Teledyne 3010PAC User Manual

Oxygen Analyzer

OPERATING INSTRUCTIONS

Model 3010PAC

Percent Oxygen Analyzer

Flush Mount Control Unit, PN D-66192B

CENELEC Type Remote Probe, PN B-39923C

Intrinsic Safe Barriers Assy., PN C-66426

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

P/N M66395

08/06/99

ECO # 99-0323

i

Model 3010PAC

Copyright © 1999 Teledyne Analytical Instruments

All Rights Reserved. No part of this manual may be reproduced, transmitted,
transcribed, stored in a retrieval system, or translated into any other language or computer
language in whole or in part, in any form or by any means, whether it be electronic,
mechanical, magnetic, optical, manual, or otherwise, without the prior written consent of
Teledyne Analytical Instruments, 16830 Chestnut Street, City of Industry, CA 91749-

1580.

Warranty

This equipment is sold subject to the mutual agreement that it is warranted by us
free from defects of material and of construction, and that our liability shall be limited to
replacing or repairing at our factory (without charge, except for transportation), or at
customer plant at our option, any material or construction in which defects become
apparent within one year from the date of shipment, except in cases where quotations or
acknowledgements provide for a shorter period. Components manufactured by others bear
the warranty of their manufacturer. This warranty does not cover defects caused by wear,
accident, misuse, neglect or repairs other than those performed by 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.

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

Oxygen Analyzer

Table of Contents

Specific Model Information..................................iv

Preface ................................................................v

Part I: Control Unit, Model PAC.............Part I: 1-1

Part II: Intrinsic Safe Barriers ...............Part II: 1-1

Remote Probe ...........................................

Appendix......................................................... A-1

Teledyne Analytical Instruments

iii

Model 3010PAC

Specific Model Information

The instrument for which this manual was supplied may incorporate
one or more options not supplied in the standard instrument. Commonly
available options are listed below, with check boxes. Any that are incorpo­rated in the instrument for which this manual was supplied are indicated by a
check mark in the box.

Instrument Serial Number: __________________________

❏ 19" Rack Mount

The 19" Relay Rack Mount units are available with either
one or two series 3010PAC analyzer Control Units in­stalled in a standard 19" panel and ready to mount in a
standard rack. See Appendix for details.

❏ Cell Class* ____________________ (B-1 standard).

Enter Class Designation

* See Part II, Chapter 2 and/or any addendum that may be attached

to this manual for cell specifications.

iv

Teledyne Analytical Instruments

Oxygen Analyzer

Preface

Overview

The Analytical Instruments Model 3010PAC Percent Oxygen Analyzer
is a versatile microprocessor-based instrument for detecting oxygen in a
variety of background gases. It is a “split architecture” instrument. This
means that a general purpose Control Unit, designed for nonhazardous areas
only, remotely controls a specially designed Analysis Unit, or remote probe,
that can operate in a hazardous area.

Part I of this manual covers the Model 3010PAC General Purpose flush­panel and/or rack-mount Control Unit only. This Control Unit is for indoor
use in a nonhazardous environment. The Analysis Units (or Remote Probes)
they control, can be designed for a variety of hazardous environments. Part II
of this manual covers the 3010PAC Analysis Unit.

Typical Applications

A few typical applications of the Model 3010PAC are:

• Monitoring inert gas blanketing

• Air separation and liquefaction

• Chemical reaction monitoring

• Semiconductor manufacturing

• Petrochemical process control

• Quality assurance

• Gas analysis certification.

Teledyne Analytical Instruments

v

Model 3010PAC

Model and Part Number Designations

The part numbers are the most specific identification. When using this
manual for operation, maintenance, or ordering parts, check the part numbers
on your Instruments to be sure of a match. Where an underscore (_) appears in
a model number, the unit has more than one application. For example,
3010P_C means that the same unit is part of the 3010PAC and the 3010PBC
models.

3010TA: NEC Type Trace Oxygen Analyzer with flush mount Control

Unit. Consists of 3010TA Control Unit, PN D-64596A and a
3010T Analysis Unit, PN D-65478.

3010PA: NEC Type Percent Oxygen Analyzer with flush mount

Control Unit. Consists of 3010PA Control Unit, PN

D-64596B or C and a 3010P Analysis Unit, PN D-65479.

3010TB: NEC type Trace Oxygen Analyzer with bulkhead mount

Control Unit. Consists of 3010TB/PB Control Unit, PN
D-66190A, and a 3010T Analysis Unit, PN D-65478.

3010PB: NEC type Percent Oxygen Analyzer with bulkhead mount

Control Unit. Consists of 3010TB Control Unit, PN D-66190
B or C, and a 3010T Analysis Unit, PN D-65479.

3010TAC: CENELEC type Trace Oxygen Analyzer with flush mount

Control Unit. Consists of 3010TA Control Unit, PN
D-66192A, and a 3010T_C Analysis Unit, PN C-66336

3010PAC: CENELEC type Percent Oxygen Analyzer with flush mount

Control Unit. Consists of 3010PA Control Unit, PN D-66192
B or C, and a 3010P_C Analysis Unit, PN B-39923C

3010TBC: CENELEC type Trace Oxygen Analyzer with bulkhead

mount Control Unit. Consists of 3010TB Control Unit, PN
D-66194A, and a 3010T_C Analysis Unit, PN C-66336

3010PBC: CENELEC type Percent Oxygen Analyzer with bulkhead

mount Control Unit. Consists of 3010PB Control Unit, PN
D-66194 B or C, and a 3010P_C Analysis Unit, PN
B-39923C

Options: See Specific Model Information sheet, on page iv for details.

vi

Teledyne Analytical Instruments

Oxygen Analyzer

Main Features of the Analyzer

The Model 3010PAC series Oxygen Analyzers are sophisticated yet

simple to use. The main features of these analyzers 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
0-1 % levels through 0-100 %. Large, bright, meter readout.

• Optional stainless steel cell block available.

• Advance design Micro-Fuel Cell sensor with a one year
warranty and an expected lifetime of two years.

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

• 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.

• 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 communications device.

• Analog outputs for Concentration and Analysis Range: 0–1 V dc
standard. Additional isolated 4–20 mA dc optional.

• Compact and versatile design: flush-panel, rack-mountable, or
bulkhead mounted Control Units available.

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vii

Model 3010PAC

Model 3010PAC complies with all of the requirements of the
Commonwealth of Europe (CE) for Radio Frequency Interference,
Electromagnetic Interference (RFI/EMI), and Low Voltage Directive
(LVD).

The Analysis Unit is Intrinsically safe and CENELEC approved.
The Control Unit is suitable for general purpose areas. The probe is
CENELEC approved (certification code EEXIA IICT6).

The following International Symbols are used throughout the
Instruction Manual for your visual and immediate warnings and when
you have to attend CA UTION while operating the instrument:

STAND-BY, Instrument is on Stand-by,
but circuit is active

GROUND

Protective Earth

CAUTION, The oper ator needs to ref er to the

manual for further information. F ailure to do
so may compromise the saf e operation of the
equipment.

CAUTION, Risk of Electric Shock

viii

Teledyne Analytical Instruments

Part I: Control Unit

OPERATING INSTRUCTIONS

Models 3010PAC

Oxygen Analyzer

Part I

Control Unit

Flush Mount

Part Number: D-66192B

Teledyne Analytical Instruments

Part I: i

Model 3010PAC Oxygen Analyzer

Table of Contents

1 Introduction

1.1 Overview........................................................................ 1-1

1.2 Control Unit Front Panel................................................. 1-1

1.3 Recognizing Difference Between LCD & VFD............... 1-3

1.4 Control Unit Rear Panel................................................. 1-3

2 Operational Theory

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

2.2 Electronics and Signal Processing ................................ 2-1

3 Installation

3.1 Unpacking the Control Unit............................................ 3-1

3.2 Mounting the Control Unit .............................................. 3-1

3.3 Electrical Connections................................................... 3-3

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

3.3.2 50-Pin Interface Connector ................................... 3-4

3.3.3 RS-232 Port ......................................................... 3-9

3.3.4 Remote Probe Connection................................... 3-10

3.4 Testing the System......................................................... 3-11

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 Display...................................................... 4-4

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

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

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

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

ii: Part I

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Part I: Control Unit

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

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

4.3.6 V ersion Screen ...................................................... 4-10

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

4.4.1 Cell Failurel ........................................................... 4-10

4.4.2 Span Cal................................................................ 4-11

4.4.2.1 Auto Mode Spanning ..................................... 4-11

4.4.2.2 Manual Mode Spanning................................. 4-12

4.5 The Alarms Function...................................................... 4-13

4.6 The Range Function ...................................................... 4-15

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

4.6.2 Fixed Range Analysis ............................................ 4-16

4.7 The Analyze Function.................................................... 4-17

4.8 Signal Output ................................................................. 4-17

5 Maintenance

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

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

5.3 Major Internal Components............................................ 5-3

5.4 Cleaning ........................................................................ 5-4

Teledyne Analytical Instruments

Part I: iii

Model 3010PAC Oxygen Analyzer

iv: Part I

Teledyne Analytical Instruments

Oxygen Anal yzer Part I: Control Unit

Introduction

1.1 Overview

The Analytical Instruments Model 3010PAC Analyzer Control Unit,
together with a 3010PAC Analysis Unit, is a versatile microprocessor­based instrument for detecting percent amounts of oxygen in a variety of
gases.

Part I, this part, of this manual covers the Model 3010PAC series
General Purpose flush-panel and/or rack-mount Control Units. (The Analy­sis Unit is covered in Part II of this manual.) The Control Unit is for indoor
use in a nonhazardous environment only. The Analysis Units (or Remote
Probes) it controls can be designed for a variety of hazardous environ­ments.

1.2 Control Unit Front Panel

The standard 3010PAC Control Unit is housed in a rugged metal case
with all remote controls and displays accessible from the front panel. See
Figure 1-1. The front panel has a digital meter, an alphanumeric display,
and thirteen buttons for operating the analyzer.

Teledyne Analytical Instruments

Part I: 1-1

1 Introduction Model 3010PAC

Figure 1-1: Front of Unmounted Control Unit

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 the VFD screen.

• Up & Down Arrows Increment or decrement values of

functions currently displayed.

1-2: Part I

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Oxygen Anal yzer Part I: Control Unit

• 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.
It is accurate across all analysis ranges from 0-1 % through 0-100 %

Alphanumeric Interface Screen: The backlit VFD screen is an easy-

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

Standby Button: The red I/O button switches the instrument

power between I (ON) and O (a Keep-Alive state). In the O state, the
instrument’s circuitry is operating, but there are no displays or outputs.

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 .

Access Door: For access to the front panel electronics, 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
and other electronics requires unfastening the rear panel screws and sliding
the unit out of the case.

1.3 Recognizing Difference Between LCD & VFD

LCD has GREEN background with BLACK characters. VFD has
DARK background with GREEN characters. In the case of VFD - NO
CONTRAST ADJUSTMENT IS NEEDED.

1.4 Control Unit Rear Panel

The Control Unit rear panel, shown in Figure 1-2, contains the
electrical connectors for external inputs and outputs. The input/output
functions are described briefly here and in detail in the Installation chapter
of this manual.

Teledyne Analytical Instruments

Part I: 1-3

1 Introduction Model 3010PAC

Figure 1-2: Model 3010PAC Rear Panel

• Power Connection Universal AC power source.

• Analog Outputs 0-1 V dc concentration and 0-1 V dc

range ID. Optional isolated 4-20 mA dc
and 4-20 mA 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 Provides all electrical interconnect to

the Analysis Unit or Remote Probe.

• 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.

1-4: Part I

Teledyne Analytical Instruments

Oxygen Anal yzer Part I: Control Unit

• Remote Probe Interfaces with an Analysis Unit or

Remote Probe (external sensor/sample
system).

• Network I/O Serial digital communications for local

network access. For future expansion.
Not implemented at this printing.

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

Auto-Cal control where possible. The internal clock in the
Model 3010PAC is accurate to 2-3 %. Accordingly, internally
scheduled calibrations can vary 2-3 % per day.

Teledyne Analytical Instruments

Part I: 1-5

1 Introduction Model 3010PAC

1-6: Part I

Teledyne Analytical Instruments

Oxygen Anal yzer Part I: Control Unit

Operational Theory

2.1 Introduction

The Model 3010PAC Oxygen Analyzer Control Unit 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 Model
3010PAC analyzer. (The sample system and Micro-Fuel Cell sensor are
covered in Part II, Analysis Unit, in this manual.) System power is supplied
from a universal power supply module designed to be compatible with any
international power source.

2.2 Electronics and Signal Processing

All of the Analyzer electronics are located on Printed Circuit Board
(PCB) assemblies inside the Control Unit chassis. The PCB locations are
illustrated in section 5, Maintenance.

Refer to Figure 2-1, Block Diagram of the 3010PAC CU Electronics:

In the presence of oxygen, the sensor (in the Analysis Unit) generates
a current. A current to voltage amplifier (in the Control Unit) converts this
current to a voltage.

The second stage amplifier amplifies the voltage. It also uses a signal
from the thermistor (which is physically located in the Analysis Unit cell
block) to provide temperature compensation for the sensor signal. The
thermistor is a temperature dependent resistance that changes the gain of
the amplifier in proportion to the temperature changes in the block. This
thermistor signal compensates for the change in the cell output due to the
temperature changes. The result is a signal that is temperature independent.
The output from the second stage amplifier is sent to an 18-bit analog to
digital converter controlled by the microprocessor.

Teledyne Analytical Instruments

Part I: 2-1

2 Operational Theory Model 3010PAC

Figure 2-1: Block Diagram of the 3010PAC CU Electronics

2-2: Part I

Teledyne Analytical Instruments

Oxygen Anal yzer Part I: Control Unit

The digital concentration signal—along with input from the control
panel—is processed by the microprocessor, and appropriate control signals
are directed to the display, alarms and communications port as well as to
the optional gas control valves in the Analysis Unit.

The same digital information is also sent to a 12 bit digital to analog
converter that produces the 0-1 V dc and the optional 4-20 mA dc analog
concentration signal outputs, and the analog range ID outputs.

The microprocessor monitors the power supply, and activates the
system failure alarm if a malfunction is detected.

Teledyne Analytical Instruments

Part I: 2-3

2 Operational Theory Model 3010PAC

2-4: Part I

Teledyne Analytical Instruments

Oxygen Anal yzer Part I: Control Unit

Installation

Installation of Model 3010PAC Analyzers includes:

1. Unpacking, mounting, and interconnecting the Control Unit and
the Analysis Unit

2. Making gas connections to the system

3. Making electrical connections to the system

4. Testing the system.

This chapter covers installation of the Control Unit. (Installation of

the Analysis Unit is covered in Part II of this manual.)

3.1 Unpacking the Control Unit

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

3.2 Mounting the Control Unit

The Model 3010PAC Control Unit is for indoor use in a general
purpose area. It is NOT for hazardous environments of any type.

The standard model is designed for flush panel mounting. Figure 3-1
is an illustration of a Model 3010PAC standard Control Unit front panel
and mounting bezel. There are four mounting holes—one in each corner of
the rigid frame. Drawing number D-64596, at the back of this manual,
contains a panel cutout diagram.

On special order, a 19" rack-mounting can be provided. Per order, one
or two 3010PAC series Control Units are flush-panel mounted on the 19"
rack panel. See Figure 3-2.

Part I: 3-1 Teledyne Analytical Instruments

3 Installation Model 3010PAC

Figure 3-1: Front Panel of the Model 3010 Control Unit

Figure 3-2: Single and Dual 19" Rack Mounts

All operator controls are mounted on the control panel, which is
hinged on the left edge and doubles as a door to provide access to the
internal components of the instrument. The door is spring loaded and will
swing open when the button in the center of the latch (upper right corner)

3-2: Part I

Teledyne Analytical Instruments

Oxygen Anal yzer Part I: Control Unit

is pressed all the way in with a narrow gauge tool (less than 0.18 inch
wide), such as a small hex wrench or screwdriver Allow clearance for the
door to open in a 90-degree arc of radius 7.625 inches. See Figure 3-3.

Figure 3-3: Required Front Door Clearance

3.3 Electrical Connections

Figure 3-4 shows the Control Unit rear panel. Connections for power,
communications, and both digital and analog signal outputs are described
in the following paragraphs. Wire size and maximum length data appear in
the Drawings in the back of this manual.

Figure 3-4: Rear Panel of the Model 3010PAC Control Unit

For safe connections, no uninsulated wiring should be able to come in
contact with fingers, tools or clothing during normal operation.

Part I: 3-3 Teledyne Analytical Instruments

3 Installation Model 3010PAC

CAUTION: Use Shielded Cables. Also, use plugs that provide

excellent EMI/RFI protection. The plug case must
be connected to the cable shield, and it must be
tightly fastened to the analyzer with its fastening
screws. Ultimately, it is the installer who ensures
that the connections provide adequate EMI/RFI
sielding.

3.3.1 Primary Input Power

The universal power supply requires a 85–250 V ac, 47-63 Hz power
source. The power cord receptacle and fuse block are located in the same
assembly. Insert the female plug end of the power cord into the power cord
receptacle.

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

long as the instrument is connected to the power
source. The switch on the front panel is for
switching power on or off to the displays and

outputs only.

Fuse Installation: The fuse block, at the right of the power cord
receptacle, accepts US or European size fuses. A jumper replaces the fuse
in whichever fuse receptacle is not used. 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.)

3.3.2 50-Pin Equipment Interface Connector

Figure 3-4 shows the pin layout of the Equipment Interface connector.
The arrangement is shown as seen when the viewer faces the rear panel of
the analyzer. The pin numbers for each input/output function are given
where each function is described in the paragraphs below.

Figure 3-4: Equipment Interface Connector Pin Arrangement

3-4: Part I

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Oxygen Anal yzer Part I: Control Unit

Analog Outputs: There are four DC output signal pins—two pins

per output. For polarity, see Table 3-1. The outputs are:
0–1 V dc % of Range: Voltage rises linearly with increasing oxygen,

from 0 V at 0 ppm to 1 V at full scale ppm. (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: Current increases linearly with increasing oxygen,

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

4–20 mA dc Range ID: 8 mA = Low Range, 12 mA = Medium Range, 16

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

Table 3-1: Analog Output Connections

Pin Function

3 + Range ID, 4-20 mA, floating
4 – Range ID, 4-20 mA, floating
5 + % Range, 4-20 mA, floating
6 – % Range, 4-20 mA, floating

8 + Range ID, 0-1 V dc
23 – Range ID, 0-1 V dc, negative ground
24 + % Range, 0-1 V dc

7 – % Range, 0-1 V dc, negative ground

Alarm Relays: The three alarm-circuit connectors are spring termi-

nals 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. 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).

Part I: 3-5 Teledyne Analytical Instruments