Teledyne OT-2 2-3

2-3

Teledyne Analytical Instruments

Model OT-2 System Operational Theory 2

Refer to Figure 2-2,

Cross Section of a Micro-Fuel Cell

, which

illustrates the following internal description.

Figure 2-2. Cross Section of a Micro-Fuel Cell (not to scale)

At the top end of the cell is a diffusion membrane of Teflon.

Beneath the diffusion membrane lies the oxygen sensing ele-

ment—the cathode.

The anode provides the electrical driving force for the reduc-

tion of oxygen at the cathode.

At the rear of the cell, just below the anode structure, is a

flexible membrane designed to accommodate the internal vol-

ume changes that occur throughout the life of the cell. This flexibil-

ity assures that the sensing membrane remains in its proper posi-

tion, keeping the electrical output constant.

The entire space between the diffusion membrane, above the

cathode, and the flexible rear membrane, beneath the anode, is

filled with electrolyte. Cathode and anode are submerged in this

common pool. They each have a conductor connecting them to

one of the external contact rings on the contact plate, which is on

the bottom of the cell.

Contents

Main ii Model OT-2 System Copyright 1999 Teledyne Analytical Instruments Table of Contents Model OT-2 System Model OT-2 System Introduction 1 Introduction 1 Introduction Model OT-2 System 1-2 1.3 Typical Applications 1-3 Model OT-2 System Introduction 1 1.4 Operator Interface Page Operational Theory 2-1 2.1 Introduction 2-2 2.2 Micro-Fuel Cell Sensor 2.2.1 Principles of Operation 2.2.2 Anatomy of a Micro-Fuel Cell 2-3 Cross Section of a Micro-Fuel Cell Figure 2-2. Cross Section of a Micro-Fuel Cell (not to scale) 2-4 2.2.3 Electrochemical Reactions 2-5 2-6 2.2.5 Calibration Characteristics 2-7 2.3 Electronics and Signal Processing 2.4 Oxygen Cell Block Heater Note: The cell block insulation must be in place for the heater system to be effective. 2.5 EMI/RFI Protection 2-8 2.6 Sample System Sample Flow Description Page Page Operation 3.1 Installation Page Page 3-4 Teledyne Analytical Instruments 3-5 Figure 3-3 Front View of Transmitter Figure 3-4: Transmitter Electrical Connections 3-6 Teledyne Analytical Instruments 3.2 Installing the Micro-Fuel Cell Maintenance, 3.3 Calibration 3-7 Page 3-9 3.3.3 H2S Scrubber Maintenance 3.3.4 Exhaust/Vent Line (Sample Return) 3.4 Testing the System Page 4-1 Model OT-2 System Maintenance 4 Calibration Maintenance 4.1 Routine Maintenance 4.2 Cell Replacement 4 Maintenance4 Maintenance 4-2 4 Maintenance4 Maintenance 4 Maintenance Model OT-2 System 4-3 Model OT-2 System Maintenance 4 4.3 Scrubber Replacement 4.4 Filter Servicing Page Appendix Appendix Model OT-2 System A-3 Material Safety Data SheetMaterial Safety Data Sheet Section II Physical and Chemical Data Material Safety Data SheetMaterial Safety Data Sheet Material Safety Data Sheet Section I Product Identification A-4 Appendix Model OT-2 System Section III Physical Hazards Section IV Health Hazard Data Section VI Handling Information Section V Emergency and First Aid Procedures A-5