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 Analytical Instruments
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: HOT SURFACE WARNING: 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: ELECTRICAL SHOCK HAZARD: 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.
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.
No
Symbol
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Model 3300ZB
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:
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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
3
1.2 Main Features of the Analyzer
1.3 Front Panel Description
1.4 Rear Panel Description
Operational Theory .......................................................................5
2.1 Introduction
5
5
5
6
6
6
7
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
Installation .....................................................................................9
3.1 Unpacking the Analyzer
3.2 Location and Mounting
3.2.1 Control Unit Installation
3.3 Electrical Connections
3.4 Gas Connections
9
10
10
10
13
14
3.5 Installation Checklist
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Model 3300ZB
Operation ..................................................................................... 15
4.1 Introduction
15
16
16
17
17
17
17
17
18
18
18
19
4.2 Using the Function and Data Entry Buttons
4.3 Setting the Analysis Ranges
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
4.4.3 Sensor Fail Alarm
4.5 Selecting a Fixed Range or Autoranging
4.6 Calibration
4.7 LED Display on StartUp
Maintenance ................................................................................ 21
5.1 Replacing the Fuse
21
22
22
5.2 Sensor Installation or Replacement
5.2.1 When to Replace a Sensor
Appendix...................................................................................... 25
A.1 Specifications
A.2 Spare Parts List
A.3 Drawing List
25
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: ZrO2 Sensor and Cell Block ........................................23
Figure 5-3 (A&B): Cell Removal/Installation ..................................23
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Model 3300ZB
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
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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Introduction
Model 3300ZB
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).
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 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 set-
points, 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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Introduction
Model 3300ZB
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
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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.
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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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Installation
Model 3300ZB
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.
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Installation
Model 3300ZB
The specific descriptions for each type of alarm are as follows:
HI Alarm
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.
LO Alarm
Sensor Fail
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. Pin-
outs are listed in Table 3-1.
Table 3-1: RS-232 Signals
RS-232 Sig
RD
RS-232 Pin
Purpose
Received Data
Transmitted Data
Common
2
3
5
TD
COM
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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
Baud 2400
Byte
Parity
8 bits
none
Stop Bits
1
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 O2 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.
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Installation
Model 3300ZB
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
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Operation
Model 3300ZB
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 full-
scale 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:
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Operation
Model 3300ZB
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 auto-
ranging 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 O2
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)
c)
Improperly analyzed or entered calibration gas value
Electronics failure
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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Operation
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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.
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Maintenance
Model 3300ZB
To open the spare fuse compartment, push on one end until it
slides out.
4. Remove the bad fuse and replace it with a 520 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 ZrO2 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.
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Trace Oxygen Analyzer
Maintenance
Figure 5-2: ZrO2 Sensor and Cell Block
Figure 5-3 (A&B): Cell Removal/Installation
(Rack mounting model shown)
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Maintenance
Model 3300ZB
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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
Signal Output: Voltage: 0–10 VDC, negative ground
Current: 4-20 mA, negative ground
Range ID: 0-10 VDC
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).
Response Time: 90% in less than 20 seconds at 25°C
System Power: AC (100-240 VAC, 47/440 Hz)
System Enclosure: Wall-mounting NEMA-4
Dimensions (Approx.) 8” W x 10” H x 6” D
Sensor Type: Zirconium Oxide
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Appendix
Model 3300ZB
A.2 Spare Parts List
1
1
1
2
C-64586A
C-76491C
C-76490C
F-1130
PC Board, Power Supply
PCB Board, Main
Interface Unit
Fuse (AC), ½A, 250 VAC
IEC Type T, 5x20mm
1
S-1439
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
or your local representative.
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Trace Oxygen Analyzer
Appendix
A.3 Drawing List
D80672
A69265
Outline Diagram
Piping Diagram
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