Table of Contents
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Congratulations !
You have purchased the latest in Handheld Dissolved Oxygen-pH-mV-
Temperature instrumentation. We trust that your new WP-91 will give
you many years of reliable service.
The WP-91 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-91. It also contains a full listing of all of the items
that you should have received with your WP-91. 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-91, 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
International
Fax
International
E-mail
Web Site
: (07) 32 900 400
: 61 7 32 900 400
: (07) 3808 4871
: 61 7 3808 4871
: tps@tps.com.au
: www.tps.com.au
Model WP-91
Dissolved Oxygen –
pH – mV – Temp Meter
Version
: 1.2
Date
: 31-Oct-2003
Author
: MS
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Table of Contents
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Summary of Contents for TPS WP-91
- Page 1 2. Introduction The introduction has a diagram and explanation of the display and controls of the WP-91. It also contains a full listing of all of the items that you should have received with your WP-91. Please take the time to read this section, as it explains some of items that are mentioned in subsequent sections.
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Page 2: Table Of Contents
Page 2 Contents Introduction ....................4 WP-91 Display and Controls ...............4 Unpacking Information ................6 Specifications..................7 WP-91 Menu Structure................10 Oxygen Operating Modes ..............11 Dissolved Oxygen Calibration ...............13 Calibration Procedure................13 Measurement Notes: .................15 Calibration Notes................15 Calibration Messages ................16 pH Calibration ..................17 Calibration Procedure................17 Calibration Notes................19... - Page 3 Clock Function..................45 16.1 Setting the Clock ................45 16.2 Displaying or Hiding the Clock............45 Selecting pH6.88 or pH7.00 as the Primary Buffer ......46 Initialising the WP-91................47 Instrument firmware version number..........47 Troubleshooting .................48 20.1 General Errors................48 20.2 Dissolved Oxygen Troubleshooting ..........49 20.3...
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Page 4: Introduction
Page 4 1. Introduction 1.1 WP-91 Display and Controls... - Page 5 (section 7.1), setting the clock (section 16.1), setting the automatic logging period (section 12), and displaying GLP information (section 10.1). The key is also used to initialise the WP-91 at turn-on. See section 18. Switches the WP-91 on and off.
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Page 6: Unpacking Information
Page 6 1.2 Unpacking Information Before using your new WP-91, please check that the following accessories have been included: Part No WP-91 Dissolved Oxygen-pH-Temp Instrument ....123150 pH6.88 Buffer, 200mL ............121306 pH4.00 Buffer, 200mL ............121381 Battery charger ..............130037 WP-91 Handbook ..............130050 Options that may have been ordered with your WP-91: YSI Dissolved Oxygen-Temperature Sensor .......123204... -
Page 7: Specifications
Page 7 1.3 Specifications Mode Range* Resolution Accuracy Dissolved Oxygen 0 to 20.00 ppM 0.01 ppM ±0.2% of full 20.0 to 40.0 ppM 0.1 ppM scale of selected ppM (mg/L) range 0 to 240.0 % Sat 0.1 % Sat ±0.3% Saturation Dissolved Oxygen 240 to 450 % Sat 1 % Sat... - Page 8 Page 8 Temperature Compensation ..Automatic, 0 to 100...
- Page 9 Page 9 Additional Temperature Specifications Temp. Sensor Offset Range..-10.0 C to +10.0 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.
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Page 10: Menu Structure
Page 10 2. WP-91 Menu Structure A detailed breakdown of the menu system of the WP-91 is shown below. This diagram provides a quick reference for the menu functions available for the WP-91. → → Menu F1:Cal. F1:Oxy F2:Temp (not available in mV mode) -
Page 11: Oxygen Operating Modes
Page 11 3. Oxygen Operating Modes The WP-91 has three Oxygen modes : ppM (mg/L), % Saturation, and % Gaseous. To select an Oxygen mode, access the mode menu by pressing , then F3:Mode. 1. F1:ppM (ppM (mg/L) readout) Displays ppM Dissolved Oxygen, pH/mV and Temperature and the user-set Salinity value simultaneously. - Page 12 Page 12 2) The decimal point is replaced by a “∗ ∗ ” if a Dissolved Oxygen, pH or Temperature calibration has failed (sections 4, 5 & 7) or if the unit is initialised (section 18).
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Page 13: Dissolved Oxygen Calibration
Page 13 4. Dissolved Oxygen Calibration 4.1 Calibration Procedure 1. Plug the Dissolved Oxygen sensor into the Dissolved Oxygen socket. 2. Switch the meter on. → F3:Mode → F1 to F3). 3. Select the mode of your choice. ( 4. Ensure that temperature has already been calibrated (see section 7). NOTE: A “∗... - Page 14 Page 14 9. The WP-91 is now calibrated ready for Dissolved Oxygen measurement.
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Page 15: Measurement Notes
4. For optimum accuracy, set the altitude of atmospheric pressure before calibration. 5. All calibration information is retained in memory when the WP-91 is switched off, even when the battery is removed. This information can be recalled or printed later using the GLP function (see section 10). -
Page 16: Calibration Messages
Air Cal. OK Span=100.0% 3. If an Air calibration has failed, the WP-91 will display the following message, and the failed span value of the sensor. Air Cal. Fail... -
Page 17: Ph Calibration
6. Rinse the pH and Dissolved Oxygen/Temperature sensors in distilled water and blot them dry. 7. Ensure that you are using the primary buffer for which the WP-91 has been set (see section 17). Place both sensors into a small sample of pH6.88 (or pH7.00) buffer, so that the bulb and reference junction are both covered, as per the diagram over the page. - Page 18 The ∗ 13. When the reading has stabilised, press the will now be replaced by a decimal point, if calibration was successful. 14. The WP-91 is now calibrated for pH and is ready for use. Discard the used samples of buffer.
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Page 19: Calibration Notes
1 Point Cal. OK Asy= 0.10pH 2. If a 1-point calibration has failed, the WP-91 will display the following message, and the failed asymmetry value of the sensor. 1 Point Cal.Fail 1 Point Cal.Fail... -
Page 20: Temperature Calibration
7.2 Calibration Notes 1. Temperature calibration information is retained in memory when the WP-91 is switched off, even when the battery is removed. This information can be recalled or printed later using the GLP function (see section 10). -
Page 21: Calibration Messages
Page 21 7.3 Calibration Messages 1. If a temperature calibration has been successfully performed, the WP-91 will display the following message and the offset value of the probe. Calibrate OK Offset= 2. If a temperature calibration has failed, the WP-91 will display the following message, and the failed offset value of the probe. -
Page 22: Salinity Correction
Page 22 8. Salinity Correction Manual salinity correction for ppM Dissolved Oxygen readings is available on the WP-91. 1. Select Salinity-corrected ppM mode. → F3:Mode → F1:ppM → F2:ON). → F1:Cal → F4:Sal). 2. Set the Salinity correction value. ( If Altitude of Pressure Compensation is currently selected, then the →... -
Page 23: Altitude Or Atmospheric Pressure Correction
9. Altitude or Atmospheric Pressure Correction Manual altitude or atmospheric pressure correction are available on the WP-91. Either one or the other may be selected at any one time or the system can be switched off. 9.1 Selecting Altitude or Pressure Correction 1. -
Page 24: Changing The Altitude Or Pressure Correction Value
If Manual Salinity Correction is currently selected, then the above key sequence becomes : → F1:Cal → F4:Comp → F2:Altitude → F1:Cal → F4:Comp → F2:Pressure 3. The WP-91 now asks for the altitude or pressure. → → 0← ← m Alt >1013< HPa ↑... -
Page 25: Notes
These values are satisfactory for the precision required for most Dissolved Oxygen measurements. 3. If Altitude correction is switched on, an “A” is added to the WP-91 display in normal measurement mode. 4. If Atmospheric Pressure correction is switched on, a “P” is added to 5. -
Page 26: Good Laboratory Practices (Glp)
Page 26 10. Good Laboratory Practices (GLP) The WP-91 keeps a record of the date and time of the last Dissolved Oxygen, pH and Temperature calibrations as part of GLP guidelines. 10.1 To recall GLP information on the display 1. Switch the meter on. - Page 27 Page 27 GLP Display sequence… WP91 V1.2 S1234 ↓ ↓ :More ↑ ↑ :Back Oxy Zero 0.0% @ 31/12/03 11:00 Oxy Span 100.0% @ 31/12/03 11:10 Altitude 5000m @ 31/12/03 11:10 Pressure 1013HPa @ 31/12/03 11:10 pH Asy 0.10pH @ 31/12/03 11:20 pH Slope 100.0% @ 31/12/03 11:30 Temp Offset 1.0...
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Page 28: Failed Calibration
10.2 Failed Calibration If calibration has failed, the GLP function will reset the date and time to zero. The WP-91 still shows the results of the last successful calibration. These calibration values are still used if further measurements are taken without recalibrating. -
Page 29: Printing Glp Information To The Rs232 Port
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-91 RS232 cable is connected to the instrument and to the printer or PC. 3. Send the GLP information to the RS232 port…... -
Page 30: Instrument Serial Number
Page 30 10.4 Instrument Serial Number In case the serial number that is fitted to the rear of the WP-91 is removed or becomes illegible, it is also available on the WP-91 display. • The serial number is displayed at turn-on, WP91 V1.2 S1234... -
Page 31: Notepad Function
3. Repeat steps 1 & 2 as often as required. The maximum number of readings that can be stored in the Notepad is 150. 11.2 Recalling Records from the Notepad To recall records from the Notepad onto the WP-91 display: → F2:Notepad). 1. Select the Notepad menu ( 2. -
Page 32: Erasing Records From The Notepad
To erase all records from the Notepad: → F2:Notepad). 1. Select the Notepad menu ( 2. Select F2:Erase from the menu. 3. The WP-91 now asks if you are sure that you wish to erase all records… Erase, You Sure? 4. Press... -
Page 33: Printing Records From The Notepad To The Rs232 Port
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-91 are the same. If necessary, alter the baud rate of the WP-91 (see section 13.1). -
Page 34: Automatic Datalogging
, then the WP-91 will automatically log a record every 5 seconds. 5. If the optional RS232 port is fitted, the WP-91 will ask if the records are to be logged into the Notepad, or sent directly to the RS232 port. - Page 35 Page 35 7. To start automatic logging, press in normal display mode. If the WP-91 is logging into the Notepad, the display will look like this… 10.00 M 7.00 The log number will increment and the Log# 1 12:00:00 WP-91 will beep each time a reading is recorded.
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Page 36: Rs232 Port
95 and later is optionally available (part number 130086). Once the data is saved to disk, the next problem is how to use it. The data sent by the WP-91 is formatted in fixed-width columns that can be ® ®... - Page 37 Page 37 Information on how to use the software and import data is provided in the manual provided with the WinTPS CD-ROM.
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Page 38: Commands
Page 38 13.5 Commands The following commands can be sent from a PC to the WP-91. Note that <cr> denotes carriage return and <lf> denotes a line feed. Action Command Notes Request current ?D<cr> Returns current Dissolved data Oxygen, pH, Temperature, date and time from the WP-91. -
Page 39: Data Format
Page 39 13.6 Data Format Data is returned to the RS232 Port by the WP-91 in the following format. A “•” shown anywhere in this section denotes one space. LLLLs s DDDDDDuuus s SSSSSSppKs s CCCCCCuuus s PPPPPPuuus s TTTTTToCs s s s dd/mm/yys s hh:mm:ss is the Log Number. -
Page 40: Glp Data Format
If the Altitude or Pressure Correction was switched off at the time of the last air calibration, then neither is displayed. 2. pH Asymmetry and pH Slope calibration data are only sent when the pH mode of the WP-91 is switched on. -
Page 41: Importing Data Into Microsoft Excel
Page 41 13.8 Importing Data into Microsoft Excel The following procedure details the method for importing a WP-91 text ® ® data file into Microsoft Excel ® ® and select File → Open Start Microsoft Excel In the “Files of type:” pull-down box, choose “Text Files (*prn; *.txt;... - Page 42 Temperature. Press “Next >” after the column breaks have been inserted. 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.
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Page 43: Battery Saver Function
Page 43 14. Battery Saver Function The WP-91 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 44: Recharging The Battery
5.60 volts. The battery should be recharged at this point. If the battery is not recharged, the WP-91 will switch itself off when the battery drops below 5.00 volts. To recharge the battery…... -
Page 45: Clock Function
Press to quit without resetting the clock. Note The WP-91 does not test for a valid day of the month when setting the clock (eg: attempting to enter 31/02/04 is not corrected). 16.2 Displaying or Hiding the Clock The time is normally displayed along with the Dissolved Oxygen, pH and Temperature readings. -
Page 46: Selecting Ph6.88 Or Ph7.00 As The Primary Buffer
Page 46 17. Selecting pH6.88 or pH7.00 as the Primary Buffer The WP-91 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 47: Initialising The Wp-91
MUST ReCalibrate Oxy. pH/mV Temp. (The “s” after WP-91 is shown when the RS232 serial port option is fitted) 4. The meter then displays Dissolved Oxygen, pH and Temperature. Note that the decimal points have been replaced with a ∗, to indicate that the unit requires recalibration. -
Page 48: Troubleshooting
20.1 General Errors Error Message Possible Causes Remedy The EEPROM chip which The unit must be returned to Factory Cal. contains the factory TPS for service. Failed calibration information has failed. User calibration settings Re-calibrate the Memory Failed have been lost or instrument…... -
Page 49: Dissolved Oxygen Troubleshooting
5. Sensor is faulty. Return sensor to factory for repair or replacement Blackened Silver Sensor has been exposed to Return to the TPS factory for anode wire sulphides or other chemical cleaning and service. poisoning. Tarnished or Sensor has been chemically... -
Page 50: Ph And Mv Troubleshooting
1. Incorrect primary buffer. Ensure that you are using fails (Slope is less the primary buffer for which than 85.0%). the WP-91 has been set (see section 17). 2. Glass bulb not clean. Clean glass bulb as per instructions supplied with the sensor. -
Page 51: Temperature Troubleshooting
Page 51 pH and mV Troubleshooting, continued… Inaccurate Reference junction blocked. Clean reference junction, as readings, even per instructions supplied when calibration with the sensor. is successful. Displays 7.00 for Electrical short in connector. 1. Check connector. all solutions. Replace if necessary. 2. -
Page 52: Dissolved Oxygen Sensor Fundamentals
Page 52 21. Dissolved Oxygen Sensor Fundamentals The sensor used, is the amperometric type of Clark Sensor and is suitable for the measurement of oxygen pressures in the range 0 to 100 cm of mercury. While the probe actually reads partial pressure of oxygen, the circuit is calibrated to be read in percentage saturation or parts per million (Milligrams/litre). -
Page 53: Maintenance Of The Membrane
Page 53 21.2 Maintenance Of The Membrane The membrane does not require replacement as long as it remains intact. If punctured or suspected of leaking around the edges, it must be replaced. To replace the membrane, please see the separate instruction leaflet supplied with the EDYSI sensor. -
Page 54: Notes On Units Of Dissolved Oxygen
Page 54 21.4 Notes On Units Of Dissolved Oxygen The terms "Oxygen Concentration" and "Oxygen Partial Pressure" frequently give rise to some confusion. • Oxygen Concentration is the absolute quantity of oxygen present per unit mass of the liquid. • Oxygen Partial Pressure is the oxygen fraction of the total pressure of all of the gases present. -
Page 55: Equilibrium Conditions
(a) is achieved AUTOMATICALLY. (b) To provide the mass units (ppM) readout (so popular due to the Winkler process used in the past), the WP-91 Meter has Solubility Correction via an additional temperature sensor in the sensor. (c) Salinity correction is provided by manual entry of the salinity of the sample. -
Page 56: Velocity Past The Membrane
Page 56 21.6 Velocity Past The Membrane Workers have shown that the relationship between the diffusion current (oxygen current) and the external velocity of the liquid is expotential. Some workers using thicker membranes have shown even less dependence of the diffusion current on liquid velocity. Because of the expotential nature of the relationship, very considerable changes in velocity have to be made before noticing any change in the diffusing current once the flow is sufficiently high. -
Page 57: Ph Sensor Fundamentals
Page 57 22. 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 58: Slope Of A Ph Sensor
Page 58 22.2 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 C As the pH goes down, an ideal pH sensor produces +59mV/pH unit. -
Page 59: Ph Temperature Compensation
1. Calibrate the WP-91, as per section 5. 2. Dilute 1 part of pH6.88 buffer with 9 parts of distilled water. 3. Measure the pH of the diluted buffer. The result should be 7.06 +/- 0.02 pH. -
Page 60: Determining If A Ph Meter Or An Sensor Is Faulty
7. The reading should steadily drift away from 7.00 (either up or down) at a rate of approximately 0.10 pH or less every 3 seconds. If the drift rate is faster than this, then input circuitry of the WP-91 is faulty and requires servicing. -
Page 61: Warranty
(3) months. There are no express or implied warranties which extend beyond the face hereof, and TPS Pty. Ltd. is not liable for any incidental or consequential damages arising from the use or misuse of this equipment, or from interpretation of information derived from the equipment. - Page 62 Page 62 To obtain this service, please follow this procedure: Return the instrument AND ALL SENSORS to TPS freight pre-paid and insured in its original packing or suitable equivalent. INSIST on a proof of delivery receipt from the carrier for your protection in the case of shipping claims for transit loss or damage.
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