TPS 901-PH User manual

Congratulations !
You have purchased the latest in benchtop pH-mV-Temperature instrumentation.
We trust that your new 901-PH will give you many years of reliable service.
The 901-PH 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 901-PH. It also contains a full listing of all of the items that you should
have received with your 901-PH. 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 901-PH,
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
Email :[email protected]
Web Site :www.tpssite.com.au
Model 901-PH
pH-mV-Temp.
Meter
Handbook Version : 5
Date : 30-Aug-99
Author : MS

Page 1
Contents
1. Introduction..............................................................................................2
1.1 901-PH Display and Controls............................................................................2
1.2 901-PH Rear Panel Connectors..........................................................................2
1.3 901-PH Front Panel...........................................................................................3
1.4 Unpacking Information .....................................................................................4
1.5 Specifications....................................................................................................5
2. Operating Modes......................................................................................6
3. pH Calibration ..........................................................................................7
3.1 Calibration Procedure........................................................................................7
3.2 Calibration Notes ..............................................................................................8
3.3 Calibration Messages ........................................................................................9
4. mV Calibration........................................................................................ 10
5. Temperature Calibration........................................................................ 10
5.1 Calibration Procedure......................................................................................10
5.2 Calibration Notes ............................................................................................11
5.3 Calibration Messages ......................................................................................11
5.4 Manual Temperature Setting ...........................................................................12
6. RS232 Port.............................................................................................. 13
6.1 Setting the Baud Rate......................................................................................13
6.2 Sending Readings to the RS232 Port................................................................13
6.3 RS232 Configuration ......................................................................................14
6.4 Communication and Statistical Software..........................................................14
6.5 Commands......................................................................................................14
6.6 Data Format....................................................................................................15
7. Recorder Output Option ........................................................................ 16
7.1 RS232 / Recorder Output Socket Connections .................................................16
8. Selecting Buffers for Automatic Buffer Recognition............................ 17
9. Initialising the 901-PH............................................................................ 18
10. Troubleshooting..................................................................................... 19
10.1 General Error Messages ..............................................................................19
10.2 pH and mV Troubleshooting .......................................................................20
10.3 Temperature Troubleshooting......................................................................21
11. Appendices............................................................................................. 22
11.1 pH Sensor Fundamentals.............................................................................22
11.2 Polarisation Output Connector.....................................................................24
11.3 Guard Connector.........................................................................................25
11.4 Checking the reference junction of a pH sensor............................................25
11.5 Determining if an instrument or sensor is faulty...........................................26
12. Warranty ................................................................................................. 27

Page 2
1. Introduction
1.1 901-PH Display and Controls
1.2 901-PH Rear Panel Connectors

Page 3
1.3 901-PH Front Panel
Display
•16 character alphanumeric LCD with 14.5 mm characters.
•pH/mV and Temperature can be displayed simultaneously.
•User friendly text prompts and error messages.
•Serial number is displayed when the 901-PH is switched on.
Key
•Switches between pH, mV, Temperature and 2 optional RS232 modes. See
section 2.
Key
•Used to calibrate pH and Temperature. See sections 3and 5.
•Also used to select buffers for automatic buffer recognition. See section 8.
and Keys
•Used for temperature calibration. See section 5.
•Used for setting the manual temperature compensation value if the
temperature sensor is unplugged. See section 5.4.
•Press to recall asymmetry value from the last successful pH calibration.
•Press to recall slope value from the last successful pH calibration.
•Used to select baud rate when optional RS232 port is fitted. See section 6.1.
•Used to select output "send" rate when optional RS232 port is fitted. See
section 6.2

Page 4
1.4 Unpacking Information
Before using your new 901-PH, please check that the following accessories have
been included: Part No
1. 901-PH pH-mV-Temperature Instrument 121102
2. Combination pH Sensor 121207
3. Temperature/ATC Sensor 121245
4. pH6.88 Buffer, 200mL 121306
5. pH4.00 Buffer, 200mL 121381
6. AC/DC Power Adaptor 130044
7. 901-PH Handbook 130050
Options that may have been ordered with your 901-PH:
1. Solution Guard Rod 121360
2. Double Platinum Electrode for Karl Fischer 122207
Titrations
3. Flexible arm type sensor holder 130088
4. RS232 option (includes cable) 130029
5. RS232 Communication software for Windows 130086
6. Recorder output option (includes cable) 130028
7. Recorder PLUS RS232 option (includes cable) 130049

Page 5
1.5 Specifications
Ranges Resolution Accuracy
pH 0 to 14.00 pH 0.01 pH ±0.01 pH
mV 0 to ±600.0 mV
0 to ±1500 mV
(auto-ranging)
0.1 & 1 mV ±0.15 & ±1 mV
Temperature -10.0 to 120.0 OC0.1 OC±0.2 OC
Input Impedance :>3 x 1012 Ω
Asymmetry Range :-1.00 to 1.00 pH
Slope Range :85.0 to 105.0%
Temperature Compensation :0 to 100.0 oC, automatic or manual
Recorder Output :pH :0 to 14.00 pH for 0 to 2000 mV
i.e. pH7.00 = 1000 mV
mV :-1500 to +1500 mV for 0 to 2000 mV
i.e. 0 mV = 1000 mV
Temp :-10.0 to 120.0 OC for 0 to 2000 mV
i.e. 0.0 OC = 152 mV
Output impedance approx 1000 Ohms.
Power :12V DC by AC/DC power adaptor.
Dimensions :270 x 210 x 75 mm
Mass :Instrument only:Approx 1.0 kg
Full Kit :Approx 2.5 kg
Environment Temperature :0 to 45 oC
Humidity :0 to 90 % R.H.

Page 6
2. Operating Modes
If the 901-PH IS NOT fitted with the RS232 option, press the key to roll
through the three operating modes as follows…
pH Mode 7.00pH 25.07.00pH 25.0oocc
↓↓
mV Mode 500.0mV 25.0500.0mV 25.0oocc
↓↓
Temperature Mode 25.025.0oocc
↓↓
Back to pH Mode
If the 901-PH IS fitted with the RS232 option, press the key to roll
through the five operating modes as follows…
pH Mode 7.00pH 25.07.00pH 25.0oocc
↓↓
mV Mode 500.0mV 25.0500.0mV 25.0oocc
↓↓
Temperature Mode 25.025.0oocc
↓↓
RS232 Send Rate Send RateSend Rate ↑↑ 00↓↓
↓↓
RS232 Baud Rate Baud RateBaud Rate ↑↑96009600↓↓
↓↓
Back to pH Mode

Page 7
3. pH Calibration
3.1 Calibration Procedure
1. Switch the 901-PH on and select pH mode (section 2).
2. Plug the pH sensor into the Sensor socket and the temperature sensor into
the Temp socket.
3. Ensure that temperature has already been calibrated or manually set (see
sections 5.1 and 5.4). NOTE: A " ∗∗ " in place of the decimal point in the
temperature readout indicates that temperature is not calibrated.
4. Ensure that the primary and secondary buffers to be used have been
correctly selected for automatic buffer recognition. See section 8.
5. Remove the wetting cap from the pH sensor.
6. Rinse the pH and Temperature sensors in distilled water and blot them dry.
7. Place both sensors into a small sample of primary buffer (pH6.88 or pH7.00)
so that the bulb and reference junction are both covered, as per the diagram
below.
DO NOT place the sensors directly into the buffer bottle.

Page 8
8. When the reading has stabilised, press the key to calibrate. If a 1
point calibration has been performed, a " ∗∗ " in place of the decimal point
will not be removed until a full 2 point calibration has been performed.
9. Rinse the pH and Temperature sensors in distilled water and blot them dry.
10. Place both sensors into a small sample of secondary buffer (pH4.00, pH9.23
or pH10.01) so that the bulb and reference junction are both covered, as per
the diagram in step 7 above.
DO NOT place the sensor directly into the buffer bottle.
NOTE: pH9.23 and pH10.01 buffers are highly unstable. Avoid using
these buffers if possible. Discard immediately after use.
When the reading has stabilised, press the key to calibrate.
The " ∗∗ " in the pH reading will now be replaced by a decimal point if
calibration was successful.
11. The 901-PH is now calibrated and is ready for use.
Discard the used samples of buffer.
3.2 Calibration Notes
1. A 1-point calibration should be performed at least weekly. In applications
where the sensor junction can become blocked (eg. wines, 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 901-PH is
switched off, even when the power supply is removed.

Page 9
3.3 Calibration Messages
1. If a 1-point calibration has been successfully performed, the 901-PH will
display the asymmetry of the sensor and then go back to pH mode. For
example…
1 Point Cal. OK1 Point Cal. OK then: Asym=0.10pHAsym=0.10pH
The " ∗∗ " in place of the decimal point in the pH reading is not removed
unless a full 2 point calibration has been previously performed.
2. If a 1-point calibration has failed, the 901-PH will display the failed
asymmetry value of the sensor, before returning to pH mode. For example…
1 Point Cal.Fail1 Point Cal.Fail then: Asym=1.10pHAsym=1.10pH
The decimal point in the pH reading is replaced by a " ∗∗ " to indicate that pH
is not correctly calibrated.
3. If a 2-point calibration has been successfully performed, the 901-PH will
display the asymmetry and slope of the sensor and then go back to pH mode.
For example…
2 Point Cal. OK2 Point Cal. OK
then:
Asym=0.10pHAsym=0.10pH then: Slope=99.0%Slope=99.0%
Note that " ∗∗ " in the pH reading has now been replaced by a decimal point,
due to the successful calibration.
4. If a 2-point calibration has failed, the 901-PH will display the following
message, and then the failed slope value of the sensor before returning to pH
mode. For example…
2 Point Cal.Fail2 Point Cal.Fail then: Slope=85.0%Slope=85.0%
Note that " ∗∗ " replaces the decimal point in the pH reading to indicate that
pH is not correctly calibrated.