OPERATING INSTRUCTIONS FOR

Model 3300ZB

Trace Oxygen Analyzer

P/N M3300ZB

2/11/2014

DANGER

Toxic gases and or flammable liquids may be present in this monitoring system.

Personal protective equipment may be required when servicing this instrument.

Hazardous voltages exist on certain components internally which may persist for a time even after the power is turned off and disconnected.

Only authorized personnel should conduct maintenance and/or servicing.

Before conducting any maintenance or servicing, consult with authorized supervisor/manager.

Teledyne

Copyright © 2014 Teledyne Instruments/ 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

Instruments / Analytical Instruments, 16830 Chestnut Street, City of Industry, CA 91748.

Warranty

This equipment is sold subject to the mutual agreement that it is warranted by us free from defects of material and of construction, and that our liability shall be limited to replacing or repairing at our factory (without charge, except for transportation), or at customer plant at our option, any material or construction in which defects become apparent within one year from the date of shipment, except in cases where quotations or acknowledgements provide for a shorter period. Components manufactured by others bear the warranty of their manufacturer. This warranty does not cover defects caused by wear, accident, misuse, neglect or repairs other than those performed by TI/AI or an authorized service center. We assume no liability for direct or indirect damages of any kind and the purchaser by the acceptance of the equipment will assume all liability for any damage which may result from its use or misuse.

We reserve the right to employ any suitable material in the manufacture of our apparatus, and to make any alterations in the dimensions, shape or weight of any parts, in so far as such alterations do not adversely affect our warranty.

Important Notice

This instrument provides measurement readings to its user, and serves as a tool by which valuable data can be gathered. The information provided by the instrument may assist the user in eliminating potential hazards caused by his process; however, it is essential that all personnel involved in the use of the instrument or its interface, with the process being measured, be properly trained in the process itself, as well as all instrumentation related to it.

The safety of personnel is ultimately the responsibility of those who control process conditions. While this instrument may be able to provide early warning of imminent danger, it has no control over process conditions, and it can be misused. In particular, any alarm or control systems installed must be tested and understood, both as to how they operate and as to how they can be defeated. Any safeguards required such as locks, labels, or redundancy, must be provided by the user or specifically requested of TI/AI at the time the order is placed.

Therefore, the purchaser must be aware of the hazardous process conditions. The purchaser is responsible for the training of personnel, for providing hazard warning methods and instrumentation per the appropriate standards, and for ensuring that hazard warning devices and instrumentation are maintained and operated properly.

Teledyne Instruments/ Analytical Instruments, the manufacturer of this instrument, cannot accept responsibility for conditions beyond its knowledge and control. No statement expressed or implied by this document or any information disseminated by the manufacturer or its agents, is to be construed as a warranty of adequate safety control under the user’s process conditions.

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Trace Oxygen Analyzer

Safety Messages

Your safety and the safety of others is very important. We have provided many important safety messages in this manual. Please read these messages carefully.

A safety message alerts you to potential hazards that could hurt you or others. Each safety message is associated with a safety alert symbol.

These symbols are found in the manual and inside the instrument. The definition of these symbols is described below:

GENERAL WARNING/CAUTION: Refer to the instructions for details on the specific danger. These cautions warn of specific procedures which if not followed could cause bodily

Injury and/or damage the instrument.

CAUTION: H OT S URFACE W ARNING : This warning is specific to heated components within the instrument. Failure to heed the warning could result in serious burns to skin and underlying tissue.

WARNING: E LECTRICAL S HOCK H AZARD : Dangerous voltages appear within this instrument. This warning is specific to an electrical hazard existing at or nearby the component or procedure under discussion. Failure to heed this warning could result in injury and/or death from electrocution.

No

Symbol

Technician Symbol: All operations marked with this symbol are to be performed by qualified maintenance personnel only.

NOTE: Additional information and comments regarding a specific component or procedure are highlighted in the form of a note.

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CAUTION: THE ANALYZER SHOULD ONLY BE USED FOR THE

PURPOSE AND IN THE MANNER DESCRIBED IN

THIS MANUAL.

IF YOU USE THE ANALYZER IN A MANNER OTHER

THAN THAT FOR WHICH IT WAS INTENDED,

UNPREDICTABLE BEHAVIOR COULD RESULT

POSSIBLY ACCOMPANIED WITH HAZARDOUS

CONSEQUENCES.

This manual provides information designed to guide you through the installation, calibration operation and maintenance of your new analyzer. Please read this manual and keep it available.

Occasionally, some instruments are customized for a particular application or features and/or options added per customer requests.

Please check the front of this manual for any additional information in the form of an Addendum which discusses specific information, procedures, cautions and warnings that may be peculiar to your instrument.

Manuals do get lost. Additional manuals can be obtained from

TI/AI at the address given in the Appendix. Some of our manuals are available in electronic form via the internet. Please visit our website at: www.teledyne-ai.com.

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Trace Oxygen Analyzer

Table of Contents

Safety Messages .......................................................................... iii  

Table of Contents .......................................................................... v  

List of Figures .............................................................................. vii  

Introduction ................................................................................... 1  

1.1 Overview 1  

1.2 Main Features of the Analyzer

1.3 Front Panel Description

1.4 Rear Panel Description

1  

2  

3  

Operational Theory ....................................................................... 5  

2.1 Introduction 5  

2.2 Zirconium Oxide Sensors

2.2.1 Principles of Operation

2.2.2 The Effect of Pressure

2.3 Electronics

2.3.1 General

2.3.2 Signal Processing 7  

5  

5  

6  

6  

6  

Installation ..................................................................................... 9  

3.1 Unpacking the Analyzer 9  

3.2 Location and Mounting

3.2.1 Control Unit Installation

10

10

 

 

3.3 Electrical Connections

3.4 Gas Connections

3.5 Installation Checklist

10

13

14  

 

 

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Operation ..................................................................................... 15  

4.1 Introduction 15  

4.2 Using the Function and Data Entry Buttons

4.3 Setting the Analysis Ranges

16

16

 

 

4.3.1 HI Range

4.3.2 LO Range

4.4 Setting the Alarm Setpoints

4.4.1 HI Alarm

4.4.2 LO Alarm

17  

17  

17  

17  

17  

4.4.3 Sensor Fail Alarm

4.5 Selecting a Fixed Range or Autoranging

4.6 Calibration

4.7 LED Display on StartUp

18  

18  

18  

19  

Maintenance ................................................................................ 21  

5.1 Replacing the Fuse

5.2 Sensor Installation or Replacement

5.2.1 When to Replace a Sensor

21

22

22  

 

 

Appendix ...................................................................................... 25  

A.1 Specifications 25  

A.2 Spare Parts List

A.3 Drawing List

26

27

 

 

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Trace Oxygen Analyzer

List of Figures

Figure 1-1: Front Panel .................................................................. 2  

Figure 1-2: Rear Panel .................................................................... 4  

Figure 2-1: Block Diagram of the Signal Processing Electronics .... 7  

Figure 3-1: Rear Panel Electrical Connectors ............................... 11  

Figure 3-2: Contact ID for FAILSAFE Relay Operation ................. 12  

Figure 3-3: Piping Diagram ............................................................ 14  

Figure 4-1: Front Panel Controls and Indicators ............................ 15  

Figure 5-1: AC Fuse Replacement ................................................ 21  

Figure 5-2: ZrO

2

Sensor and Cell Block ........................................ 23  

Figure 5-3 (A&B): Cell Removal/Installation .................................. 23  

DANGER

COMBUSTIBLE GAS USAGE

WARNING

This is a general purpose instrument designed for use in a non-hazardous 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 this equipment are well understood by the user. Misuse of this product in any manner, tampering with its components, or unauthorized substitution of any component may adversely affect the safety of this instrument.

Since the use of this instrument is beyond the control of

Teledyne Instruments/ Analytical Instruments, referred as

TI/AI, no responsibility by TI/AI, its affiliates, and agents for damage or injury from misuse or neglect of this equipment is implied or assumed.

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Trace Oxygen Analyzer

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Trace Oxygen Analyzer Introduction

Introduction

1.1 Overview

The Teledyne Analytical Instruments (TAI) Model 3300ZB is a microprocessor-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.

1.2 Main Features of the Analyzer

The main features of the analyzer include:

 High resolution, accurate readings of oxygen content from 0-10 parts per million (ppm) through 0-1,000 ppm. Large, bright, light-emitting-diode meter readout

 Simple pushbutton controls

 Advanced zirconium oxide measuring technology sensors

 Fast response and recovery time

 Microprocessor based electronics: 8-bit CMOS with on-board

RAM and 16 KB ROM

 Two user selectable ranges (depending on sensor configuration) allow best match to user’s process and equipment

 Operator can select auto-ranging, allowing the analyzer to automatically select the proper preset range for a given measurement or lock the analyzer onto a single range

 Two concentration alarms with adjustable set-points

 Three analog outputs: two for measurement (0–10 VDC and negative ground 4–20 mADC) and one for range identification

(0-10 VDC).

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 Compact and rugged control unit, wall-mounting NEMA-4 rated enclosure.

 External probe

1.3 Front Panel Description

All controls and displays except the power switch are accessible from the front panel. See Figure 1-1. The front panel has seven pushbutton membrane switches, a digital meter, and an alarm indicator

LED for operating the analyzer. These features are described briefly here and in greater detail in Chapter 4 Operation.

Figure 1-1: Front Panel

Function Keys: Seven pushbutton membrane switches are used to select the function performed by the analyzer:

 Set HI Alarm Set the concentration ABOVE which an alarm activates.

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Trace Oxygen Analyzer Introduction

 Set LO Alarm Set the concentration BELOW which an alarm activates.

 Set HI Range Set the high analysis range for the instrument (up to 0-1,000 ppm).

 Set LO Range Set the low analysis range for the instrument (down to 0-1,000 ppm).

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 Arrow Increment values of parameters upwards as they are displayed on the LED readout.

 Down Arrow Increment values of parameters downwards as they are displayed on the

LED readout.

Digital LED Readout: The digital display is a LED device that produces large, bright, 7-segment numbers that are legible in any lighting environment. It has two functions:

 Meter Readout

As the meter readout, it displays the oxygen concentration currently being measured.

 Measurement Parameters Readout

It also displays user-definable alarm setpoints, ranges, and span calibration point when they are being checked or changed.

1.4 Rear Panel Description

The rear panel contains the electrical input and output connectors.

Separate rear panel illustrations are shown in Figure 1-2 for the AC and

DC powered versions of the instrument. The connectors are described briefly here and in detail in the Chapter 3 - Installation.

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Figure 1-2: Rear Panel

 Power Connection

AC Power: 100–240 VAC, 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 (I) or OFF (O).

 Analog Outputs 0–10 VDC concentration output.

0–10 VDC Range ID (or optional over-range) output.

4–20 mADC concentration output, negative ground.

 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.

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Trace Oxygen Analyzer Operational Theory

Operational Theory

2.1 Introduction

The analyzer is composed of three subsystems:

1. Analysis unit with zirconium oxide sensor(s)

2. Control unit with signal processing, display and controls

3. Interface unit, supplying signals between 1 and 2.

The analysis unit is designed to accept the sample gas and direct it to the sensitive surface of the zirconium oxide sensor.

The control unit processes the sensor output and translates it into an electrical concentration, which supplies the customer with range, alarm outputs, and a meter readout giving the trace oxygen level. It contains a microcontroller that manages all signal processing, input/output, and display functions for the analyzer.

The interface unit receives power from the control unit, and creates precision heater and bias voltages for the zirconium oxide sensor.

2.2 Zirconium Oxide Sensors

2.2.1 Principles of Operation

Teledyne’s zirconium oxide sensor is a miniature solid state sensor. It uses a stabilized zirconia disc as an electrolyte with a sensing electrode (the cathode) and a counter electrode (the anode) on each side of the disc. The zirconia is heated to a temperature of about 500°C via a built-in heater. By applying a suitable reference voltage across the cathode and anode, the heated zirconia acts as an electrolyte which is capable of moving oxygen ions within its crystalline structure. This allows for the reduction of oxygen molecules reaching the cathode and the generation of a current equivalent to the amount of oxygen in a sample measured in parts per million (ppm).

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Operational Theory Model 3300ZB

The sensor is designed for long term stability with an operating life of 5 years.

This unit features one or two sensors, and can be custom-designed for a specific range of oxygen analysis.

2.2.2 The Effect of Pressure

In order to state the amount of oxygen present in the sample as a specific portion of the gas mixture, it is necessary that the sample diffuse into the sensors under constant pressure.

If the total pressure increases, the rate that oxygen reaches the sensors will also increase. The electron transfer, and therefore the external current, will increase, even though the proportion of oxygen has not changed. It is therefore important that the sample pressure at the sensors, (usually vent pressure) remain relatively constant between calibrations.

2.3 Electronics

2.3.1 General

The signal processing uses a 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.

The signal processing electronics, which includes the signal amplifiers, microcontroller, analog to digital converter, and digital to analog converter, are located on the Main PCB. It is mounted vertically just behind the front panel of the control Unit.

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Trace Oxygen Analyzer Operational Theory

2.3.2 Signal Processing

Figure 2-1 is a block diagram of the signal processing electronics described below.

Figure 2-1: Block Diagram of the Signal Processing Electronics

In the presence of oxygen, the sensor(s) produce a current. A current to voltage amplifier (I–E AMPL) converts this current to a voltage.

The output from the I-E amplifier and subsequent buffer circuit (not shown) is sent to an analog to digital converter (ADC), and the resulting digital concentration signal is sent to the micro controller.

The digital concentration signal along with input from the front panel buttons (KEYBOARD) is processed by the micro controller, and appropriate output signals are directed to the display, alarm relays, and

Teledyne 7

Operational Theory Model 3300ZB

RS-232 (optional) output. The same digital information is also sent to a

8-bit digital to analog converter (DAC) that produces the 0-10 VDC analog concentration signal and the 0-10 VDC analog range ID output.

A current to voltage converter (E–I CONV) produces the 4-20 mADC analog concentration signal.

Teledyne Analytical Instruments 8

Trace Oxygen Analyzer Installation

Installation

Installation of the analyzer includes:

1. Unpacking the system.

2. Mounting the control unit to a wall.

3. Making the electrical connections.

4. Making the gas connections.

5. Testing the installation.

CAUTION: READ THIS CHAPTER IN ITS ENTIRETY BEFORE

INSTALLING THE UNITS.

THE MODEL 3300ZB IS FOR INDOOR USE ONLY.

THE SAMPLE MUST BE FREE OF ENTRAINED

SOLIDS, WATER, OR COMBUSTIBLE COMPOUNDS.

3.1 Unpacking the Analyzer

As soon as you receive the instrument, carefully unpack and inspect control unit, external probe, and any included accessories for damage.

Immediately report any damage to the shipping agent. The analyzer is shipped with all materials needed to install and prepare the system for operation.

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3.2 Location and Mounting

3.2.1 Control Unit Installation

The 3300ZB control unit is designed to be wall-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.

CAUTION: FOR THE DC POWERED VERSION, THE CONTROL

UNIT CHASSIS MUST BE ISOLATED FROM THE

INPUT POWER GROUND.

Refer to the Outline Diagram for the physical dimensions of the analyzer, which can be found at the back of the manual.

3.3 Electrical Connections

Figure 3-1 shows the Model 3300ZB rear panel.

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-

240VAC, 50/60 Hz power source. The fuse block, to the right of the power cord receptacle, accepts a 5

 20 mm, 0.5A time-delay fuse (see

Fuse Replacement in Chapter 5 - Maintenance).

The power switch is located on the right-hand end of the power source input receptacle assembly.

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Trace Oxygen Analyzer Installation

Figure 3-1: Rear Panel Electrical Connectors

Analog Outputs: There are three DC output signal connectors with screw terminals on the panel. There are two wires per output with the polarity noted. See Figure 3-1. The outputs are:

0–10 V Concentration: Voltage is proportional to oxygen reading, from

0 V at 0 ppm oxygen to 10 V at full scale ppm oxygen. (Full scale = 100% of programmed range).

0–10 V Range ID: 3.33 V = Low Range, 6.66 V = High Range

4–20 mA % Range: Current is proportional to oxygen reading, from 4 mA at 0 ppm oxygen to 20 mA at full scale ppm oxygen. (Full scale = 100% of programmed range).

Alarm Relays: The three alarm circuit connectors are screw terminals for making connections to internal alarm relay contacts. There is one set of contacts for each type of alarm. Contacts are Form C, with normally open and normally closed contact connections capable of switching up to 0.5A at 125 VAC into a resistive load.

The alarm relay circuits are designed for failsafe operation, meaning the relays are energized during normal operation. If power fails the relays de-energize (alarms activated).

The contact connections are indicated diagrammatically on the rear panel as normally closed (NC), common (C), and normally open (NO).

Figure 3-2 explains how these act in failsafe operation.

The specific descriptions for each type of alarm are as follows:

HI Alarm

LO Alarm

Sensor Fail

Configured as high alarm (actuates when concentration is above threshold). Can be set anywhere within the full range of the analyzer (1-

1,000 ppm), but must be set ABOVE the threshold set for the LO Alarm.

Configured as low alarm (actuates when concentration is below threshold) within the full range of the analyzer (1-1,000 ppm), but must be set

BELOW the threshold set for the HI Alarm.

Not active in this product

Figure 3-2: Contact ID for FAILSAFE Relay Operation

RS-232 Port: The digital signal output RS-232 port is offered as a cost added option on the Model 3300ZB. It is a standard RS-232 serial communications port used to connect the analyzer to a modem or other digital device. The connector is a standard 9-pin serial connector. Pinouts are listed in Table 3-1.

Table 3-1: RS-232 Signals

RS-232 Sig RS-232 Pin Purpose

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Trace Oxygen Analyzer Installation

The RS-232 protocol allows some flexibility in implementation in the choice of values for certain parameters. Table 3-2 lists the RS-232 values required by the Model 3300ZB implementation.

Table 3-2: Required RS-232 Options

Parameter Setting

Message Rate 2 per second

3.4 Gas Connections

The standard Model 3300ZB has two inlet (sample and span) and one outlet port. All connections have 1/8” tube fittings installed. A switching valve is provided to feed the unit with either sample or calibration gas as shown in Figure 3-3.

A flowmeter and flow controller valve are part of the system and will assist in setting the flow of the gas.

Sample flow should be adjusted to 2 SCFH. The sample vent connection should not restrict the sample flow. The sensor is designed to operate at atmospheric pressure. Restricting the sample vent line will result in pressurizing the sensor and altering the O

2

reading.

The pressure required will depend on the sampling system. When venting into a constant pressure, such as the atmosphere, controlling input pressure is simple. If you are venting into a system of varying pressure, then some form of pressure regulation is required to maintain a constant pressure.

Sample and span pressure must NOT exceed 50 psig (345 Kpa).

Figure 3-3 shows a standard piping diagram for positive pressure service.

Figure 3-3: Piping Diagram

3.5 Installation Checklist

Before connecting the instrument to a power source and applying power, make sure you have:

 Correctly installed the sample and exhaust gas lines

 Checked for leaks

 Set the sample pressure to 5-10 psig nominal

Once the above checks have been made, you can apply power. The instrument is now ready for operation.

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Trace Oxygen Analyzer Operation

Operation

4.1 Introduction

Once the analyzer has been mounted, the gas lines connected, and the electrical connections made, the analyzer can be configured for your application. This involves setting the system parameters as follows:

 Defining the user-selectable analysis ranges

 Setting alarm set-points.

 Calibrating the instrument

All of these functions are performed via the front panel controls, shown in Figure 4-1.

Analyzing a gas sample for the percent oxygen level through the cell block is the default mode of operation. The analyzer is monitoring the oxygen level as long as no front panel buttons have been pressed.

Figure 4-1: Front Panel Controls and Indicators

4.2 Using the Function and Data Entry Buttons

When one of the function buttons is being pressed, the analyzer is in the Setup mode or the Calibration mode.

The four setup function buttons on the analyzer are:

 SET HI ALARM

 SET LO ALARM

 SET HI RANGE

 SET LO RANGE

The Calibration mode button is:

 SPAN

The data entry buttons (

 and ) adjust the value displayed on the

TRACE OXYGEN meter while one of the function buttons is being held down.

  : Increments the displayed value upwards.

  : Increments the displayed value downwards.

Any of the functions can be selected at any time by pressing the appropriate button.

Each function will be described in the following sections. Although the operator can use any function at any time, the order chosen in this manual is appropriate for an initial setup.

4.3 Setting the Analysis Ranges

The two user-definable analysis ranges are both capable of being adjusted from 0-10 ppm to 0-1,000 ppm oxygen concentration.

The analyzer automatically switches from the LO range to the

HI range when the oxygen concentration reaches the LO range fullscale value. It will switch back to the LO range when the oxygen concentration falls below the LO range full-scale value

Note: The HI Range set-point MUST be set at a higher concentration than the LO Range set-point.

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Trace Oxygen Analyzer Operation

4.3.1 HI Range

Setting the HI Range full-scale value defines the LEAST sensitive analysis range to be used. To set the HI Range:

1. Press the SET HI RANGE function button once.

2. Immediately (within 5 seconds) press either the

 or  button to raise or lower the displayed value as required, until the display reads the desired full-scale concentration.

4.3.2 LO Range

Setting the LO Range full-scale value defines the MOST sensitive range to be used. To set the LO Range:

1. Press the SET LO RANGE function button once.

2. Immediately (within 5 seconds) press either the

 or  button to raise or lower the displayed value as required, until the display reads the desired full-scale concentration.

4.4 Setting the Alarm Setpoints

The alarm set-points can be adjusted over the full range of the analyzer (0-1,000 ppm oxygen content). The set-point values are expressed in ppm only.

Note: The HI Alarm set-point MUST be set at a higher concentration than the LO Alarm set-point.

4.4.1 HI Alarm

Setting the HI Alarm sets the value ABOVE which the HI Alarm will activate. To Set the HI Alarm:

1. Press the SET HI ALARM function button once.

2. Within 5 seconds press either the

 or  button to raise or lower the displayed value as required, until the display reads the desired concentration.

4.4.2 LO Alarm

Setting the LO Alarm sets the value BELOW which the LO alarm will activate. To set the LO Alarm:

1. Press the SET LO ALARM function button once.

2. Within 5 seconds press either the

 or  button to raise or lower the displayed value as required, until the display reads the desired concentration.

4.4.3 Sensor Fail Alarm

Not active in this product.

4.5 Selecting a Fixed Range or Autoranging

The Model 3300ZB can operate in fixed high, fixed low, or autoranging mode. To change modes:

1. Press and then release the SET HI RANGE and the SET LO

RANGE buttons simultaneously.

2. Within 5 seconds press either the

 or  button until Auto, Lo, or Hi displays on the LCD, as desired.

After about three seconds, the analyzer resumes monitoring in the selected range mode.

4.6 Calibration

Power up the analyzer and allow the LED reading to stabilize. Wait at least ten minutes after powering, giving the heater and bias voltages enough time to reach operating voltage. Set the alarm set-points and the full-scale ranges to the desired values.

Procedure:

1. Apply calibration gas of a known concentration. A span gas containing an oxygen content of 60-100% of the range of the analyzer is recommended.

Note: If the analyzer output goes above the high alarm set-point or below the low alarm set-point, the front panel ALARM

Indicator located beneath the SET function buttons will blink.

When the SPAN key is pressed, the alarm indicator will stop blinking.

2. Press the SPAN button once. The value on the LED display will blink for 60 seconds while the display tracks the O

2 concentration in the span gas.

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Trace Oxygen Analyzer Operation

3. As the display is blinking, once the readout appears stable, press either the

 or  button to adjust the reading to coincide with the oxygen concentration of the span gas. Once set, the unit will enter Analyze Mode after approximately five seconds after the last key press.

Note: If no key presses are made during the 60 second period when the display is blinking, the analyzer will accept the display value as the true span concentration and automatically leave the span mode. The display will cease blinking.

The unit is now calibrated.

If the output of the sensor is outside of the expected range, this may be caused by:

a) Bad electrical connection between the controler and sensor.

b) Improperly analyzed or entered calibration gas value

c) Electronics

The unit will not accept the attempted calibration and will flash

‘0000’ on the LED display unit a valid calibration is performed.

4.7 LED Display on StartUp

When the unit is powered, it will initially display “8.8.8.8” for a short period of time. This is to confirm all LED segments are functioning. Afterward, the LED display will initiate a delay countdown, allowing the sensor’s heater to begin charging and capture a zero reading. Flowing “zero” gas or a sensor is not needed for this instrument adjustment.

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Trace Oxygen Analyzer Maintenance

Maintenance

Aside from normal cleaning and checking for leaks at the gas connections, the Model 3300ZB should not require any maintenance beyond replacement of zirconium oxide sensors, and perhaps a blown fuse. Routine maintenance includes occasional recalibration, as described in Chapter 4 Operation.

5.1 Replacing the Fuse

If a fuse blows, check first to determine the cause, then replace the fuse using the following procedure:

1. Disconnect the AC power and place the power switch located on the rear panel in the O position. Remove the power cord from the receptacle.

2. The fuse receptacle is located in the power cord receptacle assembly in the upper left-hand corner of the rear panel. See

Figure 5-1.

Figure 5-1: AC Fuse Replacement

3. Insert a small flat-blade screwdriver into the slot in the receptacle wall nearest the fuse and gently pry open the fuse receptacle. The fuse holder will slide out. The fuse in use is visible in the clip.

To open the spare fuse compartment, push on one end until it slides out.

4. Remove the bad fuse and replace it with a 5

20 mm 0.5 A,

250 VAC, IEC, time lag (T) fuse (P/N F1128) for AC units.

5. Replace the fuse holder into its receptacle, pushing in firmly until it clicks.

5.2 Sensor Installation or Replacement

5.2.1 When to Replace a Sensor

The sensors used in this product will typically last five years or longer in service. Typically, the sensors will fail either high or low.

Inaccurate or erratic readings are a sign that one of the sensors may have failed. In most cases, we recommend the entire unit be returned to an authorized Teledyne Service Center for sensor replacement.

To replace the sensor, refer to Figures 5-2 and 5-3 and follow the procedure below:

1. If required, purge the lines with nitrogen to remove any toxic or combustible gas from the cell.

2. Remove power from the instrument. Wait at least 1/2 hour to allow the sensor to cool.

3. Unscrew the collar to separate the sensor cap from the sensor block. See Figure 5-3 (A).

4. Carefully lift up the ZrO

2

sensor off the PCB and replace with a new sensor. Align the tab of the sensor with the tab shown on the silkscreen of the sensor PCB as shown in the inset of Figure 5-3

(B). Make sure the pins on the sensor mate properly with the sockets on the PCB. Without touching the membrane surface, push the sensor down until the pins seat in the sockets.

5. Replace the cap and screw the collar onto the block threads.

6. Apply power to the analyzer and flush the sensor block with nitrogen for 20 minutes to remove trapped air.

Teledyne Analytical Instruments 22

Trace Oxygen Analyzer Maintenance

Figure 5-2: ZrO

2

Sensor and Cell Block

Figure 5-3 (A&B): Cell Removal/Installation

(Rack mounting model shown)

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Teledyne Analytical Instruments 24

Trace Oxygen Analyzer Appendix

Appendix

A.1 Specifications

Ranges: Two user selectable ranges can be set between 0-10 ppm and 0-1,000 ppm oxygen. Default ranges are 0-100 ppm and

0-1,000 ppm oxygen

Current: 4-20 mA, negative ground

Display: Light-emitting diode (LED) display

Alarms: One high alarm relay, adjustable; one low alarm relay, adjustable; one sensor failure relay. All alarms failsafe.

System Operating Temp: 0 - 50°C

Accuracy: ±2% of full scale at constant temperature

±5% of full scale over 0-50°C range once temperature equilibrium is reached (at 3% and 5% user defined ranges).

Dimensions (Approx.) 8” W x 10” H x 6” D

A.2 Spare Parts List

1 C-64586A PC Board, Power Supply

2

1

F-1130

S-1439

Fuse (AC), ½A, 250 VAC

IEC Type T, 5x20mm

Sensor, 0-1,000 ppm, zirconium oxide

IMPORTANT: Orders for replacement parts should include the part number and the model and serial number of the system for which the parts are intended.

Send orders to:

TELEDYNE ANALYTICAL INSTRUMENTS

16830 Chestnut Street

City of Industry, CA 91748

Telephone: (626) 934-1500

Fax: (626) 961-2538

Web: www.teledyne-ai.com or your local representative.

Teledyne Analytical Instruments 26

Trace Oxygen Analyzer

A.3 Drawing List

Appendix