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OPERATING INSTRUCTIONS
FOR
Model 3190 Series
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 PERSIST FOR A
TIME EVEN AFTER THE POWER IS TURNED OFF AND DISCONNECTED.
P/N M64641
ONLY AUTHORIZED PERSONNEL SHOULD CONDUCT MAINTENANCE AND/OR SERVICING. BEFORE
06/21/2000
CONDUCTING ANY MAINTENA
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Copyright © 1999 Teledyne Analytical Instruments All Rights Reserved. No part of this manual may be reproduced, transmitted, transcribed, 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. Warranty This eq
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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 is supplied are indicated by a check mark in the box. Instrument Serial Number: _______________________ Options Included in the Instrument with the Above Serial Number: ❑❑ ❑❑❑ Class A-2C Micro-Fuel Cell: For 0-100%
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Contents Introduction 1.1 Overview ........................................................................ 1-1 1.2 Main Features of the Analyzer ....................................... 1-1 1.3 Front Panel Description.................................................. 1-2 1.4 Rear Panel Description .................................................. 1-3 Operational Theory 2.1 Introduction .................................................................... 2-1 2.2 Micro-Fuel Cell Sensor ..........
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4.4 Setting the Alarm Setpoints............................................ 4-3 4.4.1 HI Alarm ................................................................. 4-3 4.4.2 LO Alarm ................................................................ 4-3 4.4.3 Sensor Fail Alarm .................................................. 4-4 4.5 Selecting a Fixed Range or Autoranging ....................... 4-4 4.6 Calibration ..................................................................... 4-4 4.7 Display
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vi Teledyne Analytical Instruments
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Trace Oxygen Analyzer Introduction 1 Introduction 1.1 Overview The Teledyne Analytical Instruments (TAI) Model 3190 is a micropro- cessor-based trace oxygen analyzer for real-time measurement of trace amounts of oxygen in inert gases, or in a wide variety of gas mixtures. It features simple operation, fast response, and a compact, rugged construction. Typical applications of the Model 3190 are monitoring nitrogen generators and inert gas blanketing applications. 1.2 Main Features of the Analyz
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1 Introduction Model 3190 Two concentration alarms with adjustable setpoints. Sensor failure alarm. RS-232 serial digital port for output of concentration and range data to a computer, terminal, or other digital device. Three analog outputs: two for measurement (0–10 V dc, and negative ground 4–20 mA dc) and one for range identification (0-10 V dc). Compact and rugged Control Unit with flush-panel case. Designed for indoor use. Front panel NEMA-4 rated. External Probe can be loca
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Trace Oxygen Analyzer Introduction 1 Set HI Alarm Set the concentration ABOVE which an alarm activates. Set LO Alarm Set the concentration BELOW which an alarm activates. Set HI Range Set the high analysis range for the instrument (up to 0-9999 ppm). Set LO Range Set the low analysis range for the instrument (down to 0-10 ppm). Span Span calibrate the analyzer. Data Entry Keys: Two pushbutton membrane switches are used to manually change measurement parameters of the instrument as th
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1 Introduction Model 3190 Figure 1-2 Rear Panel (AC and DC versions) Power Connection AC version: 100–240 V ac, at 50/60 Hz. The connector housing includes the fuse holder and the power switch. DC version: Requires between 10 and 36 V dc. Fuse Holder: Replacing the fuse is described in Chapter 5, Maintenance. I/O Power Switch: Turns the instrument power ON (1) or OFF (0). Analog Outputs 0–10 V dc concentration output. 0–10 V dc range ID (or optional overrange) output. 4–20 mA dc concentr
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Trace Oxygen Analyzer Introduction 1 Alarm Connections HI Alarm, LO Alarm, and Sensor Failure Alarm connections. RS-232 Port Serial digital output of concentration and range signals. External Probe Connects to the Remote Probe or remote Analysis Unit. Teledyne Analytical Instruments 1-5
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1 Introduction Model 3190 1-6 Teledyne Analytical Instruments
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Trace Oxygen Analyzer Operational Theory 2 Operational Theory 2.1 Introduction The analyzer is composed of two subsystems: 1. Analysis Unit with Micro-Fuel Cell Sensor 2. Control Unit with Signal Processing, Display and Controls The Analysis Unit is designed to accept the sample gas and direct it to the sensitive surface of the Micro-Fuel Cell sensor. The Micro-Fuel Cell is an electrochemical galvanic device that translates the amount of oxygen present in the sample into an electrical current.
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2 Operational Theory Model 3190 stored within the cell, whereas in the Micro-Fuel Cell, one of the reactants (oxygen) comes from outside the device as a constituent of the sample gas being 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 1 inch thick. It is made of extremely ine
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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 the oxygen sensing element—the cathode—with a surface area almost 2 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 3190 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 only likely components are the halogens.) 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 Effect of Pressure In order to state
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Trace Oxygen Analyzer Operational Theory 2 Figure 2-2. Characteristic Input/Output Curve for a Micro-Fuel Cell 2.3 Electronics 2.3.1 General The signal processing uses an Intel microcontroller with on-board RAM and ROM to control all signal processing, input/output, and display functions for the analyzer. System power is supplied from a universal power supply module designed to be compatible with most international power sources. The power supply circuitry is on the Power Supply PCB, w
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2 Operational Theory Model 3190 Figure 2-3: Block Diagram of the Signal Processing Electronics In the presence of oxygen the cell generates a current. A current to voltage amplifier (I–E AMPL) converts this current to a voltage. The second stage amplifier (TEMP COMP) supplies temperature compensation for the oxygen sensor output. The temperature compensation amplifier incorporates a thermistor (THERM) that is physically located in the cell block. The thermistor is a temperature depen
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Trace Oxygen Analyzer Installation 3 Installation Installation of the analyzer includes: Overvoltage Category II 1. Unpacking the system. 2. Mounting the Control Unit, External Sample Block, and Micro- Fuel Cell sensor. 3. Making the electrical connections. 5. Making the gas connections. 6. Testing the installation. CAUTIONS: Read this chapter in its entirety before installing the units. The Model 3190 is for or indoor use only. The sample must be free of entrained solids or water. However, a h
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3 Installation Model 3190 shipped with all the materials you need to install and prepare the system for operation. CAUTION: Do not disturb the integrity of the cell package until the cell is to be used immediately. If the cell package is punctured prematurely and air is permitted to enter, cell life will be shortened. 3.2 Location and Mounting 3.2.1 Control Unit Installation The 3190 Control Unit is designed to be panel-mounted in a general purpose, indoor area, away from moisture and the ele
