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TPS 123144/1, User Manual, Page: 20 / 28

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7. Initialising the Aqua-DY

If the calibration settings of the

Aqua-DY

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 a sensor is replaced.

To initialise the

Aqua-DY

…

1.

Switch the

Aqua-DY

off.

2.

Press AND HOLD the

key while switching the

Aqua-DY

on.

3.

The following messages are now displayed…

Memory & Cal
Reset !

�

You MUST
Re-Calibrate

�

TPS AQUA-DY
V1.0

S1234

4.

The meter then displays % Saturation and Temperature. Note that the
decimal points have been replaced with a “

�

“, to indicate that the

unit requires re-calibration.

8. Instrument software version number.

If you need to phone or fax TPS for any further technical assistance, the
version number of your

Aqua-DY

firmware may of benefit to us. Please

obtain the version number before phoning or faxing.

The version number is displayed on the bottom left of the display when
the

Aqua-DY

is switched on. For example…

TPS AQUA-DY
V1.0

S1234

“

V1.0

” in this example is the firmware version number.

“

S1234

” in this example is the instrument’s serial number.

Page 19

Summary of Contents for 123144/1

Page 1: ...QUALITY SERVICE VALUE tps com au Aqua DY User Manual Aqua Series Portables User Friendly Waterproof One Touch Calibration ...

Page 2: ... listed Sub sections have also been included to enable you to find the information you need at a glance 1 Introduction The introduction has a diagram and explanation of the display and controls of the Aqua DY It also contains a full listing of all of the items that you should have received with your Aqua DY Please take the time to read this section as it explains some of items that are mentioned i...

Page 3: ...TPS Pty Ltd Phone 07 3205 8027 International 61 7 3205 8027 Email sales tps com au Web www tps com au Aqua DY Dissolved Oxygen Temp Meter Version 1 1 Date 15 06 2021 Page 2 ...

Page 4: ...sages 15 5 Setting the Salinity Correction Value 16 6 Battery 17 6 1 Battery Saver Function 17 6 2 Changing the Battery 18 7 Initialising the Aqua DY 19 8 Instrument software version number 19 9 Troubleshooting 20 9 1 General Error Messages 20 9 2 Dissolved Oxygen Troubleshooting 21 9 3 Temperature Troubleshooting 22 10 Dissolved Oxygen Sensor Fundamentals 23 10 1 Operating Principle 23 10 2 Maint...

Page 5: ...1 Introduction 1 1 Aqua DY Display and Controls Page 4 ...

Page 6: ...rror messages are also provided Used to calibrate all parameters See sections 3 4 and 5 Used to select Saturation ppM Manual Salinity or Temperature modes See section 2 Switches the Aqua DY on and off Hold this key for 3 seconds to invoke Battery Saver mode See section 6 and These keys toggle the Aqua DY between Large Display mode and Dual Display mode See section 2 NOTE The digits in Large Displa...

Page 7: ...a DY Dissolved Oxygen Temperature Instrument 123144 1 123144 3 123144 5 2 Oxygen sensor 123204 3 Oxygen sensor cable see cable label for part No 1 3 or 5m cable 4 Membrane kit for oxygen sensor 123300 5 Manual Options that may have been ordered with your Aqua DY 1 Extended cable ordered by the metre 130040 2 Carry Case 130057 Page 6 ...

Page 8: ... C dissolved oxygen sensor limited to 45 O C 0 1 O C 0 2 O C 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 Temperature Specifications Temperature Sensor Offset Range 10 0o ...

Page 9: ... and error messages Power 9V Alkaline Battery for 100 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 O C Humidity 0 to 95 R H Page 8 ...

Page 10: ... 8 24ppMS 25 0o c Dissolved Oxygen data in ppM mg L units is shown on the top line and Temperature data is shown on the bottom line Select this mode to calibrate the ppM readout The S is shown after the ppM units when the Salinity correction value is set to greater than 0 0ppK see section 5 Press or to toggle between dual readout or large digit readout Salinity Mode 36 0ppK The Salinity correction...

Page 11: ...perature Press or to toggle between regular readout or large digit readout Back to Saturation mode Note The decimal point is replaced by a if a Dissolved Oxygen or Temperature calibration has failed see sections 3 and 4 if the unit is initialised see section 7 or if the unit has lost its factory calibration see section 9 1 Page 10 ...

Page 12: ...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 sens...

Page 13: ...e section 10 6 If salinity corrected ppM Dissolved Oxygen readings are required set the salinity correction value before taking sample measurements See section 5 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 p...

Page 14: ... has failed the Aqua DY 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 DY 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 DY will display the following message and then the failed span value of the ...

Page 15: ...mperature water alongside a good quality mercury thermometer Stir the sensor and the thermometer gently to ensure an even temperature throughout the beaker 5 When the reading has stabilised press and hold the key for 2 seconds 6 The reading from the sensor is now displayed on the top line and the value you are going to set is on the bottom line For example Enter 25 0o c Temp 26 0 7 Press the and k...

Page 16: ... unless the Dissolved Oxygen sensor is replaced or the meter is initialised 4 3 Calibration Messages 1 If a temperature calibration has been successfully performed the Aqua DY will display the offset value of the sensor For example Cal OK Offset 1 0o c 2 If a temperature calibration has failed the Aqua DY will display the failed offset value of the sensor Cal Failed Offset 10 5o c Page 15 ...

Page 17: ... in Salinity mode see section 2 The currently selected salinity correction value is displayed 4 Press and hold the key for 2 seconds 5 The display should now look like this Enter Man Sal 36 0 6 Press the and keys until the bottom line shows the salinity value obtained in step 1 7 Press the or key to set the salinity correction value NOTES 1 For non salinity corrected readings in ppM mode simply se...

Page 18: ...nu is now displayed For example ON 9 00V 4 In this mode use the or keys to toggle the battery saver function on or off ON enables the battery saver function The unit will turn itself off after 5 minutes OFF disables the battery saver function The unit will not switch itself off NOTE The display also shows the battery volts This gives the operator an idea of how much battery life is remaining The s...

Page 19: ...diagram below 2 Raise the fold out stand so it is out of the way and then fully loosen both screws It is not necessary to pull the screws all the way out Lift off the battery cover 3 Replace the battery with a new alkaline 9V battery 4 Re fit the battery cover and tighten the screws Do not over tighten Page 18 ...

Page 20: ...Y V1 0 S1234 4 The meter then displays Saturation and Temperature Note that the decimal points have been replaced with a to indicate that the unit requires re calibration 8 Instrument software version number If you need to phone or fax TPS for any further technical assistance the version number of your Aqua DY firmware may of benefit to us Please obtain the version number before phoning or faxing ...

Page 21: ...ry Meter will not turn on Battery is exhausted Replace the battery Flashing symbol Battery is below 7 50 volts Replace the battery soon Note that the unit will switch itself off when the battery falls below 6 00 volts 9 2 Dissolved Oxygen Troubleshooting Symptom Possible Causes Remedy Unit fails to calibrate even with new sensor Calibration settings outside of allowable limits due to previous fail...

Page 22: ...l poisoning Return to the TPS factory for cleaning and service Tarnished or scratched Gold cathode Sensor has been chemically poisoned or physically damaged Return to the TPS factory for cleaning and service Meter reads OVR ppM or OVR 1 Sensor has not yet polarised 1 Sensor is faulty Wait for 2 3 minutes for the sensor to polarise after the Aqua DY is switched on Return sensor to factory for repai...

Page 23: ...ble cable 2 Faulty sensor 1 Faulty instrument Fit new detachable cable Fit new sensor Return instrument to factory for repair Temperature inaccurate and cannot be calibrated 1 Faulty detachable cable 1 Faulty sensor 1 Faulty instrument Fit new detachable cable Fit new sensor Return instrument to factory for repair Page 22 ...

Page 24: ...lastic membrane In this case the plastic is 0 001 inch PTFE Teflon sheet It must be realised that using membranes of very different thicknesses will result in an error in the temperature compensation that is applied in the instrument for the membrane permeability This coefficient is 4 2 o C at 25o C for this thickness membrane A polarising voltage of about 800 millivolts is applied between the two...

Page 25: ...r details on how to change the membrane 10 3 Sensor Storage The Dissolved Oxygen sensor should be kept moist when not in use to prevent the thin film of electrolyte behind the membrane from drying out To achieve this the sensor can be stored with the tip in water Alternatively use a wetting cap such as those supplied with pH sensors For long term storage of several weeks or more the Dissolved Oxyg...

Page 26: ...ortance of correct interpretation of the salinity The Clark Sensor measures the partial pressure of oxygen diffusing through a membrane The current is a linear measure of this partial pressure assuming sufficient liquid flow conditions With air at sea level the 20 9 oxygen exerts about 15 5 cm of Mercury pressure Water in equilibrium with air and with no oxygen demand C O D B O D etc is saturated ...

Page 27: ...the sensor c Salinity correction is performed automatically once the Salinity value of the solution is entered section 5 10 5 Equilibrium Conditions Whilst Saline Water has a lower ppM than does Fresh Water it does not mean it necessarily has less biologically available oxygen Both have 100 Saturation presuming no Chemical Oxygen Demand C O D Biological Oxygen Demand B O D etc because both are in ...

Page 28: ...e the flow is sufficiently high Tests with this sensor have shown that flow rates above 0 2 litres minute past the membrane give results indistinguishable from those with appreciably higher flow rates 5 litres minute Fluctuations in readings due to air bubbles passing through the membrane are a different matter however With the type of sensor to be used with this instrument very little change in d...

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