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CORNING 430 pH Meter Instruction Manual

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430 pH Meter
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.
1
109117-1 Rev. A, 10/96

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Summary of Contents for CORNING 430 pH Meter

  • Page 1 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.

  • Page 2: Table Of Contents

    Contents Set Up Unpacking and Installation ..........3 Input and Output Connections ........... 4 Display and Controls ............4 Operation Calibrating a pH Electrode ..........6 Measuring Samples ............7 Meter Reset and Buffer Sets ..........7 mV Measurements ............8 Temperature Measurements ..........

  • Page 3: Unpacking And Installation

    1.1 Unpacking and Installation 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 If you ordered the meter with an electrode, electrode arm and accessories, the top tray of the main carton will contain these items.

  • Page 4: Input And Output Connections

    1.2 Input and Output Connections DC - power ATC - ATC (automatic supply unit temperature compensation) socket probe socket pH - combination REC - recorder output socket, see Section 2.6 electrode socket for details Disconnect the shorting clip from the pH socket and retain it by clipping it over the socket.
  • Page 5 Display and Controls (cont) Selects pH, mV or temperature mode. mode Starts a calibration sequence in pH mode. Turns the display off, and places the meter in standby on/off mode. Wakes meter up. Starts sample measurement in all modes. Press again to read freeze display at endpoint.

  • Page 6: Calibrating A Ph Electrode

    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.

  • Page 7: Measuring Samples

    2.2 Measuring Samples Good laboratory practice dictates that electrodes should NOTE be calibrated at least daily. read 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. read When the reading is stable, press to freeze the display.

  • Page 8: Mv Measurements

    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. mode Put the tip of the electrode in the sample and press read...

  • Page 9: Chart Recorder

    2.6 Chart Recorder REC Socket recorder (–ve/ground) recorder (+ve/signal) other pins not used, or reserved for manufacturer’s use 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.

  • Page 10: Basic Theory

    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...

  • Page 11: Operating Hints

    Basic Theory (cont) Temperature is also an important consideration when measuring pH. It affects the electrode slope. ATC probes are recommended so that the slope can be corrected for temperature. There are many other factors that affect pH. Further information on pH theory and the factors that affect the ability to do accurate pH readings is included in ‘Guide to pH Measurement’.

  • Page 12: Maintenance

    Operating Hints (cont) Do not use calibration buffers after the expiration date printed on the package. Keep the bottles tightly capped and stored according to the manufacturer's instructions. Never put used buffer back into the bottle of new buffer. For small sample volumes, make sure that both the pH bulb and the reference junction are in contact with the sample.
  • Page 13 3.3.2 Electrode Maintenance (cont) • Formation of KCl salt at the tip and side of the electrode is normal and should be rinsed off with warm water. • Leave the tip of the electrode in an inch (25mm) of pH 7.0 or 4.0 buffer when it is not being used.

  • Page 14: Problem Solving

    3.4 Problem Solving Most problems are caused by electrode faults rather than by the Model 430 but power fluctuations can corrupt calibration values being held in the meter memory. 3.4.1 Meter Reset To assure that the meter memory and calibration points have not been corrupted by power fluctations, perform the meter reset and buffer set per Section 2.3 of this manual.

  • Page 15: Meter Error Codes

    Problem Solving (cont) If the meter passes the above test the problem is electrode related. Refer to Section 3.4.4 for electrode troubleshooting. If the meter fails the above test call the number on the back of this manual for warranty and service information. 3.4.3 Meter Error Codes Error codes are designed to give the user information on electrode performance problems.

  • Page 16: Electrode Problem Solving

    3.4.3 Meter Error Codes (cont) Although slope is useful in generally determining when it is time to do maintenance on an electrode, Response Time is, by far, the critical factor affecting accuracy of measurements. When moving from the 7.00 to the 4.00 buffer during calibration, you should have a stable value in 10-20 seconds.
  • Page 17 The creation of new junction potentials due to KCl dissociation problems can also cause instability. The best solution is to dilute the samples into measurable ranges. For more information refer to the Corning Guide to pH Measurement. 109117-1 Rev. A, 10/96...

  • Page 18: Specifications

    3.5 Specifications Operating Ranges Input Conditions 0.00 to 14.00 Impedance greater than ohms ±1999 Temp. 0 to 100°C Operating Conditions Operating temperature: Resolution 5 to 40°C 0.01 Operating humidity: max 80% at 35°C (non condensing) Temp. Installation category 2 Pollution category degree 2 Relative Accuracy* ±0.01 Size...
  • Page 19 Specifications (cont) Regulatory Compliance The 430 is manufactured in a FDA (Food & Drug Administration) and ISO 9001 approved plant for Corning, and complies with the following regulatory standards: UL1262, CSA151, IEC1010. The 430 also complies with the European EMC Directives and therefore carries the CE mark.

  • Page 20: Consumables And Accessories

    Shorting Test Clip Warranty: Corning warrants this product to be free from defects in materials and workmanship. The warranty period for the meter is two (2) years from the date of purchase and the probe is six (6) months from the date of purchase.
  • Page 21 © 1992. All rights reserved. Corning Incorporated Science Products Division Corning, New York 14831 Telephone: 1-800-222-7740 (US and Canada) 1-607-974-0353 (Outside US) Fax: 1-607-974-0345 430 ? Rev. A, 6/96...

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