CORNING 440 pH Meter Instruction Manual
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CORNING 440 pH Meter Instruction Manual

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Instruction Manual
This manual contains complete instructions for setting up and using
the 440 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 440 is intended for
use by persons knowledgeable in safe laboratory practices. If the 440
is not used in accordance with these instructions for use, the
protection provided by the equipment may be impaired.
The 440 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 440 or power supply unit.
Do not remove the covers.
109118-1 Rev. A,10/96
440 pH Meter
1

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Summary of Contents for CORNING 440 pH Meter

  • Page 1 Instruction Manual This manual contains complete instructions for setting up and using the 440 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 ..........7 Measuring Samples ............8 Automatic Endpoint (Auto Read) ........8 Changing the Calibration Buffer Settings ......8 mV 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 Meter Dust Cover 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 ATC - ATC (automatic temperature compensation) probe socket DC - power pH - combination or supply unit pH electrode socket socket DATA - data REF - reference REC - recorder output socket, electrode socket output socket, see Section 2.9 see Section 2.8 for interfacing...
  • Page 5 Display and Controls (cont) Selects pH or mV mode. mode Increases displayed value; used when setting calibration buffers. Also changes display resolution. Decreases displayed value; used when setting calibration buffers. Also changes display resolution. buffer Selects calibration buffers. auto Selects automatic endpoint detection. read Turns the display off, and places the meter in standby on/off...
  • Page 6 Display and Controls (cont) 440 Display auto endpoint is selected main display mode temperature or error code slope value automatic or manual slope value calibration buffer temperature compensation displayed indicator Example pH Reading 109118-1 Rev. A, 10/96...

  • Page 7: Calibrating A Ph Electrode

    2.1 Calibrating a pH Electrode 1-point calibration Place the tip of the electrode in a calibration buffer and press It does not matter which buffer you do first. If you have the 'auto read ' feature (see Section 2.3) turned on, the meter will automatically endpoint when the reading is stable and the appropriate buffer symbol will appear on the display.

  • Page 8: Measuring Samples

    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 read start the measurement. The decimal point will be flashing whenever the electrode is reading. If you are using the 'auto read ' function the display freezes when a stable endpoint is reached (see Section 2.3).

  • Page 9: Mv Measurements

    Changing the Calibration Buffer Settings (cont) The buffers cannot be changed while the meter is reading. If the read decimal is flashing (meter reading) press the key to freeze the display. To review or change the buffers currently in memory press buffer The meter will indicate that you are looking at buffer #1 and the value will be flashing indicating that it can be changed.

  • Page 10: Temperature Measurements

    mV Measurements (cont) Press until mV shows at the top of the display. mode Put the tip of the electrode in the sample and press read meter will display absolute millivolts. read When the reading is stable, press to freeze the display. 2.6 Temperature Measurements To measure temperature you must be using an ATC probe or the 3-in-1 Combination electrode which includes an ATC probe.

  • Page 11: Changing The Resolution

    2.7 Changing the Resolution The resolution in pH can be changed between one and two read decimal places. Start by pressing to freeze the display. Use the to change resolution from 0.0 to 0.00 Use the to change resolution from 0.00 to 0.0 read Press to resume normal operation.

  • Page 12: Interfacing Via The Rs232 Output

    2.9 Interfacing via the RS232 Output The Model 440 can transmit data in RS232C Serial format to compatible devices such as Serial Printers and computers. There is no handshake capability but data can be received and manipulated by most data acquisition software packages. The cable required for connection to IBM compatible computers is part number 477758 and can be ordered from your distributor.

  • Page 13: 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 14: Operating Hints

    3.2 Operating Hints This section gives some brief operating hints and good laboratory practices to help assure trouble free pH measurements. New electrodes (or electrodes that have been in storage) should be conditioned in one inch (25 mm) of pH 7.0 or 4.0 buffer for several hours prior to their use.

  • Page 15: Maintenance

    3.3 Maintenance 3.3.1 Meter Maintenance The Model 440 needs no maintenance except for an occasional wipe with a damp cloth. The front panel is made of polyester and is not affected by most solvents. Polyester is known to be affected by some organic solvents, including toluene, xylene and methyl- ethyl-ketone.

  • Page 16: Problem Solving

    Maintenance (cont) 3.3.2 Electrode Maintenance (cont) Oil contamination - Carefully clean the tip of the electrode using a cotton swab soaked with alcohol or acetone. The tip of Glass body electrodes can be put directly into organic cleaners but do not put plastic or epoxy body electrodes into organic solvents.

  • Page 17: Meter Error Codes

    Problem Solving (cont) 3.4.1 Meter Test and Reset (cont) Press read and all segments will display. Press and the meter will return to normal operation. on/off Disconnect the electrode from the meter and install the shorting clip in the electrode socket. If the meter is operating properly it will display a stable pH value between 6.98 and 7.02 ( or 0 ±1 mV in the millivolt mode).

  • Page 18: Electrode Problem Solving

    Problem Solving (cont) 3.4.2 Meter Error Codes (cont) Slope is a value that compares the actual slope determined by the calibration to the theoretical slope defined by the Nernst equation. This value is displayed as a percent of theoretical and is called electrode efficiency (see Section 3.1 for Basic Theory).
  • Page 19 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. 109118-1 Rev. A,10/96...

  • Page 20: Specifications

    3.5 Specifications Input Conditions Operating Ranges Impedance greater than 10 –1.99 to 16.00 ohms ±1999 Temp. –5 to 105°C Operating Conditions Operating temperature: 5 to Resolution 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...

  • Page 21: Meter Specifications

    Meter Specifications (cont) Regulatory Compliance The 440 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 440 also complies with the European EMC Directives and therefore carries the CE mark.

  • Page 22: Consumables And Accessories

    Dot Matrix Printer with Cables 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 23 © 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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