Teledyne OT-2 - page 26

3 Operation Model OT-2 System

3-8 Teledyne Analytical Instruments

NOTE: This procedure is more critical on the 0-10 ppm range and

less critical on the 0-100 or 0-1000 ppm range.

3.3.2 Setting the Span Pot

1. Switch the system from zero gas to span gas and allow

time for stabilization.

Figure 3-6: Span Pot Location

NOTE: The span gas should have an O2 concentration of 80% -

100% of full scale. For example, if the range is set at 0-100

ppm, the span gas should be a certified grade gas of

about 90 ppm O2 in N2 or Argon.

2. If 90 ppm gas is used, adjust the span pot (Figure 3-6)

to read 90.0 ppm on the LCD display. The output to

the Elsag Baily Total Flow TM computer will have a

signal of 4.6VDC (into a >10K ohm load).

The formula for this is:

Span Gas % F.S. x 4 Output in VDC

100 1

Display

Span

Span Pot

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