Table of Contents
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Congratulations !
You have purchased the latest in benchtop pH-mV-Temperature instrumentation.
We trust that your new pH Cube will give you many years of reliable service.
The pH Cube 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 pH Cube. It also contains a full listing of all of the items that you should
have received with your pH Cube. 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 pH Cube,
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
Email
:
tps@tps.com.au
Web Site
: www.tps.com.au
Model pH Cube
pH-mV-Temp.
Meter
Handbook Version : 1.1
Date
: 17-May-05
Author
: AB
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Table of Contents
Troubleshooting
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Summary of Contents for TPS pH Cube
- Page 1 The introduction has a diagram and explanation of the display and controls of the pH Cube. It also contains a full listing of all of the items that you should have received with your pH Cube. 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 pH Cube Front Panel and Controls ................2 1.2 pH Cube Side Panel and Connectors ..............3 1.3 Unpacking Information..................4 1.4 Specifications......................4 Operating Modes..................5 pH Calibration....................6 3.1 Calibration Procedure ....................6 3.2 Calibration Notes ....................7 mV Calibration.................... -
Page 3: Introduction
Page 2 1. Introduction 1.1 pH Cube Front Panel and Controls Display • 12.7mm LED display with mode enunciator. Function Switch • Switches between pH, mV and Temperature modes. See section 2. Calibrate Control • Used for pH asymmetry calibration in pH6.88 or pH7.00 buffer. See section Slope Control •... -
Page 4: Ph Cube Side Panel And Connectors
Used for temperature calibration. See section 5. 12V DC Power Connector • Used to connect 12V AC/DC Adaptor. The pH Cube can run off any 12V DC source with at least 200mA output. The 12V DC connector has a positive tip. -
Page 5: Unpacking Information
Page 4 1.3 Unpacking Information Before using your new pH Cube, please check that the following accessories have been included: Part No pH Cube pH-mV-Temperature Instrument 121122 Combination pH Sensor 121207 Temperature/ATC Sensor 121245 pH6.88 Buffer, 200mL 121306 pH4.00 Buffer, 200mL... -
Page 6: Operating Modes
Page 5 2. Operating Modes Switch the function switch to any one of the following three operating modes. Note the mode enunciator – P for pH, E for EMF (mV), and C for Function Switch Display example Position Temp... -
Page 7: Ph Calibration
Page 6 3. pH Calibration 3.1 Calibration Procedure Switch the pH Cube to pH mode (see 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 5.3). -
Page 8: Calibration Notes
Page 7 When the reading has stabilised, adjust the Calibrate control until the display shows the value of the buffer at the current temperature. For TPS buffers, this is shown on the bottle. Refer also to the table in section 7.1. -
Page 9: Temperature Calibration
When the reading has stabilised, adjust the Temp Cal. control until the display shows the same temperature as the mercury thermometer. The Temperature function of the pH Cube is now calibrated and is ready for use. 5.2 Calibration Notes Temperature does not need to be recalibrated unless the Temperature sensor is replaced. -
Page 10: Troubleshooting
Page 9 6. Troubleshooting 6.1 pH and mV Troubleshooting Symptom Possible Causes Remedy Meter displays pH reading is over-ranged. pH sensor not connected or “-1. " as a faulty. Replace sensor if reading. necessary. Asymmetry 1. Reference junction blocked. Clean reference by immersing calibration with (See section 7.3) the probe in hot water (60°C) -
Page 11: Temperature Troubleshooting
Page 10 pH and mV Troubleshooting, continued… Unstable readings. 1. Reference junction blocked. Clean reference junction as per instructions supplied with the sensor. 2. Glass bulb not clean. Clean glass bulb instructions supplied with the sensor. 3. Bubble in glass bulb. Flick the sensor to remove bubble. -
Page 12: Appendices
Page 11 7. Appendices 7.1 pH Buffer Values Vs Temperature The following table lists the pH values of some popular buffers, with respect to Temperature. Any pH meter should always be calibrated to the correct value of the buffers at the current solution temperature. Temp pH4.00 pH6.88... -
Page 13: Ph Sensor Fundamentals
Page 12 7.2 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 14 Page 13 7.2.2 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 15: Checking The Reference Junction Of A Ph Sensor
1. Calibrate the pH Cube, as per section 3. 2. Dilute 1 part of pH6.88 buffer with 9 parts of distilled water. 3. Measure the pH of the diluted buffer. The result should be 7.06 +/-0.05 pH. -
Page 16: Determining If An Instrument Or Sensor Is Faulty
Page 15 7.4 Determining if an instrument or sensor is faulty The following test can be performed to help determine if the pH Cube or the pH sensor is faulty. 1. Set the Calibrate control approximately to the centre (as it is shown in the diagram in section 1.1. -
Page 17: 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 18 Page 17 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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