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Trace Oxygen Analyzer
OPERATING INSTRUCTIONS FOR
Model 3020T
Trace Oxygen Analyzer
DANGER
HIGHLY TOXIC AND OR FLAMMABLE LIQUIDS OR GASES MAY BE PRESENT IN THIS
MONITORING SYSTEM.
PERSONAL PROTECTIVE EQUIPMENT MAY BE REQUIRED WHEN SERVICING THIS SYSTEM.
HAZARDOUS VOLTAGES EXIST ON CERTAIN COMPONENTS INTERNALLY WHICH MAY PER-
P/N M65908
SIST FOR A TIME EVEN AFTER THE POWER IS TURNED OFF AND DISCONNECTED.
11/22/99
ONLY AUTHORIZED PERSONNEL SHOULD CONDUCT MAINTENANCE AND/OR SERVICING.
BEFORE CONDUCT
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Model 3020T Copyright © 1999 Teledyne Analytical Instruments All Rights Reserved. No part of this manual may be reproduced, transmitted, tran- scribed, stored in a retrieval system, or translated into any other language or computer language in whole or in part, in any form or by any means, whether it be electronic, mechanical, magnetic, optical, manual, or otherwise, without the prior written consent of Teledyne Analytical Instruments, 16830 Chestnut Street, City of Industry, CA 91749-1580. War
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Trace Oxygen Analyzer Specific Model Information The instrument for which this manual was supplied may incorporate one or more options not supplied in the standard instrument. Commonly available options are listed below, with check boxes. Any that are incorporated in the instrument for which this manual was supplied are indicated by a check mark in the box. Instrument Serial Number: __________________________ The instrument with the above serial number has the following Options: ❏ 3020T-C Three
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Model 3020T Table of Contents 1 Introduction 1.1 Overview ........................................................................ 1-1 1.2 Typical Applications....................................................... 1-1 1.3 Main Features of the Analyzer ....................................... 1-1 1.4 Model Designations ....................................................... 1-2 1.5 Operator Interface .......................................................... 1-3 1.5.1 UP/DOWN Switch..............
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Trace Oxygen Analyzer 3.5 Gas Connections .......................................................... 3-12 3.6 Testing the System ........................................................ 3-14 4 Operation 4.1 Introduction .................................................................... 4-1 4.2 Using the Controls ......................................................... 4-1 4.2.1 Mode/Function Selection ....................................... 4-2 4.2.1.1 Analysis Mode ..........................
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Model 3020T 5.3.4 Installing a New Micro-Fuel Cell.............................. 5-6 5.2.5 Cell Warranty ........................................................... 5-6 5.4 Fuse Replacement......................................................... 5-7 5.5 System Self Diagnostic Test........................................... 5-7 Appendix A-1 Specifications ................................................................ A-1 A-2 Recommended 2-Year Spare Parts List ......................... A-3 A
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Trace Oxygen Analyzer Introduction 1 Introduction 1.1 Overview The Teledyne Analytical Instruments Model 3020T Trace Oxygen Analyzer is a versatile microprocessor-based instrument for detecting oxygen at the parts-per-million (ppm) level in a variety of gases. This manual covers the Model 3020T, trace oxygen, explosion-proof, bulkhead-mount units only. 1.2 Typical Applications A few typical applications of the Model 3020T are: • Monitoring inert gas blanketing • Air separation and liquefaction
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1 Introduction Model 3020T • Advanced Micro-Fuel Cell, redesigned for trace analysis, has an expected life of one year. • Versatile analysis over a wide range of applications. • Microprocessor based electronics: 8-bit CMOS microprocessor with 32 kB RAM and 128 kB ROM. • Three user definable output ranges (from 0-10 ppm through 0- 250,000 ppm) allow best match to users process and equipment. • Air-calibration range for convenient spanning at 20.9 %. • Auto Ranging allows analyzer to automati
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Trace Oxygen Analyzer Introduction 1 1.5 Operator Interface All controls and displays on the standard 3020T are accessible from outside the housing. The instrument has two simple operator controls. A digital meter, an alphanumeric display, and a sample flowmeter give the operator constant feedback from the instrument. See Figure 1-1. The controls are described briefly here and in greater detail in chapter 4. Figure 1-1: Model 3020T Controls, Indicators, and Connectors Teledyne Analytical Inst
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1 Introduction Model 3020T 1.5.1 UP/DOWN Switch Functions: The UP/DOWN switch is used to select the function to be performed. Choose UP or DOWN to scroll through the following list of eleven functions: • Auto-Cal Set up an automatic calibration sequence. • PWD Install a password to protect your analyzer setup. • Logout Locks Setup Mode. • Version Displays model and version of analyzer. • Self-Test Runs internal diagnostic program, displays results. • Span Span calibrate the analyzer. • Zero
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Trace Oxygen Analyzer Introduction 1 1.5.3 Displays Digital Meter Display: The meter display is a LED device that produces large, bright, 7-segment numbers that are legible in any lighting. It produces a continuous readout from 0-10,000 ppm and then switches to a continuous percent readout from 1-25%. It is accurate across all analysis ranges without the discontinuity inherent in analog range switching. Alphanumeric Interface Screen: The VFD screen is an easy-to-use interface from operator to
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1 Introduction Model 3020T • Alarm Connections 2 concentration alarms and 1 system alarm. • RS-232 Port Serial digital concentration signal output and control input. • Remote Valves Used for controlling external solenoid valves, if desired. Figure 1-2: Electrical Connector Panel Teledyne Analytical Instruments 1-6
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Trace Oxygen Analyzer Introduction 1 • Remote Sensor Used for external sensor and thermocouple, if desired. • Remote Span/Zero Digital inputs allow external control of analyzer calibration. • Calibration Contact To notify external equipment that instrument is being calibrated and readings are not monitoring sample. • Range ID Contacts Four separate, dedicated, range relay contacts. Low, Medium, High, Cal. • Network I/O Serial digital communications for local network access. For future expansio
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1 Introduction Model 3020T Optional: • Calibration Gas Ports Separate fittings for zero, span and sample gas input, plus internal valves for automatically switching the gases in sync with the 3020 electronics. Note: If you require highly accurate Auto-Cal timing, use external Auto-Cal control where possible. The internal clock in the Model 3020T is accurate to 2-3 %. Accordingly, internally scheduled calibrations can vary 2-3 % per day. Teledyne Analytical Instruments 1-8
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Trace Oxygen Analyzer Operational Theory 2 Operational Theory 2.1 Introduction The analyzer is composed of three subsystems: 1. Micro-Fuel Cell Sensor 2. Sample System 3. Electronic Signal Processing, Display and Control The sample system is designed to accept the sample gas and transport it through the analyzer without contaminating or altering the sample prior to analysis. The Micro-Fuel Cell is an electrochemical galvanic device that translates the amount of oxygen present in the sample into
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2 Operational Theory Model 3020T 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 1¼ inches thick. It is made of an extremely inert plastic, which can be placed confidently in practically any environment or sample stream. It is effectively sealed, although one end is permeable to oxyge
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Trace Oxygen Analyzer Operational Theory 2 At the top end of the cell is a diffusion membrane of Teflon, whose thickness is very accurately controlled. Beneath the diffusion membrane lies 2 the oxygen sensing element—the cathode—with a surface area almost 4 cm . The cathode has many perforations to ensure sufficient wetting of the upper surface with electrolyte, and it is plated with an inert metal. The anode structure is below the cathode. It is made of lead and has a proprietary design which
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2 Operational Theory Model 3020T The overall reaction for the fuel cell is the SUM of the half reactions above, or: 2Pb + O → 2PbO 2 (These reactions will hold as long as no gaseous components capable of oxidizing lead—such as iodine, bromine, chlorine and fluorine—are present in the sample.) The output of the fuel cell is limited by (1) the amount of oxygen in the cell at the time and (2) the amount of stored anode material. In the absence of oxygen, no current is generated. 2.2.4 The Effe
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Trace Oxygen Analyzer Operational Theory 2 Figure 2-3. Characteristic Input/Output Curve for a Micro-Fuel Cell 2.3 Sample System The sample system delivers gases to the Micro-Fuel Cell sensor from the analyzer gas panel inlets. Depending on the mode of operation either sample or calibration gas is delivered. The Model 3020T sample system is designed and fabricated to ensure that the oxygen concentration of the gas is not altered as it travels through the sample system. The sample encoun
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2 Operational Theory Model 3020T Figure 2-4 is the flow diagram for the sampling system. In the standard instrument, calibration gases (zero and span) can be connected directly to the Sample In port by teeing to the port with appropriate valves. The shaded portion of the diagram shows the components added when the –C and/or F options are ordered. The valves, when supplied, are installed inside the 3020T enclosure and are regulated by the instruments internal electronics. The flame arrestors
