TPS WP-81T User manual

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 : [phone]
International : 61 7 32 900 400
Fax : [phone]
International : 61 7 3808 4871
E-mail : [email protected]
Model WP-81T
Conductivity-TDS-
pH-Temp. Meter
Handbook Version : 1.0
Date : 04 Aug 97
Author : MS

Page 2Contents
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 .......................................................................................12
5. TDS Calibration................................................................................13
5.1 Calibration Procedure.......................................................................................13
5.2 Calibration Notes .............................................................................................14
5.3 Calibration Messages .......................................................................................14
6. pH Calibration .................................................................................. 15
6.1 Calibration Procedure.......................................................................................15
6.2 Calibration Notes .............................................................................................16
6.3 Calibration Messages .......................................................................................16
7. Temperature Calibration .................................................................17
7.1 Calibration Procedure.......................................................................................17
7.2 Calibration Notes .............................................................................................17
7.3 Calibration Messages .......................................................................................17
7.4 Manual Temperature Setting............................................................................18
8. Good Laboratory Practices (GLP)..................................................19
8.1 To recall GLP information on the display.........................................................19
8.2 Failed Calibration.............................................................................................20
8.3 Printing GLP Information to the RS232 Port....................................................20
8.4 Instrument Serial Number................................................................................21
8.5 Additional GLP Features..................................................................................21
9. Notepad Function ............................................................................ 22
9.1 Recording Readings into the Notepad...............................................................22
9.2 Recalling Records from the Notepad.................................................................22
9.3 Erasing Records from the Notepad ...................................................................22
9.4 Printing Records from the Notepad to the RS232 Port ......................................23

Page 3
10. Automatic Datalogging..................................................................24
11. RS232 Port.....................................................................................25
11.1 Setting the Baud Rate.....................................................................................25
11.2 Sending Readings to the RS232 Port ..............................................................25
11.3 RS232 Configuration......................................................................................25
11.4 Communication and Statistical Software ........................................................25
11.5 Commands.....................................................................................................26
11.6 Data Format...................................................................................................27
12. Battery Saver Function..................................................................28
13. Clock Function...............................................................................29
13.1 Setting the Clock............................................................................................29
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................................................................................................33
18.2 Conductivity and TDS Troubleshooting..........................................................34
18.3 pH Troubleshooting........................................................................................36
18.4 Temperature Troubleshooting.........................................................................37
19. Warranty.........................................................................................38
20. Appendices ....................................................................................40
20.1 Care, Cleaning and Maintenance of Conductivity Electrodes..........................40
20.2 Replatinising Conductivity Electrodes ............................................................41
20.3 pH Electrode Fundamentals............................................................................42
20.4 Checking the reference junction of a pH electrode. .........................................44
20.5 Determining if an instrument or pH sensor is faulty........................................45

Page 4
1. Introduction
1.1 WP-81T Display and Controls
¬ -
´
°
® ¯
±
² ³

Page 5
¬
Press to record readings into memory. See section 9.1.
Also used to select pH6.88 or pH7.00 as the primary buffer. See section 15.
-
Press to show or hide the date/time or temperature. See section 13.2.
Also used to select k=0.1 or k=10 sensor, when standard k=1 sensor is not
being used.
®
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.
¯
Only used within the menu system on the WP-81T.
°
Press to access the user-friendly menu system which makes the WP-81T a
breeze to operate.
±and ³
The and keys are used for calibrating temperature readout (section
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).
The key is also used to intialise the WP-81T at turn-on. See section 16.
²
Switches the WP-81T on and off.
´Display
32 character alpha-numeric display with user-friendly menu and prompting
system. Shows Conductivity/TDS, pH and Temperature simultaneously. Date
and time can also be displayed.

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. 2 ppK TDS Standard, 200mL 122307
6. pH6.88 Buffer, 200mL 121306
7. pH4.00 Buffer, 200mL 121381
8. Battery charger 130037
9. WP-81T Handbook 130050
Options that may have been ordered with your WP-81T:
1. k=10/ATC/Temperature Sensor, 5m cable 122220
2. k=0.1/ATC/Temperature Sensor, 1m cable 122229
3. RS232 Serial Interface Option (includes cable) 130039
4. Hard Carry Case 130059
5. Battery charger lead for 12V cigarette lighter socket 130046
6. Solar Panel 130012
7. RS232 Printer 130031
Other spares:
1. 6V NiCad Battery 130038
2. RS232 Interface Cable 130041

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
Accuracy :±0.2% of full scale of selected range
TDS
Ranges :5 ranges, with automatic range selection and
linearising software.
k=0.1 Sensor.............. 1.000 ppM to 10.00 ppK
k=1.0 Sensor.............. 10.00 ppM to 100.0 ppK
k=10 Sensor............... 100.0 ppM to 1000 ppK
Resolution :0.1% of selected range
Accuracy :±0.3% of full scale of selected range
pH
Range :0 to 14.00 pH
Resolution :0.01 pH
Accuracy :±0.01 pH
Temperature
Range :-10.0 to 120.0 oC (Sensor limit 60 oC)
Resolution :0.1 oC
Accuracy :±0.2 oC

Page 8
General Specifications
Temperature Compensation :Automatic, 0 to 100 oC,
or manual for pH, 0 to 99.0 oC.
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 :85.0 to 105%
Temp. Sensor Offset Range :-10.0oC to +10.0oC
Auto Standard Recognition :Cond. :150 µS/cm, 1413 µS/cm, 2.76 mS/cm,
12.88 mS/cm, 58.0 mS/cm
TDS :69.5 ppM, 2.00 ppK, 8.00 ppK, 36.0 ppK
pH :4.00, 6.88, 7.00, 9.23
Memory :150 readings including date and time
Automatic Logging :User-set for one reading every 1 to 90 seconds or
minutes.
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.
Good Laboratory Practices :Date, Time and Value of last Conductivity, TDS,
pH and Temperature calibration are stored, and can
be recalled or sent to the optional RS232 port at any
time.
Power :6V NiCad 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.

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:
F1 :Press to record current data plus date and time into memory.
F2 :Press to show or hide date and time.
F3 :Press to start and stop automatic logging.
If logging period is set to zero, press to transmit current reading plus
date and time to the RS232 port.
Menu :Press to access the user-friendly menu system, as detailed below.
F1:Cal. F1:Cond./TDS
F2:pH
F3:Temp
F2:Notepad F1:Recall
F2:Erase
F3:Print (if RS232 option fitted)
F4:Prog. F1:Min
F2:Sec
↑↓:Set Period
F3:Mode F1:Conductivity
F3:TDS
F4:Setup F1:Batt F1:OFF
F2:ON
F2:Clock
F3:GLP F1:Recall
F3:Print
F4:Baud F1:300
(if RS232 F2:1200
option fitted) F3:9600

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.
eg : 2.76mS 7.00pH
25.0oc12:00:00
If the temperature probe is unplugged, the manual temperature setting is
displayed with 1oC resolution.
eg: 2.76mS 7.00pH
Man25oc12:00:00
2. F2:TDS
Displays TDS, pH and Temperature readings simultaneously.
See section 13.2 for details on how to show or hide the date and time.
eg: 36.0ppK 7.00pH
25.0oc12:00:00
If the temperature probe is unplugged, the manual temperature setting is
displayed with 1oC resolution.
eg: 36.0ppK 7.00pH
Man25oc12:00:00
3. Notes
1) The decimal point is replaced by a ∗∗ if a Conductivity, TDS, pH or
Temperature calibration has failed (sections 4.1, 5.1, 6.1 & 7.1), or if the
unit is initialised (section 16).

Page 11
4. 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.
3. Select Conductivity Mode. →F3:Mode →F1:Conductivity
4. Rinse the Conductivity electrode in distilled water. Shake off as much water as
possible. Blot the outside of the electrode dry. DO NOT BLOT THE
ELECTRODE WIRES.
5. Zero Calibration
Let the electrode dry in air.
Select Conductivity Calibration. →F1:Cal. →F1:Cond.
6. When the reading has stabilised at or near zero, press the key to calibrate.
The ∗will not be removed after a zero calibration.
7. Standard Calibration
Allowable Conductivity standards are 150µS/cm, 1413µS/cm, 2.76mS/cm,
12.88mS/cm and 58.0mS/cm, and should be selected according to your range
of interest.
If the WP-81T does not recognise the standard, it will display the message,
“NOT STD” during calibration. Calibration will fail if this message is
displayed.
Place the electrode into a sample of Conductivity standard, so that it is
immersed at least to the vent hole in the white plastic cover. The white
plastic cover MUST be in place for correct readings.
DO NOT place the electrode directly into the bottle of standard. Discard the
used sample of standard after use. It is advisable to use a narrow sample vessel
to minimise the use of standard solution.
8. Select Conductivity Calibration. →F1:Cal. →F1:Cond.
9. When the reading has stabilised, press the key to calibrate.
The ∗will now be replaced by a decimal point, if calibration was successful.
10.The WP-81T is now calibrated for Conductivity and is ready for use in this
mode.

Page 12
4.2 Calibration Notes
1. A Zero calibration should be performed at least monthly. In low conductivity
applications (where a zero error is particularly significant) a zero calibration
may have to be done weekly.
2. A Standard calibration should be performed at least weekly. Of course, more
frequent calibration will result in greater confidence in results.
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.
4. All calibration information is retained in memory when the WP-81T is
switched off, even when the battery is removed. This information can be
recalled or printed later using the GLP function (see section 8).
5. The WP-81T 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.
6. If the WP-81T does not recognise the standard, it will display the message,
“NOT STD” during calibration. Calibration will fail if this message is
displayed.
4.3 Calibration Messages
1. If a Zero calibration has been successfully performed, the WP-81T will display
the following message, and the zero value of the electrode.
eg: Calibrate OK
Zero= 0.00uS
2. If a Standard calibration has been successfully performed, the WP-81T will
display the following message, and the k factor of the electrode.
eg: Calibrate OK
k= 1.0
3. If a Standard calibration has failed, the WP-81T will display the following
message, and the failed k factor of the electrode.
eg: Calibrate Fail
k= 1.5

Page 13
5. 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.
3. Select TDS Mode. →F3:Mode →F3:TDS
4. Rinse the Conductivity electrode in distilled water. Shake off as much water as
possible. Blot the outside of the electrode dry. DO NOT BLOT THE
ELECTRODE WIRES.
5. Zero Calibration
Let the electrode dry in air.
Select TDS Calibration. →F1:Cal. →F1:TDS
6. When the reading has stabilised at or near zero, press the key to calibrate.
The ∗will not be removed after a zero calibration.
7. Standard Calibration
Allowable TDS standards are 69.5ppM, 2.00ppK, 8.00ppK, and 36.0ppK, and
should be selected according to your range of interest.
If the WP-81T does not recognise the standard, it will display the message,
“NOT STD” during calibration. Calibration will fail if this message is
displayed.
Place the electrode into a sample of TDS standard, so that it is immersed at
least to the vent hole in the white plastic cover. The white plastic cover
MUST be in place for correct readings.
DO NOT place the electrode directly into the bottle of standard. Discard the
used sample of standard after use. It is advisable to use a narrow sample vessel
to minimise the use of standard solution.
8. Select TDS Calibration. →F1:Cal. →F1:TDS
9. When the reading has stabilised, press the key to calibrate.
The ∗will now be replaced by a decimal point, if calibration was successful.
10.The WP-81T is now calibrated for TDS and is ready for use in this mode.

Page 14
5.2 Calibration Notes
1. A Zero calibration should be performed at least monthly. In low TDS
applications (where a zero error is particularly significant) a zero calibration
may have to be done weekly.
2. A Standard calibration should be performed at least weekly. Of course, more
frequent calibration will result in greater confidence in results.
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.
4. All calibration information is retained in memory when the WP-81T is
switched off, even when the battery is removed. This information can be
recalled or printed later using the GLP function (see section 8).
5. The WP-81T 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.
6. If the WP-81T does not recognise the standard, it will display the message,
“NOT STD” during calibration. Calibration will fail if this message is
displayed.
5.3 Calibration Messages
1. If a Zero calibration has been successfully performed, the WP-81T will display
the following message, and the zero value of the electrode.
eg: Calibrate OK
Zero= 0.00ppM
2. If a Standard calibration has been successfully performed, the WP-81T will
display the following message, and the k factor of the electrode.
eg: Calibrate OK
k= 1.0
3. If a Standard calibration has failed, the WP-81T will display the following
message, and the failed k factor of the electrode.
eg: Calibrate Fail
k= 1.5

Page 15
6. pH Calibration
6.1 Calibration Procedure
1. Plug the pH sensor into the pH socket. Temperature measurements are made
via the Conductivity sensor, so this needs to be connected to the
Conductivity/Salinity socket for Automatic Temperature Compensation.
2. Switch the meter on.
3. 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.
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).
Place both electrodes into a small sample of pH6.88 (or pH7.00) buffer, so
that the bulb and reference junction are both covered.
DO NOT place the electrodes directly into the buffer bottle.
7. Select pH Calibration. →F1:Cal. →F2:pH
8. 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.
9. Rinse the pH and Conductivity electrodes in distilled water and blot them dry.
10. Place both sensors into a small sample of pH4.00 or pH9.23 Buffer, so that
the bulb and reference junction are both covered. 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.
11. Select pH Calibration →F1:Cal. →F2:pH
12. When the reading has stabilised, press the key to calibrate. The ∗will now
be replaced by a decimal point, if calibration was successful.
13. The WP-81T is calibrated for pH and is ready for taking pH measurements.
Discard the used samples of buffer.

Page 16
6.2 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-81T 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-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.
6.3 Calibration Messages
1. If a 1-point calibration has been successfully performed, the WP-81T will
display the following message, and the asymmetry of the electrode.
eg: 1 Point Cal.OK
Asy= 0.10pH
2. If a 1-point calibration has failed, the WP-81T will display the following
message, and the failed asymmetry value of the electrode.
eg: 1 Point Cal.Fail or: 1 Point Cal.Fail
Asy= 1.50 Hi Asy=-1.50 Lo
3. If a 2-point calibration has been successfully performed, the WP-81T will
display the following message, and the asymmetry and slope of the electrode.
eg: 2 Point Cal.OK then: 2 Point Cal.OK
Asy= 0.10pH Slope=100.0%
4. If a 2-point calibration has failed, the WP-81T will display the following
message, and the failed slope value of the electrode.
eg: 2 Point Cal.Fail or: 2 Point Cal.Fail
Slope=130.0% Hi Slope= 70.0% Lo

Page 17
7. Temperature Calibration
7.1 Calibration Procedure
1. Plug the Conductivity/Temperature sensor into the Conductivity/Salinity
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 sensor and the thermometer gently to
ensure an even temperature throughout the beaker.
4. Select Temperature Calibration. →F1:Cal. →F3: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.
eg: →→ 25.0←← 20∗∗0oc
↑↑↓↓: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.
The ∗will now be replaced by a decimal point, if calibration was successful.
Alternatively, press the key to abort temperature calibration.
7.2 Calibration Notes
1. Temperature calibration information is retained in memory when the WP-81T
is switched off, even when the battery is removed. This information can be
recalled or printed later using the GLP function (see section 8).
2. Temperature does not need to be recalibrated unless the sensor is replaced or
the meter is initialised.
7.3 Calibration Messages
1. If a temperature calibration has been successfully performed, the WP-81T will
display the following message and the offset value of the probe.
eg: Calibrate OK
Offset= 1.0oc
2. If a temperature calibration has failed, the WP-81T will display the following
message, and the failed offset value of the probe.
eg: Calibrate Fail
Offset= 10.5oc

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.
NOTE: The Conductivity sensor has a separate sensor built in for automatic
temperature compensation for Conductivity and TDS.
1. Switch the meter on.
2. Measure the temperature of the sample.
3. Select Temperature Calibration →F1:Cal. →F3:Temp
4. The current temperature setting is now displayed.
eg: →→ 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.

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.
8.1 To recall GLP information on the display
1. Switch the meter on.
2. Select the GLP menu. →F4:Setup →F3:GLP
3. Select recall. F1:Recall
4. The instrument model, firmware version number, and instrument serial
number are displayed, along with a prompt describing how to scroll through
the GLP information.
eg: WP81T V1.0 R1234
↓↓:More ↑↑:Back
5. Press the key to sequentially scroll through the GLP information for all
parameters. Press the key to scroll back to previous data. The sequence of
information displayed is shown below. Press to abort at any time.
WP81T V1.0 R1234
↓↓:More ↑↑:Back
Cond Zero 0.00uS
@31/12/97 11:00
k=1.00 @2.76mS
@31/12/97 11:10
TDS Zero 0.00 ppM
@31/12/97 11:20
k=1.00 @2.00ppK
@31/12/97 11:30
pH Asy 0.10pH
@31/12/97 11:40
pH Slope 100.0%
@31/12/97 11:50
Temp Offset 1.0oc
@31/12/97 12:00
Exit

Page 20
8.2 Failed Calibration
If calibration has failed, the GLP function will reset the date and time to zero. The
WP-81T still shows the results of the last successful calibration.
eg: Cond Zero 0.00uS k=1.00
@00/00/00 00:00 @00/00/00 00:00
Asy 0.10pH Slope 100.0% Temp Offset 1.0oc
@00/00/00 00:00 @00/00/00 00:00 @00/00/00 00:00
Note that these calibration values are still used if further measurements are taken
without recalibrating.
8.3 Printing GLP Information to the RS232 Port
The GLP information stored in the instrument’s memory can be sent to a printer or
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:
→F4:Setup →F3:GLP →F3:Print
4. The GLP information is sent to the RS232 port in formatted ASCII text.
eg: WP81T V1.0 R1234 @ 31/12/97 12:00
Conductivity Zero= 0.00uS @ 31/12/97 11:00
Conductivity k= 1.00 @ 2.76mS @ 31/12/97 11:10
TDS Zero= 0.00ppM @ 31/12/97 11:20
TDS k= 1.00 @ 36.0ppK @ 31/12/97 11:30
pH Asy= 0.00pH @ 31/12/97 11:40
pH Slope= 100.0% @ 31/12/97 11:50
Temperature Offset= 1.0oC @ 31/12/97 12:00
ENDS