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Congratulations !
You have purchased the latest in Handheld Conductivity-TDS-pH-Temperature
instrumentation. We trust that your new WP-81T will give you many years of
reliable service.
The WP-81T 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-81T. It also contains a full listing of all of the items that you should
have received with your WP-81T. 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-81T, 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
: tpsweb@tps-brisbane.com.au
Model WP-81T
Conductivity-TDS-
pH-Temp. Meter
Handbook Version : 1.0
Date
:
04 Aug 97
Author
: MS
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Summary of Contents for TPS WP-81T
- Page 1 The introduction has a diagram and explanation of the display and controls of the WP-81T. It also contains a full listing of all of the items that you should have received with your WP-81T. 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
1. Introduction..................4 1.1WP-81T Display and Controls................4 1.2 Unpacking Information ..................6 1.3 Specifications ..................... 7 2. WP-81T Menu Structure ..............9 3. Operating Modes ................10 4. Conductivity Calibration..............11 4.1 Calibration Procedure..................11 4.2 Calibration Notes ..................... 12 4.3 Calibration Messages .................. - Page 3 13.2 Displaying or Hiding the Clock ..............29 14. Selecting k=0.1 or k=10 Sensors ..........30 15. Selecting pH6.88 or pH7.00 as the Primary Buffer ...... 31 16. Initialising the WP-81T..............32 17. Instrument firmware version number........... 32 18. Troubleshooting ................33 18.1 General Errors....................
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Page 4: Introduction
Page 4 1. Introduction 1.1 WP-81T Display and Controls ´ ¬ ® ¯ ° ± ² ³... - Page 5 7.1), setting the 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). key is also used to intialise the WP-81T at turn-on. See section 16. ² Switches the WP-81T on and off.
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Page 6: Unpacking Information
Page 6 1.2 Unpacking Information Before using your new WP-81T, please check that the following accessories have been included: Part No 1. WP-81T Conductivity-TDS-pH-Temp. Instrument 191140 2. k=1/ATC/Temperature Sensor, 1m cable 122201 3. Combination pH Sensor 121207 4. 2.76mS/cm Conductivity Standard, 200mL 122306 5. -
Page 7: Specifications
Page 7 1.3 Specifications Conductivity Ranges : 5 ranges, with automatic range selection. k=0.1 Sensor..2.000 µS/cm to 20.00 mS/cm k=1.0 Sensor..20.00 µS/cm to 200.0 mS/cm k=10 Sensor..200.0 µS/cm to 2000 mS/cm Resolution : 0.05% of selected range : ±0.2% of full scale of selected range Accuracy Ranges... - Page 8 Page 8 General Specifications Temperature Compensation : Automatic, 0 to 100 or manual for pH, 0 to 99.0 Cond. Sensor Span Range : k=0.1 Sensor : k=0.075 to k=0.133 k=1.0 Sensor : k=0.75 to k=1.33 k=10 Sensor : k=7.5 to k=13.3 pH Asymmetry Range : -1.00 to 1.00 pH pH Slope Range...
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Page 9: Wp-81T Menu Structure
Page 9 2. WP-81T Menu Structure A detailed breakdown of the menu system of the WP-81T is shown below. This diagram provides a quick reference for the menu functions available for the WP-81T. 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: Operating Modes
Page 10 3. Operating Modes The WP-81T has two operating modes : Conductivity and TDS. To select a mode, access the mode menu by pressing , then F3:Mode. 1. F1:Conductivity Displays Conductivity, pH and Temperature readings simultaneously. See section 13.2 for details on how to show or hide the date and time. -
Page 11: Conductivity Calibration
4.1 Calibration Procedure 1. Plug the Conductivity sensor into the Conductivity/Salinity socket. If a k=0.1 or k=10 sensor is being used, ensure that the WP-81T is set to the correct k factor before using the instrument (see section 14). 2. Switch the meter on. -
Page 12: Calibration Notes
3. Conductivity and TDS calibration data is stored separately in memory. Ensure that the WP-81T has been correctly calibrated for the mode in which it will be used. The WP-81T does not require recalibration when alternating between Conductivity and TDS modes, providing the instrument has been correctly calibrated for both. -
Page 13: Tds Calibration
5.1 Calibration Procedure 1. Plug the Conductivity sensor into the Conductivity/Salinity socket. If a k=0.1 or k=10 sensor is being used, ensure that the WP-81T is set to the correct k factor before using the instrument (see section 14). 2. Switch the meter on. -
Page 14: Calibration Notes
3. TDS and Conductivity calibration data is stored separately in memory. Ensure that the WP-81T has been correctly calibrated for the mode in which it will be used. The WP-81T does not require recalibration when alternating between TDS and Conductivity modes, providing the instrument has been correctly calibrated for both. -
Page 15: Ph Calibration
4. Remove the wetting cap from the pH sensor. 5. Rinse the pH and Conductivity sensors in distilled water and blot them dry. 6. Ensure that you are using the primary buffer for which the WP-81T has been set (see section 15). -
Page 16: Calibration Notes
This information can be recalled or printed later using the GLP function (see section 8). 4. The WP-81T 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 17: Temperature Calibration
Calibrate OK Offset= 2. If a temperature calibration has failed, the WP-81T will display the following message, and the failed offset value of the probe. Calibrate Fail Offset= 10.5... -
Page 18: Manual Temperature Setting
Page 18 7.4 Manual Temperature Setting If the Conductivity/TDS/Temperature sensor is not connected, and a temperature sensor is not used in its place, the temperature of the sample solution must be set manually for accurate pH measurements. A separate thermometer will be required for this. -
Page 19: Good Laboratory Practices (Glp)
Page 19 8. Good Laboratory Practices (GLP) The WP-81T keeps a record of the date and time of the last Conductivity, TDS, pH and Temperature calibrations as part of GLP guidelines. The zero and span values for Conductivity and TDS are stored separately. -
Page 20: Failed Calibration
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-81T RS232 cable is connected to the instrument and to the printer or PC. 3. Send the GLP information to the RS232 port: →... -
Page 21: Instrument Serial Number
Page 21 8.4 Instrument Serial Number In case the serial number that is fitted to the rear of the WP-81T is removed or becomes illegible, it is also available on the WP-81T display. • The serial number is displayed at turn-on, eg: WP-81T V1.0 R1234... -
Page 22: Notepad Function
To erase all records from the Notepad: → F2:Notepad 1. Select the Notepad menu 2. Select Erase from the menu F2:Erase 3. The WP-81T now asks if you are sure that you wish to erase all records. Erase, You Sure? F1:Yes F2:No 4. Press... -
Page 23: 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-81T are the same. If necessary, alter the baud rate of the WP-81T (see section 11.1). -
Page 24: Automatic Datalogging
, then the WP-81T will automatically log a record every 5 seconds. 5. If the optional RS232 port is fitted, the WP-81T will ask if the records are to be logged into the Notepad, or sent directly to the RS232 port. -
Page 25: Rs232 Port
11.2 Sending Readings to the RS232 Port Press to instantly send readings to the RS232 port whenever the WP-81T is in normal display mode. This function is disabled if the automatic logging period is set to greater than zero (see section 10). -
Page 26: Commands
Page 26 11.5 Commands The following commands can be sent from a PC to the WP-81T. Note that <cr> denotes carriage return and <lf> denotes a line feed. Action Command Notes Request current data ?D<cr> Returns the current Conductivity/ TDS, pH, Temperature, date and time from the WP-81T. -
Page 27: Data Format
LLLLs s DDDDDDUUUs s PPPPPPuuus s TTTTTToCms s dd/mm/yys s hh:mm:ss<cr> or B. Data is sent to the RS232 port by the WP-81T in the following format when it is sent by the WP-81T using the Print function (section 9.4) or the Instant Send function (section 11.2):... -
Page 28: Battery Saver Function
ENDS 12. Battery Saver Function The WP-81T 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 29: Clock Function
Notes 1. The WP-81T 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-81T does test for leap years. -
Page 30: Selecting K=0.1 Or K=10 Sensors
The WP-81T automatically recognises a k=1.0 sensor. The WP-81T does not automatically recognise k=0.1 or k=10 sensors. When a k=0.1 or k=10 sensor is used, the WP-81T must be set to the correct k factor before use. The following procedure describes how to select a k=0.1 or k=10 sensor. -
Page 31: Selecting Ph6.88 Or Ph7.00 As The Primary Buffer
Page 31 15. Selecting pH6.88 or pH7.00 as the Primary Buffer The WP-81T is factory set to automatically recognise pH6.88 as the primary buffer. However, some users may prefer to use pH7.00. The following procedure describes how to alternate between pH6.88 and pH7.00 as the primary buffer. -
Page 32: Initialising The Wp-81T
Page 32 16. Initialising the WP-81T If the calibration settings of the WP-81T exceed the allowable limits, the unit may need to be initialised to factory default values. This action may be required if the electrode is replaced. To initialise the WP-81T: 1. -
Page 33: Troubleshooting
Remedy Factory Cal. The EEPROM chip which The unit must be returned to Failed contains the factory TPS for service. • Conductivity and TDS calibration information has Handbook failed. readings will be accurate. only if used in same range in which unit was calibrated. -
Page 34: Conductivity And Tds Troubleshooting
Page 34 18.2 Conductivity and TDS Troubleshooting Symptom Possible Causes Remedy Unit fails to Calibration settings outside of Initialise the unit. See section calibrate, even with allowable limits due to new electrode. previous failed calibration. Unit attempts Span Electrode has Zero error. Thoroughly rinse electrode in calibration instead distilled water and allow to... - Page 35 Page 35 Conductivity and TDS Troubleshooting, continued... Standard calibration 1. White protective cover is The white protective cover fails, and k factor not fitted or upside down. MUST be fitted for correct is less than 0.075, readings. The vent hole must 0.75 or 7.5, be towards the cable end of the (depending on k...
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Page 36: Ph Troubleshooting
1. Incorrect primary buffer. Ensure that you are using the fails (Slope is less primary pH buffer for which than 85.0%). the WP-81T has been set (see section 15). 2. Glass bulb not clean. Clean glass bulb as per instructions supplied with the electrode. -
Page 37: Temperature Troubleshooting
Page 37 pH and mV Troubleshooting, continued... Inaccurate readings, Reference junction blocked. Clean reference junction, as per even when instructions supplied with the calibration is electrode. successful. Displays 7.00 for Electrical short in connector. 1. Check connector. Replace if all solutions. necessary. -
Page 38: 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 39 Page 39 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.) •...
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Page 40: Appendices
20.1 Care, Cleaning and Maintenance of Conductivity Electrodes 20.1.1 Care of Conductivity electrodes The conductivity section of the electrode supplied with your WP-81T consists of two platinum wires that are plated with a layer of “platinum-black”. This is quite a soft layer and is required for stable, accurate measurements. In time, the platinum-black layer may wear off in some applications, at which time the electrode will require replatinising (see section 20.2). -
Page 41: Replatinising Conductivity Electrodes
20.2 Replatinising Conductivity Electrodes There are several ways to replatinise Conductivity electrodes. 1. The simplest way is to return the electrode to the TPS factory. We can fully clean the electrode, replatinise it and test all aspects of its performance. -
Page 42: Ph Electrode Fundamentals
Page 42 20.3 pH Electrode Fundamentals A combination pH Electrode is two electrodes in one. The sensing membrane is the round or spear shaped bulb at the tip of the electrode. This produces a voltage that changes with the pH of the Solution. This voltage is measured with respect to the second part of the electrode, the reference section. - Page 43 Page 43 20.3.2 The Slope of a pH Electrode As mentioned above, a pH electrode produces 0 mV output at around 7.00 pH. As the pH goes up, an “ideal” pH electrode produces -59mV/pH unit at 25 C As the pH goes down, an ideal pH electrode produces +59mV/pH unit.
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Page 44: Checking The Reference Junction Of A Ph Electrode
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 pH section of the WP-81T, as per section 4.1. 2. Dilute 1 part of pH6.88 buffer with 9 parts of distilled water. -
Page 45: Determining If An Instrument Or Ph Sensor Is Faulty
Page 45 20.5 Determining if an instrument or pH sensor is faulty The following test can be performed to help determine if the WP-81T or the pH sensor is faulty. 1. Initialize the WP-81T (see section16). 2. Disconnect the pH electrode.
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