Teledyne OT-2 Operating Instructions Manual
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Teledyne OT-2 Operating Instructions Manual

Teledyne OT-2 Operating Instructions Manual

Oxygen transmitter system
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Model OT-2 System

OPERATING INSTRUCTIONS

FOR
Model OT-2
Oxygen
Transmitter System
DANGER
HIGHLY TOXIC AND OR FLAMMABLE LIQUIDS OR GASES MAY BE PRESENT IN THIS MONITORING
P/N: M71265
SYSTEM. PERSONAL PROTECTIVE EQUIPMENT MAY BE REQUIRED WHEN SERVICING THIS SYSTEM.
ECO: #99-0000
ONLY AUTHORIZED PERSONNEL SHOULD CONDUCT MAINTENANCE AND/OR SERVICING. BEFORE
CONDUCTING ANY MAINTENANCE OR SERVICING CONSULT WITH AUTHORIZED SUPERVISOR/
10/21/1999
MANAGER.
Teledyne Analytical Instruments
i

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  • Page 1: Operating Instructions

    Model OT-2 System OPERATING INSTRUCTIONS Model OT-2 Oxygen Transmitter System DANGER HIGHLY TOXIC AND OR FLAMMABLE LIQUIDS OR GASES MAY BE PRESENT IN THIS MONITORING P/N: M71265 SYSTEM. PERSONAL PROTECTIVE EQUIPMENT MAY BE REQUIRED WHEN SERVICING THIS SYSTEM. ECO: #99-0000 ONLY AUTHORIZED PERSONNEL SHOULD CONDUCT MAINTENANCE AND/OR SERVICING.
  • Page 2 Any safeguards required such as locks, labels, or redundancy, must be provided by the user or specifically requested of Teledyne at the time the order is placed.

  • Page 3: Table Of Contents

    Model OT-2 System Table of Contents 1 Introduction 1.1 Overview ................ 1-1 1.2 Features ................1-1 1.3 Typical Applications ............1-2 1.4 Operator Interface ............1-3 2 Operational Theory 2.1 Introduction ..............2-1 2.2 Micro-Fuel Cell Sensor ..........2-2 2.2.1 Principles of Operation .......... 2-2 2.2.2 Anatomy of a Micro-Fuel Cell .......
  • Page 4 Model OT-2 System Appendix Specifications ................ A-1 Recommended Spare Parts List .......... A-2 Drawing List ................A-2 Material Safety Data Sheet ..........A-3 The following International Symbols are used throughout the Instruction Manual for your visual and immediate warnings and when you have to attend CAUTION while operating the...

  • Page 5: Introduction

    The Trace Oxygen Transmitter is equipped with two oxygen analysis ranges, 0–10 ppm and 0– 100 ppm (0-100 ppm and 0-1000 ppm optional). The OT-2 System is acceptable for operation in Class 1, Division 2, Groups...

  • Page 6: Typical Applications

    • Flowmeter • Heated cell holder assembly Typical Applications Although the OT-2 System is designed in conjunction with the Elsag Baily Total Flow System for natural gas production, it also is capable of monitoring oxygen at the ppm level in a variety of gases.

  • Page 7: Operator Interface

    Model OT-2 System Introduction 1 Operator Interface The OT-2 System is housed in a rugged metal NEMA-4 case with the display visible from the front and the controls accessible from inside the front door. See Figure 1-1. The front door has a clear Lexan window for viewing the sample system components and transmitter display.

  • Page 8: Introduction

    1 Introduction Model OT-2 System Teledyne Analytical Instruments...
  • Page 9 Model OT-2 System Operational Theory 2 Operational Theory Introduction The OT-2 System is composed of three subsystems: 1. Micro-Fuel Cell Sensor 2. Electronic Signal Processing, Display and Control 3. Sample System The Micro-Fuel Cell is an electrochemical galvanic device that translates the amount of oxygen present in the sample into an electrical output.

  • Page 10: Micro-Fuel Cell Sensor

    Model OT-2 System Micro-Fuel Cell Sensor 2.2.1 Principles of Operation The oxygen sensor used in the Model OT-2 System is a Micro- fuel Cell designed and manufactured by Analytical Instruments. It is a sealed plastic disposable electrochemical transducer. The key components of the Micro-Fuel Cell are a diffusion barrier in the form of a thin membrane, a cathode, an anode, and an electrolyte in which they are immersed.
  • Page 11 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.

  • Page 12: Electrochemical Reactions

    In the absence of oxygen, the output of the sensor is approxi- mately zero. Warning:The sensor used in the Model OT-2 System uses electro- lytes which contain substances that are harmful if touched, swallowed, or inhaled. Avoid contact with ANY fluid or powder in or around the unit.

  • Page 13: The Effect Of Pressure

    Model OT-2 System Operational Theory 2 2.2.4 The Effect of Pressure The Micro-Fuel Cell responds to the partial pressure of oxygen present inside the cell holder. By design, the total gas pressure inside the cell holder is kept approximately the same as the atmospheric pressure. As the atmospheric pressure changes, the partial pressure of oxygen in the cell holder will change accordingly.

  • Page 14: Calibration Characteristics

    2 Operational Theory Model OT-2 System 2.2.5 Calibration Characteristics Given that the total pressure of the sample gas on the surface of the Micro-Fuel Cell input is constant, a convenient characteris- tic of the cell is that the current produced in an external circuit is...

  • Page 15: Electronics And Signal Processing

    Model OT-2 System Operational Theory 2 Electronics and Signal Processing The OT-2 circuitry consists of three stages: an input stage, a temperature compensation/gain stage and an output stage. The input stage consists of a current to voltage converter producing a voltage signal that is proportional to the oxygen concentration as detected by the sensor.

  • Page 16: Sample System

    2 Operational Theory Model OT-2 System Sample System The system consists of a shut off valve, particulate filter, pres- sure regulator, scrubber, calibration selector valve, flow control valve, O transmitter and a sample flow meter and incorporates ¼ inch tube fittings for sample inlet and outlet connections at the side of the enclosure.
  • Page 17 Model OT-2 System Operational Theory 2 Figure 2-5 Piping Layout Figure 2-5 is the Piping Layout of the sampling system. In the standard instrument, calibration gases (zero and span) are con- nected directly to the Span Gas In port by teeing to the port with appropriate valves.
  • Page 18 2 Operational Theory Model OT-2 System 2-10 Teledyne Analytical Instruments...

  • Page 19: Operation 3

    Model OT-2 System Operation 3 Operation Operation of the Model OT-2 System involves installing the unit, making appropriate sample gas connections, and calibration. Installation WARNING: Safe operation of the system requires the user to properly ground the system, install the wiring and power the transmitter.
  • Page 20 3.1.2 Mounting the Analyzer The OT-2 System is designed for bulkhead mounting. Figure 3-1 is an illustration of the OT-2 System and mounting hole dimensions. There are four mounting holes—one in each of the inside corners of the rigid enclosure.

  • Page 21: System Connections

    90-degree arc at a radius of 16 inches. See Figure 3-1. 3.1.3 System Connections Figure 3-2 shows the Model OT-2 System. There are ports for gas inlet and outlet, power and analog concentration output. Figure 3-2 Front View of OT-2 System 3.1.3.1 Gas Connections...

  • Page 22: Electrical Connections

    The span gas source should be regulated at 3 psig. 3.1.3.2 Electrical Connections All electrical connections for the OT-2 System are made on a terminal blocks in the transmitter box located on the inside of the system enclosure, see Figure 3-3.
  • Page 23 Connections Span Figure 3-3 Front View of Transmitter System Power Requirements: The Model OT-2 System requires a 12 VDC (nominal), reverse polarity protected power source. Observe good wiring practices. For hazardous area applications, the Model OT-2 System must be pow- ered by a source that is consistent with intrinsically safe operation.

  • Page 24: Installing The Micro-Fuel Cell

    3 Operation Model OT-2 System Installing the Micro-Fuel Cell The Micro-Fuel Cell is not installed in the cell block when the instrument is shipped. Install it before the analyzer is placed in service. When the micro-Fuel Cell needs to be installed or replaced, follow the procedures in chapter 5, Maintenance, for removing and installing cells.
  • Page 25 Model OT-2 System Operation 3 The span gas cylinder must be equipped with a pressure regulator with a metallic diaphragm. The regulator should be set to approximately 3-5 psig. Rotate the selector valve (a) to the span position and observe the flow meter (b) which should indicate a flow of about 0.4 scfh.
  • Page 26 3 Operation Model OT-2 System 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.

  • Page 27: Exhaust/Vent Line

    Model OT-2 System Operation 3 3.3.3 H S Scrubber The life expectancy of the stainless steel H S scrubber, in- cluded in this system, is determined by the amount of H S passing through it. With the maximum concentration of 200 PPM H S and a flow rate of 0.2 scfh the expected scrubber life will be over 6 months...
  • Page 28 3 Operation Model OT-2 System 3-10 Teledyne Analytical Instruments...

  • Page 29: Maintenance

    (when the sensor is exposed to a constant level of oxygen) throughout their useful life, and then fall off sharply towards zero at the end. Cell failure, in the Model OT-2 System, will probably be indicated by the inability to properly span calibrate the transmitter, or excessively long response time to changes in oxygen concen- tration.
  • Page 30 3. Remove the new cell from its package, and carefully remove the shorting clip. WARNING: The sensor used in the Model OT-2 System uses electrolytes which may contain substances that are harmful if touched, swallowed, or inhaled. Avoid contact with ANY fluid or powder in or around the unit.

  • Page 31: Cell Warranty

    Scrubber Replacement To ensure proper operation of the OT-2 System, it is recom- mended to replace the scrubber every 6 months or more fre- quently if the sensor is reaching end of life prematurely.
  • Page 32 Maintenance Maintenance Maintenance Model OT-2 System Maintenance Maintenance Teledyne Analytical Instruments...
  • Page 33 Model OT-2 System Appendix Appendix Specifications: System Enclosure: NEMA 4 Rated, bulkhead mounted Power Requirements: 9-16 VDC and 16-275mA. Ranges: 0–10ppm and 0–100ppm Oxygen or 0-100 ppm and 0-1000 ppm O Accuracy: ± 2% of full scale at constant temperature and pressure (temperature and pressure of calibra- tion), except ±...

  • Page 34: Teledyne Analytical Instruments

    Appendix Appendix Appendix Appendix Appendix Model OT-2 System Recommended Spare Parts List Qty. Part Number Description C71345A & C71345B Cell Block Insulation Set C70976B PC Board — 1-5V Transmitter (0-100/0-1000 ppm) C70976A PC Board — 1-5V Transmitter (0-10/0-100 ppm) B71343...
  • Page 35 Model OT-2 System Appendix Material Safety Data Sheet Material Safety Data Sheet Material Safety Data Sheet Material Safety Data Sheet Material Safety Data Sheet Section I – Product Identification Product Name: Micro-Fuel Cells Mini-Micro-Fuel Cells, all classes Super Cells, all classes except T–5F Electrochemical Oxygen Sensors, all classes.
  • Page 36 Appendix Appendix Appendix Appendix Appendix Model OT-2 System Section III – Physical Hazards Potential for fire and explosion: The electrolyte in the Micro-Fuel Cells is not flammable. There are no fire or explosion hazards associated with Mi- cro-Fuel Cells. Potential for reactivity: The sensors are stable under normal conditions of use.
  • Page 37 The information is believed to be correct but does not purport to be all inclusive and shall be used only as a guide. Teledyne Analytical Instruments shall not be held liable for any damage resulting from handling or from contact with the above product.
  • Page 38 Appendix Appendix Appendix Appendix Appendix Model OT-2 System Teledyne Analytical Instruments...

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