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2-2
2 Operational Theory Model 3190
Teledyne Analytical Instruments
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 effec-
tively 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: Micro-Fuel Cell
Refer to Figure 2-2, Cross Section of a Micro-Fuel Cell, which illus-
trates the following internal description.
Figure 2-2. Cross Section of a Micro-Fuel Cell (simplified)