TPS Aqua-DP User manual

Congratulations !
You have purchased the latest in Handheld Dissolved Oxygen-pH-mV-
Temperature instrumentation. We trust that your new Aqua-DP will give
you many years of reliable service.
The Aqua-DP is a breeze to operate. This manual has been designed to
help you get started, and also contains some handy application tips. If at
any stage you require assistance, please contact either your local TPS
representative or the TPS factory in Brisbane.
The manual is divided into the following sections:
1. Table of Contents
Each major section of the handbook is clearly listed. Sub-sections
have also been included to enable you to find the information you
need at a glance.
2. Introduction
The introduction has a diagram and explanation of the display and
controls of the Aqua-DP. It also contains a full listing of all of the
items that you should have received with your Aqua-DP. Please take
the time to read this section, as it explains some of items that are
mentioned in subsequent sections.
3. Main Section
The main section of the handbook provides complete details of the
Aqua-DP, including operating modes, calibration, troubleshooting,
specifications, and warranty terms.
4. Appendices
Appendices containing background information and application notes
are provided at the back of this manual.
Model Aqua-DP
Dissolved Oxygen -
pH –mV - Temp. Meter
Version : 1.3
Date : 01/12/2010

Page 2
TPS Pty Ltd
ABN 30 009 773 371
Unit 6 / 253 Leitchs Road
Brendale, QLD,
Australia, 4500
Phone : [phone]
International : 61 7 32 058 027
Fax : [phone]
International : 61 7 3808 4871
Email : [email protected]
Web : www.tps.com.au

Page 3
Contents
1. Introduction.................................................................................................. 4
1.1 Aqua-DP Display and Controls..........................................................................4
1.2 Unpacking Information.......................................................................................6
1.3 Specifications ....................................................................................................7
2. Operating Modes.......................................................................................... 9
2.1 Selecting the Desired Combination of Parameters............................................9
2.2 Selecting the Desired Operating Mode............................................................10
3. Dissolved Oxygen Calibration.................................................................. 12
3.1 Calibration .......................................................................................................12
3.2 Dissolved Oxygen Calibration Notes...............................................................13
3.3 Dissolved Oxygen Calibration Messages ........................................................14
4. pH Calibration ............................................................................................ 15
4.1 Calibration .......................................................................................................15
4.2 pH Calibration Notes .......................................................................................17
4.3 pH Calibration Messages.................................................................................18
5. Millivolt Calibration.................................................................................... 19
5.1 Calibration .......................................................................................................19
5.2 Millivolt Calibration Notes ................................................................................21
5.3 Millivolt Calibration Messages .........................................................................21
6. Temperature Calibration ........................................................................... 22
6.1 Calibration .......................................................................................................22
6.2 Calibration Notes.............................................................................................22
6.3 Calibration Messages......................................................................................23
6.4 Manual Temperature Setting...........................................................................23
7. Setting the Salinity Correction Value....................................................... 24
8. Selecting Buffers for Auto Buffer Recognition....................................... 25
9. Battery......................................................................................................... 26
9.1 Battery Saver Function....................................................................................26
9.2 Changing the Battery.......................................................................................27
10. Initialising the Aqua-DP......................................................................... 28
11. Troubleshooting..................................................................................... 29
11.1 General Error Messages..................................................................................29
11.2 Dissolved Oxygen Troubleshooting.................................................................30
11.3 pH Troubleshooting .........................................................................................31
11.4 ORP Troubleshooting......................................................................................33
11.5 Temperature Troubleshooting .........................................................................33
12. Appendices............................................................................................. 34
12.1 Dissolved Oxygen Sensor Fundamentals........................................................34
12.2 pH Sensor Fundamentals................................................................................39
12.3 Instrument software version number. ..............................................................41
13. Warranty.................................................................................................. 42
14. Sensor manual

Page 4
1. Introduction
1.1 Aqua-DP Display and Controls

Page 5
Display
24 character alpha-numeric display. Can show any of the following
combinations readouts simultaneously (see section 2).
DO2+ pH + Temp
DO2+ mV + Temp
DO2+ Temp
pH + Temperature
mV + Temperature
Temperature only
Salinity Correction
Setting
A unique “Large Digit” mode nearly doubles the size of the digits
(section 2).
User-friendly prompts and error messages are also provided.

Used to calibrate all parameters. See sections 3, 4, 5 and 6.
Also used to select pH buffers for automatic pH buffer recognition.
See section 8.

Hold this key for 2 seconds to toggle between % Saturation and ppM
(mg/L) Dissolved Oxygen modes. See section 2.

Switches the Aqua-DP on and off.
Hold this key for 3 seconds to invoke Battery Saver mode. See
section 9.
and 
These keys toggle the Aqua-DP between Large Display mode and
Dual Display mode. See section 2.
NOTE: The digits in Large Display mode are made by combining the
two rows of the display. This results in a small gap
approximately half way up the digits.

Page 6
1.2 Unpacking Information
Before using your new Aqua-DP, please check that the following
accessories have been included: Part No
1. Aqua-DP Dissolved Oxygen-Temperature Instrument 123143/1
123143/3
123143/5
2. Oxygen sensor.......................................................................123400
3. Oxygen sensor cable: (see cable label for part No) 1, 3 or 5m cable
4. Membrane kit for oxygen sensor............................................123301
5. pH Sensor:..........(see cable label for part No) 1, 3 or 5m cable
6. pH7.00 Buffer, 200mL............................................................121387
7. pH4.01 Buffer, 200mL............................................................121381
8. Manual
Options that may have been ordered with your Aqua-DP:
1. Extended cable (ordered by the metre)..................................130040
2. Aluminium Carry Case...........................................................130057

Page 7
1.3 Specifications
Ranges
Resolution
Accuracy
Dissolved
Oxygen
0 to 250.0 % Saturation
0 to 25.0 ppM
0.1 % Saturation
0.1 ppM
±0.3 % Saturation
±0.1 ppM
pH
0 to 14.00 pH
0.01 pH
±0.01 pH
mV
0 to ±999 mV
1 mV
±1 mV
Temperature
-10.0 to 120.0 OC
(Dissolved Oxygen
sensor limited to 45 OC)
0.1 OC
±0.2 OC
Additional Dissolved Oxygen Specifications
Temperature Compensation.............. Dual automatic system for:
1. Membrane permeability
2. Solubility in ppM mode
Sensor Zero Range........................... 0 to 7%
Sensor Span Range.......................... 70.0 to 135.0%
Calibration......................................... One-touch automatic calibration in
Zero and in Air.
Additional pH Specifications
Temperature Compensation.............. Automatic, 0 to 50.0 OC
pH Input Impedance.......................... >3 x 1012 
pH Asymmetry Range....................... -1.00 to 1.00 pH
pH Slope Range................................ 85.0 to 105.0%
Auto pH Buffer Recognition............... pH4.01, pH6.86, pH7.00 pH9.18,
pH10.01
Additional mV Specifications
Temperature Compensation.............. Not applicable for mV
ORP Input Impedance....................... >3 x 1012 
ORP Asymmetry Range.................... -60 mV to +60 mV
Auto Standard Recognition................ +229mV (ZoBell Solution)

Page 8
Additional Temperature Specifications
Temperature Sensor Offset Range....-10.0oC to +10.0oC
General Specifications
Display...............................................24 Character alphanumeric LCD,
with full text prompts and error
messages.
Power ................................................9V Alkaline Battery for 70 hours
operation.
Battery Saver.....................................On : Auto switch-off after 5
minutes
Off : Continuous use
Dimensions........................................165 x 85 x 35 mm
Mass..................................................Instrument only : Approx 280g
Full Kit : Approx 2.0kg
Environment ......................................Temperature : 0 to 45 OC
Humidity : 0 to 95 % R.H.

Page 9
2. Operating Modes
2.1 Selecting the Desired Combination of Parameters
The Aqua-DP can display Dissolved Oxygen readings in units of ppM
(mg/L) or % Saturation. Additionally, it can display either pH or mV.
To select which combination of these two parameters to display…
1. Press and hold for 2 seconds.
2. The Mode menu is now displayed, for example…
Mode : pH +
%Sat Oxy 
Press the or keys repeatedly to select the desired
combination of…
pH + % Saturation Dissolved Oxygen
pH + ppM (mg/L) Dissolved Oxygen
mV + % Saturation Dissolved Oxygen
mV + ppM (mg/L) Dissolved Oxygen
3. Press to save the selection and return to normal display.

Page 10
2.2 Selecting the Desired Operating Mode
Once the desired combination has been selected, press the key to
select the desired operating mode. The sequence is shown in the
following table…
Dissolved Oxygen, pH/mV & Temperature Mode
100.0%Sat
7.00
25.0
Dissolved Oxygen data is shown on the top, pH or mV data is shown on the
bottom left and Temperature is shown on the bottom right.
Calibration is not available in this mode.
Large digit readout is not available in this mode.

Dissolved Oxygen Mode
100.0%Sat
25.0
Dissolved Oxygen data is shown on the top line and Temperature data is
shown on the bottom line.
Select this mode to calibrate Dissolved Oxygen.
The “S” is shown after the “ppM” units when the Salinity correction value is
set to greater than 0.0ppK (see section 7).
Press or to toggle between dual readout or large digit readout.

pH or mV Mode
7.00pH
25.0
pH or mV data is shown on the top line and Temperature data is shown on
the bottom line.
Select this mode to calibrate pH or mV.
Press or to toggle between dual readout or large digit readout.

Continued over the page…

Page 11
Mode selection, continued…
Temperature Mode
25.0
Temperature data only is shown on the top line.
Select this mode to calibrate Temperature.
Press or to toggle between regular readout or large digit readout.

Salinity Correction Setting Mode
36.0ppK
The Salinity Correction setting is shown on the top line.
Select this mode to set the Salinity Correction value to the salinity of the
sample to be measured. This setting is only applicable to ppM (mg/L)
Dissolved Oxygen readout. See section 7.
Press or to toggle between regular readout or large digit readout.

Back to Dissolved Oxygen, pH/mV & Temperature mode
Note: The decimal point is replaced by a ” “ if a Dissolved Oxygen, pH,
mV or Temperature calibration has failed (see sections 3, 4, 5 and
6), if the unit is initialised (see section 10), or if the unit has lost its
factory calibration (see section 11.1).

Page 12
3. Dissolved Oxygen Calibration
A “ ” in place of the decimal point indicates that the Dissolved Oxygen
readout is not calibrated, or a past calibration has failed. The “ ” will be
removed once an Air calibration has been successfully performed.
3.1 Calibration
1. Switch the Aqua-DP on.
2. Select the desired % Saturation or ppM Mode (see section 2). Each
mode should be calibrated separately for optimum accuracy.
3. Plug the Dissolved Oxygen sensor into the sensor socket.
4. Ensure that temperature has already been calibrated (see section 5).
NOTE: If the decimal point in the temperature reading is replaced by
a “ “, then the temperature readout is not calibrated.
5. Rinse the Dissolved Oxygen sensor in distilled water and blot dry.
6. Zero Calibration
(a) Place the sensor into an oxygen-free solution. This solution may
be prepared by dissolving 2g of Sodium Sulphite in 100mL of
distilled water. A 50g bottle of Sodium Sulphite powder is
supplied with a new Dissolved Oxygen sensor for this purpose
(part number 123302).
(b) Allow the reading to stabilise at or near zero. This may take 2-3
minutes.
(c) Press and hold the key for 2 seconds to calibrate.
(d) Discard the oxygen-free solution after use.
(e) A “ “ will not be removed from the display after a Zero
Calibration.
7. Rinse the Dissolved Oxygen sensor in distilled water and blot dry.

Page 13
8. Air Calibration
(a) Hang the Dissolved Oxygen sensor in air. The tip of the sensor
should be pointing downwards.
(b) Allow the reading to stabilise. After a zero calibration, this may
take up to 5 minutes.
(c) Press and hold the key for 2 seconds to calibrate.
(d) A “ “ in the display will be replaced by a decimal point after a
successful air calibration.
9. The Aqua-DP is now calibrated for Dissolved Oxygen and is ready
for use in the mode that was selected during calibration.
NOTES:
When taking sample measurements, always ensure that there is
adequate flow of solution past the membrane for accurate, stable
readings. See section 12.1.6.
If salinity-corrected ppM Dissolved Oxygen readings are required, set
the salinity correction value before taking sample measurements.
See section 7.
3.2 Dissolved Oxygen Calibration Notes
1. A zero calibration should be performed at least monthly. In
applications where there is a low level of dissolved oxygen, a zero
calibration may have to be done weekly.
2. An air calibration should be performed at least weekly. Of course,
more frequent calibration will result in greater confidence in results.
3. All calibration information is retained in memory when the Aqua-DP
is switched off, even when the battery is removed.
4. The salinity correction value is ignored during zero and air calibration.
There is therefore no need to re-set the salinity correction value when
calibrating Dissolved Oxygen.

Page 14
3.3 Dissolved Oxygen Calibration Messages
1. If a zero calibration has been successfully performed, the Aqua-DP
will display the following message, and then display the zero
response of the sensor.
Cal. OK
Zero= 1.0%
2. If a zero calibration has failed, the Aqua-DP will display the following
message, then the failed zero value of the sensor.
Cal. Failed
Zero= 10.0%
3. If an air calibration has been successfully performed, the Aqua-DP
will display the following message, and then the span value of the
sensor.
Cal. OK
Span=100.0%
4. If an air calibration has failed, the Aqua-DP will display the following
message, and then the failed span value of the sensor.
Cal. Failed
Span= 70.0%

Page 15
4. pH Calibration
A “ ” in place of the decimal point indicates that the pH readout is not
calibrated, or a past calibration has failed. The “ ” will be removed once
a full two-point pH calibration has been successfully performed.
4.1 Calibration
1. Switch the Aqua-DP on.
2. Select pH Mode (see section 2).
3. Plug the pH sensor into the BNC socket (this is the metal socket). For
automatic temperature compensation, plug the Dissolved Oxygen
sensor into the Dissolved Oxygen socket (this is the 6-pin plastic
socket). If the Dissolved Oxygen sensor is not connected, then the
Aqua-DP will use manual temperature compensation.
4. Ensure that temperature has already been calibrated, or manually set
(see sections 6.1 and 6.4). NOTE: If the decimal point in the
temperature reading is replaced by a “ “, then the temperature
readout is not calibrated.
5. Remove the wetting cap from the pH sensor.
6. Rinse the pH sensor in distilled water and blot dry.
7. Ensure that you are using the buffers which have been selected for
automatic buffer recognition. See section 8 for a detailed explanation.
8. Place the pH sensor into a small sample of pH7.00 (or pH6.86)
buffer, so that the bulb and reference junction are both covered. See
the diagram over the page. The Dissolved Oxygen sensor can be
placed into the same sample, or a separate beaker of water that is at
the same temperature as the buffer.

Page 16
DO NOT place the sensor(s) directly into the buffer bottle. Discard
the used buffer after use.
9. When the reading has stabilised, press and hold the key for 2
seconds to calibrate. If a 1 point calibration has been performed, a ““
will not be removed until a full 2 point calibration has been performed.
10. Rinse the pH sensor in distilled water and blot dry.
11. Place the pH sensor into a small sample of pH4.01, pH9.18 or
pH10.01 Buffer, so that the bulb and reference junction are both
covered, as per the diagram in step 8. DO NOT place the sensor
directly into the buffer bottle. Discard the used buffer after use.
pH9.18 and pH10.01 buffers are unstable once the bottles have
been opened. Discard immediately after use.
12. When the reading has stabilised, press and hold the key for 2
seconds to calibrate. The “ “ will now be replaced by a decimal
point, if calibration was successful.
13. The Aqua-DP is calibrated for pH and is ready for use in this mode.

Page 17
4.2 pH Calibration Notes
1. A 1-point calibration should be performed at least weekly. In
applications where the sensor junction can become blocked, such as
dairy products, mining slurries etc, a 1-point calibration may have to
be done daily.
2. A full 2-point calibration should be performed at least monthly. Of
course, more frequent calibration will result in greater confidence in
results.
3. All calibration information is retained in memory when the Aqua-DP
is switched off, even when the battery is removed.
4. The Aqua-DP displays the value of the pH buffer that it has
attempted to recognise at calibration. Ensure that the buffer value
displayed corresponds to the buffer that you are using.

Page 18
4.3 pH Calibration Messages
1. If a 1-point calibration has been successfully performed, the
Aqua-DP will display the following message, and then display the
asymmetry and slope of the sensor. If the meter has not been
calibrated at two points at this stage, the slope is set to 100.0%.
1 point 7.00
Cal. OK
then:
Asym= 0.10pH
Slope=100.0%
2. If a 1-point calibration has failed, the Aqua-DP will display the
following message, then the failed asymmetry value of the sensor.
1 point 7.00
Cal. Failed
then:
Asym= 1.50pH
3. If a 2-point calibration has been successfully performed, the
Aqua-DP will display the following message, and then the asymmetry
and slope of the sensor.
2 point 4.01
Cal. OK
then:
Asym= 0.10pH
Slope= 99.5%
4. If a 2-point calibration has failed, the Aqua-DP will display the
following message, and then the failed slope value of the sensor.
2 point 4.01
Cal. Failed
then:
Slope= 70.0%

Page 19
5. Millivolt Calibration
This calibration procedure is only applicable for calibrating a Redox
sensor in +229mV ZoBell solution.
A “ ” in place of the decimal point indicates that the mV readout is not
calibrated, or a past calibration has failed. The “ ” will be removed once
a one-point mV calibration has been successfully performed.
5.1 Calibration
1. Switch the Aqua-DP on.
2. Select mV Mode (see section 2).
3. Plug the ORP sensor into the BNC socket (this is the metal socket).
Automatic temperature compensation is not applicable to mV mode,
so it is not necessary to connect the Dissolved Oxygen sensor.
4. Remove the wetting cap from the ORP sensor.
5. Rinse the ORP sensor in distilled water and blot dry.
6. Ensure that you are using the buffers which have been selected for
automatic buffer recognition. See section 8 for a detailed explanation.
7. ZoBell Redox standard can be made with a 1:1 mixture of Part A and
Part B. 10mL of each should suffice. This solution produces +229mV
of Redox potential. Caution: ZoBell solution is poisonous and
should be handled with care.

Page 20
8. Place the sensor into ZoBell solution so that the platinum tip and
reference junction are both covered as per the diagram below.
Discard the used standard after use.
9. When the reading has stabilised, press and hold the key for 2
seconds to calibrate. The “ “ will now be replaced by a decimal
point, if calibration was successful.
10. The Aqua-DP is calibrated for mV and is ready for use in this mode.