TPS WP-80 User manual

Congratulations !
You have purchased the latest in Handheld pH-mV-Temperature
instrumentation. We trust that your new WP-80 will give you many years
of reliable service.
The WP-80 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-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. Main Section
The main section of the handbook provides complete details of the
WP-80, 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-80
pH-mV-Temp. Meter
Version : 3.51
Date : 02/07/2003
Author : MS

Page 1
TPS Pty Ltd
ABN 30 009 773 371
4 Jamberoo Street
Springwood, Brisbane,
Australia, 4127
Phone : [phone]
International : 61 7 32 900 400
Fax : [phone]
International : 61 7 3808 4871
Email : [email protected]
Web : www.tps.com.au

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Contents
1. Introduction .....................................................................................4
1.1 WP-80 Display and Controls............................................................... 4
1.2 Unpacking Information........................................................................ 6
1.3 Specifications..................................................................................... 7
2. WP-80 Menu Structure....................................................................9
3. Operating Modes...........................................................................10
3.1 Selecting pH, mV or Relative mV Mode ............................................ 10
4. pH Calibration................................................................................12
4.1 Calibration Procedure....................................................................... 12
4.2 Calibration Notes.............................................................................. 14
4.3 Calibration Messages....................................................................... 14
5. mV Calibration...............................................................................15
6. Relative mV Calibration ................................................................15
6.1 Notes ............................................................................................... 16
7. Temperature Calibration...............................................................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 into the Notepad............................................... 23
9.2 Recalling Records from the Notepad................................................. 23
9.3 Erasing Records from the Notepad................................................... 24
9.4 Printing Records from the Notepad to the RS232 Port....................... 24
10. Automatic Datalogging..............................................................25

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11. RS232 Port.................................................................................27
11.1 Setting the Baud Rate................................................................... 27
11.2 Sending Readings to the RS232 Port............................................ 27
11.3 RS232 Configuration..................................................................... 27
11.4 Communication and Statistical Software ....................................... 27
11.5 Commands................................................................................... 28
11.6 Data Format ................................................................................. 29
12. Battery Saver Function.............................................................31
13. Clock Function ..........................................................................34
13.1 Setting 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 instrument or electrode is faulty ......................... 45
18.4 Instrument firmware version number. ............................................ 45

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1. Introduction
1.1 WP-80 Display and Controls

Page 5
Press to record readings into memory. See section 9.1.
Also used to select primary and secondary buffers for automatic
buffer recognition. See section 14.
Press to show or hide the date and time. See section 13.2.
Press to start or stop automatic logging. See section 10.
Alternatively, press to transmit current reading plus date and time to
the RS232 port (optional) See section 11.2.
Press to zero relative mV, when relative mV mode 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 the WP-80 at turn-on. See
section 15.
Switches the WP-80 on and off.
Display
32 character alpha-numeric display with user-friendly menu and
prompting system. Shows pH/mV and temperature simultaneously.
Date and time can also be displayed.

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1.2 Unpacking Information
Before using your new WP-80, please check that the following
accessories have been included:
Part No
1. WP-80 pH-mV-Temperature Instrument.................................121109
2. Combination pH Sensor.........................................................121207
3. Temperature/ATC Sensor......................................................121247
4. pH6.88 Buffer, 200mL............................................................121306
5. pH4.00 Buffer, 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. Solar Panel...........................................................................130012
Other spares:
1. 6V NiMH Battery....................................................................130038
2. RS232 Interface Cable...........................................................130041

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1.3 Specifications
pH
Range.......................................0 to 14.00 pH
Resolution...............................0.01 pH
Accuracy..................................±0.01 pH
mV
Range.......................................0 to ±500.0 and 0 to ±1500 mV (auto-
ranging)
Resolution...............................0.15 and 1 mV
Accuracy..................................±0.3 and ±1 mV
Temperature
Range.......................................-10.0 to +120.0 oC
Resolution...............................0.1 oC
Accuracy..................................±0.2 oC
General Specifications
Temperature Compensation .....0 to 100.0 oC, automatic or manual
pH Asymmetry Range...............-1.00 to 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.
Battery Saver............................On : Auto switch-off after 5 minutes
Off : Continuous use
Bar Graph display of battery charge level.
Readout of battery voltage available for
troubleshooting.

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Good Laboratory Practices.......Date, Time and Value of last asymmetry
and last slope calibration are stored, 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 oC
Humidity : 0 to 90 % R.H.

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2. WP-80 Menu Structure
A detailed breakdown of the menu system of the WP-80 is shown below.
This diagram provides a quick reference for the menu functions available
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.

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3. Operating Modes
3.1 Selecting pH, mV or Relative mV Mode
To select pH, mV or Relative mV mode…
1. Select the Mode menu ( , then →→ F3:Mode)…
F1:pH F2:mV
F3:Rel mV
2. Press to select pH mode.
Press to select mV mode.
Press to select Relative mV mode.
Press to quit and retain the current selection.
3.1.1 pH Mode
Displays 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 1oC 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
31/12 12:00:00
If the temperature probe is unplugged, no temperature value is
displayed…
1000mV
31/12 12:00:00

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3.1.3 Relative mV Mode
Displays Relative mV and Temperature readings simultaneously.
Press to alternatively show absolute mV or the date and time. For
example…
1000mVR 25.0
660mV F4:Zeros
ÖÖ
1000mVR 25.0
31/12 12:00:00
If the temperature probe is unplugged, no temperature value is
displayed…
1000mVR
660mV F4:Zeros
ÖÖ 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 16.1).

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4. pH Calibration
A “ ∗” in place of the decimal point indicates that the pH readout is not
calibrated, or a past calibration has failed. The “ ∗” will be removed once
a full two-point pH calibration has been successfully performed.
4.1 Calibration Procedure
1. Plug the pH sensor into the pH/mV socket and the temperature
sensor into the Temperature socket.
2. Switch the meter on.
3. Ensure that you are using buffers which have been selected for
automatic 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 water and blot
them dry.
8. Place both electrodes 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.
DO NOT place the electrodes directly into the buffer bottle.

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9. Select pH Calibration ( →→ F1:Cal. →→ F1:pH).
10. When the reading has stabilised, press the key to calibrate. If a 1
point calibration has been performed, the " ∗∗ " will not be removed
until a full 2 point calibration has been performed.
11. Rinse the pH and Temperature electrodes in distilled water and blot
them dry.
12. Place both sensors into a small sample of 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 be replaced by a decimal point, if calibration was
successful.
15. The WP-80 is calibrated and ready for use in this mode. Discard the
used samples of buffer.

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4.2 Calibration Notes
1. A 1-point calibration should be performed at least weekly. In
applications where the electrode junction can become blocked, such
as dairy products, mining slurries etc, a 1-point calibration may have to
be done daily.
2. A full 2-point calibration should be performed at least monthly. Of
course, more frequent calibration will result in greater confidence in
results.
3. All calibration information is retained in memory when the WP-80 is
switched off, even when the battery is removed. This information can
be recalled or printed later using the GLP function (see section 8).
4. The WP-80 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.
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. For
example:
1 Point Cal.Fail
Asy= 1.50pH Hi or : 1 Point Cal.Fail Asy=-1.50pH Lo
3. If a 2-point calibration has been successfully performed, the WP-80 will
display the following message, and the asymmetry and slope of the
electrode. For example…
2 Point Cal.OK
Asy= 0.10pH then : 2 Point Cal.OK Slope=100.0%
4. If a 2-point calibration has failed, the WP-80 will display the following
message, and the failed slope value of the electrode. For example…
2 Point Cal.Fail
Slope=130.0% Hi or : 2 Point Cal.Fail Slope= 70.0% Lo

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5. mV Calibration
The mV section is factory calibrated. There is no user-calibration facility
for this mode.
6. Relative mV Calibration
Select Relative mV mode when measurements relative to a known
standard are required. Calibration of the Relative mV mode is simply a
matter of zeroing the reading when the sensor is in the known standard.
1. Plug the Redox sensor into the pH/mV socket. Temperature
compensation is not applied in Relative mV 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
Ö1000mVR 25.0
31/12 12:00:00
Press to alternate between absolute mV or the clock on the bottom
line.
4. Remove the wetting cap from the Redox sensor.
5. Rinse the sensor in distilled water and blot dry.
6. Place the Redox sensor into a sample of the known standard. Ensure
that the platinum tip and reference junction are both covered, as per
the diagram over the page.

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7. When the reading has stabilised, press the key to zero the Relative
mV reading. The Relative mV reading will now be zero, and the
absolute mV reading will remain unchanged. For example…
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)

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7. Temperature Calibration
A “ ∗” in place of the decimal point indicates that the Temperature
readout is not calibrated, or a past calibration has failed. The “ ∗” will be
removed once Temperature has been successfully calibrated.
7.1 Calibration Procedure
1. Plug the temperature sensor into the Temperature socket.
2. Switch the meter on.
3. Place the sensor into a beaker of room temperature water, alongside
a good quality mercury thermometer. Stir the probe and the
thermometer gently to ensure an even temperature throughout the
beaker.
4. Select Temperature Calibration ( →→ F1:Cal. →→ 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 key to abort temperature calibration.
7.2 Calibration Notes
1. Temperature calibration information is retained in memory when the
WP-80 is switched off, even when the battery is removed. This
information can be recalled later using the GLP function (see section
8).
2. Temperature does not need to be recalibrated unless the
Temperature probe is replaced or the meter is initialised.

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7.3 Calibration Messages
1. If a temperature calibration has been successfully performed, 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

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7.4 Manual Temperature Setting
If the temperature sensor is not connected, the temperature of the sample
solution must be set manually for accurate pH measurements. A separate
thermometer will be 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 setting.