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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
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Table of Contents
Troubleshooting
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Summary of Contents for TPS Aqua-DP
- Page 1 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.
- Page 2 Page 2 TPS Pty Ltd ABN 30 009 773 371 Unit 6 / 253 Leitchs Road Brendale, QLD, Australia, 4500 Phone : (07) 32 058 027 International : 61 7 32 058 027 : (07) 3808 4871 International : 61 7 3808 4871 Email : tps@tps.com.au...
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Page 3: Table Of Contents
Page 3 Contents Introduction ....................4 Aqua-DP Display and Controls ................4 Unpacking Information ..................6 Specifications ....................7 Operating Modes ..................9 Selecting the Desired Combination of Parameters ..........9 Selecting the Desired Operating Mode ............10 Dissolved Oxygen Calibration ..............12 Calibration ....................... -
Page 4: Introduction
Page 4 1. Introduction 1.1 Aqua-DP Display and Controls... - Page 5 Hold this key for 3 seconds to invoke Battery Saver mode. See section 9. 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.
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Page 6: Unpacking Information
Page 6 1.2 Unpacking Information Before using your new Aqua-DP, please check that the following accessories have been included: Part No Aqua-DP Dissolved Oxygen-Temperature Instrument 123143/1 123143/3 123143/5 Oxygen sensor ............... 123400 Oxygen sensor cable: 1, 3 or 5m cable (see cable label for part No) Membrane kit for oxygen sensor .......... -
Page 7: Specifications
Page 7 1.3 Specifications Ranges Resolution Accuracy Dissolved 0 to 250.0 % Saturation 0.1 % Saturation ±0.3 % Saturation Oxygen 0 to 25.0 ppM 0.1 ppM ±0.1 ppM 0 to 14.00 pH 0.01 pH ±0.01 pH 0 to ±999 mV 1 mV ±1 mV Temperature... - Page 8 Page 8 Additional Temperature Specifications Temperature Sensor Offset Range ..-10.0 C to +10.0 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...
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Page 9: Operating Modes
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…... -
Page 10: Selecting The Desired Operating Mode
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… 100.0%Sat Dissolved Oxygen, pH/mV & Temperature Mode 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. - Page 11 Page 11 Mode selection, continued… 25.0 Temperature Mode Temperature data only is shown on the top line. Select this mode to calibrate Temperature. Press to toggle between regular readout or large digit readout. 36.0ppK Salinity Correction Setting Mode 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.
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Page 12: Dissolved Oxygen Calibration
The “ ” will be removed once an Air calibration has been successfully performed. 3.1 Calibration Switch the Aqua-DP on. Select the desired % Saturation or ppM Mode (see section 2). Each mode should be calibrated separately for optimum accuracy. -
Page 13: Dissolved Oxygen Calibration Notes
(d) A “ “ in the display will be replaced by a decimal point after a successful air calibration. The Aqua-DP is now calibrated for Dissolved Oxygen and is ready for use in the mode that was selected during calibration. -
Page 14: Dissolved Oxygen Calibration Messages
Cal. OK Zero= 1.0% 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%... -
Page 15: Ph Calibration
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. 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 “... - Page 16 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.
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Page 17: Ph Calibration Notes
All calibration information is retained in memory when the Aqua-DP is switched off, even when the battery is removed. The Aqua-DP displays the value of the pH buffer that it has attempted to recognise at calibration. Ensure that the buffer value... -
Page 18: Ph Calibration Messages
100.0%. 1 point 7.00 Asym= 0.10pH then: Cal. OK Slope=100.0% 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 Asym= 1.50pH then: Cal. Failed... -
Page 19: Millivolt Calibration
The “ ” will be removed once a one-point mV calibration has been successfully performed. 5.1 Calibration Switch the Aqua-DP on. Select mV Mode (see section 2). Plug the ORP sensor into the BNC socket (this is the metal socket). - Page 20 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.
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Page 21: Millivolt Calibration Notes
1-point calibration may have to be done daily. All calibration information is retained in memory when the Aqua-DP is switched off, even when the battery is removed. 5.3 Millivolt Calibration Messages If calibration has been successfully performed, the Aqua-DP will display the following message, and the offset of the sensor. -
Page 22: Temperature Calibration
The “ ” will be removed once Temperature has been successfully calibrated. 6.1 Calibration Switch the Aqua-DP on. Select Temperature mode (see section 2). Plug the Dissolved Oxygen sensor into the sensor socket. -
Page 23: Calibration Messages
Page 23 6.3 Calibration Messages If a temperature calibration has been successfully performed, the Aqua-DP will display the offset value of the sensor. For example… Cal. OK Offset=1.0 If a temperature calibration has failed, the Aqua-DP will display the failed offset value of the sensor. -
Page 24: Setting The Salinity Correction Value
Dissolved Oxygen readings. To set the salinity correction value: Measure the salinity of the sample solution. For best results, use a good quality salinity meter, such as a TPS model Aqua-C or WP-84. Note the reading. Switch the Aqua-DP on. -
Page 25: Selecting Buffers For Auto Buffer Recognition
Page 25 8. Selecting Buffers for Auto Buffer Recognition The Aqua-DP is factory set to automatically recognise pH4.01, pH7.00 and pH9.18 buffers. However, some users may prefer to use pH6.86 instead of pH7.00 and pH10.01 instead of pH9.18. The following procedure describes how to set which of these buffers are automatically recognised at calibration. -
Page 26: Battery
9. Battery 9.1 Battery Saver Function The Aqua-DP is equipped with a battery saver function. If no button has been pressed for five minutes, the unit beeps and flashes the display for 20 seconds, and then shuts off. This function can be disabled for continuous use. -
Page 27: Changing The Battery
Page 27 9.2 Changing the Battery Turn the instrument over and locate the 2 battery cover screws on the rear. See the diagram below. Raise the fold out stand (so it is out of the way) and then fully loosen both screws. -
Page 28: Initialising The Aqua-Dp
Page 28 10. Initialising the Aqua-DP If the calibration settings of the Aqua-DP exceed the allowable limits, and the unit cannot be re-calibrated, then it may need to be initialised to factory default values. This action may be required if an sensor is replaced. -
Page 29: Troubleshooting
Possible Causes Remedy Message Factory The EEPROM chip which The unit must be returned to Cal. Fail contains the factory TPS for service. calibration information has failed. Handbook Memory User calibration settings Re-calibrate the instrument. Failed have been lost or corrupted. -
Page 30: Dissolved Oxygen Troubleshooting
5. Sensor is faulty. Return sensor to factory for repair or replacement Blackened Silver Sensor has been exposed to Return to the TPS factory for anode sulphides or other chemical cleaning and service. poisoning. Tarnished or Sensor has been chemically... -
Page 31: Ph Troubleshooting
2 Point calibration 1. Incorrect primary buffer. Ensure that you are using fails (Slope is less the buffers which the Aqua-DP has been set to than 85.0%). automatically recognise (See section 8). 2. Glass bulb not clean. Clean glass bulb as per instructions supplied with the sensor. - Page 32 Page 32 pH Troubleshooting, continued... Unstable 1. Reference junction Clean reference junction, as readings. blocked. per instructions supplied with the sensor. 2. Glass bulb not clean. Clean glass bulb as per instructions supplied with the sensor. 3. Bubble in glass bulb. Flick the sensor to remove bubble.
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Page 33: Orp Troubleshooting
Page 33 11.4 ORP Troubleshooting Symptom Possible Causes Remedy Unit fails to Calibration settings outside Initialise the unit. See calibrate, even of allowable limits due to section 10. with new sensor. previous failed calibration. Calibration fails 1. Reference junction Clean reference junction, as (Zero is outside blocked. -
Page 34: Appendices
Page 34 12. Appendices 12.1 Dissolved Oxygen Sensor Fundamentals The sensor used is the amperometric type of Clark Sensor and is suitable for the measurement of oxygen pressures in the range 0 to 100 cm of mercury. While the sensor actually reads partial pressure of oxygen, the circuit is calibrated to be read in percentage saturation or parts per million (Milligrams/litre). - Page 35 Page 35 12.1.2 Maintenance Of The Membrane The membrane does not require replacement as long as it remains intact. If punctured or suspected of leaking around the edges, it must be replaced. Oils, fats or other greasy build-ups will reduce the sensitivity of the sensor, eventually making it fail to calibrate.
- Page 36 Page 36 12.1.4 Notes On Units Of Dissolved Oxygen The terms "Oxygen Concentration" and "Oxygen Partial Pressure" frequently give rise to some confusion. Oxygen Concentration is the absolute quantity of oxygen present per unit mass of the liquid. Oxygen Partial Pressure is the oxygen fraction of the total pressure of all of the gases present.
- Page 37 (a) Membrane correction is achieved AUTOMATICALLY ; (b) To provide the mass units (ppM) readout (so popular due to the Winkler process used in the past), the Aqua-DP Meter has Solubility Correction via an additional temperature sensor in the sensor ;...
- Page 38 Page 38 12.1.6 Velocity Past The Membrane Workers have shown that the relationship between the diffusion current (oxygen current) and the external velocity of the liquid is expotential. Some workers using thicker membranes have shown even less dependence of the diffusion current on liquid velocity. Because of the exponential nature of the relationship, considerable changes in velocity have to be made before noticing any change in the diffusing current once the flow is sufficiently high.
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Page 39: Ph Sensor Fundamentals
Page 39 12.2 pH Sensor Fundamentals A combination pH sensor is two sensors in one. The sensing membrane is the round or spear shaped bulb at the tip of the sensor. This produces a voltage that changes with the pH of the Solution. This voltage is measured with respect to the second part of the sensor, the reference section. - Page 40 Page 40 12.2.2 The Slope of a pH Sensor As mentioned above, a pH sensor produces 0 mV output at around 7.00 pH. As the pH goes up, an “ideal” pH sensor produces -59mV/pH unit at C As the pH goes down, an ideal pH sensor produces +59mV/pH unit.
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Page 41: Instrument Software Version Number
Figure 12-3 12.3 Instrument software version number. If you need to phone or fax TPS for any further technical assistance, the version number of your Aqua-DP firmware may of benefit to us. Please obtain the version number before phoning or faxing. -
Page 42: Warranty
Please read service details on our ‘Service’ web page first: http://www.tps.com.au/service.htm TPS Pty Ltd has a reputation for prompt and efficient service. If you feel that this equipment is in need of repair, please re-read the manual. Sometimes, instruments are received for "repair" in perfect working order. - Page 43 Page 43 Please check that the following is enclosed with your equipment: A TPS ‘Service / Return Goods Form’ – see web link below: http://www.tps.com.au/Service/Service%20form_web.pdf Your full name Your company name Your email address or fax number ...
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