Pasco PS-2126A Oxygen Gas Sensor User Manual download pdf

Instruction Sheet

012-11736B

Oxygen Gas Sensor

PS-2126A

*012-11736*

Introduction

The PS-2126A Oxygen Gas Sensor measures oxygen gas con-

centration in percent (%) and parts per million (ppm) oxygen.

It can be used to study plant, animal, or cellular respiration; air

quality; and the rate of oxygen (O

) production in chemical

reactions (see the experiment on page 2 for one example).

How it works:

The Oxygen Sensing Element is a galvanic fuel cell with a gas

permeable membrane at one end. It is very similar to a battery.

The fuel cell contains an electrolyte, anode and cathode. When

oxygen enters the fuel cell through the membrane, a chemical

reaction between the metallic cathode and anode and the elec-

trolyte occurs. This chemical reaction produces a voltage and

current that is present at the output jack at the other end of the

Oxygen Sensing Element. The current produced is propor-

tional to the concentration of oxygen present.

Oxygen Sensing Element Life:

Galvanic fuel cells have a limited lifetime which is determined

by their age and their exposure to oxygen. This is similar to

the life of a battery in a flashlight. If the flashlight frequently

used, the battery life will not be as long as it would have been

with limited usage. Similarly, the fuel cell’s useful life is

determined by its exposure to oxygen gas.

The fuel cell included with the PS-2126A has a useful life of

900,000 oxygen percent (O

%) hours.

An example: If the sensor is used in a 100% oxygen atmo-

sphere, the life of the sensor may be calculated as

900,000 O

% hours divided by 100% oxygen which is

9,000 hours. This is about 1 year.

The life of the sensor in normal air (20.9% oxygen) is

900,000 O

% hours divided by 20.9% oxygen which is

43,062 hours. This is about 4.9 years.

The sensor is guaranteed for a minimum of 2 years from the

date of manufacture. This is the absolute guarantee. If it is

used in a 100% oxygen atmosphere its life will be shortened.

If it is used in normal air, its life will be 4 to 5 years. There is

reported evidence of this particular sensing element being in

use for almost 10 years. In the end, the useful life of the sens-

ing element is dependent on the manner in which it is used.

Setup

Connect the Oxygen Gas Sensor to your PASPORT interface.

To prepare the Oxygen Sensing Element for use:

1. Remove the Oxygen Sensing Element and deflector from

the packaging.

2. Remove the pink tape from the Oxygen Sensing Element.

3. Carefully thread the deflector onto the Oxygen Sensing

Element.

4. Slide the rubber stopper over the deflector.

sensor amplifier

sampling

bottle

connecting cable

sensing

element

rubber stopper

Included Equipment Part Number

Sensor Amplifier

PS-2126A (includes

sensing element)

Oxygen Sensing Element (with deflector)

699-299

Rubber Stopper

699-08186

Connecting Cable (3.5 millimeter)

514-08583

Sampling Bottle

650-064

Required Equipment

PASPORT Interface

See PASCO catalog

or www.pasco.com

1 2 3

Summary of Contents

Page 1 - Oxygen Gas Sensor

®Instruction Sheet012-11736BOxygen Gas SensorPS-2126A*012-11736*IntroductionThe PS-2126A Oxygen Gas Sensor measures oxygen gas con-centration in perce

Page 2 - Experiment: Oxygen

®Model No. PS-2126A Collecting O2 Samples25. Plug one end of the connecting cable into the Oxygen Sensing Element.6. Plug the other end of the connec

Page 3 - Technical Support

®Model No. PS-2126A 3Sensing Element MaintenanceStorage:The Oxygen Sensing Element may be stored in its package until its first use.It is recommended

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Pasco PS-2126A Oxygen Gas Sensor User Manual

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