Anatomy Of A Micro-Fuel Cell; Figure 2-1. Basic Elements Of A Micro-Fuel Cell (Not To Scale) - Teledyne 3190 Operating Instructions Manual

Trace oxygen analyzer

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Operational Theory

There is, however, an important difference in the operation of a

battery as compared to the micro-fuel cell: In the battery, all reactants

are stored within the cell, whereas in the micro-fuel cell, one of the

reactants (oxygen) comes from outside the device as a constituent of the

sample gas being analyzed. The micro-fuel cell is therefore a hybrid

between a battery and a true fuel cell. (All of the reactants are stored

externally in a true fuel cell.)

2.2.2 Anatomy of a Micro-fuel Cell

The Micro-Fuel Cell is a cylinder only 1¼ inches in diameter and 1

inch thick. It is made of extremely inert plastic, which can be placed

confidently in practically any environment or sample stream. It is

effectively sealed, although one end is permeable to oxygen in the

sample gas. The other end of the cell is a contact plate consisting of two

concentric foil rings. The rings mate with spring-loaded contacts in the

sensor block assembly and provide the electrical connection to the rest

of the analyzer. Figure 2-1 illustrates the external features.

Figure 2-1: Basic Elements of a Micro-fuel cell (not to scale)

Refer to Figure 2-2, Cross Section of a Micro-fuel Cell, which

illustrates the following internal description.

Teledyne Analytical Instruments

Model 3190

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