Corning 312 Instruction Manual

Instruction Manual

Corning Model 312 Portable Dissolved Oxygen Meter

This manual contains complete instructions for
setting up and using the Corning Model 312
Portable Dissolved Oxygen Meter.

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.

CB.015.98 ©1998 Corning Incorporated

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Instruction Manual

Corning Model 312 Portable Dissolved Oxygen Meter

Contents
1 Set Up

1.1 Unpacking and Installation 3

1.2 Product Description 3

1.3 Functional Description 4

1.4 Initial Probe Preparation 5

2 Operation

2.1 Calibration 6

2.2 Measurements 6

2.3 Altitude Compensation 7

2.4 NaCl Compensation 7

3 Support Information

3.1 Probe and Membrane Maintenance 8

3.2 Battery Replacement 9

3.3 Specifications 9

Consumables/Accessories 10

Warranty 10

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Instruction Manual

Corning Model 312 Portable Dissolved Oxygen Meter

1.1 Unpacking and Installation

1. Unpack the meter and examine it to make
sure that no damage has occurred during
shipping. If there is any damage, notify your
distributor immediately.

2. In addition to this manual, you will find the
following items:

Meter w/Wrist Strap 1
DO Probe (476611) 1
Carry Case (470442) 1
Membrane Caps (473730) 3
Membrane Fill Solution
(30 ml Sample Bottle) 1
Warranty Card 1
Guide to Conductivity and
Dissolved Oxygen (470439) 1
9V Battery (471027) 1
Calibration Trimmer Screwdriver 1

3. Save all packing material until you are sure
that the instrument functions correctly. Any

defective or damaged items must be returned
in the original carton with the supplied
accessories.

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 page 10 of
this manual.

1.2 Product Description

The Corning Model 312 is a water resistant,
micro-processor-based Dissolved Oxygen Meter
with automatic temperature compensation. It has
been developed for dissolved oxygen
measurements in water and waste water
applications as well as other applications such as
fish farming.

Dissolved oxygen is displayed in milligrams/litre
(mg/l).

The displayed value is compensated for changes
in solubility of oxygen in water and for permeability
of the membrane as well as temperature.

One 9V Alkaline battery provides power and
makes the instrument completely portable. A
microprocessor is used for accurate and rapid
calibration measurement.

The dissolved oxygen probe has a membrane
covering the polargraphic sensors and a built-in
thermistor for temperature measurements and
compensation. The thin permeable membrane
isolates the sensor elements from the testing
solution, but allows the oxygen to enter. When a
voltage is applied across the sensor, oxygen that
has passed through the membrane reacts causing
the current to flow.

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