TPS PH Cube Manuel utilisateur

Congratulations !

You have purchased the latest in benchtop pH-ORP-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

ABN 30 009 773 371

Unit 6 / 253 Leitchs Road

Brendale, QLD,

Australia, 4500

Phone : (07) 32 058 027

International : 61 7 32 058 027

Fax : (07) 3808 4871

International : 61 7 3808 4871

Email : [email protected]

Web : www.tps.com.au

Model pH Cube

pH-ORP-Temp.

Meter

Handbook Version : 1.3

Date : 12-Dec-11

Page 2

Contents

1. Introduction .................................................................................................. 3

1.1 pH Cube Front Panel and Controls................................................................... 3

1.2 pH Cube Side Panel and Connectors ................................................................ 4

1.3 Unpacking Information..................................................................................... 5

1.4 Specifications.................................................................................................... 5

2. Operating Modes..........................................................................................6

3. pH Calibration............................................................................................... 7

3.1 Calibration Procedure....................................................................................... 7

3.2 Calibration Notes.............................................................................................. 8

4. ORP/mV Calibration.....................................................................................8

5. Temperature Calibration .............................................................................9

5.1 Calibration Procedure....................................................................................... 9

5.2 Calibration Notes.............................................................................................. 9

5.3 Manual Temperature Setting ............................................................................ 9

6. Troubleshooting.........................................................................................10

6.1 pH and ORP/mV Troubleshooting ................................................................. 10

6.2 Temperature Troubleshooting......................................................................... 11

7. Appendices.................................................................................................12

7.1 pH Buffer Values Vs Temperature ................................................................. 12

7.2 pH Sensor Fundamentals................................................................................ 13

8. Warranty......................................................................................................16

Page 3

1. Introduction

1.1 pH Cube Front Panel and Controls

Display

12.7mm LED display with mode enunciator.

Function Switch

Switches between pH, ORP/mV and Temperature modes. See section 2.

Calibrate Control

Used for pH asymmetry calibration in pH7.00 or pH6.86 buffer. See section

Slope Control

Used for pH slope calibration in a buffer that is at least 2 to 3 pH away from

pH7.00, eg. pH4.01, pH9.18 or pH10.01. See section 3.

Manual Temp Control

Used to manually set the temperature of the solution for pH temperature

compensation. Only active when temperature sensor is unplugged. See

section 5.3.

Page 4

1.2 pH Cube Side Panel and Connectors

pH / mV Connector

Used to connect pH, ORP (Redox) and Specific Ion sensors.

Ref Connector

Used to connect Reference sensor when a mono pH, ORP (Redox) or

Specific Ion sensor is connected to the pH / mV Connector.

Temp Connector

Used to connect Temperature sensor. This sensor provides temperature

readout as well as Automatic Temperature Compensation for pH readings.

Temp Cal Control

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

1.3 Unpacking Information

Before using your new pH Cube, please check that the following accessories

have been included: Part No

1. pH Cube pH-ORP-Temperature Instrument 121122

2. Combination pH Sensor 121207

3. Temperature/ATC Sensor 121245

4. pH7.00 Buffer, 200mL 121387

5. pH4.01 Buffer, 200mL 121381

6. Rod and Clamp for 2 x 12mm and 1 x 6mm 121346

diameter sensor.

7. AC/DC Power Adaptor 130044

8. pH Cube Handbook 130050

1.4 Specifications

Ranges

Resolution

Accuracy

0 to 14.00 pH

0.01 pH

±0.01 pH

ORP/mV

0 to ±1999 mV

1 mV

±1 mV

Temperature

-10.0 to 120.0 OC

0.1 OC

±0.2 OC

Input Impedance : >3 x 1012 

Asymmetry Range : Approx -1.00 to 1.00 pH

Slope Range : Approx 85.0 to 105.0%

Temperature Compensation : Automatic : 0 to 100.0 oC

Manual : 5 to 100 oC

Power : 12V DC by AC/DC power adaptor.

Dimensions : 120 x 120 x 120 mm

Mass : Instrument only : Approx 0.9 kg

Full Kit : Approx 2.1 kg

Environment Temperature : 0 to 45 oC

Humidity : 0 to 90 % R.H.

Page 6

2. Operating Modes

Switch the function switch to any one of the following three operating modes.

Note the mode enunciator –Pfor pH, Efor EMF (ORP/mV), and Cfor OC.

Function Switch

Position

Display example

ORP/mV

Temp

Page 7

3. pH Calibration

3.1 Calibration Procedure

1. Switch the pH Cube to pH mode (see 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 5.3).

4. Remove the wetting cap from the pH sensor.

5. Rinse the pH and Temperature sensors in distilled water and blot them dry.

6. Place both sensors into a small sample of primary buffer that is at or near

pH7 (eg. pH7.00 or pH6.86). The bulb and reference junction should both be

covered, as per the diagram below.

DO NOT place the sensors directly into the buffer bottle.

Page 8

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.

8. Rinse the pH and Temperature sensors in distilled water and blot them dry.

9. Place both sensors into a small sample of secondary buffer (eg. pH4.01,

pH9.18 or pH10.01) so that the bulb and reference junction are both

covered, as per the diagram in step 6 above.

DO NOT place the sensor directly into the buffer bottle.

pH9.18 and pH10.01 buffers are unstable once the bottles have been

opened. Discard immediately after use.

When the reading has stabilised, adjust the Slope 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.

10. The pH Cube is now calibrated and is ready for use.

Discard the used samples of buffer.

3.2 Calibration Notes

1. A 1-point calibration using the Calibrate control in a pH7.00 or pH6.86

buffer 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.

4. ORP/mV Calibration

The mV section is factory calibrated. There is no user-calibration facility for this

mode.

Page 9

5. Temperature Calibration

The temperature readout must be calibrated or manually set before attempting pH

calibration.

5.1 Calibration Procedure

1. Switch the pH Cube to Temperature mode (see section 2).

2. Plug the temperature sensor (Part No 121245) into the Temp socket.

3. Place the sensor alongside a good quality mercury thermometer into a

beaker of room temperature water. Stir the sensor and the thermometer

gently to ensure an even temperature throughout the beaker.

4. When the reading has stabilised, adjust the Temp Cal. control until the

display shows the same temperature as the mercury thermometer.

5. The Temperature function of the pH Cube is now calibrated and is ready for

use.

5.2 Calibration Notes

1. Temperature does not need to be recalibrated unless the Temperature sensor

is replaced.

5.3 Manual Temperature Setting

Manual temperature setting is only available if the temperature sensor is not

plugged in.

1. Switch the pH Cube on and select Temperature mode (see section 2).

2. Measure the temperature of the sample solution.

3. Adjust the Manual Temp control until the display shows the measured

temperature of the sample solution.

Page 10

6. Troubleshooting

6.1 pH and ORP/mV Troubleshooting

Symptom

Possible Causes

Remedy

Meter displays

“-1. " as a

reading.

pH reading is over-ranged.

pH sensor not connected or

faulty. Replace sensor if

necessary.

Asymmetry

calibration with

Calibrate control

in pH7.00 or

pH6.86 buffer fails.

(Asymmetry is

greater than +/-1.00

pH.)

1. Reference junction blocked.

(See section 7.3)

2. Reference electrolyte

contaminated.

Clean reference by immersing

the probe in hot water (60C)

for a few minutes. Proteins can

be cleaned off using a pepsin

solution.

Replace electrolyte if using a

refillable sensor.

Slope calibration

with Slope control

in low or high

buffer fails. (Slope

is less than 85.0%.)

1. Glass bulb not clean.

2. Sensor is aged.

3. Connector is damp.

4. Buffers are inaccurate.

Clean glass bulb as per

instructions supplied with the

sensor.

Attempt rejuvenation, as per

instructions supplied with the

sensor. If not successful,

replace sensor.

Dry in a warm place.

Replace buffers.

Inaccurate readings,

even when

calibration is

successful.

Reference junction blocked.

(See section 7.3)

Clean reference junction by

immersing the probe in hot

water (60C) for a few minutes.

Displays around

pH7.00 for all

solutions.

Electrical short in connector.

1. Check connector. Replace if

necessary.

2. Replace sensor.

Displays 4-5 pH for

all solutions.

Glass bulb or internal stem

cracked.

Replace sensor.

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