CORNING 430 pH Meter Manuel utilisateur

109117-1 Rev. A, 10/96

Instruction Manual

This manual contains complete instructions for setting up and using

the 430 pH meter. Applications information is also available.

The information contained in this manual was correct at the time of

going to print. However, we continue to improve products and reserve

the right to change specifications, equipment and maintenance

procedures at any time.

This manual is copyrighted, and all rights are reserved. No part of

this manual may be reproduced by any means or in any form without

prior consent in writing.

The power supply unit is classed as IEC Class II equipment

(equipment providing an adequate degree of protection against

electric shocks, in which additional safety precautions, for example,

double or reinforced insulation, are included). The 430 is intended for

use by persons knowledgeable in safe laboratory practices. If the 430

is not used in accordance with these instructions for use, the

protection provided by the equipment may be impaired.

The 430 is suitable for direct current only.

This equipment generates, uses and can radiate radio frequency

energy and if not installed and used in accordance with the

instruction manual, may cause interference with radio

communications. It has been tested and found to comply with the

limits for a Class A computing device pursuant to Subpart J of Part

15 of FCC Rules, which are designed to provide reasonable protection

against such interference when operated in a commercial

environment. Operation of this equipment in a residential area is

likely to cause interference in which case the user at his own expense

will be required to take whatever measures may be required to

correct the interference.

There are no user replaceable parts in the 430 or power supply unit.

Do not remove the covers.

430 pH Meter

2109117-1 Rev. A, 10/96

Contents

1 Set Up

1.1 Unpacking and Installation ................................................ 3

1.2 Input and Output Connections........................................... 4

1.3 Display and Controls ......................................................... 4

2 Operation

2.1 Calibrating a pH Electrode ................................................ 6

2.2 Measuring Samples........................................................... 7

2.3 Meter Reset and Buffer Sets ............................................. 7

2.4 mV Measurements ............................................................ 8

2.5 Temperature Measurements ............................................. 8

2.6 Chart Recorder .................................................................. 9

3 Support Information

3.1 Basic Theory.................................................................... 10

3.2 Operating Hints................................................................ 11

3.3 Maintenance .................................................................... 12

3.3.1 Meter Maintenance.......................................................... 12

3.3.2 Electrode Maintenance.................................................... 12

3.4 Problem Solving .............................................................. 14

3.4.1 Meter Reset ..................................................................... 14

3.4.2 Meter Test ....................................................................... 14

3.4.3 Meter Error Codes ........................................................... 15

3.4.4 Electrode Problem Solving .............................................. 16

3.5 Specifications .................................................................. 18

Consumables and Accessories ............................... inside rear cover

Warranty .................................................................. inside rear cover

109117-1 Rev. A, 10/96

1.1 Unpacking and Installation

1. The main carton will contain the following:

Meter with a shorting (test) clip in the pH socket

Power Supply

This Instruction Manual

Memo Cards, English, French, German, Italian,

Spanish

Warranty Card

Calibration Certificate

2. If you ordered the meter with an electrode, electrode arm

and accessories, the top tray of the main carton will

contain these items. Refer to the accessories packing sheet

for a list of the additional components.

3. To attach the electrode arm to the pH meter:

a. The electrode arm can be attached to the left or right-

hand side. Using the screwdriver supplied remove the

appropriate end cap from the pH meter.

b. Slide the arm base into the recess and tighten the fixing

screw. Replace the end cap.

c. Fit the electrode arm onto the post. Adjust the tension

screw as required.

4. Fill in and return the warranty card. For your own record

make a note of the serial number, date of purchase and

supplier on the inside front cover of this manual.

electrode arm

arm base

tension screw

fixing screw

end cap

screwdriver

4109117-1 Rev. A, 10/96

1.2 Input and Output Connections

1. Disconnect the shorting clip from the pH socket and retain

it by clipping it over the socket. Connect the electrode. If

you are using an electrode incorporating ATC connect the

other lead to the ATC socket.

NOTE The 430 will not accept separate reference and pH

electrodes.

2. If you are using a separate ATC probe connect it to the

ATC socket.

3. Connect the power supply unit to the DC socket.

1.3 Display and Controls

DC - power

supply unit

socket

ATC - ATC (automatic

temperature compensation)

probe socket

REC - recorder output

socket, see Section 2.6

for details

pH - combination

electrode socket

109117-1 Rev. A, 10/96

1.3 Display and Controls (cont)

Selects pH, mV or temperature mode.

Starts a calibration sequence in pH mode.

Turns the display off, and places the meter in standby

mode. Wakes meter up.

Starts sample measurement in all modes. Press again to

freeze display at endpoint.

430 Display

Example: pH Reading, with ATC

automatic

temperature

compensation

mode calibration buffer

indicator

slope value

displayed

pH trend

indicator

cal

mode

on/off

read

6109117-1 Rev. A, 10/96

2.1 Calibrating a pH Electrode

1 point calibration

Place the tip of the electrode in the calibration buffer and

press It does not matter which buffer you do first.

The meter will automatically endpoint when the reading is stable

and the appropriate buffer symbol will appear on the display.

Rinse the tip of the electrode with distilled or deionized water and

goto Measuring Samples (Section 2.2) or 2 point calibration.

NOTE If you are using an ATC probe (or an electrode

incorporating ATC), temperature is being measured and

the buffer value is being corrected for temperature (see

Section 2.5). If you are not using an ATC in the system,

the Model 430 assumes a temperature of 25°C.

2 point calibration

Place the tip of the electrode in the second buffer and press

The meter will automatically endpoint when the reading is stable

and the appropriate buffer symbol will appear on the display. The

meter will also briefly display the electrode slope value.

Rinse the tip of the electrode with distilled or deionized water and

goto Measuring Samples (Section 2.2).

NOTE For maximum accuracy, we recommend using an ATC

probe or the 3-in-1 Combination electrode which includes

an ATC probe. If you do not have an ATC probe you

should make sure that all buffers and samples are at

25°C.

cal

109117-1 Rev. A, 10/96

2.2 Measuring Samples

NOTE Good laboratory practice dictates that electrodes should

be calibrated at least daily.

Place the tip of the electrode in the sample and press

to start the measurement. The decimal point will be

flashing whenever the electrode is reading.

When the reading is stable, press to freeze the display.

NOTE The display of the Model 430 will show both a digital

and an analog pH reading.

2.3 Meter Reset and Buffer Sets

This process resets the meter electronics and places the selected

buffer set in the meter memory. When calibrating you can use

any two of the three buffers in the selected set.

Buffer Set 1 (b=1): 4.00, 7.00, 10.01 pH

Buffer Set 2 (b=2): 4.01, 7.00, 9.21 pH

Buffer Set 3 (b=3): 4.01, 6.86, 9.18 pH

To reset the meter and buffer set:

Turn the meter off

Press and hold and turn meter on

Release key.

The display will show b=1, b=2, or b=3.

Press until display shows the buffer set you want.

Press and the meter will reset and put the selected buffer

set into the meter memory.

cal

on/off

mode on/off

mode

read

8109117-1 Rev. A, 10/96

2.4 mV Measurements

The millivolt capability of pH meters can be used to determine the

actual slope of pH electrodes but is most frequently used for doing

potentiometric readings or titrations with Platinum Oxidation-

Reduction electrodes.

Press until mV shows at the top of the display.

Put the tip of the electrode in the sample and press

The meter will display absolute millivolts.

When the reading is stable, press to freeze the display.

2.5 Temperature Measurements

To measure temperature you must be using an ATC probe or the

3-in-1 Combination electrode which includes an ATC probe. If you

do not have an ATC probe the temperature will default to 25°C.

Press until °C shows at the top of the display.

Put the ATC probe (or 3-in-1 electrode) in the sample and

press The meter will display temperature in °C.

When reading is stable, press to freeze the display.

Buffer Temperature Correction Table

The 430 automatically corrects for temperature using the values

shown in the table.

4.00 4.01 6.86 7.00 9.18 9.21 10.01

0°C 4.00 4.01 6.98 7.12 9.46 9.52 10.32

5°C 4.00 4.01 6.95 7.09 9.40 9.45 10.25

10°C 4.00 4.00 6.92 7.06 9.33 9.38 10.18

15°C 4.00 4.00 6.90 7.04 9.28 9.32 10.12

20°C 4.00 4.00 6.88 7.02 9.23 9.26 10.06

25°C 4.00 4.01 6.86 7.00 9.18 9.21 10.01

30°C 4.01 4.01 6.86 6.99 9.14 9.16 9.97

35°C 4.02 4.02 6.84 6.98 9.10 9.11 9.93

40°C 4.03 4.03 6.81 6.98 9.07 9.06 9.89

45°C 4.04 4.04 6.83 6.97 9.04 9.03 9.86

50°C 4.06 4.06 6.83 6.97 9.01 8.99 9.83

mode

read

109117-1 Rev. A, 10/96

2.6 Chart Recorder

REC Socket

The REC socket (5-pin, 180° DIN socket) provides a voltage

proportional to the displayed reading in pH and mV modes. The

polarity of the output is the same as the polarity of the input

signal.

Approximate Recorder Outputs

pH - Output follows display and provides approximately 60 mV

output per pH unit. This value will vary with changes in

electrode slope.

mV - Output follows display, i.e. as display varies from –1999 to

1999 mV, output varies from –1999 to +1999 mV.

The recorder output is not available in temperature mode.

other pins not used, or reserved

for manufacturer’s use

recorder (–ve/ground)

recorder (+ve/signal)

425

10 109117-1 Rev. A, 10/96

3.1 Basic Theory

pH is the unit of measurement of the acidity or alkalinity of a

solution, and is expressed as the negative logarithm of the

hydrogen ion concentration:

pH = –log[H+]

pH 0 is very acidic, pH 14 is very alkaline and pH 7 is neutral.

For routine pH measurements a sensing electrode and a

reference electrode or a combination electrode (both electrodes in

one body) are used along with a meter capable of displaying the

measurements.

The pH sensing electrode has an internal solution with a

constant pH value, and develops a potential when placed in a

solution. This is caused by the activity of the H+ions in the

solution. The reference electrode has a defined, stable potential

irrespective of the H+activity in the sample. The Model 430

measures and converts the resulting minute electrode voltages

into a pH reading.

The response of a pH electrode (or its ‘slope’) is defined by the

Nernst equation:

Electrode response = E0– 2.3RT .pH

where: E0= a constant factor

R = the gas constant

F = the Faraday constant

T = the temperature in Kelvin

n = the ionic charge

The theoretical slope for an electrode is 59.16 mV where the H+

ionic charge (n) = 1 at 25°C (298K). This means that for a one

unit change in pH the system will sense a change of 59.16 mV.

The measurement of electrode slope is a good indication of

electrode condition.

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