Table of Contents
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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
: (07) 32 900 400
International : 61 7 32 900 400
Fax
: (07) 3808 4871
International : 61 7 3808 4871
tps@tpssite.com.au
Email
:
Web Site
: www.tpssite.com.au
Model 901-PH
pH-mV-Temp.
Meter
Handbook Version : 5
Date
: 30-Aug-99
Author
: MS
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Table of Contents
Troubleshooting
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Summary of Contents for TPS 901-PH
- Page 1 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.
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Page 2: Table Of Contents
Page 1 Contents 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 Operating Modes..................6 pH Calibration ..................7 3.1 Calibration Procedure..................7 3.2 Calibration Notes .................... -
Page 3: Introduction
Page 2 1. Introduction 1.1 901-PH Display and Controls 1.2 901-PH Rear Panel Connectors... -
Page 4: 901-Ph Front Panel
Temperature can be displayed simultaneously. • User friendly text prompts and error messages. • Serial number is displayed when the 901-PH is switched on. • Switches between pH, mV, Temperature and 2 optional RS232 modes. See section 2. -
Page 5: Unpacking Information
Page 4 1.4 Unpacking Information Before using your new 901-PH, please check that the following accessories have been included: Part No 901-PH pH-mV-Temperature Instrument 121102 Combination pH Sensor 121207 Temperature/ATC Sensor 121245 pH6.88 Buffer, 200mL 121306 pH4.00 Buffer, 200mL 121381... -
Page 6: Specifications
Page 5 1.5 Specifications Ranges Resolution Accuracy 0 to 14.00 pH 0.01 pH ±0.01 pH 0 to ±600.0 mV 0.1 & 1 mV ±0.15 & ±1 mV 0 to ±1500 mV (auto-ranging) Temperature -10.0 to 120.0 ±0.2 Ω Input Impedance : >3 x 10 Asymmetry Range : -1.00 to 1.00 pH... -
Page 7: Operating Modes
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… 7.00pH 7.00pH 25.0 25.0 pH Mode ↓ ↓ 500.0mV 500.0mV 25.0 25.0 mV Mode ↓... -
Page 8: Ph Calibration
Page 7 3. pH Calibration 3.1 Calibration Procedure Switch the 901-PH on and select pH mode (section 2). Plug the pH sensor into the Sensor socket and the temperature sensor into the Temp socket. Ensure that temperature has already been calibrated or manually set (see sections 5.1 and 5.4). -
Page 9: Calibration Notes
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 10: Calibration Messages
The " ∗ ∗ " in place of the decimal point in the pH reading is not removed unless a full 2 point calibration has been previously performed. 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…... -
Page 11: Mv Calibration
5.1 Calibration Procedure Switch the 901-PH on and select Temperature mode (see section 2). Plug the temperature sensor (Part No 121245) into the Temp socket. Place the sensor alongside a good quality mercury thermometer into a beaker of room temperature water. -
Page 12: Calibration Notes
The " ∗ ∗ " is replaced by a decimal point in the Temperature reading to indicate that Temperature is correctly calibrated. If a temperature calibration has failed, the 901-PH will display the failed offset value of the sensor before returning to Temperature mode. For example…... -
Page 13: Manual Temperature Setting
5.4 Manual Temperature Setting Manual temperature setting is only available if the temperature sensor is not plugged in. An "m m " is added to the Temperature display when the 901-PH is using a manual Temperature setting. For example… 7.00pH 7.00pH... -
Page 14: Rs232 Port
Send Rate. Press the key to decrease the Send Rate. The Send Rate can be set from 0 to 9999 seconds. Set the Send Rate to Zero to allow the 901-PH to accept commands from a remote computer. Press the... -
Page 15: Rs232 Configuration
Information on how to use the software is provided in the README files on the diskette. 6.5 Commands The following command can be sent from a PC to the 901-PH. Note that <cr> denotes carriage return and <lf> denotes a line feed. Action... -
Page 16: Data Format
PC with the ?D command (section 6.5): DDDDDDUUss ssTTTTTToCm<cr> or B. Data is sent to the RS232 port by the 901-PH in the following format when it is sent by the 901-PH using the Send function (section 6.2): DDDDDDUUss ssTTTTTToCm<cr><lf>... -
Page 17: Recorder Output Option
Page 16 7. Recorder Output Option This section is applicable when the optional analogue recorder output is fitted. The recorder output corresponds to the currently selected display mode. There is no output in RS232 Send Rate or RS232 Baud Rate modes. The output voltages are as follows: : 0 to 14.00 pH for 0 to 2000 mV i.e. -
Page 18: Selecting Buffers For Automatic Buffer Recognition
Page 17 8. Selecting Buffers for Automatic Buffer Recognition The 901-PH is factory set to automatically recognise pH4.00, pH6.88 and pH9.23 buffers. There is also the options of using pH7.00 instead of pH6.88 and pH10.01 instead of pH9.23. The following procedure describes how to set which of these buffers are automatically recognised at calibration. -
Page 19: Initialising The 901-Ph
901PH" is shown when the optional RS232 port is fitted.) The 901-PH now goes on to pH mode. Note that a " ∗ ∗ " replaces each of the decimal points in the pH and Temperature readings, indicating that the unit requires calibration. -
Page 20: Troubleshooting
10.1 General Error Messages Error Message Possible Causes Remedy Not Factory Cal. Not Factory Cal. The EEPROM chip which Switch the 901-PH off, contains factory wait 10 seconds, and try (displayed at turn-on) calibration information has switching on again. failed. -
Page 21: Ph And Mv Troubleshooting
Page 20 10.2 pH and mV Troubleshooting Symptom Possible Causes Remedy Meter displays pH reading is over-ranged. pH sensor not connected or OverR" as a pH "OverR faulty. Replace sensor necessary. reading. Unit fails to Calibration settings outside of Initialise the unit. See section 9. calibrate, even with allowable limits due to previous new sensor. -
Page 22: Temperature Troubleshooting
Page 21 pH and mV Troubleshooting, continued… Unstable readings. 1. Static charge or electrical Fit a solution earth rod to the Guard connector. noise from near electrical equipment causing interference. 2. Reference junction blocked. Clean reference junction as per instructions supplied with the sensor. -
Page 23: Appendices
Page 22 11. Appendices 11.1 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 24 Page 23 11.1.2 The 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 25 C As the pH goes down, an ideal pH sensor produces +59mV/pH unit.
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Page 25: Polarisation Output Connector
BNC connector fits to the Sensor socket and the smaller 3.5mm phono plug fits to the Polarisation socket. DO NOT PLUG THE DOUBLE PLATINUM ELECTRODE INTO THE TEMPERATURE SOCKET. When performing Karl Fischer titrations, ensure that the 901-PH is in mV mode. -
Page 26: Guard Connector
In these cases, a solution guard may eliminate the problem. A solution earth rod is available from TPS (part no 121360). This connects directly to the Guard socket. Alternatively, run a wire from the Guard socket to a stainless steel fitting in contact with the sample. -
Page 27: Determining If An Instrument Or Sensor Is Faulty
Page 26 11.5 Determining if an instrument or sensor is faulty The following test can be performed to help determine if the 901-PH or the pH sensor is faulty. 1. Initialise the 901-PH (see section 9). 2. Disconnect the pH sensor. -
Page 28: 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 29 Page 28 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.) Your equipment will be repaired and returned to you by air express where possible.
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