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Page 17

7. Initialising the Aqua-D

If the calibration settings of the 

Aqua-D

 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-D

…

1. Switch the 

Aqua-D

 off.

2. Press AND HOLD the 

 key while switching the 

Aqua-D

 on.

3. The following messages are now displayed…

Memory & Cal
Reset !

↓↓

You MUST
Re-Calibrate

↓↓

TPS AQUA-D
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-D

 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-D

 is switched on. For example…

TPS AQUA-D
V1.0  S1234

“

V1.0

” in this example is the firmware version number.

“

S1234

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

Summary of Contents for Aqua-D

Page 1: ... 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 D It also contains a full listing of all of the items that you should have received with your Aqua D 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 ha...

Page 2: ...4 4 3 Calibration Messages 14 5 Setting the Salinity Correction Value 15 6 Battery Saver Function 16 7 Initialising the Aqua D 17 8 Instrument software version number 17 9 Troubleshooting 18 9 1 General Error Messages 18 9 2 Dissolved Oxygen Troubleshooting 19 9 3 Temperature Troubleshooting 20 10 Dissolved Oxygen Sensor Fundamentals 21 10 1 Operating Principle 21 10 2 Maintenance Of The Membrane ...

Page 3: ...Page 2 1 Introduction 1 1 Aqua D Display and Controls ...

Page 4: ...ts and error 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 D on and off Hold this key for 3 seconds to invoke Battery Saver mode See section 6 and These keys toggle the Aqua D between Large Display mode and Dual Display mode See section 2 NOTE The digits in Large ...

Page 5: ...nd membrane kit 2 1m detachable cable for ED1 Dissolved Oxygen sensor 123228 3 3m detachable cable for ED1 Dissolved Oxygen sensor 123230 4 5m detachable cable for ED1 Dissolved Oxygen sensor 123232 5 Extended cable ordered by the metre 130040 Options that may have been ordered with your Aqua D 1 Hard Plastic Carry Case 130057 2 Adaptor to fit sensor into standard BOD bottle 123201 Other spares 1 ...

Page 6: ...3m detachable cable for YSI Dissolved Oxygen sensor 123221 4 5m detachable cable for YSI Dissolved Oxygen sensor 123222 5 Extended cable ordered by the metre 130040 6 YSI non stirring BOD bottle sensor 123214 7 YSI self stirring BOD bottle sensor 123213 Options that may have been ordered with your Aqua DY 1 Hard Plastic Carry Case 130057 Other spares 1 Membrane kit 123300 includes Filling Solution...

Page 7: ...120 0 O 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...

Page 8: ...prompts and error messages Power 9V Alkaline Battery for 100 hours operation Battery Saver On Auto switch off after 5 minutes Off Continuous use Dimensions 157 x 78 x 35 mm Mass Instrument only Approx 200g Full Kit Approx 1 5kg Environment Temperature 0 to 45 O C Humidity 0 to 90 R H ...

Page 9: ...pM Mode 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 cor...

Page 10: ...rate Temperature 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 11: ...int 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 Oxyg...

Page 12: ...dings See 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 sho...

Page 13: ...libration has failed the Aqua D 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 D 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 D will display the following message and then the failed span value o...

Page 14: ...room temperature 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 th...

Page 15: ...alibrated 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 D 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 D will display the failed offset value of the sensor Cal Failed Offset 10 5o c ...

Page 16: ...eter is 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 si...

Page 17: ...enu 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 ...

Page 18: ...S AQUA D 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 D firmware may of benefit to us Please obtain the version number before phoning or f...

Page 19: ...ation settings have been lost or corrupted Re calibrate the instrument Both a Zero and an Air calibration are required for Dissolved Oxygen section 3 and a 1 point calibration for temperature section 4 Meter displays the word OFF and switches off Battery is below 6 00 volts Replace the battery Meter will not turn on Battery is exhausted Replace the battery Flashing symbol Battery is below 7 50 vol...

Page 20: ...ssure compensation diaphragm several times Membrane should be smooth and convex with no wrinkles Re fit membrane if necessary Replace membrane and re fill sensor Return sensor to factory for repair or replacement Blackened Silver anode Sensor has been exposed to sulphides or other chemical poisoning Return to the TPS factory for cleaning and service Tarnished or scratched Gold cathode Sensor has b...

Page 21: ... detachable cable 2 Faulty sensor 3 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 2 Faulty sensor 3 Faulty instrument Fit new detachable cable Fit new sensor Return instrument to factory for repair ...

Page 22: ...hind a plastic 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...

Page 23: ...brane 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 Oxygen sensor is best stored dry For t...

Page 24: ... the importance 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 sa...

Page 25: ...sor in 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 ...

Page 26: ...th 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 diffusion current is caused by altering t...

Page 27: ...the equipment Shipping damage is not covered by this warranty Please note A guarantee card is packed with the instrument or sensor This card must be completed at the time of purchase and the registration section returned to TPS Pty Ltd within 7 days No claims will be recognised without the original guarantee card or other proof of purchase This warranty becomes invalid if modifications or repairs ...

Page 28: ...ime phone number Your company name ORDER number and return street address A description of the fault Please be specific Note Please Repair does NOT describe a fault Your equipment will be repaired and returned to you by air express where possible For out of warranty units a repair cost will be calculated from parts and labour costs If payment is not received for the additional charges within 30 da...

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