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OPERATING INSTRUCTIONS FOR
Model 3300PA
Percent Oxygen Analyzer
SERIES 3300 PERCENT OXYGEN
SAMPLE
SPAN
Teledyne Analytical Instruments
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 M69127
ONLY AUTHORIZED PERSONNEL SHOULD CONDUCT M
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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. Warranty This
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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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4.4.1 Alarm 1 .................................................................. 4-3 4.4.2 Alarm 2 .................................................................. 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 Maintenance 5.1 Replacing the Fuse........................................................
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DANGER COMBUSTIBLE GAS USAGE WARNING This is a general purpose instrument designed for usage in a nonhazardous area. It is the customer's responsibility to ensure safety especially when combustible gases are being analyzed since the potential of gas leaks always exist. The customer should ensure that the principles of operating of this equipment is well understood by the user. Misuse of this product in any manner, tampering with its components, or unau- thorized substitution of any component m
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This page left intentionally blank Teledyne Analytical Instruments vi
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Percent Oxygen Analyzer Introduction 1 Introduction 1.1 Overview The Teledyne Electronic Technologies Analytical Instruments (TETAI) Model 3300PA is a microprocessor-based percent oxygen analyzer for real- time measurement of the percent 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 3300PA are monitoring nitrogen generators and inert gas blanketing applications.
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1 Introduction Model 3300PA Operator can select Autoranging, which allows the analyzer to automatically select the proper preset range for a given measurement, or he can lock the analyzer onto a single range. Two concentration alarms with adjustable setpoints. Sensor failure alarm. 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 ind
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Percent Oxygen Analyzer Introduction 1 Set Alarm 2 Sets the Alarm 2 Hi or Low, and the concentration to which alarm 2 activates. Set HI Range Set the high analysis range for the instrument (up to 0-25 %). Set LO Range Set the low analysis range for the instrument (down to 0-1 %). Span Span calibrate the analyzer. Data Entry Keys: Two pushbutton membrane switches are used to manually change measurement parameters of the instrument as they are displayed on the LED meter readout: Up Arr
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1 Introduction Model 3300PA Power Connection 100–240 V ac, at 50/60 Hz. The connector housing includes the fuse holder and the power switch. 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 concentration output, negative ground. Alarm Connections Alarm 1, Alarm 2, and Sensor Failure Alarm conn
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Percent 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 3300PA 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 made of extremely inert plastic (which can be placed confidently in practically any environment or sample stream). It is effec- tively sealed, though one end is permeable to oxygen in the sample gas. At the permeable end a screen retains a diffusion mem
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Percent Oxygen Analyzer Operational Theory 2 The space between the active elements is filled by a structure saturated with electrolyte. Cathode and anode are wet by this common pool. They each have a conductor connecting them, through some electrical circuitry, to one of the external contacts in the connector receptacle, which is on the top of the cell. 2.2.3 Electrochemical Reactions The sample gas diffuses through the Teflon membrane. Any oxygen in the sample gas is reduced on the surface of
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2 Operational Theory Model 3300PA If the pressure changes, the rate that oxygen reaches the cathode through the diffusing membrane will also increase. The electron transfer, and therefore the external current, will increase, even though the proportion of oxygen has not changed. Fortunately, Dalton's Law confirms that every gas in a mixture contributes the same pressure to the mixture that it would exert if it were alone in the same amount in that same volume. This means that as long a
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Percent Oxygen Analyzer Operational Theory 2 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, which is mounted vertically, just behind the rear panel of the Control Unit
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2 Operational Theory Model 3300PA In the presence of oxygen the cell generates a current. This current flows through an internal thermistor compensation network. The output of the sensor is converted to voltage in the millivolt range. This output is fed to a voltage amplifier. The internal thermistor network provides temperature compensation of the sensor output. The resistance of the network changes with temperature, compensating for the changes of the microfuel cell output to tem
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Percent Oxygen Analyzer Installation 3 Installation Installation of the analyzer includes: Overvoltage Category II 1. Unpacking the system. 2. Mounting the Control Unit to a 19" Rack. 3. Installing the Micro-Fuel Cell. 4. Making the electrical connections. 5. Making the gas connections. 6. Testing the installation. CAUTIONS: Read this chapter in its entirety before installing the units. For indoor use only. The Sample must be free of entrained solids or water. How- ever, a high humidity sample
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3 Installation Model 3300PA 3.2 Location and Mounting 3.2.1 Control Unit Installation The 3300PA Control Unit is designed to be rack mounted in a general purpose, indoor area, away from moisture and the elements. The unit should be installed at viewing level in a sheltered area. Refer to the Outline diagram D-69220 for the physical dimensions of the analyzer. 3.2.2 Installing the Micro-Fuel Cell A Micro-Fuel Cell is included as a separate item. It must be installed prior to instrument use. Al
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Percent Oxygen Analyzer Installation 3 Primary Input Power: The power cord receptacle, fuse block and Power switch are located in the same assembly. A 6-foot, standard AC power cord is supplied with the Control Unit. Insert the female plug end of the power cord into the power cord receptacle. The universal power supply allows direct connection to any 100-240 VAC, 50/60Hz power source. The fuse block, to the right of the power cord receptacle, accepts two 3AG, 0.5 A, time-lag (T) fuse. (See Fus
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3 Installation Model 3300PA Figure 3-2: Contact ID for FAILSAFE Relay Operation The specific descriptions for each type of alarm are as follows: Alarm #1 Programmable as high or low alarm. Can be set any- where between 0 and 25 %. Alarm #2 Programmable as high or low alarm. Can be set any- where from 0 to 25 %. Sensor Fail Actuates when the output of the Micro-Fuel Cell sensor falls below the acceptable level (0.05% O ). 2 CAUTION: There could be hazardous voltage at the alarms termi- nals
