Teledyne 3000MB User Manual

Percent Oxygen Analyzer

OPERATING INSTRUCTIONS FOR

Model 3000MB

Percent 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-

SIST 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

03/31/01

ECO:#

i

Model 3000MB

Copyright © 2000 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 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
acknowledgments 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 Teledyne 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 Teledyne 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 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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Teledyne Analytical Instruments

Percent Oxygen Analyzer

Specific Model Information

The instrument for which this manual was supplied may incorporate one or
more options not included with 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 _______________________

includes the following options:

❑❑

❑ 3000MB-C: In addition to all standard features, this model also has

❑❑

separate ports for zero and span gases, and built-in
control valves. The internal valves are entirely under the
control of the 3000MB electronics, to automatically
switch between gases in synchronization with the
analyzer’s operations

❑❑

❑ 3000MB-M: In models with this option, the 4-20 mA Analog Current

❑❑

output is active. (In the standard units, it is not active.)

Teledyne Analytical Instruments

iii

Model 3000MB

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 Front Panel (Operator Interface) ..................................... 1-3

1.6 Interface Panel ............................................................... 1-5

2 Operational Theory

2.1 Introduction .................................................................... 2-1

2.2 Precise Paramagnetic Sensor........................................ 2-1

2.2.1 Principles of Operation ............................................ 2-1

2.3 Cross Interface............................................................... 2-3

2.4 Sample System.............................................................. 2-5

2.5 Electronics and Signal Processing ................................ 2-6

Table of Contents

3 Installation

3.1 Unpacking the Analyzer................................................. 3-1

3.2 Mounting the Analyzer ................................................... 3-1

3.3 Rear Panel Connections................................................ 3-2

3.3.1 Primary Input Power............................................... 3-4

3.3.2 Fuse Installation..................................................... 3-4

3.3.3 Anolog Outputs ...................................................... 3-4

3.3.4 Alarm Relays................................................................. 3-6

3.3.5 Digital Remote Cal Input............................................. 3-7

3.3.6 Range ID Relays.......................................................... 3-9

3.3.7 Network I/O.................................................................... 3-9

3.3.8 R/S-232 Port................................................................. 3-9

3.3.9 Remote Sensor and Solenoid Valves....................... 3-10

3.4 Gas Connection .............................................................3-12

3.5 Test The System.....................................................................3-14

4 Operation

4.1 Introduction .................................................................... 4-1

4.2 Using the Data Entry and Function Buttons ................... 4-2

4.3 The System Function ..................................................... 4-3

4.3.1 Setting the Display................................................. 4-4

4.3.2 Setting up an Auto-Cal........................................... 4-5

4.3.3 Password Protection .............................................. 4-5

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Teledyne Analytical Instruments

Percent Oxygen Analyzer

4.3.3.1 Entering the Password................................... 4-6

4.3.3.2 Installing or Changing the Password ............. 4-7

4.3.4 Logout.................................................................... 4-8

4.3.5 System Self-Diagnostic Test .................................. 4-9

4.3.6 Version Screen ...................................................... 4-9

4.4 The Span Functions...................................................... 4-10

4.4.1 Span Cal................................................................ 4-10

4.4.1.1 Auto Mode Spanning ..................................... 4-10

4.4.1.2 Manual Mode Spanning................................. 4-11

4.5 The Alarms Function...................................................... 4-12

4.6 The Range Function ...................................................... 4-14

4.6.1 Setting the Analog Output Ranges......................... 4-15

4.6.2 Autoranging Analysis ............................................. 4-15

4.6.3 Fixed Range Analysis ............................................ 4-15

4.7 The Analyze Function .................................................... 4-16

4.8 Signal Output ................................................................. 4-16

Maintenance

5.1 Fuse Replacement ......................................................... 5-1

5.2 System Self Diagnostic Test........................................... 5-2

5.3 Major Internal Components............................................ 5-2

5.4 Cleaning ........................................................................ 5-3

5.5 Troubleshooting ............................................................. 5-3

Appendix

A-1 Model 3000MB Specifications ....................................... A-1

A-2 Recommended 2-Year Spare Parts List......................... A-2

A-3 Drawing List................................................................... A-3

Teledyne Analytical Instruments

v

Model 3000MB

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

vi

Teledyne Analytical Instruments

Percent Oxygen Analyzer Introduction 1

Introduction

1.1 Overview

The Teledyne Analytical Instruments Model 3000MB Percent Oxygen Analyzer
is a versatile microprocessor-based instrument for detecting the percentage of
oxygen in a variety of background gases. This manual covers the Model
3000MB General Purpose flush-panel and/or rack-mount units only. These
units are for indoor use in a nonhazardous environment.

1.2 Typical Applications

A few typical applications of the Model 3000MB are:

• Monitoring inert gas blanketing

• Air separation and liquefaction

• Chemical reaction monitoring

• Semiconductor manufacturing

• Petrochemical process control

• Quality assurance

• Gas analysis certification.

1.3 Main Features of the Analyzer

The Model 3000MB Percent Oxygen Analyzer is sophisticated yet
simple to use. The main features of the analyzer include:

• A 2-line alphanumeric display screen, driven by microprocessor
electronics, that continuously prompts and informs the operator.

• High resolution, accurate readings of oxygen content from low
percent levels through 100 %. Large, bright, meter readout.

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1-1

1 Introduction Model 3000MB

• Advanced Paramagnetic sensor, designed for percent oxygen
analysis. Several options are available.

• 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 0-1% through 0-100 %)
allow best match to users process and equipment.

• Air-calibration range for convenient spanning at 20.9 %.

• Auto Ranging allows analyzer to automatically select the proper
preset range for a given measurement. Manual override allows
the user to lock onto a specific range of interest.

• Two adjustable concentration alarms and a system failure alarm.

• Extensive self-diagnostic testing, at startup and on demand, with
continuous power-supply monitoring.

• Two way RFI protection.

• RS-232 serial digital port for use with a computer or other digital
communication device.

• Analog outputs for percent-of-range and for range identification.
0–1 V dc. (Isolated 4–20 mA dc optional)

• Convenient and versatile, steel, flush-panel or rack-mountable
case with slide-out electronics drawer.

1.4 Model Designations

3000MB: Standard model.
3000MB-C: In addition to all standard features, this model also has

separate ports for zero and span gases, and built-in control
valves. The internal valves are entirely under the control of
the 3000MA electronics, to automatically switch between
gases in synchronization with the analyzer’s operations.

3000MB-M: This model has current output signals (4-20 mA) for percent-

of-range and range ID, in addition to voltage outputs.

1-2

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Percent Oxygen Analyzer Introduction 1

OUTER DOOR

(OPEN)

VIEWING
WINDOW

OUTER DOOR

LATCH

GAS CONNECTION

(LOCATED BEHIND GAS PANEL)

DIGITAL

METER

INNER DOOR

LATCH

CONTROL

PANEL

FLOWMETER

GAS CONNECTOR

PANEL

Figure 1-1: Model 3000MB Front Panel

1.5 Front Panel (Operator Interface)

The standard 3000MB is housed in a rugged metal case with all con­trols and displays accessible from the front panel. See Figure 1-1. The front
panel has thirteen buttons for operating the analyzer, a digital meter, an
alphanumeric display, and a window for viewing the sample flowmeter.

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1 Introduction Model 3000MB

Function Keys: Six touch-sensitive membrane switches are used to

change the specific function performed by the analyzer:

• Analyze Perform analysis for oxygen content of a sample gas.

• System Perform system-related tasks (described in detail in

chapter 4, Operation.).

• Span Span calibrate the analyzer.

• Zero Zero calibrate the analyzer.

• Alarms Set the alarm setpoints and attributes.

• Range Set up the 3 user definable ranges for the instrument.

Data Entry Keys: Six touch-sensitive membrane switches are used to

input data to the instrument via the alphanumeric VFD display:

• Left & Right Arrows Select between functions currently

displayed on theVFD screen.

• Up & Down Arrows Increment or decrement values of

functions currently displayed.

• Enter Moves VFD display on to the next screen in a series. If

none remains, returns to the Analyze screen.

• Escape Moves VFD display back to the previous screen in a

series. If none remains, returns to the Analyze screen.

Digital Meter Display: The meter display is a LED device that

produces large, bright, 7-segment numbers that are legible in any lighting
environment. It produces a continuous readout from 0-100 %. It is accurate
across all ranges without the discontinuity of analog range switching.

Alphanumeric Interface Screen: The VFD screen is an easy-to-use

interface from operator to analyzer. It displays values, options, and messages
that give the operator immediate feedback.

Flowmeter: Monitors the flow of gas past the sensor. Readout is 0 to

1000 standard cubic centimeters per minute (SCCM).

Standby Button: The Standby turns off the display and outputs,

but circuitry is still operating.

CAUTION: The power cable must be unplugged to fully

disconnect power from the instrument. When
chassis is exposed or when access door is open
and power cable is connected, use extra care to
avoid contact with live electrical circuits.

1-4

Teledyne Analytical Instruments

Percent Oxygen Analyzer Introduction 1

Access Door: To provide access to the sensor, the front panel swings
open when the latch in the upper right corner of the panel is pressed all the
way in with a narrow gauge tool. Accessing the main circuit board requires
unfastening the rear panel screws and sliding the unit out of the case.

1.6 Interface Panel (Equipment Interface)

The rear panel, shown in Figure 1-2, contains the gas and electrical
connectors for external inlets and outlets. The Zero and Span gas connectors,
and the Current signal outputs are optional and may not appear on your
instrument. The connectors are described briefly here and in detail in the
Installation chapter of this manual.

Figure 1-2: Model 3000MB Rear Panel

• Power Connection Universal AC power source.

• Analog Outputs 0-1 V dc concentration output, plus

0-1 V dc range ID.

• Alarm Connections 2 concentration alarms and 1 system

alarm.

• RS-232 Port Serial digital concentration signal output

and control input.

• Remote Probe Used in the 3000MB for controlling

external solenoid valves only.

• 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 For future expansion. Not implemented

at this printing.

Teledyne Analytical Instruments

1-5

1 Introduction Model 3000MB

1-6

Teledyne Analytical Instruments

Percent Oxygen Analyzer Operational Theory 2

Operational Theory

2.1 Introduction

The analyzer is composed of three subsystems:

1. Paramagnetic 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 Paramagnetic Sensor is an electromechanical device that
translates the amount of oxygen present in the sample into an electrical
signal. The electronic signal processing, display and control subsystem
simplifies operation of the analyzer and accurately processes the sampled
data. The microprocessor controls all signal processing, input/output and
display functions for the analyzer.

2.2 Precise Paramagnetic Sensor

2.2.1 Principles of Operation

The heart of the 3000MB is a paramagnetic type oxygen sensor that is
maintanance free and has a long lifetime. Oxygen has a very high magnetic
sucseptibility compared to other gases and thus displays a particularly para­magnetic behavior. A small glass dumbbell filled with nitrogen and rotating
on a taut platinum wire is suspended in an inhomogneous magnetic field.
This glass dumbbell is diamagnetic and tends to rotate out of the magnetic
field. The strength of the resulting torque determined by an susceptibility of
the sample gas. This torque is compensated for by a counter torque induced
by an electrically charged platinum coil on the dumbbell. The zero position
of the dumbbell is controlled by means of an optical system consisting of a
light source, a mirror at the dumbbell axis and a pair of detectors. The
difference between the compensating currents required to bring the dumb-

Teledyne Analytical Instruments

2-1

2 Operational Theory Model 3000MB

bell to the zero position in the presence of zero gas (i.e. no O2 present) or of
sample gas is proportional to the partial pressure of oxygen in the sample
gas.

The sensor enclosure is temperature controlled to 55 degrees centigrade
to insure that the magnetic susceptibility of oxygen in the sample is not
affected by the ambient temperature. The measuring cell has a measuring
volume of approximately 3 cm

3

Sensor

(side view shown)

The Paramagnetic sensor enclosure holds not only the sensing elements,
but the temperature controller electronics, heating elements, sensor electron­ics, and preamplifier. The Electronics and heating elements require a separate
power source, from the rest of the 3000MB capable of delivering 1.5 amps
approximately at 24 volts dc. The output of the sensor is roughly calibrated
to be 0 to 1 volt DC for the the range of 0 to 100 % 02. The true calibration
of the sensor is carried out by the microprocessor as described later in chap­ter 4. The electrical interconnections to the sensor are done through a 15 pin
D connector. Some signals from the sensor are not connected. They are only
useful for troubleshooting, by trained personnel, as test points.

2-2

Teledyne Analytical Instruments

Percent Oxygen Analyzer Operational Theory 2

Sensor

(rear view shown)

Pin out:

1 -15Vdc test pin (Not connected)
2 +15Vdc test pin (Not connected)
3 Measuring ground
4 Not used
5 Preamplifier output ~0- 1 Vdc
6 Not used
7 24 Vdc return, power ground
8 Collector of transistor switching heating element (Not con-

nected)
9 Fault signal: <0 Vdc= OK, >4.6 Vdc = Fault (Not connected)
10 Not used
11 Negative reference voltage (Not connected)
12 Positive reference voltage (Not connected)
13 Nominal temperature voltage signal (Not connected)
14 Actual temperature voltage signal (Not connected)
15 +24 Vdc power.

2. 3 Cross Interference

As mentioned previously, the selectivity of the measuring system is

based on the extraordinarily high magnetic susceptibility of Oxygen com­pared to other gases. In most cases the presence of other gases can be ig­nored but significant errors can occur when the sensor is calibrated with a
mixture of oxygen and nitrogen and the sample gas consists mainly of other
gases with considerable magnetic susceptibility. In this case, the reading
shows a measured value even if the sample gas contains no Oxygen. It is
actually displaying the cross sensitivity to another gas.

The following table shows the cross sensitivity of some gases when

changing from pure nitrogen to 100% of one of the gases listed.

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2-3

2 Operational Theory Model 3000MB

Gas Cross Gas Cross

Sensitivity Sensitivity
in vol. % in vol. %

Acetylene C
Allene C3H

4

Ammonia NH

2H2

3

-0.24 Hydrogen chloride HCI -0.30

-0.44 Hydrogen fluoride HF +0.10

-0.26 Hydrogen iodide HI -1.10
Argon Ar -0.22 Hydrogen sulphide H2S -0.39
Bromine Br

2

1.2 Butadiene C4H

1.3 Butadiene C4H
n-Butane C4H

10

6
6

-1.30 Iodine I -2.40

-0.49 Isobutane C4H

-0.49 Isopantane C5H

10

12

-1.11

-1.11 Krypton Kr -0.51
I-Butane C4H8 -085 Laughing gas N2O -0.20
cis 2-Butane C4H
trans 2-Butane C
Carbon dioxide CO

8

4H8

2

Carbon monoxide CO +0.06 Nitric acid HNO
Chlorine Cl
Cyclo hexane C6H
Ethane C2H
Ethylene C2H

2

12

6

4

Helium He +0.30 Propane C3H
n-Heptane C7H
n-Hexane C6H
Hydrogen H

16

14

2

-0.89 Methane CH

4

-0.20

-0.92 Neon Ne +0.13

-0.27 Neopentane C5H

12

3

-0.77 Nitrogen dioxide NO

2

-1.49
+0.43
+28.00

-1.56 Nitrous oxide NO +40.00

-0.43 n-Octane C8H

-0.26 n-Pentane C5H

8

-2.10 Propylene C3H

18

12

6

-2.50

-1.45

-0.86

-0.55

-1.70 Vinyl chloride -0.63

+0.24 Water H2O -0.02

Hydrogen bromide HBr -.0.61 Xenon Xe -0.95

-1.49

With gas mixtures the components are weighted according to their

proporational volumes.

The cross interference with a gas mixture can be determined in advance if the

concentration of the individual background gases is known.

Example:

Cross sensitivity calculation for a gas mixture:

The gas to be measured consists of 10 % CO2, 40 % of N2, and 50%

of Ar.

C02: -0.27 x 10% = -0.027
Ar: -0.22x5O%= -0.11

TOTAL CROSS INTERFERENCE -0.137

Calculation of the zero value:

2-4

Teledyne Analytical Instruments

Percent Oxygen Analyzer Operational Theory 2

(0% 02) - (Cross Interference Value) = Zero Point Value

0%-(-0.137) = +0.137%0

2

2.4 Sample System

The sample system delivers gases to the sensor from the analyzer gas
panel inlets. Depending on the mode of operation either sample or calibration
gas is delivered.

The Model 3000MB 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 encounters almost no dead space. This minimizes
residual gas pockets that can interfere with low percent range analysis.

The sample system for the standard instrument incorporates ¼ inch tube
fittings for sample inlet and outlet connections at the rear panel. For metric
system installations, 6 mm adapters are available with each instrument to be
used if needed. The sample or calibration gas flowing through the system is
monitored by a flowmeter downstream from the sensor.

The gases delivered to the instrument should be at constant pressures and
flow rates and must exit freely into the ambient atmosphere. The Span, Zero
and Sample gases should be delivered at constant pressures of about 10 psig
(Range 5-20). The flow rate must be maintained at about 700 cc/minute (Range
500-900) and must exit freely into atmospheric pressure.

Span In

Zero In

Sample In

In v a cu u m s e rvic e th e
restrictor s h ou ld b e
placed here.

Exhaust Out

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 por­tions of the diagram show the components added when the –C options are
ordered. The solenoid valves, when supplied, are installed inside the 3000MB
enclosure and are regulated by the instruments internal electronics.

Components in the shaded area are in
the -C option (internal control valves)
only and are not shown in the piping
diagram above.

Cell

S olen oid
Valves

Flow meter

Restrictor

In normal service the
restrictor s h ou ld b e
placed here.

Figure 2-4: Flow Diagram

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2 Operational Theory Model 3000MB

2.5 Electronics and Signal Processing

The Model 3000MB Percent Oxygen Analyzer uses an 8031 microcon­troller with 32 kB of RAM and 128 kB of 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 any international power source. Figure 2-6 shows the location of the
power supply and the main electronic PC boards.

The signal processing electronics including the microprocessor, analog
to digital, and digital to analog converters are located on the motherboard at
the bottom of the case. The preamplifier board is mounted on top of the
motherboard as shown in the figure. These boards are accessible after re­moving the back panel. Figure 2-7 is a block diagram of the Analyzer
electronics.

2-6

Teledyne Analytical Instruments

Percent Oxygen Analyzer Operational Theory 2

Sensor Amplifier

Sensor

24V P ower

Supply

Auto

Range

Self Test
Signal

Power

Supply

System

Failure

Alarm

Displays

A to D

Converter

Micro-

Processor

0-1 V

Concentration

D to A

Converter

Range

0-1 V

Figure 2-6: Block Diagram of the Model 3000MB Electronics

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2 Operational Theory Model 3000MB

2-8

Teledyne Analytical Instruments

Percent Oxygen Analyzer Installation 3

Installation

Installation of the Model 3000PB Analyzer includes:

1. Unpacking

2. Mounting

3. Gas connections

4. Electrical connections

5. Installing the Micro-Fuel Cell

6. Testing the system.

3.1 Unpacking the Analyzer

The analyzer is shipped with all the materials you need to install and
prepare the system for operation. Carefully unpack the analyzer and inspect
it for damage. Immediately report any damage to the shipping agent.

3.2 Mounting the Analyzer

The Model 3000PB is designed for bulkhead mounting in nonhazard­ous environments. There are four mounting lugs—one in each corner of the
enclosure. The outline drawing, at the back of this manual, gives the mount­ing hole size and spacing. The drawing also contains the overall dimensions.
Do not forget to allow an extra 13/8" for the hinges.

Be sure to allow enough space in front of the enclosure to swing the
outer door open—a 11 3/4" radius, as shown in Figure 3-2.

All electrical connections are made via cables which enter the NEMA-4
housing through ports in its side. No conduit fittings are supplied. The
installer must provide two 3/4" NPT and two 1" NPT adapters and the
appropriate sealing conduit.

For gas connections, the unit is supplied with 1/4" tube fittings, and 6
millimeter adapters are supplied for metric system installations.

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3-1

3 Installation Model 3000MB

3-2

Figure 3-1: Front View of the Model 3000MB (Simplified)

Teledyne Analytical Instruments

Percent Oxygen Analyzer Installation 3

Figure 3-2: Required Front Door Clearance

3.3 Electrical Connections

Figure 3-3 shows the Model 3000MB Electrical Connector Panel.
There are terminal blocks for connecting power, communications, and both
digital and analog concentration outputs.

Figure 3-3: Electrical Connector Panel

Teledyne Analytical Instruments

3-3

3 Installation Model 3000MB

For safe connections, ensure that no uninsulated wire extends outside of
the connectors they are attached to. Stripped wire ends must insert com­pletely into terminal blocks. No uninsulated wiring should be able to come in
contact with fingers, tools or clothing during normal operation. Terminal
block can accept ware guage 20 to 10.

3.3.1 Primary Input Power

The universal power supply requires a 115 or 230 V ac, 50 or 60 Hz,
power source. The actual input voltage used must show in the window of the
VOLTAGE SELECTOR switch before the power source is connected. See
Figure 3-4 for detailed connections.

DANGER: Power is applied to the instrument's circuitry as

long as the instrument is connected to the power
source. The Standby function switches power on or
off to the displays and outputs only.

Figure 3-4: Primary Input Power Connections

3.3.2 Fuse Installation

The fuse holders accept 5 x 20 mm, 4.0 A, T type (slow blow) fuses.
Fuses are not installed at the factory. Be sure to install the proper fuse as part
of installation. (See Fuse Replacement in chapter 5, maintenance.)

3.3.3 Analog Outputs

There are eight DC output signal connectors on the ANALOG OUT­PUTS connector block. There are two connectors per output with the polar­ity noted. See Figure 3-5.

3-4

Teledyne Analytical Instruments

Percent Oxygen Analyzer Installation 3

Figure 3-5: Analog Output Connections

The outputs are:

0–1 V dc % of Range: Voltage rises linearly with increasing oxygen, from

0 V at 0 % to 1 V at 100 %. (Full scale = 100% of
programmable range.)

0–1 V dc Range ID: 0.25 V = Low Range, 0.5 V = Medium Range,

0.75 V = High Range, 1 V = Air Cal Range.

4–20 mA dc % Range: (-M Option) Current increases linearly with increas-

ing oxygen, from 4 mA at 0 % to 20 mA at full
scale 100 %. (Full scale = 100% of programmable
range.)

4–20 mA dc Range ID: (-M Option) 8 mA = Low Range, 12 mA = Me-

dium Range, 16 mA = High Range, 20 mA = Air
Cal Range.

Examples:

The analog output signal has a voltage which depends on the oxygen
concentration AND the currently activated analysis range. To relate the
signal output to the actual concentration, it is necessary to know what range
the instrument is currently on, especially when the analyzer is in the
autoranging mode.

The signal output for concentration is linear over the currently selected
analysis range. For example, if the analyzer is set on a range that was defined
as 0–10 % O2, then the output would be as shown in Table 3-1.

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Table 3-1: Analog Concentration Output—Example

Voltage Signal Current Signal

% O

2

Output (V dc) Output (mA dc)

0 0.0 4.0
1 0.1 5.6
2 0.2 7.2
3 0.3 8.8
4 0.4 10.4
5 0.5 12.0
6 0.6 13.6
7 0.7 15.2
8 0.8 16.8
9 0.9 18.4

10 1.0 20.0

To provide an indication of the range, a second pair of analog output
terminals are used. They generate a steady preset voltage (or current when
using the current outputs) to represent a particular range. Table 3-2 gives the
range ID output for each analysis range.

Table 3-2: Analog Range ID Output—Example

Range Voltage (V) Current (mA)

LO 0.25 8
MED 0.50 12
HI 0.75 16
CAL (0-25%) 1.00 20

3.3.4 Alarm Relays

There are three alarm-circuit connectors on the alarm relays block
(under RELAY OUTPUTS) for making connections to internal alarm relay
contacts. Each provides a set of Form C contacts for each type of alarm.
Each has both normally open and normally closed contact connections. The
contact connections are indicated by diagrams on the rear panel. They are
capable of switching up to 3 amperes at 250 V ac into a resistive load. See
Figure 3-6.

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Percent Oxygen Analyzer Installation 3

Figure 3-6: Types of Relay Contacts

The connectors are:

Threshold Alarm 1: • Can be configured as high (actuates when concen-

tration is above threshold), or low (actuates when
concentration is below threshold).

• Can be configured as failsafe or nonfailsafe.

• Can be configured as latching or nonlatching.

• Can be configured out (defeated).

Threshold Alarm 2: • Can be configured as high (actuates when concen-

tration is above threshold), or low (actuates when
concentration is below threshold).

• Can be configured as failsafe or nonfailsafe.

• Can be configured as latching or nonlatching.

• Can be configured out (defeated).

System Alarm: Actuates when DC power supplied to circuits is

unacceptable in one or more parameters. Permanently
configured as failsafe and latching. Cannot be de­feated. Actuates if self test fails.

To reset a System Alarm during installation, discon­nect power to the instrument and then reconnect it.

Further detail can be found in chapter 4, section 4-5.

3.3.5 Digital Remote Cal Inputs

Remote Zero and Span Inputs: The REMOTE SPAN and RE-

MOTE ZERO inputs are on the DIGITAL INPUT terminal block. They
accept 0 V (OFF) or 24 V dc (ON) for remote control of calibration. (See
Remote Calibration Protocol below.)

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ZERO: Floating input. 5 to 24 V input across the + and – terminals

puts the analyzer into the Zero mode. Either side may be
grounded at the source of the signal. 0 to 1 volt across the
terminals allows Zero mode to terminate when done. A
synchronous signal must open and close the external zero
valve appropriately. See 3.3.9 Remote Sensor and Solenoid
Valves. (With the –C option, the internal valves automatically
operate synchronously.)

SPAN: Floating input. 5 to 24 V input across the + and – terminals

puts the analyzer into the Span mode. Either side may be
grounded at the source of the signal. 0 to 1 volt across the
terminals allows Span mode to terminate when done. A
synchronous signal must open and close the external span
valve appropriately. See 3.3.9 Remote Sensor and Solenoid
Valves. (With the –C option, the internal valves automatically
operate synchronously.)

Cal Contact: This relay contact is closed while analyzer is spanning

and/or zeroing. (See Remote Calibration Protocol below.)

Remote Calibration Protocol: To properly time the Digital Remote

Cal Inputs to the Model 3000MB Analyzer, the customer's controller must
monitor the CAL CONTACT relay.

When the contact is OPEN, the analyzer is analyzing, the Remote Cal

Inputs are being polled, and a zero or span command can be sent.

When the contact is CLOSED, the analyzer is already calibrating. It

will ignore your request to calibrate, and it will not remember that request.

Once a zero or span command is sent, and acknowledged (contact
closes), release it. If the command is continued until after the zero or span is
complete, the calibration will repeat and the Cal Relay Contact (CRC) will
close again.

For example:

1) Test the CRC. When the CRC is open, Send a zero command
until the CRC closes (The CRC will quickly close.)

2) When the CRC closes, remove the zero command.

3) When CRC opens again, send a span command until the CRC
closes. (The CRC will quickly close.)

4) When the CRC closes, remove the span command.

When CRC opens again, zero and span are done, and the sample is

being analyzed.

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Note: The remote probe connections (paragraph 3.3.9) provides

signals to ensure that the zero and span gas valves will be
controlled synchronously. If you have the –C Internal valve
option—which includes additional zero and span gas inputs—
the 3000MB automatically regulates the zero, span and sample
gas flow.

3.3.6 Range ID Relays

There are four dedicated RANGE ID CONTACT relays. The first
three ranges are assigned to relays in ascending order—Low range is as­signed to RANGE 1 ID, Medium range is assigned to RANGE 2 ID, and
High range is assigned to RANGE 3 ID. RANGE 4 ID is reserved for the
Air Cal Range (25%).

3.3.7 Network I/O

A serial digital input/output for local network protocol. At this printing,
this port is not yet functional. It is to be used in future versions of the instru­ment.

3.3.8 RS-232 Port

The digital signal output is a standard RS-232 serial communications
port used to connect the analyzer to a computer, terminal, or other digital
device. The pinouts are listed in Table 3-3.

Table 3-3: RS-232 Signals

RS-232 Sig RS-232 Pin Purpose

DCD 1 Data Carrier Detect

RD 2 Received Data

TD 3 Transmitted Data

DTR 4 Data Terminal Ready

COM 5 Common

DSR 6 Data Set Ready

RTS 7 Request to Send
CTS 8 Clear to Send

RI 9 Ring Indicator

The data sent is status information, in digital form, updated every two
seconds. Status is reported in the following order:

• The concentration in percent

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• The range in use (HI, MED, LO)

• The span of the range (0-100 %, etc)

• Which alarms—if any—are disabled (AL–x DISABLED)

• Which alarms—if any—are tripped (AL–x ON).

Each status output is followed by a carriage return and line feed.

Three input functions using RS-232 have been implemented to date.

They are described in Table 3-4.

Table 3-4: Commands via RS-232 Input

Command Description
as<enter> Immediately starts an autospan.
az<enter> Immediately starts an autozero.
co<enter> Reports “Raw Cell Output” (current output of the sensor

itself) in µA. For example—

Raw Cell Output: 99

µµ

µA

µµ

st<enter> Toggling input. Stops/Starts any status message output from

the RS-232, until st<enter> is sent again.

The RS-232 protocol allows some flexibility in its implementation.
Table 3-5 lists certain RS-232 values that are required by the 3000MB
implementation.

Table 3-5: Required RS-232 Options

Parameter Setting

Baud 2400

Byte 8 bits

Parity none

Stop Bits 1

Message Interval 2 seconds

3.3.9 Remote Sensor and Solenoid Valves

The 3000PB is a single-chassis instrument, which has its own sensor
and, in the –C option, its own gas-control solenoid valves. However, The
REMOTE SENSOR and SOLENOID RETURN connectors are provided
for use with a remote sensor and/or sampling system, if desired. See Figures
3-7 and 3-8.

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Percent Oxygen Analyzer Installation 3

Figure 3-7: Remote Sensor Connector Pinouts

Figure 3-8: Remote Solenoid Return Connector Pinouts

The voltage from these outputs is nominally 0 V for the OFF and
15 V dc for the ON conditions. The maximum combined current that can be
pulled from these output lines is 100 mA. (If two lines are ON at the same
time, each must be limited to 50 mA, etc.) If more current and/or a different
voltage is required, use a relay, power amplifier, or other matching circuitry
to provide the actual driving current.

In addition, each individual line has a series FET with a nominal ON
resistance of 5 ohms (9 ohms worst case). This could limit the obtainable
voltage, depending on the load impedance applied. See Figure 3-9.

Figure 3-9: FET Series Resistance

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3.4 Gas Connections

Before using this instrument, it should be determined if the unit will be
used for pressurized service or vacuum service and low pressure applica­tions. Inspect the restrictor kit that came with the unit. The kit consist of two
restrictors and a union for 1/4” diameter tubing. Notice that the two 1 3/4”
long, 1/4” diameter tubing are restrictors. It has an open end and a closed
end with a small circular orifice. The restrictor without the blue sticker is for
low pressure and vacuum service. For high pressure (5 to 50 psig) applica­tions, use the restrictor that has a blue sticker on the body.

For pressurized service, use the restrictor without the blue dot and union
from the restrictor kit and attach it to the Sample In port. The small circular
orifice should face away from the back of the unit (against the direction of
gas flow). Use the restrictor without the blue dot sticker in the same manner
for low pressure applications (less than 5 psig).

For vacuum service (5-10 in Hg), use the restrictor without the blue dot
sticker and union but attach it to the Exhaust Out port. The small circular
orifice should face toward the back of the unit (against the direction of gas
flow).

Remove the blue sticker from the restrictor before using.

WARNING: Operating the unit without restrictors can cause damage to t

the micro-fuel cell.

Figure 3-10 is an illustration of the Gas Connector Panel. Optional gas
connections are shown in shaded blocks.

The unit is manufactured with 1/4 inch tube fittings, and 6 mm adapters
are supplied for metric system installations.

For a safe connection:

1. Insert the tube into the tube fitting, and finger-tighten the nut until
the tubing cannot be rotated freely, by hand, in the fitting. (This
may require an additional 1/8 turn beyond finger-tight.)

2. Hold the fitting body steady with a backup wrench, and with
another wrench rotate the nut another 11/4 turns.

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Percent Oxygen Analyzer Installation 3

Behind Panel

Figure 3-10: Gas Connector Panel

SAMPLE IN: In the standard model, gas connections are made at the

SAMPLE IN and EXHAUST OUT connections. Calibration gases must be

Tee'd into the Sample inlet with appropriate valves.

The gas pressure in should be reasonably regulated. Pressures between
3 and 40 psig are acceptable as long as the pressure, once established, will
keep the front panel flowmeter reading in an acceptable range (0.1 to 2.4
SLPM). Exact figures will depend on your process.

If greater flow is required for improved response time, install a bypass
in the sampling system upstream of the analyzer input.

Note: If you have the –V option, The above numbers apply instead to

the vacuum at the EXHAUST OUT connector, described be­low, with minus signs before the pressure readings.

ZERO IN and SPAN IN: These are additional ports, included on
models with the -C option, for inputting span gas and zero gas. There are
electrically operated valves inside for automatic switching between sample
and calibration gases. These valves are completely under control of the
3000PB Electronics. They can be externally controlled only indirectly
through the Remote Cal Inputs, described below.

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Pressure, flow, and safety considerations are the same as prescribed for

the SAMPLE IN inlet, above.

EXHAUST OUT: Exhaust connections must be consistent with the

hazard level of the constituent gases. Check Local, State, and Federal laws,
and ensure that the exhaust stream vents to an appropriately controlled area if
required.

Note: If your 3000MB has the –V option, see Sample In, above, for

gas pressure/flow considerations.

3.5 Testing the System

Before plugging the instrument into the power source:

• Check the integrity and accuracy of the gas connections. Make
sure there are no leaks.

• Check the integrity and accuracy of the electrical connections.
Make sure there are no exposed conductors

• Check that sample pressure is between 3 and 40 psig, according
to the requirements of your process.

• Check that the voltage selector switch on the Electrical
Connector Panel is in the appropriate position for your power
source.

Power up the system, and test it by performing the following

operations:

1. Repeat the Self-Diagnostic Test as described in chapter 4, section

4.3.5.

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Operation

4.1 Introduction

Once the analyzer has been installed, it can be configured for your

application. To do this you will:

• Set system parameters:

• Establish a security password, if desired, requiring Operator
to log in.

• Establish and start an automatic calibration cycle, if desired.

• Calibrate the instrument.

• Define the three user selectable analysis ranges. Then choose
autoranging or select a fixed range of analysis, as required.

• Set alarm setpoints, and modes of alarm operation (latching,
failsafe, etc).

Before you configure your 3000MB these default values are in effect:

Ranges: LO = 1 %, MED = 5 %, HI = 10 %
Auto Ranging: ON
Alarm Relays: Defeated, 10 %, HI, Not failsafe, Not latching
Zero: Auto, every 0 days at 0 hours
Span: Auto, at 20.9 %, every 0 days at 0 hours

If you choose not to use password protection, the default password is

automatically displayed on the password screen when you start up, and you
simply press Enter for access to all functions of the analyzer.

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4.2 Using the Data Entry and Function
Buttons

Data Entry Buttons: The < > arrow buttons select options from the

menu currently displayed on the VFD screen. The selected option blinks.

When the selected option includes a modifiable item, the

buttons can be used to increment or decrement that modifiable item.

The Enter button is used to accept any new entries on the VFD screen.
The Escape button is used to abort any new entries on the VFD screen that
are not yet accepted by use of the Enter button.

Figure 4-1 shows the hierarchy of functions available to the operator via
the function buttons. The six function buttons on the analyzer are:

• Analyze. This is the normal operating mode. The analyzer

monitors the oxygen content of the sample, displays the percent
of oxygen, and warns of any alarm conditions.

• System. The system function consists of six subfunctions that

regulate the internal operations of the analyzer:

• Set LCD screen contrast

• Setup Auto-Cal

• Assign Password

• Initiate Self -Test

• Check software version

• View sensor output

Contrast Function is DISABLED

(Refer to Section 1.6)

∆∆

∆∇ arrow

∆∆

• Log out.

• Zero. Used to set up a zero calibration.

• Span. Used to set up a span calibration.

• Alarms. Used to set the alarm setpoints and determine whether

each alarm will be active or defeated, HI or LO acting, latching,
and/or failsafe.

• Range. Used to set up three analysis ranges that can be switched

automatically with auto-ranging or used as individual fixed
ranges.

Any function can be selected at any time by pressing the appropriate
button (unless password restrictions apply). The order as presented in this
manual is appropriate for an initial setup.

Each of these functions is described in greater detail in the following
procedures. The VFD screen text that accompanies each operation is repro-

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Contrast Function is DISABLED

(Refer to Section 1.6)

Figure 4-1: Hierarchy of Functions and Subfunctions

duced, at the appropriate point in the procedure, in a Monospaced type
style. Pushbutton names are printed in Oblique type.

4.3 The System Function

The subfuctions of the System function are described below. Specific

procedures for their use follow the descriptions:

• Auto-Cal: Used to define an automatic calibration sequence

and/or start an Auto-Cal.

• PSWD: Security can be established by choosing a 5 digit

password (PSWD) from the standard ASCII character set. (See
Installing or Changing a Password, below, for a table of ASCII
characters available.) Once a unique password is assigned and
activated, the operator MUST enter the UNIQUE password to
gain access to set-up functions which alter the instrument's

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operation, such as setting the instrument span or zero setting,
adjusting the alarm setpoints, or defining analysis ranges.

After a password is assigned, the operator must log out to
activate it. Until then, anyone can continue to operate the
instrument without entering the new password.

Only one password can be defined. Before a unique password
is assigned, the system assigns TBEAI by default. This allows
access to anyone. After a unique password is assigned, to defeat
the security, the password must be changed back to TBEAI.

• Logout: Logging out prevents an unauthorized tampering with

analyzer settings.

• More: Select and enter More to get a new screen with additional

subfunctions listed.

• Self–Test: The instrument performs a self-diagnostic test to

check the integrity of the power supply, output boards and
amplifiers.

• Version: Displays Manufacturer, Model, and Software Version

of instrument.

4.3.1 Setting the Display

Contrast Function is DISABLED

(Refer to Section 1.6)

If you cannot read anything on the display after first powering up:

1. Observe LED readout.

a. If LED meter reads all eights and periods, go to step 3.
b. If LED meter displays anything else, go to step 2.

2. Press button twice to turn Analyzer OFF and ON again.
LED meter should now read all eights and periods. Go to step 3.

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Percent Oxygen Analyzer Operation 4

4.3.2 Setting up an Auto-Cal

When proper automatic valving is connected (see chapter 3, installa-

tion), the Analyzer can cycle itself through a sequence of steps that automati-

cally zero and span the instrument.

Note: If you require highly accurate Auto-Cal timing, use external

Auto-Cal control where possible. The internal clock in the
Model 3000MA is accurate to 2-3 %. Accordingly, internally
scheduled calibrations can vary 2-3 % per day.

To setup an Auto–Cal cycle:
Choose System from the Function buttons. The VFD will display five

subfunctions.

Contrast Function is DISABLED

(Refer to Section 1.6)

Use < > arrows to blink Auto—Cal, and press Enter. A new screen for

Span/Zero set appears.

Press < > arrows to blink Span (or Zero), then press Enter again. (You

won’t be able to set OFF to ON if a zero interval is entered.) A Span
Every ... (or Zero Every ...) screen appears.

∆∆

Use

∆∇ arrows to set an interval value, then use < > arrows to move to

∆∆

the start-time value. Use

To turn ON the Span and/or Zero cycles (to activate Auto-Cal): Press

System again, choose Auto—Cal, and press Enter again. When the Span/
Zero screen appears, use the < > arrows to blink the Span (or Zero) OFF
/ ON field. Use

∆∆

∆∇ arrows to set the OFF / ON field to ON. You can now

∆∆

turn these fields ON because there is a nonzero span interval defined.

Contrast Auto—Cal
PSWD Logout More

Span OFF Nxt: 0d 0h
Zero OFF Nxt: 0d 0h

Span Every 0 d
Start 0 h from now

∆∆

∆∇ arrows to set a start-time value.

∆∆

4.3.3 Password Protection

If a password is assigned, then setting the following system parameters

can be done only after the password is entered: span and zero settings,
alarm setpoints, analysis range definitions, switching between autoranging
and manual override, setting up an auto-cal, and assigning a new password.
However, the instrument can still be used for analysis or for initiating a self­test without entering the password.

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If you have decided not to employ password security, use the default

password TBEAI. This password will be displayed automatically by the
microprocessor. The operator just presses the Enter key to be allowed total
access to the instrument’s features.

NOTE: If you use password security, it is advisable to keep a copy of

the password in a separate, safe location.

4.3.3.1 Entering the Password

To install a new password or change a previously installed password,

you must key in and ENTER the old password first. If the default password
is in effect, pressing the ENTER button will enter the default TBEAI
password for you.

Press System to enter the System mode.

Contrast Auto—Cal
PSWD Logout More

Contrast Function is DISABLED

(Refer to Section 1.6)

Use the < > arrow keys to scroll the blinking over to PSWD, and press

Enter to select the password function. Either the default TBEAI password or
AAAAA place holders for an existing password will appear on screen

depending on whether or not a password has been previously installed.

T B E A I
Enter PWD

or

A A A A A
Enter PWD

The screen prompts you to enter the current password. If you are not

using password protection, press Enter to accept TBEAI as the default
password. If a password has been previously installed, enter the password
using the < > arrow keys to scroll back and forth between letters, and the

∆∆

∆∇

∆∆

arrow keys to change the letters to the proper password. Press Enter to enter
the password.

If the password is accepted, the screen will indicate that the password

restrictions have been removed and you have clearance to proceed.

In a few seconds, you will be given the opportunity to change this

password or keep it and go on.

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Removed

Percent Oxygen Analyzer Operation 4

Change Password?
<ENT>=Yes <ESC>=No

Press Escape to move on, or proceed as in Changing the Password,

below.

4.3.3.2 Installing or Changing the Password

If you want to install a password, or change an existing password,
proceed as above in Entering the Password. When you are given the oppor­tunity to change the password:

Change Password?
<ENT>=Yes <ESC>=No

Press Enter to change the password (either the default TBEAI or the
previously assigned password), or press Escape to keep the existing pass­word and move on.

If you chose Enter to change the password, the password assignment
screen appears.

T B E A I
<ENT> To Proceed

or

A A A A A
<ENT> To Proceed

Enter the password using the < > arrow keys to move back and forth
between the existing password letters, and the

∆∆

∆∇ arrow keys to change the

∆∆

letters to the new password. The full set of 94 characters available for pass­word use are shown in the table below.

Characters Available for Password Definition:

ABCDEFGHIJ
KLMNOPQRST
UVWXYZ[¥]^
_`abcdefgh
ijklmnopqr
stuvwxyz{|
} → !"#$%&'(
)*+'-./012
3456789:;<
=>?@

When you have finished typing the new password, press Enter. A
verification screen appears. The screen will prompt you to retype your
password for verification.

\

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A A A A A
Retype PWD To Verify

Wait a moment for the entry screen. You will be given clearance to

proceed.

A A A A A
<ENT> TO Proceed

Use the arrow keys to retype your password and press Enter when

finished. Your password will be stored in the microprocessor and the system
will immediately switch to the Analyze screen, and you now have access to
all instrument functions.

If all alarms are defeated, the Analyze screen appears as:

0.0 % Anlz
Range: 0 — 10

If an alarm is tripped, the second line will change to show which alarm

it is:

0.0 % Anlz
AL—1

Note: If you log off the system using the logout function in the

system menu, you will now be required to re-enter the
password to gain access to Span, Zero, Alarm, and Range
functions.

4.3.4 Logout

The Logout function provides a convenient means of leaving the

analyzer in a password protected mode without having to shut the instrument
off. By entering Logout, you effectively log off the instrument leaving the
system protected against use until the password is reentered. To log out,
press the System button to enter the System function.

Contrast Auto—Cal
PSWD Logout More

Contrast Function is DISABLED

(Refer to Section 1.6)

Use the < > arrow keys to position the blinking over the Logout func-

tion, and press Enter to Log out. The screen will display the message:

Protected Until
Password Reentered

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4.3.5 System Self-Diagnostic Test

The Model 3000MB has a built-in self-diagnostic testing routine. Pre­programmed signals are sent through the power supply, output board and
sensor circuit. The return signal is analyzed, and at the end of the test the
status of each function is displayed on the screen, either as OK or as a
number between 1 and 3. (See System Self Diagnostic Test in chapter 5 for
number code.)

The self diagnostics are run automatically by the analyzer whenever the
instrument is turned on, but the test can also be run by the operator at will.
To initiate a self diagnostic test during operation:

Press the System button to start the System function.

Contrast Function is DISABLED

(Refer to Section 1.6)

Contrast Auto—Cal
PSWD Logout More

Use the < > arrow keys to blink More, then press Enter.

Version Self—Test
Cell Output: ### µA

Use the < > arrow keys again to move the blinking to the Self–Test
function. The screen will follow the running of the diagnostic.

RUNNING DIAGNOSTIC
Testing Preamp — 83

During preamp testing there is a countdown in the lower right corner of
the screen. When the testing is complete, the results are displayed.

Power: OK Analog: OK
Preamp: 3

The module is functioning properly if it is followed by OK. A number
indicates a problem in a specific area of the instrument. Refer to Chapter 5
Maintenance and Troubleshooting for number-code information. The results
screen alternates for a time with:

Press Any Key
To Continue...

Then the analyzer returns to the initial System screen.

4.3.6 Version Screen

Move the < > arrow key to More and press Enter. With Version
blinking, press Enter. The screen displays the manufacturer, model, and
software version information.

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4.4 The Span Functions

The analyzer is calibrated using span gas.

NOTE: Zero is not necessary for Percent (%) level measurements.

Additional information on Zero functions is provided in the
Appendix A-6 of this manual.

Although the instrument can be spanned using air, a span gas with a
known oxygen concentration in the range of 70–90% of full scale of the
range of interest is recommended.

Connect the calibration gases to the analyzer according to the instruc­tions given in Section 3.4.1, Gas Connections, observing all the prescribed
precautions.

Shut off the gas pressure before connecting it to the analyzer, and
be sure to limit the pressure to 15 psig or less when turning it back on.

Readjust the gas pressure into the analyzer until the flowrate (as read on
the analyzer’s flowmeter) settles between 300-900 CC/MIN.

If you are using password protection, you will need to enter your
password to gain access to either of these functions. Follow the instructions
in section 4.3.3 to enter your password. Once you have gained clearance to
proceed, you can enter the Zero or Span function.

4.4.1 Span Cal

The Span button on the front panel is used to span calibrate the ana­lyzer. Span calibration can be performed using the automatic mode, where
an internal algorithm compares consecutive readings from the sensor to
determine when the output matches the span gas concentration. Span cali­bration can also be performed manual mode, where the operator determines
when the span concentration reading is acceptable and then manually exits
the function.

4.4.1.1 Auto Mode Spanning

Press Span to enter the span function. The screen that appears allows
you to select whether the span calibration is to be performed automatically or
manually. Use the
settling. Stop when AUTO appears, blinking, on the display.

∆∆

∆∇ arrow keys to toggle between AUTO and MAN span

∆∆

4-10

Span: Settling: AUTO
<ENT> For Next

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Percent Oxygen Analyzer Operation 4

Press Enter to move to the next screen.

Span Val: 20.90
<ENT>Span <UP>Mod #

Use the

the < > arrow keys to blink the digit you are going to modify. Use the

∆∆

∆∇ arrow keys to enter the oxygen-concentration mode. Use

∆∆

∆∆

∆∇

∆∆

arrow keys again to change the value of the selected digit. When you have
finished typing in the concentration of the span gas you are using (20.90 if
you are using air), press Enter to begin the Span calibration.

#### % Span
Slope=#### ppm/s

The beginning span value is shown in the upper left corner of the

display. As the span reading settles, the screen displays and updates informa­tion on Slope. Spanning automatically ends when the slope is less than 1/50
of the displayed value of the oxygen concentration (in ppm) for three min­utes. Then the instrument automatically returns to the analyze mode.

4.4.1.2 Manual Mode Spanning

Press Span to start the Span function. The screen that appears allows

you to select whether the span calibration is to be performed automatically or
manually.

Span: Settling:MAN
<ENT> For Next

Use the ∆∇ keys to toggle between AUTO and MAN span settling.

Stop when MAN appears, blinking, on the display. Press Enter to move to
the next screen.

Span Val: 20.90
<ENT>Span <UP>Mod #

Press ∆ (<UP>) to permit modification (Mod #) of span value.
Use the arrow keys to enter the oxygen concentration of the span gas

you are using (20.90 if you are using air). The < > arrows chose the digit,
and the ∆∇ arrows choose the value of the digit.

Press Enter to enter the span value into the system and begin the span

calibration.

Once the span has begun, the microprocessor samples the output at a

predetermined rate. It calculates the difference between successive samplings
and displays this difference as Slope on the screen. It takes several seconds

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4 Operation Model 3000MB

for the first Slope value to display. Slope indicates rate of change of the
Span reading. It is a sensitive indicator of stability.

#### % Span
Slope=#### ppm/s

When the Span value displayed on the screen is sufficiently stable,
press Enter. (Generally, when the Span reading changes by 1 % or less of
the full scale of the range being calibrated for a period of five minutes it is
sufficiently stable.) Once Enter is pressed, the Span reading changes to the
correct value. The instrument then automatically enters the Analyze func­tion.

4.5 The Alarms Function

The Model 3000MB is equipped with 2 fully adjustable concentration
alarms and a system failure alarm. Each alarm has a relay with a set of form
“C" contacts rated for 3 amperes resistive load at 250 V ac. See Figure in
Chapter 3, Installation and/or the Interconnection Diagram included at the
back of this manual for relay terminal connections.

The system failure alarm has a fixed configuration described in chapter
3 Installation.

The concentration alarms can be configured from the front panel as
either high or low alarms by the operator. The alarm modes can be set as

latching or non-latching, and either failsafe or non-failsafe, or, they can be
defeated altogether. The setpoints for the alarms are also established using

this function.

Decide how your alarms should be configured. The choice will depend
upon your process. Consider the following four points:

1. Which if any of the alarms are to be high alarms and which if any
are to be low alarms?

Setting an alarm as HIGH triggers the alarm when the oxygen
concentration rises above the setpoint. Setting an alarm as LOW
triggers the alarm when the oxygen concentration falls below the
setpoint.

Decide whether you want the alarms to be set as:

• Both high (high and high-high) alarms, or

• One high and one low alarm, or

• Both low (low and low-low) alarms.

4-12

2. Are either or both of the alarms to be configured as failsafe?

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Percent Oxygen Analyzer Operation 4

In failsafe mode, the alarm relay de-energizes in an alarm
condition. For non-failsafe operation, the relay is energized in an
alarm condition. You can set either or both of the concentration
alarms to operate in failsafe or non-failsafe mode.

3. Are either of the alarms to be latching?
In latching mode, once the alarm or alarms trigger, they will

remain in the alarm mode even if process conditions revert to
non-alarm conditions. This mode requires an alarm to be
recognized before it can be reset. In the non-latching mode, the
alarm status will terminate when process conditions revert to non­alarm conditions.

4. Are either of the alarms to be defeated?
The defeat alarm mode is incorporated into the alarm circuit so

that maintenance can be performed under conditions which
would normally activate the alarms.

The defeat function can also be used to reset a latched alarm.
(See procedures, below.)

If you are using password protection, you will need to enter your

password to access the alarm functions. Follow the instructions in section

4.3.3 to enter your password. Once you have clearance to proceed, enter the
Alarm function.

Press the Alarm button on the front panel to enter the Alarm function.

Make sure that AL–1 is blinking.

AL—1 AL—2
Choose Alarm

Set up alarm 1 by moving the blinking over to AL–1 using the < >

arrow keys. Then press Enter to move to the next screen.

AL—1 1.00 % HI
Dft—N Fs—N Ltch—N

Five parameters can be changed on this screen:

• Value of the alarm setpoint, AL–1 #### % (oxygen)

• Out-of-range direction, HI or LO

• Defeated? Dft–Y/N (Yes/No)

• Failsafe? Fs–Y/N (Yes/No)

• Latching? Ltch–Y/N (Yes/No).

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4 Operation Model 3000MB

• To define the setpoint, use the < > arrow keys to move the

blinking over to AL–1 ####. Then use the ∆∇ arrow keys to
change the number. Holding down the key speeds up the
incrementing or decrementing. (Remember, the setpoint units are
percent-of-oxygen.)

• To set the other parameters use the < > arrow keys to move the

blinking over to the desired parameter. Then use the ∆∇ arrow
keys to change the parameter.

• Once the parameters for alarm 1 have been set, press Alarms
again, and repeat this procedure for alarm 2 (AL–2).

• To reset a latched alarm, go to Dft– and then press either ∆ two
times or ∇ two times. (Toggle it to Y and then back to N.)

–OR –

Go to Ltch– and then press either ∆ two times or ∇ two times.
(Toggle it to N and back to Y.)

4.6 The Range Function

The Range function allows the operator to program up to three concen­tration ranges to correlate with the DC analog outputs. If no custom ranges
are defined by the user, the instrument defaults to:

Low = 0–1.00 %
Med = 0–5.00 %
High = 0–10.00 %.

The Model 3000MB is set at the factory to default to autoranging. In
this mode, the microprocessor automatically responds to concentration
changes by switching ranges for optimum readout sensitivity. If the current
range limits are exceeded, the instrument will automatically shift to the next
higher range. If the concentration falls slightly below full scale of the next
lower range, the instrument will switch to that range. A corresponding shift
in the DC percent-of-range output, and in the range ID outputs, will be
noticed.

The autoranging feature can be overridden so that analog output stays
on a fixed range regardless of the oxygen concentration detected. If the
concentration exceeds the upper limit of the range, the DC output will
saturate at 1 V dc.

However, the digital readout and the RS-232 output of the concentra­tion are unaffected by the fixed range. They continue to read accurately with
full precision. See Front Panel description in Chapter 1.

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Percent Oxygen Analyzer Operation 4

4.6.1 Setting the Analog Output Ranges

To set the ranges, enter the range function mode by pressing the

Range button on the front panel.

L—1.00 M—5.00
H—10.00 Mode—AUTO

Use the < > arrow keys to blink the range to be set: low (L), medium

(M), or high (H).

Use the ∆∇ arrow keys to enter the upper value of the range (all ranges
begin at 0 %). Repeat for each range you want to set. Press Enter to accept
the values and return to Analyze mode. (See note below.)

Note: The ranges must be increasing from low to high. For example,

if range 1 is set as 0–1 % and range 2 is set as 0–10 %, range 3
cannot be set as 0–5 % since it is lower than range 2.

4.6.2 Autoranging Analysis

Set your analysis ranges as in 4.6.1, above. Leave Mode in Auto, or use
the arrow buttons to change back to Auto.

When operating in autoranging, if the oxygen concentration in your
sample goes ABOVE your HIGHEST range setting, the analyzer will go
into the special 25 % cal range.

However, if one of your range settings is below 0-25 % and another is
set above 0-25 %, the special 0-25 % Air Cal range will NOT activate as the
oxygen level goes through 25 %. Nevertheless, if the oxygen concentration
in your sample goes ABOVE your HIGHEST range setting, the analyzer
will THEN drop back down into the special 25 % cal range.

Once the oxygen concentration drops back down into your highest
range setting, the analyzer will automatically switch back to that range.

CAUTION: While the analyzer is in the Air Cal range, the oxygen

reading cannot go over 25 %, even if the oxygen
concentration is higher than 25 %.

4.6.3 Fixed Range Analysis

The autoranging mode of the instrument can be overridden, forcing the
analyzer DC outputs to stay in a single predetermined range.

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4 Operation Model 3000MB

To switch from autoranging to fixed range analysis, enter the range

function by pressing the Range button on the front panel.

Use the < > arrow keys to move the blinking over AUTO.
Use the ∆∇ arrow keys to switch from AUTO to FX/LO, FX/MED, or FX/

HI to set the instrument on the desired fixed range (low, medium, or high).

L—1.00 M—5.00
H—10.00 Mode—FX/LO

or

L—1.00 M—5.00
H—10.00 Mode—FX/MED

or

L—1.00 M—5.00
H—10.00 Mode—FX/HI

Press Escape to re-enter the Analyze mode using the fixed range.

NOTE:When performing analysis on a fixed range, if the oxygen

concentration rises above the upper limit (or default value) as
established by the operator for that particular range, the
output saturates at 1 V dc. However, the digital readout and
the RS-232 output continue to read the true value of the oxy­gen concentration regardless of the analog output range.

4.7 The Analyze Function

Normally, all of the functions automatically switch back to the Analyze

function when they have completed their assigned operations. Pressing the

Escape button in many cases also switches the analyzer back to the Ana­lyze function. Alternatively, you can press the Analyze button at any time

to return to analyzing your sample.

4.8 Signal Output

The standard Model 3000MB Percent Oxygen Analyzer is equipped
with two 0–1 V dc analog output terminals accessible on the back panel (one
concentration and one range ID). The –MA option also has two isolated 4–
20 mA dc current outputs (one concentration and one range ID).

4-16

See Rear Panel in Chapter 3, Installation, for illustration.

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Percent Oxygen Analyzer Operation 4

The signal output for concentration is linear over the currently selected
analysis range. For example, if the analyzer is set on range that was defined
as 0–10 % O2, then the output would be:

Voltage Signal Current Signal

% O

2

Output (V dc) Output (mA dc)

0 0.0 4.0
1 0.1 5.6
2 0.2 7.2
3 0.3 8.8
4 0.4 10.4
5 0.5 12.0
6 0.6 13.6
7 0.7 15.2
8 0.8 16.8
9 0.9 18.4

10 1.0 20.0

The analog output signal has a voltage which depends on the oxygen
concentration AND the currently activated analysis range. To relate the
signal output to the actual concentration, it is necessary to know what range
the instrument is currently on, especially when the analyzer is in the
autoranging mode.

To provide an indication of the range, a second pair of analog output
terminals are used. They generate a steady preset voltage (or current if you
have current outputs) to represent a particular range. The following table
gives the range ID output for each analysis range:

Range Voltage (V) Current (mA)

LO 0.25 8
MED 0.50 12
HI 0.75 16
CAL (0-25%) 1.00 20

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4 Operation Model 3000MB

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Percent OxygenAnalyzer Maintenance 5

5.0 Maintenance

Aside from normal cleaning and checking for leaks at the gas connec­tions, routine maintenance is limited to replacing filter elements and fuses,
and recalibration.

WARNING: SEE WARNINGS ON THE TITLE PAGE OF THIS

MANUAL.

5.1 Replacing the Fuse

Remove Power to Unit before replacing the
fuse.

- Push and turn the Fuse Holder 1/2 turn to the left.

- Remove the old fuse, and

- Assemble in thenew fuse in reverse order

Figure 5-1: Fuse holder, 3AG Type

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5 Maintenance Model 3000MB

5. 2 System Self Diagnostic Test

1. Press the system button to enter the system mode

2. Use the < > arrow keys to move to More, and press Enter.

3. Use the < > arrow keys to move to Self-Test, and press Enter.
The following failure codes apply:

Table 5.2: Self-Test Failure Codes

Power

0OK
1 5V Failure
2 15V Failure
3 Both Failed

Analog

0OK
1 DAC A (0-1V Concentration)
2 DAC B (0-1V Range ID)
3 Both Failed

Preamp

0OK
1 Zero too High
2 Amplifier dosen't match test input
3 Both Failed

5.3 Major Internal Components

The paramagnetic cell, and other internal components are
accessed by opening the front door, and unlatching and swinging
open the front panel, as described earlier.

Warnings: See warnings on the title page of this

manual for details.

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Percent OxygenAnalyzer Maintenance 5

The 3000MB contains the following major components:

Paramagnetic Sensor
2 x Power Supplies
Microprocessor
Displays

5 Digit, LED Meter.
2 line, 20 character, alphanumeric, VFD display.

5.4 Cleaning

If the instrument is unmounted at the time of cleaning, disconnect
the instrument form its power source. Close and latch the front
panel, and front door. Clean outside surfaces with a soft cloth
dampened slightly with plain clean water. Do not use harsh
solvents such as paint thinner or benzene.

For mounted instruments, clean the front panel as described in the
above paragraph. DO NOT wipe front panel while the
instrument is controlling your process.

5.5 Troubleshooting
Problem:

Erratic reading of the oxygen concentration by the analyzer.

Possible Cause:

The analyzer may have been calibrated in an inaccurate fashion.

Solution:

Turn the analyzer off, then back on again. Press the System key
when prompted by the analyzer "press system for default values".
This will return your analyzer to it's default settings in calibration
and zero values. If erratic behavior continues replace the sensor.

Possible Cause:

Atmospheric Oxygen may be diffusing in through the vent, and
affecting the oxygen level which the sensor sees.

Solution:

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5 Maintenance Model 3000MB

Increase the flow rate and/or length of tubing in order to dilute or
minimize the diffusion of oxygen from the vent back to the analyzer.

Problem:
Inaccurate zero operation (i.e. the user has zeroed the analyzer

accidentally on gas much higher than one would normally use for
zero gas.

Solution:
Turn the analyzer off, then back on again. Press the system key when

prompted by the analyzer "press system for default values". This will
return the analyzer to it's default settings in calibration and zero
values. Now proceed to carefully calibrate and zero the analyzer.

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Teledyne Analytical Instruments

Percent Oxygen Analyzer Appendix

Appendix

A-1 Model 3000MB Specifications

Packaging: General Purpose

• Nema 4 rated bulkhead mount enclosure.

Sensor: Paramagnetic Sensor

90 % Response Time: 10 seconds at 25 °C (77 °F).

Ranges: Three user definable ranges from 0-1 % to

0-100 %, plus air calibration range of 0-25 %.

Alarms: One system-failure alarm contact to detect

power failure.
Two adjustable concentration threshold alarms

with fully programmable setpoints.

Displays: 2 line by 20 character, alphanumeric, VFD

screen.
One 5 digit LED display.

Digital Interface: Full duplex RS-232 communications port.

Power: Universal power supply 100-240 VAC, at 50/

60 Hz.

Operating Temperature: 0-45 °C (32-113 °F).

Accuracy: ±1% of full scale at constant temperature.

±5% of full scale over operating temperature
range, on factory default analysis ranges, once
thermal equilibrium has been reached.

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Appendix Model 3000MB

Analog outputs: 0-1 V dc percent-of-range (Standard)

0-1 V dc range ID (Standard)
4-20 mA dc—isolated— percent-of-range
(Optional)
4-20 mA dc—isolated— range ID (Optional)

Dimensions: 20.5” High x 13” Wide x 9” Tall

(52.1 cm x 33 cm x 22.9 cm)

A-2 Recommended 2-Year Spare Parts List

Qty Part Number Description

1 C62374 Back Panel Board
1 C62371-B Front Panel Board
1 C670043 Percent Preamplifier Board
1* C62365-C Main Computer Board (std)
1* C62365-A Main Computer Board (4-20 mA)
3 F10 Fuse, 2 A, 250 V, 3 AG, Slow Blow
2 F73 Ferrule 1/4” SS
2 F74 Ferrule 1/4” SS
2 N73 Nut 1/4” SS
1 A68729 Restrictor Kit
1 V11 Union SS 1/4”

NOTE: Orders for replacement parts should include the part number (if

available) and the model and serial number of the instrument for
which the parts are intended.

Orders should be sent to:

TELEDYNE Analytical Instruments

16830 Chestnut Street
City of Industry, CA 91749-1580

Phone [phone], Fax [phone]
TWX [phone] TDYANYL COID

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

A-2

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Percent Oxygen Analyzer Appendix

A-3 Drawing List

D-73375 Outline Drawing
D-73374 Interconnection Diagram

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A-3