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TPS Aqua-CPA Manual Download Page 29

 

Page 29

10.3  pH Troubleshooting 

Symptom 

Possible Causes 

Remedy 

Unit fails to 
calibrate, even 
with new sensor. 

Calibration settings outside 
of allowable limits due to 
previous failed calibration. 

Initialise the unit. See 
section 9. 

1 Point calibration 
fails (Asymmetry 
is greater than +/-
1.00 pH). 

1.  Reference junction 

blocked. 

 

2.  Reference electrolyte 

contaminated. 

Clean reference junction, as 
per instructions supplied 
with the sensor. 

Flush with distilled water 
and replace electrolyte. 

2 Point calibration 
fails (Slope is less 
than 85.0%). 

1.  Incorrect primary buffer. 
 
 
 
 

2.  Glass bulb not clean. 
 
 

3.  Sensor is aged. 
 
 
 

4.  Connector is damp. 

5.  Buffers are inaccurate. 

Ensure that you are using 
the buffers which the  

Aqua-CPA

 has been set to 

automatically recognise 
(See section 7). 

Clean glass bulb as per 
instructions supplied with 
the sensor. 

Attempt rejuvenation, as per 
instructions supplied with 
the sensor. If not successful, 
replace sensor. 

Dry in a warm place. 

Replace buffers. 

Continued over the page… 

Summary of Contents for Aqua-CPA

Page 1: ...tions 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 CPA It also contains a full listing of all of the items that you should have received with your Aqua CPA Please take the time to read this section as it explains some of items that are mentioned in subsequent ...

Page 2: ...ty 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 Fax 07 3808 4871 International 61 7 3808 4871 Email tps tps com au Web www tps com au ...

Page 3: ...ration 16 4 2 pH Calibration Notes 18 4 3 pH Calibration Messages 18 5 Temperature Calibration 19 5 1 Calibration 19 5 2 Calibration Notes 19 5 3 Calibration Messages 20 5 4 Manual Temperature Setting 20 6 Selecting k 10 or k 0 1 sensor 21 7 Selecting Buffers for Auto Buffer Recognition 22 8 Battery 23 8 1 Battery Saver Function 23 8 2 Changing the Battery 24 9 Initialising the Aqua CPA 25 10 Trou...

Page 4: ...Page 4 11 1 Care Cleaning and Maintenance of Conductivity Sensors 31 11 2 Replatinising Conductivity Sensors 32 11 3 pH Sensor Fundamentals 33 11 4 Instrument software version number 36 12 Warranty 37 ...

Page 5: ...Page 5 1 Introduction 1 1 Aqua CPA Display and Controls ...

Page 6: ...alibrate all parameters See sections 3 4 and 5 Also used to select buffers for automatic buffer recognition See section 7 Switches between Conductivity or TDS or Salinity pH and Temperature See section 2 Used to select k 10 or k 0 1 sensor at turn on See section 6 Switches the Aqua CPA on and off Hold this key for 3 seconds to invoke Battery Saver mode See section 8 and These keys toggle the Aqua ...

Page 7: ... 121207 4 2 76mS cm Conductivity Standard 200mL 122306 5 pH7 00 Buffer 200mL 121387 6 pH4 01 Buffer 200mL 121381 7 9V Battery 8 Aqua CPA Manual Options that may have been ordered with your Aqua CPA 1 k 10 ATC Temperature Sensor plastic body 122221 2 k 0 1 ATC Temperature Sensor plastic body 122235 3 k 1 ATC Temperature Sensor glass body 122216 4 k 10 ATC Temperature Sensor glass body 122212 5 k 0 ...

Page 8: ...ted range at 25 O C TDS k 0 1 cell 0 to 1 000 ppM 0 to 10 00 ppM 0 to 100 0 ppM 0 to 1000 ppM k 1 cell 0 to 10 00 ppM 0 to 100 0 ppM 0 to 1000 ppM 0 to 10 00 ppK k 10 cell 0 to 100 0 ppM 0 to 1000 ppM 0 to 10 00 ppK 0 to 100 0 ppK 0 001ppM 0 01 ppM 1 ppM 0 01 ppK 0 01 ppM 0 1 ppM 1 ppM 0 01 ppK 0 1 ppM 1 ppM 0 01 ppK 0 1 ppK 0 5 of full scale of selected range at 25 OC Salinity k 0 1 cell 0 to 0 1...

Page 9: ...Ω 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 Temperature Specifications Temperature Sensor Offset Range 10 0o C to 10 0o C 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 o...

Page 10: ...elected the user can now enter the TDS Factor 2 2 Setting TDS Factor To set the TDS Factor 1 Press the key until the Aqua CPA is the mode selection menu Select the TDS Mode 2 Press the key and the currently selected TDS Factor is displayed For example TDS Factor 65 Press the key to increase the Factor Press the key to decrease the Factor Press the key when the desired value is displayed The new TD...

Page 11: ... data is shown on the top line and Temperature data is shown on the bottom line Manual Temperature setting with an m is shown if no Conductivity or Temperature sensor is connected Press or to toggle between regular readout or large digit readout pH plus Temperature Mode 7 00pH 25 0 pH data is shown on the top line and Temperature data is shown on the bottom line Manual Temperature setting with an ...

Page 12: ...k to Conductivity or TDS or Salinity plus pH and Temperature mode Notes The decimal point is replaced by a if a Conductivity pH or Temperature calibration has failed see sections 3 4 and 5 if the unit is initialised see section 9 or if the unit has lost its factory calibration see section 10 1 ...

Page 13: ... performed in Conductivity standard 3 1 Calibration Procedure 1 Switch the Aqua CPA on 2 Select a display mode showing Conductivity or TDS or Salinity readout section 0 3 Plug the Conductivity sensor into the sensor socket If a k 10 or k 0 1 sensor is being used ensure that it has been correctly selected see section 6 4 Rinse the Conductivity sensor in distilled water Shake off as much water as po...

Page 14: ...scard the used sample of standard after use It is advisable to use a narrow sample vessel to minimise the use of standard solution 10 When the reading has stabilised Press the key to calibrate The Aqua CPA will prompt the user to select the parameter if a combination display is shown Use the or keys to select Conductivity The display will change to Conductivity if the Aqua CPA is in TDS or Salinit...

Page 15: ...y performed the Aqua CPA will display zero value of the sensor For example Cal OK Zero 0 01uS 2 If a Standard calibration has been successfully performed the Aqua CPA will display the calculated k factor of the sensor For example Cal OK k 1 10 3 If a Standard calibration has failed the Aqua CPA will display the calculated k factor of the sensor following message and then the failed span value of t...

Page 16: ...the Conductivity sensor is not connected then the Aqua CPA will use manual temperature compensation 4 Ensure that temperature has already been calibrated or manually set see sections 5 1 and 5 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 and Conductivity sensors in d...

Page 17: ... dry 11 Place both sensors 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 sensors 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 pr...

Page 18: ... are using 4 3 pH Calibration Messages 1 If a 1 point calibration has been successfully performed the Aqua CPA 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 6 86 Cal OK then Asym 0 10pH Slope 100 0 2 If a 1 point calibration has failed the Aqua CPA will dis...

Page 19: ... to calibrate The Aqua CPA will prompt the user to select the parameter if a combination display is shown Use the or keys to select Temperature 5 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 0 Temp 26 0 6 Press the and keys until the bottom line shows the same temperature as the mercury thermometer 7 Pres...

Page 20: ...Manual Temperature Setting 1 Switch the Aqua CPA on 2 Select Temperature mode see section 2 3 Manual temperature setting is only available if the Conductivity sensor is not connected 4 Press and hold the key for 2 seconds The current Manual Temperature Setting is now displayed for example Enter Man Temp 25 0 5 Press the and keys until the bottom line shows the temperature which you wish to set Thi...

Page 21: ...menu is now displayed only if the k 0 1 or k 10 sensor is connected k 10 k Factor or k 0 1 k Factor 4 Press the and keys to alternate between a k 10 and a k 0 1 sensor 5 Press the key to save the selected setting Notes 1 The manual k factor selection is kept in memory when the meter is switched off even if the battery is removed 2 The manual k factor selection is reset to k 10 during initialisatio...

Page 22: ...played 4 The display will now show the currently selected primary buffer for example 7 00pH Select or 6 86pH Select 5 Use the or keys to alternate between pH7 00 and pH6 86 buffers 6 Press the key to save the primary buffer 7 After the message Buffer 2 Select the display will now show the currently selected secondary pH buffers for example 4 01 9 18pH Select or 4 01 10 0pH Select 8 Use the or keys...

Page 23: ...the meter already switched on press and HOLD the key for 3 seconds 3 The battery saver menu 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 NOTE The display also shows the battery volts This gives the operator an idea of how much battery life is remaining The symbol flashes when the battery volts drops below 7 50 volts At 6 00 vol...

Page 24: ...See the 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 25: ...may be required if an sensor is replaced To initialise the Aqua CPA 1 Switch the Aqua CPA off 2 Press AND HOLD the key while switching the Aqua CPA on 3 The following messages are now displayed Memory Cal Reset You MUST Re Calibrate TPS AQUA CPA V2 0 S1234 4 The meter then displays Conductivity pH and Temperature Note that the decimal points have been replaced with a to indicate that the unit requ...

Page 26: ...Failed Calib Lost Memory Reset You MUST Re Cal User calibration settings have been lost or corrupted Re calibrate the instrument Both a Zero and a Standard calibration will be required for Conductivity section 3 a 2 point calibration for pH section 4 and a 1 point calibration for temperature section 5 Meter displays the word OFF and switches off Battery is below 6 00 volts Replace the battery Mete...

Page 27: ...up of dirt or oily material on sensor wires 3 Platinum black coating has worn off 4 Standard solution is inaccurate 5 Sensor is faulty Immerse sensor at least to the vent hole in the white plastic cover Clean sensor as per the instructions detailed in section 11 1 Sensor requires replatinisation Return to the factory or see details in section 11 2 Replace standard solution Return sensor to factory...

Page 28: ...1 Sensor may have a build up of dirt or oily material on sensor wires Clean sensor as per the instructions detailed in section 11 1 Readings are low or near zero 1 Sensor may have a build up of dirt or oily material on sensor wires 2 Sensor is not immersed deeply enough 3 Sensor is faulty Clean sensor as per the instructions detailed in section 11 1 Immerse sensor at least to the vent hole in the ...

Page 29: ...r instructions supplied with the sensor Flush with distilled water and replace electrolyte 2 Point calibration fails Slope is less than 85 0 1 Incorrect primary buffer 2 Glass bulb not clean 3 Sensor is aged 4 Connector is damp 5 Buffers are inaccurate Ensure that you are using the buffers which the Aqua CPA has been set to automatically recognise See section 7 Clean glass bulb as per instructions...

Page 30: ...ion is successful Reference junction blocked Clean reference junction as per instructions supplied with the sensor Displays 7 00 for all solutions Electrical short in connector 1 Check connector Replace if necessary 2 Replace sensor Displays 4 5 pH for all solutions Glass bulb or internal stem cracked Replace sensor Display flashes ATC and LIMIT The Temperature is not within the ATC limits Cool He...

Page 31: ...e well with distilled water Conductivity sensors can be stored dry Ensure that the sensor is stored in a covered container to avoid dust and dirt build up 11 1 2 Cleaning of Conductivity of Sensors Platinised platinum Conductivity sensors can only be cleaned by rinsing in a suitable solvent DO NOT wipe the sensor wires as this will remove the platinum black layer 1 Rinsing in distilled water will ...

Page 32: ...ll in distilled water 3 Immerse the sensor in platinising solution at least to the vent hole in the white plastic cover Platinising solution is available from TPS part no 122300 Alternatively platinising solution can be prepared by dissolving 1g of Hydrogen Chloroplatinate H2PtCl16 in 30mL of distilled water and including about 0 01g of Lead Acetate CH3COO 2Pb and a drop or two of concentrated HCl...

Page 33: ...unction A saturated solution of KCl is used to make contact with the sample It is vital that the KCl solution has an adequate flow rate in order to obtain stable accurate pH measurements 11 3 1 Asymmetry of a pH Sensor An ideal pH sensor produces 0 mV output at 7 00 pH In practice pH sensors generally produce 0 mV output at slightly above or below 7 00 pH The amount of variance from 7 00 pH is cal...

Page 34: ...practice pH sensors usually produce slightly less than this The output of a pH sensor is expressed as a percentage of an ideal sensor For example an ideal sensor that produces 59mV pH unit has 100 Slope An sensor that produces 50 15mV pH unit has 85 Slope see Figure 11 2 600 400 200 0 200 400 600 0 7 14 85 Slope at 25 oC 50 15mV pH 100 Slope at 25 oC 59mV pH Response of pH Electrode as a Function ...

Page 35: ... Compensation ATC sensor or by entering the sample temperature manually Figure 11 3 shows the slope of a pH sensor at various temperatures 600 400 200 0 200 400 600 0 7 14 Electrode Potential mV at 0 oC 54mV pH Electrode Potential mV at 50 oC 64mV pH Electrode Potential mV at 100 oC 74mV pH pH Electrode Response as a Function of Temperature Electrode Response mV pH Figure 11 3 ...

Page 36: ...ur Aqua CPA 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 CPA is switched on For example TPS AQUA CPA V2 0 S1234 V2 0 in this example is the firmware version number S1234 in this example is the instrument s serial number ...

Page 37: ...ipment incorrect calibration incorrect operation or from interpretation of information derived from the equipment Specifications are subject to change without notice This warranty becomes invalid if modifications or repairs are carried out on this unit by unauthorised persons There are no express or implied warranties which extend beyond the face hereof Procedure for Service Please read service de...

Page 38: ...r equipment will be repaired and returned to you by express air freight where possible For instruments beyond warranty period a repair cost will be calculated from parts and labour costs and emailed to you If you decline to have the equipment repaired the complete instrument will be returned to you freight paid not serviced TPS Pty Ltd has only one service location which is located at our factory ...

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