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Page 37

16. Troubleshooting

16.1 General Errors

Error Message

Possible Causes

Remedy

Factory Cal.
Failed

then:

See
Handbook

The EEPROM chip which
contains the factory
calibration information has
failed.

The unit must be returned to
TPS for service.

•

mV & Temperature readings
may be up to 10% incorrect.

•

pH readings will be accurate
after a 2-point calibration (use
manual temperature
compensation).

Memory Failed
Calibration Lost

then:

Initialized
MUST ReCalibrate

User calibration settings
have been lost or corrupted.

Re-calibrate the instrument. A
full 2-point calibration will be
required for pH (see section
4.1) and a 1 point calibration for
temperature (see section 7.1).

Flashing

symbol.

Battery is below 5.60 volts.

Recharge the battery. Note that
the unit will switch itself off
when the battery falls below
5.00 volts.

Meter displays the
word

OFF

, and

switches off.

Battery is below 5.00 volts.

Recharge the battery.
If this fails, check the charger.
If charger OK, replace the
battery.

Meter will not turn
on.

Battery is exhausted.

Recharge the battery.
If this fails, check the charger.
If charger OK, replace the
battery.

Battery does not
charge up when
charger is connected.

1. Faulty battery charger.
2. Faulty battery.

1. Connect the charger and

switch the power on.

2. Display the battery volts in

the battery saver menu (see
section 12).

3. If the battery volts are

increasing then the charger
is OK. If the battery volts
do not increase, then the
charger is faulty.

4. Replace the charger or the

battery, as required.

Содержание WP-80

Страница 1: ...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 WP 80 It also contains a full listing of all of the items that you should have received with your WP 80 Please take the time to read this section as it explains some of items that are mentioned in subsequent sections 3 M...

Страница 2: ...ty Ltd ABN 30 009 773 371 4 Jamberoo Street Springwood Brisbane Australia 4127 Phone 07 32 900 400 International 61 7 32 900 400 Fax 07 3808 4871 International 61 7 3808 4871 Email tps tps com au Web www tps com au ...

Страница 3: ...alibration 17 7 1 Calibration Procedure 17 7 2 Calibration Notes 17 7 3 Calibration Messages 18 7 4 Manual Temperature Setting 19 8 Good Laboratory Practices GLP 20 8 1 To recall GLP information on the display 20 8 2 Failed Calibration 21 8 3 Printing GLP Information to the RS232 Port 21 8 4 Instrument Serial Number 22 8 5 Additional GLP Features 22 9 Notepad Function 23 9 1 Recording Readings int...

Страница 4: ...the Clock 34 13 2 Displaying or Hiding the Clock 34 14 Selecting Buffers for Auto Buffer Recognition 35 15 Initialising the WP 80 36 16 Troubleshooting 37 16 1 General Errors 37 16 2 pH and mV Troubleshooting 38 16 3 Temperature Troubleshooting 39 17 Warranty 40 18 Appendices 42 18 1 pH Electrode Fundamentals 42 18 2 Checking the reference junction of a pH electrode 44 18 3 Determining if an instr...

Страница 5: ...Page 4 1 Introduction 1 1 WP 80 Display and Controls ...

Страница 6: ...e is selected See section 6 Press to access the user friendly menu system which makes the WP 80 a breeze to operate and The and keys are used when calibrating temperature readout section 7 setting manual temperature compensation section 7 4 setting the clock section 13 1 setting the automatic logging period section 10 and displaying GLP information section 8 1 The key is also used to initialise th...

Страница 7: ... 200mL 121381 6 Battery charger 130037 7 WP 80 Handbook 130050 Options that may have been ordered with your WP 80 1 RS232 Serial Interface Option includes cable 130039 2 Communication software for Microsoft Windows 95 130086 and all later versions 3 Hard Carry Case 130059 4 Battery charger lead for 12V cigarette lighter socket 130046 5 Battery charger lead for 12V DC with battery clips 130052 6 So...

Страница 8: ...1 00 pH pH Slope Range 85 0 to 105 0 Memory 150 readings including date and time Automatic Logging User set for one reading every 1 to 90 seconds minutes or hours RS232 Output optional 300 1200 9600 baud 8 bits no parity 1 stop bit XON XOFF Protocol Clock Calendar clock displays date month hours minutes seconds Year is recorded in memory and transmitted to optional RS232 port but is not displayed ...

Страница 9: ...tored and can be recalled or sent to the optional RS232 port at any time Input Impedance 3 x 1012 Ω Power 6V NiMH Rechargeable Battery for approx 50 hours operation Dimensions 187 x 110 x 51 mm Mass Instrument only Approx 440g Full Kit Approx 1 7kg Environment Temperature 0 to 45 o C Humidity 0 to 90 R H ...

Страница 10: ...e for the WP 80 F1 Cal F1 pH available when in pH mode F2 Temp F2 Notepad F1 Recall F2 Erase F3 Print F4 Prog F1 Min F2 Sec F3 Hr Set Period F3 Mode F1 pH F2 mV F3 Rel mV F4 Setup F1 Batt F1 OFF Disable Battery Saver F2 ON Enable Battery Saver F2 Clock F3 GLP F1 Recall F3 Print F4 Baud F1 300 F2 1200 F3 9600 These items available when the optional RS232 port is fitted ...

Страница 11: ...lays pH and Temperature readings simultaneously Press to show or hide the date and time For example 7 00pH 25 0 31 12 12 00 00 If the temperature probe is unplugged the manual temperature setting is displayed with 1o C resolution For example 7 00pH Man 25 31 12 12 00 00 3 1 2 mV Mode Displays mV and Temperature readings simultaneously Press to show or hide the date and time For example 1000mV 25 0...

Страница 12: ...R 25 0 31 12 12 00 00 If the temperature probe is unplugged no temperature value is displayed 1000mVR 660mV F4 Zeros Ö Ö 1000mVR 31 12 12 00 00 Notes 1 Temperature compensation does not apply in mV mode 2 The decimal point is replaced by a if a pH or Temperature calibration has failed sections 4 1 and 7 1 if the unit is initialised section 15 or if the unit has lost its factory calibration section...

Страница 13: ...tic buffer recognition See section 14 for a detailed explanation 4 Select pH Mode F3 Mode F1 pH 5 Ensure that temperature has already been calibrated or manually set see sections 7 1 and 7 4 NOTE If the decimal point in the temperature reading is shown by a then the temperature readout is not calibrated 6 Remove the wetting cap from the pH sensor 7 Rinse the pH and Temperature sensors in distilled...

Страница 14: ...pH4 00 pH9 23 or pH10 00 Buffer so that the bulb and reference junction are both covered as per the diagram in step 8 above DO NOT place the electrodes directly into the buffer bottle NOTE pH9 23 buffer is highly unstable Avoid using this buffer if possible Discard immediately after use 13 Select pH Calibration F1 Cal F1 pH 14 When the reading has stabilised press the key to calibrate The will now...

Страница 15: ...uffer value displayed corresponds to the buffer that you are using 4 3 Calibration Messages 1 If a 1 point calibration has been successfully performed the WP 80 will display the following message and the asymmetry of the electrode For example 1 Point Cal OK Asy 0 10pH 2 If a 1 point calibration has failed the WP 80 will display the following message and the failed asymmetry value of the electrode ...

Страница 16: ... mode so the temperature sensor does not need to be connected 2 Switch the meter on 3 Select Relative mV Mode F3 Mode F3 Rel mV The display should now be showing Relative mV on the top line with absolute mV or date and time on the bottom line For example 1000mVR 25 0 660mV F4 Zeros Ö 1000mVR 25 0 31 12 12 00 00 Press to alternate between absolute mV or the clock on the bottom line 4 Remove the wet...

Страница 17: ...ample 0mVR 25 0 660mV F4 Zeros or 0mVR 25 0 31 12 12 00 00 8 The WP 80 Relative mV mode is now zeroed and is ready for use The readout can be re zeroed by pressing the key whenever required 6 1 Notes 1 The Relative mV offset is retained in memory when the WP 80 is switched off even when the battery is removed 2 The Relative mV zero is reset when leaving Relative mV mode see section 3 ...

Страница 18: ...F2 Temp 5 The reading from the probe is now displayed on the right of the display and the value you are going to set is shown on the left For example 25 0 20 0 Set F1 Cal 6 When the reading on the right has stabilised press the and keys until the reading on the left shows the same temperature as the mercury thermometer 7 Press the key to calibrate the temperature readout Alternatively press the ke...

Страница 19: ...formed the WP 80 will display the following message and the offset value of the probe For example Calibrate OK Offset 1 0 2 If a temperature calibration has failed the WP 80 will display the following message and the failed offset value of the probe For example Calibrate Failed Offset 10 5 ...

Страница 20: ...required for this 1 Switch the meter on 2 Measure the temperature of the sample 3 Select Temperature Calibration F1 Cal F2 Temp 4 The current temperature setting is now displayed For example 25 0 Man Temp Set F1 Save 5 Press the and keys until the display shows the temperature of the sample 6 Press the key to save the temperature value Alternatively press the key to quit and retain the current set...

Страница 21: ...instrument model firmware version number and instrument serial number are displayed along with a prompt describing how to scroll through the GLP information For example WP80 V3 5 S1234 More Back 5 Press the key to sequentially scroll through the GLP information for all parameters Press the key to scroll back to previous data The sequence of information displayed is shown below Press to abort at an...

Страница 22: ...ormation to the RS232 Port The GLP information stored in the instrument s memory can be sent to a printer or PC via the RS232 port This function is available only when the optional RS232 port is fitted 1 Switch the meter on 2 Ensure that the WP 80 RS232 cable is connected to the instrument and to the printer or PC 3 Send the GLP information to the RS232 port F4 Setup F3 GLP F3 Print 4 The GLP info...

Страница 23: ...234 pH mV Temp where S1234 is the serial number The serial number is displayed when recalling the GLP information section 8 1 The serial number is included on the printout of GLP information section 8 3 8 5 Additional GLP Features Another GLP requirement is to record the date and time of every reading The WP 80 does this for you when readings are recorded either with the Notepad function section 9...

Страница 24: ...en as required The maximum number of readings that can be stored in the Notepad is 150 9 2 Recalling Records from the Notepad To recall records from the Notepad onto the WP 80 display 1 Select the Notepad menu F2 Notepad 2 Select F1 Recall from the menu 3 Record number 1 is now displayed for example 7 00pH 25 0 1 F2 Clock 4 Press to alternatively display the date and time or the data for this reco...

Страница 25: ...ect one end of the RS232 cable to the Charger RS232 socket of the WP 80 The charger optional solar panel or optional car battery lead can be connected into the spare socket on the cable for long term use if required 2 Connect the other end of the RS232 cable to an RS232 Printer or to COM1 or COM2 of a PC 3 Ensure that the baud rate for the printer or PC and the WP 80 are the same If necessary alte...

Страница 26: ...set select whether this period is in minutes seconds or hours Press to save the period as minutes Press to save the period as seconds Press to save the period as hours eg If the period was set to 05 followed by then the WP 80 will automatically log a record every 5 seconds 5 If the optional RS232 port is fitted the WP 80 will ask if the records are to be logged into the Notepad or sent directly to...

Страница 27: ...0 will beep each time a reading is recorded If the WP 80 is sending records directly to the RS232 port the display will look like this 7 00pH 25 0 Sending 12 00 00 The WP 80 will beep each time a record is sent to the RS232 port 8 Press to stop automatic logging 9 Note The clock must be set before the WP 80 will allow automatic logging to start The message Clock Not Set is displayed if the clock i...

Страница 28: ... section 10 Records can be sent directly to the RS232 port rather than stored in memory during automatic datalogging See section 10 for details 11 3 RS232 Configuration The WP 80 RS232 configuration is 8 bits No Parity 1 Stop Bit XON XOFF Protocol 11 4 Communication and Statistical Software Communication between the WP 80 and a PC can be handled with any RS232 communication software A TPS communic...

Страница 29: ...th the message ENDS cr Erase logged data E cr Erases all logged records from the WP 80 memory Returns the message ERASED cr to confirm that the records have been erased Request status information S cr Returns the model name firmware version number instrument serial number and number of logged readings in memory eg WP80s ss sV3 5s sS1234s s150 cr where s are spaces Note that the number of logged re...

Страница 30: ...for pH readout mV for Millivolts readout mVR for Relative Millivolts readout TTTTTT is Temperature data 6 characters right justified uuu is the Temperature unit description which can be either of the following oC for real Temperature data oCm for manual Temperature compensation values dd mm yy is the date month and year data hh mm ss is the hours minutes and seconds data When requested by a PC wit...

Страница 31: ...ed by a carriage return When using the G command section 11 5 the computer must respond with a character after receiving each line For example WP80 V3 5 S1234 31 12 02 12 00 pH Asy 0 00pH 31 12 02 11 25 pH Slope 100 0 31 12 02 11 30 Temperature Offset 1 0oC 21 12 02 11 35 ENDS ...

Страница 32: ...iles prn txt csv 3 Navigate to the folder where your data file is stored and double click it to start the Text Import Wizard Note The default data folder for the WinTPS software is C My Documents WinTPS 4 In step 1 of the Text Import Wizard select Fixed width as per the sample screen below then press Next Note that the data column headers in the first row appear only when the data is downloaded us...

Страница 33: ...ss Next after the column breaks have been inserted 6 Simply press Finish at step 3 of the Text Import Wizard TPS recommends that the data format for each column be set once the data is in spreadsheet format For help on formatting the data columns charting graphing or other operations please consult the Microsoft Excel help file Alternatively please contact TPS and we will try to provide further as...

Страница 34: ... OFF 100 F2 ON The arrow indicates the current selection The bar graph and percentage indicate the approximate level of charge in the battery 4 Press to disable the battery saver function for continuous use Press to enable the battery saver function The meter will switch itself off if no key has been pressed for five minutes Press to quit the battery saver menu and retain the current setting 5 NOT...

Страница 35: ... to the minutes Press the and keys until the minutes are correct 7 Check that the date and time are correct Press to save the settings If any changes are needed press the key to move left to the desired position Press to quit without resetting the clock Notes 1 The WP 80 does not test for a valid day of the month when setting the clock eg attempting to enter 31 02 96 is not corrected 2 The WP 80 d...

Страница 36: ... and retain the current setting 5 The display will now show the currently selected high pH buffer Select F1 9 23pH Buffer F2 10 0pH The arrow indicates the current selection 6 Press to select pH9 23 as the high pH buffer Press to select pH10 00 as the high pH buffer the display shows 10 0 for the latter but this buffer is stored as pH10 00 Press to quit buffer selection and retain the current sett...

Страница 37: ... 3 The following messages should be displayed Initialized MUST ReCalibrate then WP80s V3 5 S1234 pH mV Temp The s after WP 80 is shown when the RS232 serial port option is fitted 4 The meter then displays pH and Temperature Note that the decimal points have been replaced with a to indicate that the unit requires recalibration Note When the WP 80 is initialised the automatically recognised buffers ...

Страница 38: ...ure see section 7 1 Flashing symbol Battery is below 5 60 volts Recharge the battery Note that the unit will switch itself off when the battery falls below 5 00 volts Meter displays the word OFF and switches off Battery is below 5 00 volts Recharge the battery If this fails check the charger If charger OK replace the battery Meter will not turn on Battery is exhausted Recharge the battery If this ...

Страница 39: ...tomatically recognise see section 14 Clean glass bulb as per instructions supplied with the electrode Attempt rejuvenation as per instructions supplied with the electrode If not successful replace electrode Dry in a warm place Replace buffers Unstable readings 1 Electrolyte chamber needs to be refilled 2 Reference junction blocked 3 Glass bulb not clean 4 Bubble in glass bulb 5 Faulty connection t...

Страница 40: ...if necessary 2 Replace electrode Displays 4 5 pH for all solutions Glass bulb or internal stem cracked Replace electrode 16 3 Temperature Troubleshooting Symptom Possible Causes Remedy Displays Man when temperature probe is plugged in 1 Faulty temperature probe Fit new temperature probe part number 121247 Temperature inaccurate and cannot be calibrated 1 Faulty connector 2 Faulty temperature probe...

Страница 41: ...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 are attempted by unauthorised persons or the serial number is missing PROCEDURE FOR SERVICE If you feel that this equipment is in need of repair please re read the manual Som...

Страница 42: ...ired 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 days or if you decline to have the equipment repaired the complete unit will be returned to you freight paid not repaired For full account customers the repair charges will be debited to your ac...

Страница 43: ...as the reference junction 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 18 1 1 Asymmetry of a pH Electrode An ideal pH electrode produces 0 mV output at 7 00 pH In practice pH electrodes generally produce 0 mV output at slightly above or below 7 00 pH The amount of v...

Страница 44: ...unit In practice pH electrodes usually produce slightly less than this The output of a pH electrode is expressed as a percentage of an ideal electrode For example an ideal electrode that produces 59mV pH unit has 100 Slope An electrode that produces 50 15mV pH unit has 85 Slope see Figure 18 2 600 400 200 0 200 400 600 0 7 14 mV 85 Slope at 25 oC 50 15mV pH 100 Slope at 25 oC 59mV pH Response of p...

Страница 45: ...2 Checking the reference junction of a pH electrode If pH readings are inaccurate or unstable the reference junction of the electrode may be blocked The following test can be performed to determine if the reference junction of a pH electrode is making adequate contact with the sample solution 1 Calibrate the WP 80 as per section 4 1 2 Dilute 1 part of pH6 88 buffer with 9 parts of distilled water ...

Страница 46: ...perating correctly the reading should be totally stable with the wire firmly in place If not the meter requires servicing 6 Now carefully disconnect the wire from the centre pin only make sure the other end of the wire remains connected to the outside frame of the connector 7 The reading should steadily drift away from 7 00 either up or down at a rate of approximately 1 pH or less every 3 seconds ...

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