 300
4.5 Dissolved Oxygen Calibration in % Saturation
You can calibrate this meter quickly and easily in air. The exact calibration value depends on
barometric pressure. The meter is set to a factory default of 760 mm Hg, which results in a
calibration value of 100% saturation in air.
NOTE
If the barometric pressure setting has been changed from 760 mm Hg, the calibration value in
air will automatically adjust to a value other than 100%. The adjusted value will be correct for
the new barometric pressure setting.
See Section 8.6.1 on page 37 to change the pressure setting. See Addendum 2 on page 67
for a table of adjusted % saturation values.
To calibrate 100% Saturation:
1. Rinse the probe well with deionised rinse water. Do not touch
the membrane.
2. Press the MODE key to select the % saturation mode.
3. Press the CAL key. The CAL indicator will appear above the
primary display. The primary display shows the current value
of the measurement and the secondary display will show
100.0. See figure on right and NOTE above.
4. Hold the probe in the air. Wait for the reading to stabilise. If
the READY indicator feature is enabled, it will appear when
the reading is stable. (See page 45 for Ready indicator
setup.)
5. Press the ENTER key. The meter automatically calibrates to
100.0% air saturation and returns to Measurement mode.
NOTE
Whenever an error occurs during calibration, the ERR indicator
appears in the lower left hand corner of the display.
You can offset your % DO calibration. See page 40 for directions.
Figure 10: To calibrate for
100% saturation
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Instruction Manual PD 300
To calibrate 0% Saturation:
MEAS
%
%
%
ATC
°C
ATC
°C
128.5
23.4
CAL
MEAS
READY
23.4
ENTER
CAL
MEAS
READY
1. Rinse the probe well with deionised rinse water. Do not
touch the membrane.
2. Press the MODE key to select the % saturation mode.
3. Place the probe in zero oxygen solution. Stir the probe
gently to homogenise the sample. Make sure that the
sample is continuously flowing past the membrane sensor.
4. Press the CAL key. The CAL indicator will appear above
the primary display. The primary display shows the current
value of the measurement and the secondary display will
show 0.0.
5. Wait for the reading to stabilise. If the READY indicator
feature is enabled, it will appear when the reading is stable.
(See page 45 for Ready indicator setup.)
6. Press the ENTER key. The meter automatically calibrates
to 0.0% air saturation and returns to Measurement mode.
See figure on right.
NOTE
The reading in the primary display in step 3 must read at 10% or
under for the calibration to work correctly. Whenever an error occurs during calibration, the
ERR indicator appears in the lower left hand corner of the display.
Figure 11: To calibrate for
0% saturation
You can offset your % DO Calibration; see page 40 for directions.
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Instruction Manual PD 300
4.6 Dissolved Oxygen Calibration in mg/L (ppm) mode
Calibrating the meter to 100% in saturation mode will also calibrate the mg/L mode at the
value in mg/L corresponding to 100% saturation. This should produce acceptable results in
most applications.
This meter also lets you make a calibration adjustment in mg/L (ppm) mode without affecting
your % saturation calibration. To select between mg/L and ppm units, see page 46.
NOTES ON MG/L (PPM) MODE CALIBRATION
•During mg/L (ppm) measurement and calibration, the meter adjusts to the
barometric pressure value that is programmed into the meter. It also adjusts to
the salinity value that is programmed into the meter.
•You can change the barometric pressure value and salinity value in the mg/L
(ppm) SETUP mode (see Section 8.6 -- P1.0 (dPr): Dissolved Oxygen
Parameters) for directions).
•Whenever an error occurs during calibration, the ERR indicator appears in the
lower left hand corner of the display.
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