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-ORP-
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.
Model WP-90
Specific Ion, pH,
ORP & Temp. Meter
Version:
2.0
Date:
1-Jul-2012

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Summary of Contents for TPS WP-90

  • Page 1 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.
  • Page 2 Page 2 TPS Pty Ltd 6 / 253 Leitchs Road Brendale QLD 4500 Australia Phone : (07) 32 058 027 International : 61 7 32 058 027 : (07) 3808 4871 International : 61 7 3808 4871 Email : tps@tps.com.au...

  • Page 3: Table Of Contents

    Page 3 Contents Introduction ..................5 WP-90 Display and Controls ..............5 Unpacking Information ................7 Specifications ..................8 WP-90 Menu Structure ..............9 Specific Ion Mode ................11 Selecting ppM or ppK Mode..............11 Selecting Exponential Mode (e.g. Molar) ..........13 Specific Ion Calibration ..............
  • Page 4 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...

  • Page 5: Introduction

    Page 5 1. Introduction 1.1 WP-90 Display and Controls...
  • Page 6 (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. Switches the WP-90 on and off. Display 32 character alpha-numeric display with user-friendly menu and prompting system.

  • Page 7: Unpacking Information

    Page 7 1.2 Unpacking Information Before using your new WP-90, please check that the following accessories have been included: Part No 1. WP-90 Specific Ion-pH-ORP-Temp Instrument ...... 121191 2. Temperature/ATC Sensor ............121247 3. Battery charger ..............130037 4. Manual Options that may have been ordered with your WP-90: 1.

  • Page 8: Specifications

    Page 8 1.3 Specifications Specific Ions Range ........Auto-ranging, in units of ppM, ppK and Exponential Notation Resolution ......3 significant digits Accuracy ......± least significant digit Range ........0 to 14.00 pH Resolution ......0.01 pH Accuracy ......±0.01 pH mV/ORP Range ........

  • Page 9: Menu Structure

    Page 9 Specific Ion ......Calibration in user-definable standards. mV/ORP ......Sensor calibration not available. Temperature ......Use a reference thermometer. Temperature Sensor Offset . -10.0 C to +10.0 Memory ........3600 readings including date and time Automatic Logging....User-set for one reading every 1 to 90 seconds, 1 to 90 minutes, or 1 to 24 hours.
  • Page 10 Page 10 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 WP-90 menu functions. → F1:Cal. → F1:Ion Pri (only in Ion mode) or F1:pH...

  • 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: Calibration Notes

    → → → → 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 Messages

    90 will display the following message, and the slope value of the sensor. For example… Sec Cal. OK Slope= 99.0% If a Secondary Calibration has failed, the WP-90 will display the following message, and the failed span value of the sensor. For example… Sec Cal. Failed Slope= 49.0%...

  • Page 18: Ph Calibration

    The ∗ 14. When the reading has stabilised, press the will 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/Orp Calibration

    25.0 0mVR 25.0 500mV F4:Zeros 31/12 12:00:00 The WP-90 Relative mV/ORP 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 reading from the sensor is now displayed on the right of the display, and the value you are going to set is shown on the left. A “∗” in the reading indicates that the WP-90 is currently not calibrated. For example…...

  • Page 22: Calibration Notes

    Temperature does not need to be re-calibrated unless the sensor is replaced or the meter is initialised. 8.3 Calibration Messages If a temperature calibration has been successfully performed, the WP-90 will display the following message and the offset value of the sensor. Calibrate OK Offset= If a temperature calibration has failed, the WP-90 will display the following message, and the failed offset value of the sensor.

  • 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 → → → → F4:Setup → → → → F3:GLP) Select the GLP menu.

  • Page 24: Failed Calibration

    9.2 Failed Calibration If calibration has failed, the GLP function will reset the date and time to zero. The WP-90 still shows the results of the last successful calibration. These calibration values are still used if further measurements are taken without re-calibrating.

  • Page 25: Instrument Serial Number

    Page 25 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 26: Notepad Function

    Repeat steps 1 & 2 as often as required. The maximum number of readings that can be stored in the Notepad is 3600. 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 27: 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 28: Automatic Data Logging

    For example, if the period is set to 05, followed by , then the WP- 90 will automatically log a record every 5 seconds. The WP-90 will ask if the records are to be logged into the Notepad, or sent directly to the RS232 port. Press to log records into the Notepad (maximum of 3600 readings).
  • Page 29 100.0ppM 25.0 Sending 12:00:00 The WP-90 will beep each time a record is sent to the RS232 port. Press to stop automatic logging. Notes: 1. The clock must be set before the WP-90 will allow automatic logging to start.

  • Page 30: Rs232 Port

    Records can be sent directly to the RS232 port rather than stored in memory during automatic data logging. See section 11 for details. 12.3 RS232 Configuration The WP-90 RS232 configuration is 8 bits, No Parity, 1 Stop Bit, XON/XOFF Protocol. 12.4 Communication and Statistical Software Communication between the WP-90 and a PC can be handled with any RS232 communication software.

  • Page 31: Commands

    Page 31 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 ?D<cr> Returns current Specific data Ion/pH/mV/ORP, Temperature, date and time from the WP-90.

  • Page 32: Data Format

    Page 32 12.6 Data Format Data is returned to the RS232 port by the WP-90 in the following format… LLLL DDDDDDDDUUU TTTTTTTTuuu dd/mm/yy hh:mm:ss where… is the Log Number. Maximum 4 characters, right justified. LLLL The WP-90 sends a Zero for instant readings (section 12.2)

  • Page 33: Glp Data Format

    Page 33 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 V2.0 R1234 @ 31/12/11 12:00 Offset= 10.0mV @ 31/12/11 11:00 Slope=...

  • Page 34: Battery Saver Function

    Page 34 13. Battery Saver Function The WP-90 is equipped with a battery saver function. If no button has been pressed for five minutes, the unit beeps and flashes the display for 20 seconds, and then shuts off. This function can be switched off for continuous use.

  • Page 35: Recharging The Battery

    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. To recharge the battery…...

  • 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 31/02/11 is not corrected). 15.2 Displaying or Hiding the Clock Date and time are normally displayed along with the Specific Ion/pH/mV/ORP 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 pH4.01, pH7.00 and pH9.18 buffers. However, some users may prefer to use pH6.86 instead of pH7.00 and pH10.01 instead of pH9.18. The following procedure describes how to set which of these buffers are automatically recognised at calibration.

  • Page 38: Initialising The Wp-90

    MUST ReCalibrate Ion pH ORP (The “s” after WP-90 is shown when the RS232 serial port option is fitted) 10. The meter then displays Specific Ion and Temperature. Note that the decimal points have been replaced with a ∗, to indicate that the unit requires re-calibration.

  • Page 39: Troubleshooting

    Error Message 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 Calibration Lost have been lost or instrument…...

  • Page 40: Specific Ion, Ph And Mv/Orp Troubleshooting

    Page 40 19.2 Specific Ion, pH and mV/ORP Troubleshooting Symptom Possible Causes Remedy Unit fails to Calibration settings outside Initialise the unit. See section calibrate, even of allowable limits due to with new sensor. previous failed calibration. 1 Point calibration 1.
  • Page 41 Page 41 Specific Ion, pH and mV/ORP Troubleshooting, continued… Unstable 1. Reference electrolyte Refill electrolyte. See Ion readings. chamber needs to be sensor specifications for refilled. correct electrolyte. Use saturated KCl for pH sensor. 2. Reference junction Clean reference junction, as blocked.

  • Page 42: Temperature Troubleshooting

    Page 42 19.3 Temperature Troubleshooting Symptom Possible Causes Remedy Displays “OVR c” 1. Faulty temperature Return sensor to factory for when sensor. repair or replacement. Temperature Return to factory for repair. sensor is plugged 2. Faulty instrument. Temperature 1. Faulty connector. Check the connector and inaccurate and replace if necessary.

  • Page 43: Appendices: Ph Sensor Theory

    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

    Page 45 20.3 pH Temperature Compensation The slope of a pH sensor (section 20.2) is affected by temperature. This effect is compensated for either by using an Automatic Temperature Compensation (ATC) sensor or by entering the sample temperature manually. Figure 20-3 shows the slope of a pH sensor at various temperatures.

  • Page 46: Warranty

    Please read service details on our ‘Service’ web page first: http://www.tps.com.au/service.htm TPS Pty Ltd has a reputation for prompt and efficient service. If you feel that this equipment is in need of repair, please re-read the manual. Sometimes, instruments are received for "repair" in perfect working order.
  • Page 47 Page 47 Please check that the following is enclosed with your equipment: • A TPS ‘Service / Return Goods Form’ – see web link below: http://www.tps.com.au/Service/Service%20form_web.pdf • Your full name • Your company name • Your email address or fax number •...

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