Teledyne OT-2 3.4 Testing the System

Model OT-2 System Operation 3

3-9

Teledyne Analytical Instruments

3.3.3 H2S Scrubber

The life expectancy of the stainless steel H2S scrubber, in-

cluded in this system, is determined by the amount of H2S passing

through it.

With the maximum concentration of 200 PPM H2S and a flow

rate of 0.2 scfh the expected scrubber life will be over 6 months

with Purifil® and over 11 months with Purifil® II.

This scrubber life expectancy increases with lower H2S con-

centration or gas sample flow rates. It is recommended that the

flow rate be set no higher than 0.4 scfh initially. The flow rate

should be increased only if a faster system response time is de-

sired.

It is suggested that a spare scrubber be kept on hand and

replaced every 6 months. When the scrubber needs to be re-

placed, follow the procedure in section 4,

Maintenance

, "Scrub-

ber Replacement".

WARNING: IF SCRUBBER IS NOT PROPERLY MAINTAINED THE

O2SENSOR LIFE WILL BE SHORTENED.

3.3.4 Exhaust/Vent Line (Sample Return)

It is recommended that a long vent line (approx. 4 ft.) be

installed to the "Sample Return" connector at the side of the sys-

tem enclosure. The extended vent line will minimize back diffusion

from the atmosphere back to the sensor. The minimum recom-

mended tubing diameter is 1/4" to minimize back pressure.

3.4 Testing the System

Before connecting the instrument into the power source:

•Check the integrity and accuracy of the gas

connections. Make sure there are no leaks.

•Check the integrity and accuracy of the electrical

connections. Make sure there are no exposed

conductors.

•Check that inlet sample pressure is within the

acceptable range (see section 3.3.1).

•Power up the system, and test it.

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