TPS WP-90 Handbook
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TPS WP-90 Handbook

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Congratulations !
You have purchased the latest in Handheld Specific Ion-pH-mV-Temperature
instrumentation. We trust that your new WP-90 will give you many years of
reliable service.
The WP-90 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 WP-90. It also contains a full listing of all of the items that you should
have received with your WP-90. 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 WP-90,
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.
TPS Pty Ltd
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
E-mail
: tps@tps.com.au
Web Site
: www.tps.com.au
Model WP-90
Specific Ion, pH,
mV, & Temp. Meter
Handbook Version : 1.1
Date
: 07
Jun 01
Author
: MS

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Summary of Contents for TPS WP-90

  • Page 1 The introduction has a diagram and explanation of the display and controls of the WP-90. It also contains a full listing of all of the items that you should have received with your WP-90. Please take the time to read this section, as it explains some of items that are mentioned in subsequent sections.

  • Page 2: Table Of Contents

    Page 2 Contents Introduction..................4 1.1 WP-90 Display and Controls................4 1.2 Unpacking Information..................6 1.3 Specifications....................7 WP-90 Menu Structure ..............9 Specific Ion Mode ................. 11 3.1 Selecting ppM or ppK Mode ................11 3.2 Selecting Exponential Mode (e.g. Molar) ............13 Specific Ion Calibration ..............
  • Page 3 Clock Function ................36 15.1 Setting the Clock ..................36 15.2 Displaying or Hiding the Clock..............36 Selecting Buffers for Auto Buffer Recognition ....... 37 Initialising the WP-90 ..............38 Instrument firmware version number........38 Troubleshooting................ 39 19.1 General Errors .................... 39 19.2 Specific Ion, pH and mV Troubleshooting...........

  • Page 4: Introduction

    Page 4 1. Introduction 1.1 WP-90 Display and Controls...
  • Page 5 (section 8.1), setting the clock (section 15.1), setting the automatic logging period (section 11), and displaying GLP information (section 9.1). key is also used to initialise the WP-90 at turn-on. See section 17. ² Switches the WP-90 on and off.

  • Page 6: Unpacking Information

    Page 6 1.2 Unpacking Information Before using your new WP-90, please check that the following accessories have been included… Part No WP-90 Specific Ion-pH-mV-Temp Instrument ....121191 Temperature/ATC Sensor ..........121247 Battery charger ..............130037 WP-90 Handbook............130050 Options that may have been ordered with your WP-90…...

  • Page 7: Specifications

    Page 7 1.3 Specifications Mode Ranges Resolution Accuracy Auto-ranging, in 3 significant ± least significant Specific Ions units of ppM, ppK digits digit and Exponential Notation 0 to 14.00 pH 0.01 pH ±0.01 pH mV & Relative mV 0 to +/-500.0 mV 0.15 mV ±0.3 mV 0 to ±1500 mV...
  • Page 8 Page 8 General Specifications 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.

  • Page 9: Menu Structure

    Page 9 2. WP-90 Menu Structure A detailed breakdown of the menu system of the WP-90 is shown below. This diagram provides a quick reference for the menu functions available for the WP-90. Press the function keys in normal display mode, to perform the following tasks: : Press to record current data plus date and time into memory.
  • Page 10 Page 10 WP-90 Menu Structure → F1:Cal. → F1:Ion Pri Menu (only in Ion mode) or F1:pH (only in pH mode) F2:Temp (in all modes) F3:Ion Sec (only in Ion mode) → F2:Notepad → F1:Recall F2:Erase F3:Print * → F1:Min F4:Prog.

  • Page 11: Specific Ion Mode

    Press to select readout in ppM (parts per million) and ppK (parts per thousand). The WP-90 will automatically select the range that provides the best resolution for the sample being measured. Select the type of Specific Ion to be measured.
  • Page 12 Press to save the Secondary Standard. The WP-90 will now return to normal measurement mode. A “ * ” will be shown is place of the decimal point if the Specific Ion mode is not calibrated, or if calibration has failed.

  • Page 13: Selecting Exponential Mode (E.g. Molar)

    Molar. Select Ion Mode ppM/ppK Press to select Exponential readout (e.g. Molar). The WP-90 will automatically select the range that provides the best resolution for the sample being measured. Select the type of Specific Ion to be measured.
  • Page 14 Press to save the Secondary Standard. The WP-90 will now return to normal measurement mode. A “ * ” will be shown is place of the decimal point if the Specific Ion mode is not calibrated, or if calibration has failed.

  • Page 15: Specific Ion Calibration

    → → F1:Cal → → F1:Ion Pri). Select Primary Calibration ( The following message should be displayed. The current reading is displayed on the top left. A “∗” in the reading indicates that the WP-90 is currently not calibrated. 1*234ppM 25.0...
  • Page 16 → → F1:Cal → → F3:Ion Sec). 10. Select Secondary Calibration ( The following message should be displayed. The current reading is displayed on the top left. A “∗” in the reading indicates that the WP-90 is currently not calibrated. 0*123ppM 25.0...

  • Page 17: Calibration Notes

    This information can be recalled or printed later using the GLP function (see section 9). The WP-90 displays the value of the standard to which it will attempt to calibrate. Ensure that the standard value displayed corresponds to the standard that you are using.

  • Page 18: Ph Calibration

    The ∗ will 14. When the reading has stabilised, press the now be replaced by a decimal point, if calibration was successful. 15. The WP-90 is now calibrated for pH and is ready for use. Discard the used samples of buffer.

  • Page 19: Calibration Notes

    This information can be recalled or printed later using the GLP function (see section 9). The WP-90 displays the value of the pH buffer to which it will attempt to calibrate. Ensure that the buffer value displayed corresponds to the buffer that you are using.

  • Page 20: Mv Calibration

    0mVR 25.0 500mV F4:Zeros 31/12 12:00:00 The WP-90 Relative mV mode is now zeroed and is ready for use. The readout can be re-zeroed by pressing the key whenever required. 7.1 Notes The Relative mV offset is retained in memory when the WP-90 is switched off, even when the battery is removed.

  • Page 21: Temperature Calibration

    The ∗ will now be replaced by a decimal point, if calibration was successful. Alternatively, press the key to abort temperature calibration. The WP-90 is now calibrated for Temperature and is ready for use. The unit can now be calibrated for Specific Ions and pH.

  • Page 22: Calibration Notes

    8.2 Calibration Notes Temperature calibration information is retained in memory when the WP-90 is switched off, even when the battery is removed. This information can be recalled or printed later using the GLP function (see section 9). Temperature does not need to be re-calibrated unless the sensor is replaced or the meter is initialised.

  • Page 23: Good Laboratory Practices (Glp)

    Page 23 9. Good Laboratory Practices (GLP) The WP-90 keeps a record of the date and time of the last Specific Ion, pH and Temperature calibrations as part of GLP guidelines. 9.1 To recall GLP information on the display Switch the meter on.
  • Page 24 Page 24 GLP Display sequence… WP90 V1.0 R1234 ↓ ↓ :More ↑ ↑ :Back Ion Offs 10.0 @ 31/12/98 11:00 Ion Slope 99.0% @ 31/2/98 11:10 pH Asy 0.10pH @ 31/12/98 11:20 pH Slope 99.0% @ 31/12/98 11:30 Temp Offset 1.0 @ 31/12/97 11:40 Exit...

  • Page 25: Failed Calibration

    PC via the RS232 port. This function is available only when the optional RS232 port is fitted. Switch the meter on. Ensure that the WP-90 RS232 cable is connected to the instrument and to the printer or PC. → → F4:Setup → → F3:GLP) Select the GLP menu.

  • Page 26: Instrument Serial Number

    Page 26 9.4 Instrument Serial Number In case the barcode serial number that is fitted to the rear of the WP-90 is removed or becomes illegible, it is also available on the WP-90 display. • The serial number is displayed at turn-on…...

  • Page 27: Notepad Function

    Repeat steps 1 & 2 as often as required. The maximum number of readings that can be stored in the Notepad is 150. 10.2 Recalling Records from the Notepad To recall records from the Notepad onto the WP-90 display… → → F2:Notepad) Select the Notepad menu ( Select F1:Recall from the menu.

  • Page 28: Erasing Records From The Notepad

    Connect the other end of the RS232 cable to an RS232 Printer, or to COM1 or COM2 of a PC. Ensure that the baud rate for the printer or PC and the WP-90 are the same. If necessary, alter the baud rate of the WP-90 (see section 12.1).

  • Page 29: Automatic Datalogging

    , then the WP-90 will automatically log a record every 5 seconds. If the optional RS232 port is fitted, the WP-90 will ask if the records are to be logged into the Notepad, or sent directly to the RS232 port.
  • Page 30 Page 30 To start automatic logging, press in normal display mode. If the WP-90 is logging into the Notepad, the display will look like this… 100.0ppM 25.0 Log# 1 12:00:00 The log number will increment and the WP-90 will beep each time a reading is recorded.

  • Page 31: Rs232 Port

    12.2 Sending Readings to the RS232 Port Press to instantly send readings to the RS232 port whenever the WP-90 is in normal display mode. This function is disabled if the automatic logging period is set to greater than zero (see section 11).

  • Page 32: Commands

    Page 32 12.5 Commands The following commands can be sent from a PC to the WP-90. Note that <cr> denotes carriage return and <lf> denotes a line feed. Action Command Notes Request current data ?D<cr> Returns the current Specific Ion/pH/mV, Temperature, date and time from the WP-90.

  • Page 33: Data Format

    When data is requested by a PC with the ?D or ?R commands (section 12.5), it is terminated with a carriage return. When data is sent by the WP-90 using the Print function (section 10.4) or the Instant Send function (section 12.2), the data ends with a carriage return and a line...

  • Page 34: Glp Data Format

    Page 34 12.7 GLP Data Format GLP information is returned as 7 lines terminated by a carriage return. When using the “?G” command (section 12.5), the computer must respond with a character after receiving each line. For example… WP90 V1.0 R1234 @ 31/12/98 12:00 Offset= 10.0mV @ 31/12/98 11:00 Slope=...

  • Page 35: Battery Saver Function

    14. Recharging the Battery symbol flashes when the battery drops below 5.60 volts. The battery should be recharged at this point. If the battery is not recharged, the WP-90 will switch itself off when the battery drops below 5.00 volts.

  • Page 36: Clock Function

    Press to quit without resetting the clock. Note The WP-90 does not test for a valid day of the month when setting the clock (eg: attempting to enter 31/02/96 is not corrected). 15.2 Displaying or Hiding the Clock Date and time are normally displayed along with the Specific Ion/pH/mV and Temperature readings.

  • Page 37: Selecting Buffers For Auto Buffer Recognition

    Page 37 16. Selecting Buffers for Auto Buffer Recognition The WP-90 is factory set to automatically recognise pH4.00, pH6.88 and pH9.23 buffers. However, some users may prefer to use pH7.00 instead of pH6.88 and pH10.00 instead of pH9.23. The following procedure describes how to set which of these buffers are automatically recognised at calibration.

  • Page 38: Initialising The Wp-90

    Page 38 17. Initialising the WP-90 If the calibration settings of the WP-90 exceed the allowable limits, the unit may need to be initialised to factory default values. To initialise the WP-90… Switch the WP-90 OFF. Press and HOLD the key while switching the WP-90 back on.

  • Page 39: Troubleshooting

    Possible Causes Remedy Factory Cal. The EEPROM chip which The unit must be returned to Failed contains the factory TPS for service. calibration information has failed. Memory Failed User calibration settings Re-calibrate the instrument… • 2-point calibration for Calibration Lost have been lost or corrupted.

  • Page 40: Specific Ion, Ph And Mv Troubleshooting

    Standard or pH Buffer. primary Ion Standard or pH (Specific Ion slope Buffer for which the WP-90 is less than 50% or has been set (sections 3 & 16). pH Slope is less 2. Ion sensor surface or pH Clean Ion sensor or pH glass than 85%).

  • Page 41: Temperature Troubleshooting

    Page 41 Specific Ion, pH and mV Troubleshooting, continued… Unstable readings. 1. Reference electrolyte Refill electrolyte. See Ion chamber needs to be sensor specifications for correct refilled. electrolyte. Use saturated KCl for pH sensor. 2. Reference junction blocked. Clean reference junction, as per instructions supplied with the sensor.
  • Page 42 Page 42 3. Faulty instrument. Return to factory for repair.

  • Page 43: Ph Sensor Fundamentals

    Page 43 20. 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 44: Slope Of A Ph Sensor

    Page 44 20.2 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 25 C As the pH goes down, an ideal pH sensor produces +59mV/pH unit.

  • Page 45: Ph Temperature Compensation

    The following test can be performed to determine if the reference junction of a pH sensor is making adequate contact with the sample solution. Calibrate the WP-90, as per section 5.1. Dilute 1 part of pH6.88 buffer with 9 parts of distilled water.

  • Page 46: Determining If A Ph Meter Or A Sensor Is Faulty

    Page 46 20.5 Determining if a pH meter or a sensor is faulty The following test can be performed to help determine if the WP-90 or the pH sensor is faulty. Initialise the WP-90 (see section 17). Disconnect the pH sensor.

  • Page 47: Warranty

    TPS Pty. Ltd. has a fine reputation for prompt and efficient service. In just a few days, our factory service engineers and technicians will examine and repair your equipment to your full satisfaction.
  • Page 48 Page 48 Please check that the following is enclosed with your equipment: • Your Name and daytime 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.

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