Rosemount 880 NDIR Analyzer-Rev N Manuals & Guides

Rosemount Analytical

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ODEL

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NFRARED ANALYZER

I

NSTRUCTION MANUAL

ON

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880

ISPERSIVE

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This Model 880 instruction manual is for use with instruments with a software version of 2.0 or greater.

The information contained in this document is subject to change without notice.

Irtran is a Registered Trademark of Eastman Kodak Co.
Pyrex is a Registered Trademark of Corning Glass Works
Teflon and Viton are Registered Trademarks of E.I. duPont de Nemours and Co., Inc.
SNOOP is a Registered Trademark of NUPRO Co.
Model SGD Series-710 Standard Gas Divider is a Registered Trademark of STEC Inc.

Manual Part Number 748176-N
July 1998
Printed in U.S.A.

Rosemount Analytical Inc.

4125 East La Palma Avenue

Anaheim, California 92807-1802

C

ONTENTS

PREFACE

SAFETY SUMMARY ..........................................................................................P-1

SPECIFICATIONS..............................................................................................P-3

SPECIFICATIONS - OPTIONS ..........................................................................P-5

CUSTOMER SERVICE, TECHNICAL ASSISTANCE AND FIELD SERVICE....P-6

RETURNING PARTS TO THE FACTORY.........................................................P-6

TRAINING ......................................................................................................P-6

DOCUMENTATION............................................................................................P-6

QUICK STARTUP AND TROUBLESHOOTING GUIDE.....................................P-7

S

ECTION

1.1 GENERAL DESCRIPTION........................................................................1-1

1.2 AVAILABLE OPTIONS..............................................................................1-1

1. I

NTRODUCTION

SECTION 2. UNPACKING AND INSTALLATION

2.1 UNPACKING............................................................................................2-1

2.2 LOCATION...............................................................................................2-1

2.3 VOLTAGE REQUIREMENTS...................................................................2-1

2.4 ELECTRICAL CONNECTIONS................................................................2-3

2.4.1 Line Power Connections..............................................................2-4

2.4.2 Recorder Connections.................................................................2-4

2.5 SAMPLE AND REFERENCE INLET/OUTLET CONNECTIONS..............2-4

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S

ECTION

2.6 CALIBRATION GAS REQUIREMENTS................................................... 2-4

2.7 SAMPLE HANDLING SYSTEM...............................................................2-4

2.8 LEAK TEST PROCEDURE...................................................................... 2-5

2.9 SAMPLE FLOW RATE ............................................................................ 2-6

2.10 DIFFERENTIAL ANALYSIS WITH FLOW-THROUGH

2.11 OPTION BOARDS................................................................................... 2-7

2.12 ORDERING OPTION KITS.................................................................... 2-11

2. (

2.11.1 Alarm Connections................................................................... 2-7

2.11.2 Current Output Option Connections......................................... 2-8

2.11.3 Calibration Gas Control Connections....................................... 2-9

2.11.4 Auto Zero/Span Connections................................................... 2-9

2.11.5 Remote Input/Output Connections........................................... 2-10

CONTINUED

REFERENCE CELL...................................................................... 2-7

)

SECTION 3. INITIAL STARTUP AND CALIBRATION

3.1 LEAK TEST.............................................................................................. 3-1

3.2 POWER VERIFICATION ......................................................................... 3-1

3.3 SOFTWARE VERSION ........................................................................... 3-1

3.4 FRONT PANEL INDICATORS AND CONTROLS ................................... 3-1

3.4.1 Display 3-1

3.4.2 Function Keys............................................................................. 3-3

3.4.3 User-Programmable Keys.......................................................... 3-4

3.4.4 Run Mode Display...................................................................... 3-5

3.4.5 General Display Information....................................................... 3-5

3.5 ACCESSING MODE DISPLAYS.............................................................. 3-6

3.6 SECURITY CODE.................................................................................... 3-6

3.7 RANGE PARAMETERS........................................................................... 3-10

3.8 ANALYZER DIAGNOSTICS .................................................................... 3-13

3.9 ZERO CALIBRATION.............................................................................. 3-13

3.9.1 Hardware and Software Zero..................................................... 3-13

3.9.2 Calibrating the Analyzer with Zero Gas...................................... 3-14

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SECTION 3. (CONTINUED)

3.10 ZERO CALIBRATION FOR THE ANALYZER WITH THE CAL GAS

CONTROL OPTION......................................................................3-17

3.10.1 Calibrating the Analyzer with the Calibration Gas Control

Option with Zero Gas....................................................3-17

3.11 SPAN CALIBRATION..............................................................................3-17

3.11.1 Hardware and Software Settings for Span Gas........................3-17

3.11.2 Calibrating the Analyzer with Span Gas....................................3-18

3.12 SPAN CALIBRATION FOR THE ANALYZER WITH THE CAL GAS

CONTROL OPTION......................................................................3-19

3.13 LINEARIZATION .....................................................................................3-20

3.14 ALARM OPTION .....................................................................................3-24

3.14.1 STATUS Display.......................................................................3-26

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3.15 CURRENT OUTPUT OPTION.................................................................3-26

3.16 AUTO ZERO/SPAN OPTION..................................................................3-27

3.17 REMOTE RANGE INPUT/OUTPUT OPTION .........................................3-30

S

ECTION

4.1 ROUTINE OPERATION ............................................................................4-1

4.2 RECOMMENDED CALIBRATION FREQUENCY .....................................4-1

4.3 SHUTDOWN .............................................................................................4-1

4.4 DETECTION SYSTEM THEORY..............................................................4-1

4. R

OUTINE OPERATION AND THEORY

SECTION 5. TROUBLESHOOTING

5.1 ERROR CODE SUMMARY......................................................................5-1

5.2 OSCILLATOR TUNE ADJUSTMENT.......................................................5-2

5.3 PREAMP GAIN.........................................................................................5-2

5.4 SOURCE BALANCE SHUTTER ADJUSTMENT......................................5-3

5.5 SOURCE CURRENT ADJUSTMENT.......................................................5-3

5.6 VOLTAGE CHECKS.................................................................................5-3

5.7 DIGITAL GAIN ADJUSTMENT.................................................................5-3

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SECTION 5. (CONTINUED)

5.8 CASE HEATER TEMPERATURE CONTROL.........................................5-4

5.9 DETECTOR HEATER.............................................................................. 5-4

SECTION 6. ROUTINE SERVICING

6.1 CELL REMOVAL, CLEANING AND INSTALLATION.............................. 6-1

6.2 CELL DESICCANT .................................................................................. 6-2

6.3 SOURCE REPLACEMENT...................................................................... 6-2

6.4 SOURCE BALANCE SHUTTER ADJUSTMENT..................................... 6-3

6.5 CHOPPER MOTOR ASSEMBLY (PN 658313)....................................... 6-3

6.6 MICROBOARD REPLACEMENT ............................................................ 6-3

6.7 DETECTOR REMOVAL........................................................................... 6-4

6.8 ELECTRONIC CIRCUITRY ..................................................................... 6-4

6.8.1 Oscillator Circuit Board and Associated Elements of Amplitude-

Modulation Circuit......................................................... 6-4

6.8.2 Functioning of Modulation System in TUNE Mode...................... 6-5

6.8.3 Functioning of Modulation System in Operating Mode................ 6-5

6.8.4 Radio-Frequency Demodulator................................................... 6-6

6.8.5 Signal Board (DWG 624085) ...................................................... 6-6

6.8.6 Power Supply Board (DWG 624073) .......................................... 6-6

6.8.7 Adapter Board (DWG 624127).................................................... 6-6

6.8.8 Microboard.................................................................................. 6-6

6.8.9 Optional Case Heater Temperature Control Board

(DWG 624003) ............................................................. 6-7

6.8.10 Dual Alarm/Calibration Gas Control Option Board

(DWG 624204) ............................................................. 6-7

6.8.11 Isolated Remote Range I/O Option Board (DWG 624251) ......... 6-7

6.8.12 Auto Zero/Span Option Board (DWG 624599)............................ 6-8

6.8.13 Current Output Option Board (DWG 624092)............................. 6-8

SECTION 7. REPLACEMENT PARTS

7.1 CIRCUIT BOARD REPLACEMENT POLICY............................................ 7-1

7.2 SELECTED REPLACEMENT PARTS...................................................... 7-1

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GENERAL PRECAUTIONS FOR HANDLING & STORING HIGH PRESSURE CYLINDERS
WARRANTY
FIELD SERVICE AND REPAIR FACILITIES

F

IGURES

2-1 Power Supply Board ..............................................................................2-2

2-2 Case Heater Temperature Control Board...............................................2-2

2-3 Rear View of Model 880.........................................................................2-3

2-4 Cable Gland ...........................................................................................2-3

2-5 Calibration Gas Control and Alarm Connections....................................2-8

2-6 Current Output Connections...................................................................2-8

2-7 Auto Zero/Span Connections................................................................2-9

2-8 Remote Input/Output Connections.........................................................2-10

3-1 Model 880 Adjustments..........................................................................3-2

3-2 Model 880 Keypad .................................................................................3-2

3-3 Run Mode Display..................................................................................3-5

3-4 Logic Flow Chart..................................................................................... 3-7

3-5 Accessing the Security Lockout Feature................................................3-9

3-6 Activating/Deactivating the Security Lockout Feature ............................3-9

3-7 Changing the Password.........................................................................3-10

3-8 Setup/Checkout of Range Parameters...................................................3-12

3-9 Analyzer Diagnostics..............................................................................3-13

3-10 Viewing the Zero Display........................................................................3-15

3-11 Changing the Zero Setting......................................................................3-15

3-12 Changing the Zero Setting for Analyzers with Calibration Gas Control..3-16

3-13 Viewing the Span Setting.......................................................................3-16

3-14 Changing the Span Setting.....................................................................3-19

3-15 Changing the Span Setting for Analyzers with Calibration Gas Control.3-20

3-16 Typical Application Linearization Curve..................................................3-22

3-17 User-Determined Linearization Curve....................................................3-22

3-18 Data Points for User-Determined Linearization Coefficients..................3-23

3-19 Setup/Checkout of Linearization Function..............................................3-24

3-20 Setup/Checkout of Alarm Option............................................................3-25

3-21 Status Display ........................................................................................3-26

3-22 Setup/Checkout of Current Output Option .............................................3-27

3-23 Setup/Checkout of Auto Zero/Span Option............................................3-29

3-24 Setup/Checkout of Remote Input/Output Option....................................3-31

4-1 Functional Diagram of Detection System...............................................4-2

5-1 Troubleshooting Chart............................................................................5-5

5-2 Signal Waveforms..................................................................................5-6

5-3 Modulation System.................................................................................5-7

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FIGURES (CONTINUED)

7-1 Case Heater Temperature Control Assembly........................................ 7-2

7-2 Motor/Source Assembly......................................................................... 7-3

7-3 Model 880 Major Components............................................................... 7-4

7-4 Optical Bench Assembly........................................................................ 7-5

7-5 Detector Assembly Removal/Installation ............................................... 7-6

T

ABLES

2-1 PURGING TIME AT ATMOSPHERIC SAMPLE PRESSURE ............... 2-6

3-1 REMOTE RANGE I/O BIT DESIGNATION............................................ 3-32

3-2 REMOTE RANGE I/O BINARY AND DECIMAL BIT CODING .............. 3-32

5-1 ERROR CODE SUMMARY................................................................... 5-1

D

RAWINGS (LOCATED IN REAR OF MANUAL

623782 Schematic Diagram, Microprocessor Board
623995 Schematic Diagram, Oscillator Board
624003 Schematic Diagram, Temperature Controller
624073 Schematic Diagram, Power Supply
624085 Schematic Diagram, Signal Board
624092 Schematic Diagram, Isolated Voltage to Current
624127 Schematic Diagram, Adapter Board
624190 Installation Drawing, Model 880
624191 Pictorial Wiring Diagram, Model 880
624204 Schematic Diagram, Dual Alarm
624251 Schematic Diagram, Isolated Remote Control
624599 Schematic Diagram, Auto Zero/Span Control

)

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SAFETY SUMMARY

To avoid explosion, loss of life, personal injury and damage to this equipment and
on-site property, all personnel authorized to install, operate and service the Model 880
Non-Dispersive Infrared Analyzer should be thoroughly familiar with and strictly follow
the instructions in this manual. Save these instructions.

DANGER is used to indicate the presence of a hazard which will cause severe
personal injury, death, or substantial property damage if the warning is ignored

WARNING is used to indicate the presence of a hazard which can cause severe
personal injury, death, or substantial property damage if the warning is ignored.

CAUTION is used to indicate the presence of a hazard which will or can cause minor
personal injury or property damage if the warning is ignored.

NOTE is used to indicate installation, operation, or maintenance information which is
important but not hazard-related.

WARNING: ELECTRICAL SHOCK HAZARD

Do not operate without doors and covers secure. Servicing requires access to
live parts which can cause death or serious injury. Refer servicing to qualified
personnel.

For safety and proper performance this instrument must be connected to a
properly grounded three-wire source of power.

Alarm and zero/span switching relay contacts wired to separate power sources
must be disconnected before servicing.

This instrument is shipped from the factory set up to operate on 115 VAC, 50/60
Hz electric power. For operation on 230 VAC, 50/60 Hz electrical power, see
Section 2.3 for modifications.

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!

This analyzer is of a type capable of analysis of sample gases which may be
flammable. If used for analysis of such gases the instrument must be protected
by a continuous dilution purge system in accordance with Standard ANSI/NFPA
496-1989, Chapter 8.

If explosive gases are introduced into this analyzer, the sample containment
system must be carefully leak-checked upon installation and before initial
startup, during routine maintenance and any time the integrity of the sample
containment system is broken, to ensure the system is in leak-proof condition.
Leak-check instructions are provided in Section 2.8.

Internal leaks resulting from failure to observe these precautions could result in
an explosion causing death, personal injury or property damage.

WARNING: POSSIBLE EXPLOSION HAZARD

WARNING: PARTS INTEGRITY

!

Tampering or unauthorized substitution of components may adversely affect
safety of this product. Use only factory documented components for repair

!

This instrument’s internal pullout chassis is equipped with a safety stop latch
located on the left side of the chassis.

When extracting the chassis, verify that the safety latch is in its proper (counter­clockwise) orientation.

If access to the rear of the chassis is required, the safety stop may be
overridden by lifting the latch; however, further extraction must be done very
carefully to insure the chassis does not fall out of its enclosure.

If the instrument is located on top of a table or bench near the edge, and the
chassis is extracted, it must be supported to prevent toppling.

!

This analyzer requires periodic calibration with known zero and standard gases.
Refer to Sections 2.6, 3.7, 3.9, 3.10 and 3.11. See also General Precautions for
Handling and Storing High Pressure Cylinders, following Section 7.

CAUTION: TOPPLING HAZARD

CAUTION: HIGH PRESSURE GAS CYLINDERS

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S

PECIFICATIONS

C

ATALOG NUMBERS

191809 Standard Case
191810 Extended Case

POWER REQUIREMENTS:

115/230 VAC ±10%, 50/60 ±3 Hz, 150 W; 350 W with optional case heater

O

PERATING TEMPERATURE

32°F to 113°F (0°C to 45°C)
Some configuration may require optional case heater

DIMENSIONS:

8.7 in (22.0 cm) H x 19 in. (483 mm) W x 19 in. (483 mm) D, standard case

8.7 in (22.0 cm) H x 19 in. (483 mm) W x 24 IN. (610 MM) D, extended case

WEIGHT:

56 lbs (25 kg), standard case
68 lbs (31 kg), extended case

R

EPEATABILITY

1% of fullscale

N

OISE

:

1% of fullscale

1

:

:

:

Z

ERO DRIFT

:

±1% of fullscale per 24 hours

S

PAN DRIFT

:

±1% of fullscale per 24 hours

R

ESPONSE TIME

: (E

LECTRONIC

)

Variable, 90% of fullscale in 0.5 sec to 20 sec, field selectable

S

ENSITIVITY

:

100 ppm fullscale carbon monoxide at atmospheric pressure
50 ppm fullscale carbon dioxide at atmospheric pressure

S

AMPLE CELL LENGTH

:

0.04 in. (1 mm) to 15.0 in. (381 mm)

M

ATERIALS IN CONTACT WITH SAMPLE

W

INDOWS

C

ELLS

T

UBING

F

ITTINGS

O-R

:

INGS

Sapphire, quartz, Irtran

:

Gold plated Pyrex or stainless steel
FEP Teflon

:

316 stainless steel

:

Viton-A

:

:

2

1

Performance specifications based on ambient temperature shifts of less than 20°F (11°C) per hour.

2

Application dependent.

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SPECIFICATIONS (CONTINUED)

SAMPLE PRESSURE:

Max 10 psig (69 kPa), standard
Pressurized application available upon request

A

NALOG OUTPUT

:

Standard: 0 to 5 VDC
Optional: 0 to 20 mA/4 to 20 mA

L

INEARIZATION

:

Keypad entered coefficients for linearizing 1, 2 or all 3 ranges

ENCLOSURE:

General purpose for installation in weather-protected area.
Optional purge kit per Type Z, ANSI/NFPA 496-1989.

3

3

When installed with user-supplied components, meets requirements for Class I, Division 2 locations per National

Electrical Code (ANSI/NFPA 70) for analyzers sampling non-flammable gases. Analyzes sampling flammable gases
must be protected by a continuous dilution purge system in accordance with Standard ANSI/NFPA 496-1989, Chapter 8.
Consult factory for recommendations.

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PECIFICATIONS - OPTIONS

A

LARM

R

ELAY OUTPUTS

Two single point, field programmable high or low, deadband up

:

to 20% of fullscale.
Two form C contacts rated 3A-125/250 VAC or 5A-30 VDC

(resistive)

CAL GAS CONTROL

RELAY OUTPUTS:

Two front panel actuated contact closures
Two form C contacts rated 3 A, 125/250 VAC or 5 A, 30 VDC

(resistive)

A

UTO ZERO/SPAN

RELAY OUTPUTS:

Four contact closures, field programmable frequency and
duration of closure. Two contact closures for indication of
insufficient zero and span adjustment.

Four form C contacts rated 3A-125/250 VAC or 5A-30 VDC
(resistive),

Two form A contact rated (resistive load):
Max switching power: 10 Watts
Max switching voltage: 30 VDC
Max switching current: 0.5 A

REFACE

P

R

EMOTE

I/O

R

ELAY OUTPUTS

I

NPUTS

Three remotely changeable ranges with positive identification.

:

Binary or decimal field selectable.
Eight form A contacts rated (resistive load):

:

Max switching power: 10 Watts
Max switching voltage: 30 VDC
Max switching current: 0.5 A

Eight optical couplers
Input Range: +5 VDC to +24 VDC

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CUSTOMER SERVICE, TECHNICAL ASSISTANCE AND FIELD SERVICE

For order administration, replacement Parts, application assistance, on-site or factory
repair, service or maintenance contract information, contact:

Rosemount Analytical Inc.

Process Analytical Division

Customer Service Center

1-800-433-6076

RETURNING PARTS TO THE FACTORY

Before returning parts, contact the Customer Service Center and request a Returned
Materials Authorization (RMA) number. Please have the following information when
you call: Model Number, Serial Number, and Purchase Order Number or Sales Order

Number.

Prior authorization by the factory must be obtained before returned materials will be
accepted. Unauthorized returns will be returned to the sender, freight collect.

When returning any product or component that has been exposed to a toxic, corrosive
or other hazardous material or used in such a hazardous environment, the user must
attach an appropriate Material Safety Data Sheet (M.S.D.S.) or a written certification
that the material has been decontaminated, disinfected and/or detoxified.

Return to:

Rosemount Analytical Inc.

4125 East La Palma Avenue

Anaheim, California 92807-1802

TRAINING

A comprehensive Factory Training Program of operator and service classes is
available. For a copy of the Current Operator and Service Training Schedule contact
the Technical Services Department at:

Rosemount Analytical Inc.

Phone: [phone]

FAX: [phone]

D

OCUMENTATION

The following Model 880 Non-Dispersive Infrared Analyzer instruction materials are
available. Contact Customer Service or the local representative to order.

P-6

748176 Instruction Manual (this document)

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Q

UICK STARTUP AND TROUBLESHOOTING GUIDE

WARNING: ELECTRICAL SHOCK HAZARD

Do not operate without doors and covers secure. Servicing requires access to live
parts which can cause death or serious injury. Refer servicing to qualified personnel.

The purpose of this guide is to give quick and simplified instructions on getting started.
Some of the non-critical details may have been left out. Refer to the appropriate section in
this manual for complete descriptions of all procedures. Read this guide completely before
starting up the analyzer. This guide contains step-by-step instructions for startup and
includes information helpful in simplifying some procedures detailed in the manual. The
analyzer has been setup and tested at the factory per the specified sales order. Generally
the only settings and adjustments required are calibration gas values, zero/span
calibrations, and adjustments on option boards. Refer to the appropriate section in the
manual for information on option boards.

OW TO USE THIS GUIDE

H

First, read Section 1, Introduction and install analyzer per Section 2 of this manual.
Familiarize yourself with Keypad Operation. Step through Mode Functions. Go to Section
3, Initial Startup and continue (in sequence) through this guide.

CONTENTS

GAS REQUIREMENTS......................................................................................P-8

DISPLAYS ......................................................................................................P-8

FRONT PANEL KEYPAD...................................................................................P-9

MODE FUNCTION ............................................................................................P-10

INITIAL STARTUP..............................................................................................P-10

Range Mode ......................................................................................P-10

Range Number ......................................................................................P-10

Gain=1, 2, 4 or 8......................................................................................P-10

LINEARIZATION MODE.....................................................................................P-12

DIAGNOSTICS MODE.......................................................................................P-12

Osc Tune ......................................................................................P-12

Det Sig (with zero gas flow) .....................................................................P-12

DET SIG (with span gas flow) ..................................................................P-12

SCR CUR ......................................................................................P-12

ZERO CALIBRATION.........................................................................................P-13

SPAN CALIBRATION.........................................................................................P-14

SOURCE BALANCE ADJUSTMENT .................................................................P-14

SOURCE ALIGNMENT ......................................................................................P-15

TROUBLESHOOTING .......................................................................................P-15

TROUBLESHOOTING CHART..........................................................................P-17

COMPONENTS LOCATION...............................................................................P-19

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GAS REQUIREMENTS

Zero - Use a gas containing less than 25% of the measured component, preferably 0%.
Span - Use a gas containing from 51 to 100% of the measured component, for each range.

80 to 100% is recommended. If calibration is attempted with a span gas less than 51% of
the measured component, an error message will be displayed.

DISPLAYS

RUN M

ODE

ZERO M

Concentration, Engineering Units, or % Fullscale.
If Linearization ON, reads in engineer ing units. If
Linearization OFF, reads in % Fullscale.

XXX % ABC L1

XXX ppm ABC L2

XXX %FS ER4 R3

Code for measured component or
Error Message

ODE

ZERO PS=X.X%

ZR=X.X PS=X.X%

Local, or Remote Control, Range 1, 2 or 3.

% of ZERO potentiometer used
(Hardware pot)

P-8

Present RUN Mode value

SPAN M

Rosemount Analytical

ODE

Present RUN Mode value

SPAN PS=X.X%

XXX NN% MMM

% of SPAN potentiometer
used (Hardware pot)

July 1998

% of ZERO potentiometer used
(Hardware pot)

% of SPAN potentiometer used
(Hardware pot)

Calibration Span gas value
entered by user while in RANGE
Mode.
Calibration Gas value displayed
if Linearizer is OFF.

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FRONT PANEL KEYPAD

The following flow diagram describes the basic functions of the f ront panel keypad, starting
in RUN mode. Flow diagrams for other operations are located in this guide and Section 3.

MODE

MODE

Press ENTER to select
the displayed mode.

MAIN MENU SELECTIONS

ZERO

Press SHIFT + ENTER to abort
ZERO and return to RUN mode

ENTER

ZERO

SHIFT

Press or to change
values up or down.

SHIFT

Press and to make large
jumps horizontally from one display to
the next.

ZERO CAL.

ZERO PS=XX%

ENTER

ENTER

ENTER

ZR=X.X PS=XX%

Press ENTER again to calculate
ZERO and return to RUN mode

ENTER

Press to store in permanent
memory the screen values for the
displayed mode.

SHIFT

Press and to return to
RUN mode.

Press or to change
values up or down.

ENTER

SPAN

SPAN

Press SHIFT + ENTER to abort
SPAN and return to RUN mode

SHIFT

RUN Mode

SPAN CAL.

SPAN PS=XX%

ENTER

ENTER

ENTER

RUN Mode

Press or to change
values up or down.

XX.X XX% XX.X

Press ENTER again to calculate SPAN
(software SPAN) and return to RUN mode

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MODE FUNCTION

MODE

SECURITY

RANGE

DIAGNOSTICS

LINEARIZER

ALARM

CURRENTM

AUTO-CAL

Press to enter displayed mode.

Press and to return to RUN mode.

ENTER

SHIFT ENTER

REMOTE IN/OUT

INITIAL STARTUP
RANGE M

As a first step, check range mode settings and enter your calibration gas values. See
Range Mode flow diagram on following page.

ANGE NUMBER

R

Setup desired operating range (1, 2 or 3) using up and down arrow keys. Remember to
press ENTER after changing values to store data.

AIN

G

=1, 2, 4

Don't change from factory setting at this time. If it becomes necessary to make a change
during calibration, use the following table as a guide:

ODE

OR

8

DIGITAL GAIN SETTINGS

DETECTOR SIGNAL (DET SIG) GAIN SETTING

<=7.5 V and >4 V 1
<=4 V and >2.2 V 2
<=2.2 V and >15 V 4
<=1.5 V 8

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P

Note
The detector signal voltages can be observed in the DIAGNOSTICS mode.

Some deviations from these recommended settings are permissible, if the
instrument can't be spanned keeping the %PS reading between 5% and 95%.
Additional information on the gain setting is located in Section 5.7.

MODE

RANGE 1

Set to 1, 2, 4 or 8 (see table

under Digital Gain Settings)

Fullscale range in % or ppm

SECURITY

RANGE

ENTER

RANGE 2 RANGE 3 CMP ABC

SHIFT

GAIN=X

SHIFT

FS=XX % or ppm

SHIFT

ENTER

ENTER

Take %FS value from non-linear

CAL GAS=XXX.X %FS

calibration curve

Zero Gas Offset as a % of
fullscale

Time Constant: 0.5 to 20 sec.

ZR. OFFSET=0.00 %FS

TIME CONST=XX

Move one character at a time. If last character,
moves to next screen.

SHIFT

ENTER

Move one screen at a time.

Press to store, accept

ENTER

SHIFT

ENTER

SHIFT

748176-N

July 1998

Rosemount Analytical

P-11

M

ODEL

880 NON-D

ISPERSIVE INFRARED ANALYZER

LINEARIZATION MODE

Verify that LINEARIZER ON/OFF is in the desired position.
Verify the analyzer coefficients for each range against the values supplied on the factory

calibration sheet in the rear of this manual.

Note
The linearizer range positions 1, 2 and 3 allow setting coefficients for these ranges.

When the operating range is selected from the "Range" mode, the correct
coefficients for that range will be selected regardless of which linearization range
settings (1, 2 or 3) was used in the linearization mode. Linearization position A is an
"ALL" range position, using coefficients from range 3 for all ranges. Position A can
only be used if the range to range ratio is equal to or less than 3:1.

DIAGNOSTICS MODE

If the display is unstable (oscillating) in OSC, TUNE, DET SIG and/or SCR CURRENT,
there probably is an ER4 error message. Refer to the Troubleshooting chart.

OSC TUNE - Tune to 75 to 80% of maximum. Turn counterclockwise from maximum.

DET SIG (

WITH ZERO GAS FLOW

) - Must be between 0.4 to 1.2 volts. If <0.4 volts: Re-

adjust source balance per Section 3.5. If >1.2 volts: See Troubleshooting Chart, Source
Balance and Source Alignment.

DET SIG (

WITH SPAN GAS FLOW

) - Adjust detector signal voltage with GAIN potentiometer

R3 on the Signal Board (see Drawing 624055 in the rear of this manual). For Range 3
(least sensitive) adjust this voltage as close to 7.5 volts as possible. Do not exceed 7.5
volts. Must be between 0.4 to 1.2 volts. For low ppm applications the maximum attainable
voltage may be considerably below 7.5 volts. If span gas is less than 100% fullscale, the
detector voltage should be set roughly equal to (7.5 volts) X (% fullscale read off of the non­linear curve)/100.

Detector signal voltages with span gas flowing will dictate the digital GAIN settings. (see
table under Range Mode, Gain.)

SRC CUR - Adjust Source Current with R9 on the Power Supply Board. Source current
will be between 700 to 950 mA. The source will have a longer life on lower currents.
Current setting will be lower on high concentration, short cell path applications, such as %
level measurements. Will be higher on low concentration, long cell path measurements,
such as 0 to 10 ppm CO2.

P-12

Rosemount Analytical

July 1998

748176-N

REFACE

P

MODE

75 to 80% of maximum.

De-tuned in counterclockwise direction.

0.4 to 1.2 volts with zero gas flow.

1.2 to 7.5 volts with span gas flow.

7.5 volts maximum on highest range.

Must be between 700 and 950 mA.
700 to 800 mA for % to high ppm ranges.
800 to 950 mA for mid to low ppm.

SECURITY

RANGE

DIAGNOSTICS

OSC TUNE

DET SIG

SRC CUR

SHIFT

ENTER

RUN MODE

ENTER

ENTER

ENTER

ENTER

ZERO CALIBRATION

There is one hardware zero for all three ranges, and three software zeros, one for each
range. Once the hardware zero has been adjusted for one of the ranges, IT SHOULD NOT
BE CHANGED when doing software zero on the other two ranges. See flow chart below.

If problems are encountered, such as error messages (ER0, ER1, ER2, ER3 or ER4) go to
DIAGNOSTICS mode to locate the cause of the problem. Use the Troubleshooting chart in
this section, as well as Section 5, Troubleshooting.

ZERO

Using up/down arrow keys, adjust hardware
zero (ZR=X.X) close to zero. Does not
have to be exactly zero.

Calculates software zero, then returns to
RUN mode.

ZERO PS=XX%

ZR=X.X PS=XX%

CALCULATING ZERO

XXX% or ppm ABC L3

RUN MODE

PS stands for % of digital potentiometer used.

ENTER

Limits are 5 to 95%.
Press ENTER before adjusting.

ENTER

Note: Use up/down arrow keys on one range only. Take a software zero on the other ranges.

748176-N

July 1998

Rosemount Analytical

P-13

M

ODEL

880 NON-D

ISPERSIVE INFRARED ANALYZER

SPAN CALIBRATION

There are three hardware spans and three software spans. Use the flow diagram as a
guide.

If problems are encountered, such as error messages (ER0, ER1, ER2, ER3 or ER4) go to
DIAGNOSTICS mode to locate the cause of the problem. Use the Troubleshooting chart in
this section, as well as Section 5, Troubleshooting.

SPAN

XX.X = Actual reading in ppm, % or %FS.
XX% = Percent of span potentiometer.
XX.X = Span gas engineering units or non­linear value taken from curve.

Calculates software zero, then returns to
RUN mode.

See Troubleshooting if error message appears.
SHIFT+ENTER will abort function and return to RUN mode.

OURCE BALANCE ADJUSTMENT

S

SPAN 3 PS=XX%

XX.X XX% XX.X

CALCULATING SPAN

XXX% or ppm ABC L3

RUN MODE

PS stands for % of digital potentiometer used.

ENTER

Limits are 5 to 95%.
Press ENTER before adjusting.

ENTER

Adjust hardware span with up/down arrow keys.
Adjust until actual reading is close to, but less than
non-linear value. Non-linear value must be over 51%
of fullscale and must be <= fullscale range. Up/down
arrow keys can be adjusted for all three ranges before
taking software span.

This procedure should not be necessary on a new analyzer unless problems are
encountered.

1. Access the DET SIG display in DIAGNOSTICS mode.

2. Flow zero gas through the sample cell for a minimum of two minutes.

3. Slightly loosen the hex standoff on the sample cell adjust screw.

4. Rotate the shutter adjust screw until a minimum reading is obtained.

5. Add 0.4 to 0.5 volts to this reading. If this reading exceeds 1.2 volts, a source alignment
is required.

6. Rotate the shutter adjust screw clockwise until the display reads the value obtain in step

5.

7. Re-tighten the hex standoff. Verify that the display does not change.

8. Close analyzer. Allow one hour for analyzer readings to stabilize. If zero gas reading
has changed appreciably, re-balance the analyzer.

P-14

Rosemount Analytical

July 1998

748176-N

REFACE

P

OURCE ALIGNMENT

S

Source balance adjustment must be performed prior to source alignment.
This procedure is necessary when the detector signal is greater than 1.2 volts after step 5 in

the source balance adjustment procedure.

1. Connect a DVM between TP6 and TP2 on the Signal Board.

2. Set the source balance screw halfway in. (1/2 inch of the threads are visible.)

3. Loosen the two screws holding each source in place.

4. Adjust both measurement and reference sources up and down to reach the minimum
detector signal. Tighten screws.

5. Perform source balance adjustment procedure above.

ROUBLESHOOTING

T

If problems are encountered, such as error messages ER0, ER1, ER2, ER3 or ER4, go to
the DIAGNOSTICS mode (page P-12) to assist in locating the cause of the problem.

Use the following Troubleshooting Chart as well as Section 5 Troubleshooting.

SPAN GAS ERRORS ER1, ER2 OR ER3

Check RANGE, CAL GAS, CL GAS

• CAL GAS (Span gas) must be <=FS (fullscale range).

• Span gas must be 51 to 100% of the fullscale range.

• CL GAS must be read off of the non-linear curve.

• The RUN mode concentration reading must be less than the CL GAS value. (See SPAN

Mode Display flow diagram, page P-8)

Note
Spanning with Linearizer ON
If spanning with linearizer ON, RUN MODE values will be in engineering units, and

CAL GAS values will appear in the right-side display.
The microprocessor will be using the non-linear values for the initial stages of

calibration. It may calculate a CAL GAS value that is higher than the entered value.
An error message will be displayed if this occurs.

748176-N

July 1998

Rosemount Analytical

P-15

ODEL

M

880 NON-D

NY OF THE FOLLOWING MAY CORRECT THE PROBLEM

A

ISPERSIVE INFRARED ANALYZER

:

1. Re-check CAL GAS and CL GAS values entered in RANGE mode.

2. Verify that the NON-LINEAR curve is read for CL GAS entry.

3. During hardware span adjust, make the run value lower than the CAL value.

4. Re-calibrate with the linearizer OFF.

RUN M

ODE VALUE TOO LOW DURING HARDWARE

SPAN

ADJUSTMENT

Hardware potentiometer is adjusted to 95% and RUN Mode value still too low;

• Check SPAN GAS bottle for correct concentration and flow

• Check for leaks

• Check DET SIG adjustments

• Check DIGITAL GAIN adjustments

RUN M

ODE VALUE TOO HIGH DURING HARDWARE

SPAN

ADJUSTMENT

Hardware potentiometer is adjusted to 5% and RUN Mode value still higher than CL
or CAL GAS display when software zero taken by pressing ENTER the error
message appears.

• Check SPAN GAS bottle for correct concentration and flow

• Check DET SIG adjustments

• Check DIGITAL GAIN adjustments

P-16

Rosemount Analytical

July 1998

748176-N

REFACE

P

ROUBLESHOOTING CHART

T

Prior to troubleshooting, verify that OSC TUNE (oscillator tune) is properly adjusted. If
reading is oscillating (and can't be correct by OSC TUNE adjustment), check DET SIG and
digital GAIN adjustment.

ZERO
ER0

Run ZERO Calibration (page P-13), re-adjust hardware zero

Are you unable to adjust any further (at PS=5 or 95% limits)?
Have you tried adjusting the RUN mode reading (changing the hardware zero

potentiometer) but are unable to bring the reading close enough to zero?
When ENTER is pressed to calculate software zero, does ER0 error message

appear?

YES

Is DET SIG >1.2 volts? Is DET SIG <0.4 volts?

YES

NO

NO

Check test points with
DVM. Replace boards.

Is application for CO2 and is CO2 range <= 20 ppm @ 1 atmospheric
pressure? (Reads negative, then positive on upscale gas.)

NO

YES

Is CO2 free purge connected and
flowing for reference cell and

NO

source shroud?

Connect CO2 free purge with 10

YES

psig pressure.
Check flow, should be 50 cc/min.

Re-balance Sources

YES

748176-N

Can't get DET SIG below 1.2 V Re-align Sources

YES

July 1998

Rosemount Analytical

P-17

M

ODEL

880 NON-D

ISPERSIVE INFRARED ANALYZER

ER4

Digital error - Generally caused by combination of too high an analog signal for the digital
gain setting used.

Check DET SIG with span gas flowing.

Are readings too unstable to read (oscillating)?

YES

Check both OSC TUNE and SRC
CURRENT in DIAGNOSTICS
mode (page P-12).

Are readings oscillating?

YES

Connect a DVM to TP2 (detector
signal) and TP6 (ground).

Check/adjust analog detector
signal gain, R3 (page P-10)

Re-Zero (page P-8)

NO

Read DET SIG in DIAGNOSTICS
mode (page P-12)

P-18

Re-Span (page P-8)

Rosemount Analytical

July 1998

748176-N

REFACE

P

EADS WRONG WAY ON UPSCALE GAS

R

Reads downscale, then upscale on low flows of upscale gas (the n egative swing might

be missed if flow is too fast)
This is caused by imbalance in reference/measuring energy to detector.

• Check for purge for <= 20 ppm CO2 applications

• Check source balance (page P-14)

OMPONENT LOCATION

C

Display Contrast
Adjust
R8

Reset
SW1

Micro Board

Power Supply

Gain Adjust
R3

Signal Board

Source Current
Adjust
R9

Oscillator Tune

Detector Module

Option
Boards

Motor/Source

Source Balance
Adjust and Locknut

748176-N

July 1998

Rosemount Analytical

P-19

ODEL

M

N

OTES

880 NON-D

ISPERSIVE INFRARED ANALYZER

P-20

Rosemount Analytical

July 1998

748176-N

I

NTRODUCTION

1

1.1 DESCRIPTION

The Model 880 Non-Dispersive Infrared Analyzer is designed to continuously
determine the concentration of a particular component of interest in a flowing gaseous
mixture. Within the analyzer, two equal energy infrared beams are directed through
two parallel optical cells, a flow-through sample cell and a reference cell. The Luft
detector continuously measures the difference in the amount of infrared energy
absorbed within each of the two cells. This difference is a measure of the
concentration of the component of interest in the sample. Readout is on the 16
character, backlit liquid crystal display in parts per million. percent of composition or
percent of fullscale. Additionally, a 0 to +5 VDC output for a potentiometric (voltage)
recorder is provided as standard.

By turning the linearizer ON and entering linearizing coefficients, a calibration curve
may be used to convert display or recorder readings into linearized engineering units.
When this f eature is ON, the analyzer utilizes a linearizing function for linear readout
of concentration values on the display and on a recorder. A diagnostics mode is
provided as standard.

1.2 AVAILABLE OPTIONS

Operation of the Model 880 can be enhanced with the choice of several options:

UAL ALARMS

D

User-set dual alarms are available with configurable HI/LO designations and
deadband.

SOLATED CURRENT OUTPUT

I

For normal usage, the 0 to 20 mA or 4 to 20 mA current output can be set to
represent 0 to 100% of fullscale, or a suppressed range of 25% or more of fullscale
may be selected.

UTO ZERO/SPAN

A

An Automatic Zero/Span is available for unattended calibration of all three ranges.

748176-N

July 1998

Rosemount Analytical

1-1

M

ODEL

880 NON-D

ALIBRATION GAS CONTROL

C

ISPERSIVE INFRARED ANALYZER

A Calibration Gas Control allows two solenoids to be remotely actuated from the front
panel, enabling one-man calibration without leaving the analyzer.

EMOTE RANGE

R

I/O

An optional remote range input/output is available.

ASE HEATER

C

A proportional temperature controller with fan assembly maintains proper operating
temperature inside the case.

URGE KITS

P

An air purge kit, when installed with user-supplied components, meets Type Z
requirements of standard ANSI/NFPA 496-1989 for installation in Class I, Division 2
locations as defined in the National Electrical Code (ANSI/NFPA 70) when sampling
non-flammable gases. If analyzer is used to sample a flammable gases it must be
protected by a continuous dilution purge system per standard ANSI/NFPA 496-1989,
Chapter 8. Consult factory for further information.

1-2

Rosemount Analytical

July 1998

748176-N

U

NPACKING AND INSTALLATION

2

2.1 UNPACKING

Examine the shipping carton carefully. If there are any signs of damage, notify the
carrier immediately. Open the carton and inspect the contents for signs of damage. If
there is concealed damage, save the carton and packing material and notify the
carrier.

2.2 LOCATION

Locate the analyzer in a weather-protected, non-hazardous location away from
vibration. For best results mount the analyzer near the sample stream to minimize
sample-transport time. Refer to Installation Drawing 010-624190.

If equipped with P/N 624446 optional air purge kit and installed with user-provided
components per Instructions 015-748157, the analyzer may be located in a Class I,
Division 2 area as defined by the National Electrical Code (ANSI/NFPA 70). This kit is
designed to provide Type Z protection in accordance with Standard ANSI/NFPA
496-1989, Chapter 2, when sampling nonflammable gases. For flammable samples
the instrument must be equipped with a continuous dilution purge system in
accordance with ANSI/NFPA 496-1989 Chapter 8 or IEC Publication 79-2 (1983)
Section Three. Consult Factory for recommendations on sample flow limitations and
minimum purge flow requirements for your particular application.

2.3 VOLTAGE REQUIREMENTS

WARNING: ELECTRICAL SHOCK HAZARD

For safety and proper performance, this instrument must be connected to a
properly grounded three-wire source of electrical power.

This instrument was shipped from the factory set up to operate on 115 VAC, 50/60 Hz
electric power. For operation on 230 VAC, 50/60 Hz the installer must position voltage
select switches S1 and S2 located on power supply board and switch S3 located on
case temperature heater assembly (optional) to the 230 VAC position (refer to Figures
2-1 and 2-2).

748176-N

July 1998

Rosemount Analytical

2-1

M

G

ODEL

880 NON-D

ISPERSIVE INFRARED ANALYZER

Power consumption is less than 150 watts without optional case heater or 350 watts
with optional case heater.

Set switch windows for v o ltage required

S2 S1

J16

1

115 115

TEMP
CONTROL
CASE

J5

1

R11

S2 S1

230V

115V

DETECTOR

HEATER

J4

1

K1

4 3 2 1

TP1

C12

C11

C9

R12 R13

+

+

C10

+

+

TP2

C6

C8

+

C5

C7

+

R1
R2

S3

SS LUFT

8

1

2

7
6

3

45

+

C4

+

CR4

CR3

CR2

+

C2

+

+

C3

+

+

C1

FAN

J2

1

VR2

VR4

G

O

VR3

I

O

I

I

G

O

VR1

I

G

G

O

R3
R10

R8
R4
R5
R6
R7

AR1

- CR1 +

R9

R37
R34
R35

R36

C14

C13

U1

+

+

C

E

Q3

AR4

C19

J

U2

AR5

CR8

R14

E

C

AK

R21

10

C21

R
38

R17

1

R25
R29
R26

B
Q2
C15

+

R24
R23

Q1

R22

Q4

R19

R15

C20

C16

R31
R30

R27
R28
R32

CR6
CR7

R33
B

CR5

J14

1

J11

J8

1

J15

1

1

J13

F

IGURE

2-1. P

655135 POWER SUPPLY BD

OWER SUPPLY BOARD

SENSOR J18

400A 880 951E

R10 R11 R7 R8

C2

CR1

C

B

Q2

R17R16 R12 CR2

R4

R3

C1

E

+

Q1

K

G

A

TEMP CONTROL BD

1

J7

Heater LED (CR5)

Set switch w in do w fo r volta g e required

S3

POWER
SUPPLY

1

R2R1

R6

C3

AR1

R13

R9 R5

CR3

1

E

B

Q3

TEST

C

J19

J11

R15

POWER
LINE
J5

C4

3 2 1

R14

1

1 2 1 2 3

T.I.F. HEATER

U2

2

3

1

U1

S3

230

115

J17

115

F

IGURE

2-2

2-2. C

ASE HEATER TEMPERATURE CONTROL BOARD

Rosemount Analytical

July 1998

748176-N

NPACKING AND INSTALLATION

U

PURGE GAS

OUTLET

Auto Zero/Span Control Board
Isolated V/I Board
Dual Alarm Board
Isolated Remote Control Board
Calibration Gas Control Board

OPTION BOARDS INSTALLED WITH COMPONENT SIDE TO THE LEFT.

REFERENCE

OUT IN

SAMPLE

OUT IN

OPTIONS CONNECTIONS

RECORDER

OUTPUT POWER

F1 4A
RESETTABLE
CIRCUIT
BREAKER

+ - GND

TB2

PURGE GAS

TB1

GND

NEUT/L2

HOT/L1

Recorder Output
Hook-Up

IN

Power
Hook-UP

F

IGURE

F

IGURE

2-3. R

2-4. C

EAR VIEW OF MODEL

INTERIOR EXTERIOR

N u t G la n d N u t

Cable

ABLE GLAND

880

Case Wall

2.4 ELECTRICAL CONNECTIONS

The power, recorder and option board cable glands are shipped loose in the shipping
kit to allow cable installation to connectors or terminal strips. Route the cable through
the cable gland parts and connect to a connector or terminal strip as shown in Figure
2-4, then tighten the gland.

CABLE GLAND PART NUMBER

P

OWER

899330

R

ECORDER

O

PTION BOARD

Remove the rear cover to access the terminals.

748176-N

899329
899329

July 1998

Rosemount Analytical

2-3

M

ODEL

880 NON-D

ISPERSIVE INFRARED ANALYZER

2.4.1 L

INE POWER CONNECTIONS

If this instrument is located on a bench or table top or is installed in a protected rack,
panel or cabinet, power may be connected to it via a 3-wire flexible power cord,
minimum 18 AWG (max. O.D. 0.480", min. O.D. 0.270") through hole "H" (refer to
Drawing 010-624190) utilizing the connector gland (P/N 899330) provided in the ship
kit. Accessory kits are available which include a 10 foot North American power cord
set plus four enclosure support feet for bench top use (P/N 654008) or the power cord
only (P/N 634061) or the four feet only. If the instrument is permanently mounted in an
open panel or rack, use electrical metal tubing or conduit.

Refer to Figure 2-4. Route the power cable through the cable clamp and connect the
leads to TB1. Tighten the cable clamp after connecting the leads. Since the rear
terminals do not slide out with the chassis. no excess power cable slack is necessary.

2.4.2 R

ECORDER CONNECTIONS

Recorder connections are made to the rear panel. Refer to Drawing 624190. Route
the recorder cable through the cable clamp and connect the end to TB2.

Recorder Interconnection Cable:

Distance recorder to analyzer - maximum 1000 feet (305 meters).
Input impedance - greater than 5000 ohms.
Customer supplied two-conductor shielded cable, 20 AW G min.
Voltage output: 0 to +5 VDC.

2.5 SAMPLE AND REFERENCE INLET/OUTLET CONNECTIONS

The standard Model 880 is intended for atmospheric pressure operation only and
must be vented to atmosphere. Pressurized cells are available for special applications.
Sample inlet and outlet and, when used, flowing reference inlet and outlet connections
are located on the rear panel. All connections are 1/4-inch bulkhead fittings.

2.6 CALIBRATION GAS REQUIREMENTS

Analyzer calibration consists of setting a zero point and one or more upscale points.
All applications require a zero standard gas to set the zero point on the display or

recorder chart. If the factory Calibration and Data Sheet (included with the drawings at
the end of the manual) specifies a background gas, use this as the zero gas. If a
background gas is not specified, use dry nitrogen for the zero gas.

2.7 SAMPLE HANDLING SYSTEM

Many different sample handling systems are available, either assembled completely or
as loose components. The type used depends on the requirements of the particular
application and the preferences of the individual user. Typically, the sample handling

2-4

Rosemount Analytical

July 1998

748176-N

NPACKING AND INSTALLATION

U

system incorporates such components as pumps and valves to permit selection of
sample, zero standard, or upscale standard gas; needle valve in sample-inlet line for
flow adjustment; flowmeter for flow measurement and/or indication of flow stoppage;
and filter(s) to remove particulate matter.

2.8 LEAK TEST PROCEDURE

!

This analyzer is of a type capable of analysis of sample gases which may be
flammable. If used for analysis of such gases, the instrument must be either in
an explosion-proof enclosure suitable for the gas, or protected by a continuous
dilution purge system in accordance with Standard ANSI/NFPA-496-1986
(Chapter 8) or IEC Publication 79-2-1983 (Section Three).

If explosive gases are introduced into this analyzer, the sample containment
system must be carefully leak checked upon installation and before initial
startup, during routine maintenance and any time the integrity of the sample
containment system is broken, to ensure the system is in leak proof condition.

Internal leaks resulting from failure to observe these precautions could result in
an explosion causing death, personal injury or property damage.

The following test is designed for sample pressure up to 10 psig (69 kPa).

1. Supply air or inert gas such as nitrogen at 10 psig (69 kPa) to analyzer via a flow
indicator with a range of 0 to 250 cc/min and set flow rate at 125 cc/min to the
sample inlet.

WARNING: POSSIBLE EXPLOSION HAZARD

2. Seal off with a cap.

3. Use a suitable test liquid such as SNOOP® (P/N 837801) to detect leaks. Cover all
fittings. seals. or possible leak sources.

4. Check for bubbling or foaming which indicates leakage and repair as required. Any
leakage must be corrected before introduction of sample and/or application of
electrical power.

5. If the instrument incorporates a flow-through reference, the above test must be
repeated for that gas system.

Note
Do not allow test liquid to contaminate cells or detector and source windows.

Should this occur, the cells should be cleaned (Section 6.1).

748176-N

July 1998

Rosemount Analytical

2-5

M

ODEL

880 NON-D

ISPERSIVE INFRARED ANALYZER

2.9 SAMPLE FLOW RATE

For best results, the sample flow rate must be in the range of 1 to 2 SCFH (500 to
1000 cc/min). A subnormal flow rate will result in an undesirable time lag. However, an
excessive flow rate will result in cell pressurization.

Assume that two cell volumes are required to flush any cell. Table 2-1 indicates
approximate flushing time at atmospheric sampling pressure, i.e., the outlet of the cell
venting to atmosphere for various cell lengths.

Flushing time is inversely proportional to flow rate.
The primary effect of flow rate, other than flushing time, is cell pressure. Due to the

restriction of the exit tubing, an increasing flow rate increases sample pressure in the
cell. For a 9-inch (232 mm) cell venting to atmosphere, the cell pressure rises from 0
psig (0 kPa) at no flow, essentially linearly, by 1 mm Hg per CFH flow up to at least 20
CFH (10 L/min).

TIME FOR 2

CELL LENGTH
MM INCH

CELL VOLUME IN CC

WITHOUT INLET

TUBE

TOTAL VOLUME IN CC

CELL WITH INLET

TUBE

VOLUMES

AT 2 SCFH (1 L/MIN)

AT 750 MM HG

3 0.118 0.85 12 2 sec.
4 0.157 1.14 12 2 sec.

8 0.315 2.28 13 2 sec.
16 0.630 3.56 16 2 sec.
32 1.25 9.12 20 2 sec.
64 2.52 18.24 25 3 sec.

128 4.03 35.48 44 3 sec.
232 9.13 65.12 73 6 sec.
343 13.50 97.76 105 13 sec.
381 15.00 108.60 116 14 sec.

T

ABLE

2-1. P

URGING TIME AT ATMOSPHERIC SAMPLE PRESSURE

At 7.5 to 8.0 CFH (3.8 to 4 L/min), therefore, the pressure is increased by about 1%,
and the output signal is thereby increased by about the same 1% over static
conditions. In all cases, the effect of pressure on readout is eliminated if the same flow
rate is used for the measured sample as well as for the zero gas and span gas.

Note that at higher flow rates the non-linearity of the calibration curve increases,
because of increase in sample cell pressure. Therefore, if higher flow rates are
required, the calibration curve should be redrawn at the higher rate.

2-6

Rosemount Analytical

July 1998

748176-N

NPACKING AND INSTALLATION

U

At 2 CFH (1 L/min) gaseous sample temperatures are equilibrated to instrument
temperature regardless of stream temperature. At extremely high flow rates, this may
not be true, but no such effect has been noted up to 18 CFH (9 L/min).

2.10 DIFFERENTIAL ANALYSIS WITH FLOW-THROUGH
REFERENCE CELL

In some applications the analyzer is used to measure the difference between the
concentration of the component of interest in two sample streams. If so, the reference
side of the analyzer, as well as the sample side, utilizes a flow-through cell. The
sample cell receives the sample stream, which contains the higher concentration of
the component of interest. The reference cell receives the stream containing the lower
concentration of this component. The flow rate through both cells should be monitored
with a flowmeter and kept the same.

2.11 OPTION BOARDS

The following option boards may be ordered factory installed, or may be ordered as
kits from the factory at a later date: Alarm, Current Output, Calibration Gas Control,
Auto Zero/Span and Remote Range I/O. The boards are equipped with mating plugs
for field wiring attached to the connector at the edge of each board. Attach the cable
(customer supplied) to the plug and socket connector according to the schematic for
each option board.

If an option board has been ordered installed at the factory, this board will be in one of
the five slots inside the rear of the analyzer. Each option will require a cable
(user-provided) which connects to a female plug. The female plug comes attached to
the appropriate terminal block on the option board. If the instrument came equipped
with one option, the interconnect cable will be in place for all options.

The Alarm, Auto Zero/Span, Calibration Gas Control and Remote Range Change
Boards have jumper-selectable addresses (Figures 2-5, 2-7, 2-8 and 2-9).

2.11.1 A

LARM CONNECTIONS

Refer to Drawing 624204 and Figure 2-5. Connect cable (customer supplied) to the
6-pin connector J2. The Dual Alarm Option consists of two form C contacts rated 3A­125/250 VAC or 5A-30 VDC (resistive) .

Run the cable through the cable gland and tighten once attached to connector (Figure
2-4).

This board may be configured to provide any one of three functions:

Fail Safe Alarm - Jumpers E1, E2, E6, E7, E8, E10
Dual Alarm - Jumpers E1, E2, E5, E7, E9, E10
Calibration Gas Control - Jumpers E1, E4, E5, E7, E9, E10.

748176-N

The hook wiring remains the same on each.

July 1998

Rosemount Analytical

2-7

M

ODEL

880 NON-D

ISPERSIVE INFRARED ANALYZER

Outlet
Cable

J2

R5
R4
R3

A

C

K1

624419 CTR L

B B

CAL

E

Q1

FT2FT1

A

E

Q2

C

624207 ALA RM

R7

DUAL

C

B

C

B

E8

E6

K2

E4 E2 E 1

R1
R2
R8
R6

CR1

1

1

CR2

1

E10

E9

E7

1

E5

1

FAIL

654398 SAF E A LAR M

C1

PR1

C1

U1

U2

C3

U3

U4

J1

1

+

Jumper Selectable
Address

Interconnect

R9

Cable

Note: The Dual Alarm, Fail Safe Alarm and Calibration Gas Control use the same board. However, the jumpers
locations are different.

Cal Gas Control: E1, E4, E5 - E7 and E9 - E10
Dual Alarm: E1, E2, E5 - E7 and E9 - E10
Fail Safe Alarm: E1, E2, E6 - E7 and E8 - E10

F

IGURE

2.11.2 C

2-5. C

ALIBRATION GAS CONTROL AND ALARM CONNECTIONS

URRENT OUTPUT OPTION CONNECTIONS

Refer to Drawing 624291 and Figure 2-6. Connect cable (customer supplied) to the
2-pin connector J2. The voltage-to-current board has a fixed address at the top of the
board. Run the cable through the cable gland and tighten once the connector has
been made up (Figure 2-4).

Outlet
Cable

C1 C2

SPAN

R1

OFFSET

R2

+ CR1

J2

1

1

VR1

VR2

AR1

624095 ISOLATED V TO I BD

U3

1

O

G

I

O

G

I

I

C3

1

R6
R5
R4
R3

1

C4 C 5 C 6

U4

U1

U2

C8
+

++

C7

J1

1

Interconnect
Cable

F

IGURE

2-8

2-6. C

URRENT OUTPUT CONNECTIONS

Rosemount Analytical

July 1998

748176-N

NPACKING AND INSTALLATION

U

2.11.3 C

ALIBRATION GAS CONTROL CONNECTIONS

Refer to Drawing 624204 and Figure 2-5. Connect cable (customer supplied) to the
6-pin connector J2. The Calibration Gas Control Option consists of two form C
contacts rated 3A-125/250 VAC or 5A-30 VDC (resistive).

Run the cable through the cable gland and tighten once the connector has been made
up (Figure 2-4).

2.11.4 A

UTO ZERO/SPAN CONNECTIONS

Refer to Drawing 624202 and Figure 2-7. Connect cable (customer supplied) to the
9-pin connectors J2 and 13. The Auto Zero/Span Option consists of four form C
contacts rated 3A-125/250 VAC or 5A-30 VDC (resistive) and two form A contacts
rated at 10 watts maximum switching power, 200 VDC maximum switching voltage
and 0.5 A maximum switching current.

Run the cable through the cable gland and tighten once the connector has been made
up (Figure 2-4).

If installed, this board can also be activated from the keyboard (Zero/Span) for the
selected range.

F

IGURE

Outlet
Cable

2-7. A

FT1 K1

J2

FT2 K2

FT3

J3

C

Q1

CR1

C

Q2

CR2

C

Q1

CR3K3R6

B

E

R4

B

E

R5

B

E

UTO ZERO/SPAN CONNECTIONS

Jumper Selectable
Address

K4FT4

B

B

R8

RP1

E

R10

E

1

U3

U1

C3

1

1

R1R1
R2
R3

1

U2

K6

K5

C

Q5

CR5

C

Q1

C

Q4

CR4

B

E

C1

R7

E4 E2 E1

C2

+

J1

1

Interconnect
Cable

1 U4

748176-N

July 1998

Rosemount Analytical

2-9

M

ODEL

880 NON-D

ISPERSIVE INFRARED ANALYZER

2.11.5 R

EMOTE INPUT/OUTPUT CONNECTIONS

Refer to Drawing 624249 and Figure 2-9. Connect cable (customer supplied) to the
9-pin connectors J2 and J3.

The signal output is at J2 which consists of eight form A contacts rated (resistive load)
10 watts, maximum switching power, 200 VDC maximum switching voltage and 0.5 A
maximum switching current.

The signal input is at J3 which consists of eight opto-couplers, operated from a
user-supplied 24 VDC power source.

Run the cable through the cable gland and tighten once the connector has been made
up (Figure 2-4).

Jumper Selectable
Address

CR1 R13

E4
E2

C5

E1

U1

1

K5

RP2

C4

U7

C3

R12

C1

J1

+

1

Outlet
Cable

J2

E5 E6 E7

R11

R2
R1

E9E8

K1

Interconnect
Cable

F

IGURE

2-9. R

J3

K2

K3

K4

R3
R4
R5
R6

624254 654416 ISOLA TE D R EM O T E C O NT R OL B D

K6

K7

K8

R7
R8
R9

R10

C2

1

11

EMOTE INPUT/OUTPUT CONNECTIONS

1

1

1

U2

U3

U4

RP1

U5U6

2-10

Rosemount Analytical

July 1998

748176-N

NPACKING AND INSTALLATION

U

2.12 ORDERING OPTION KITS

Options not ordered from the factory at the time of purchase may be ordered as the
following kits:

624422 Isolated Remote Control Kit
624423 Dual Alarm Kit
624424 Auto Zero/Span Control Kit
624425 Isolated Current Output Kit
624426 Calibration Gas Control Kit

The option kit consists of the circuit board, a cable gland and two circuit card guides
which press into predrilled holes in the card cage. Mount the option in the board as
shown and follow the wiring directions in section 2.4. There are five connectors on the
interconnect cable. It is important for the slot to be connected to the correct connector
on the interconnect cable.

To install any of the above kits, the Common Parts Kit, P/N 624414, must be ordered.
if not originally ordered with the analyzer. This kit consists of a card cage which
mounts in the rear as shown in Figure 2-3 and three interconnect cables that plug in
as shown on DWG 026-624191. Once this kit is installed, it need not be ordered again
for other kits.

748176-N

July 1998

Rosemount Analytical

2-11

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M

880 NON-D

NOTES

ISPERSIVE INFRARED ANALYZER

2-12

Rosemount Analytical

July 1998

748176-N

I

NITIAL STARTUP AND CALIBRATION

3

Prior to shipment this instrument was subjected to extensive factory performance testing,
during which all necessary optical and electrical adjustments were made. The following
instructions are recommended for initial startup and subsequent standardization of the
analyzer.

3.1 LEAK TEST

Perform the Leak Test Procedure in Section 2.8.

3.2 POWER VERIFICATION

1. Verify power switch settings are for available power (115 VAC/230 VAC). Refer to
Section 2.

2. Apply power. On the Power Supply Board, verify that heater LED (CR5) is ON.
Refer to Figure 2-1 and Drawing 624073.

3.3 SOFTWARE VERSION

When power is first applied to the Model 880 analyzer, the display will read
[INITIALIZING]. Next, the display will show the current software revision number,
[VERSION 2.XX]. This manual is intended only for use with instruments with a
software version of 2.0 or greater.

3.4 FRONT PANEL INDICATORS AND CONTROLS

3.4.1 D

ISPLAY

The display consists of a 16-character, backlighted liquid crystal display. The contrast
on the display may be adjusted so that the display can be read from any vertical
angle. This adjustment is made by loosening the two screws on the front of the case
and sliding the front panel forward (up to 8.2 inches), then turning the potentiometer
(R8) adjust the contrast (Figure 3-1) until the best view of the display is obtained.

In the normal RUN mode of operation, the display will show current process value,
component name, control mode and range. In other modes, relevant information will
be displayed as is necessary.

748176-N

July 1998

Rosemount Analytical

3-1

M

ODEL

880 NON-D

Display Contrast
Adjust
R8

Reset
SW1

ISPERSIVE INFRARED ANALYZER

Isolated Current

Jumper/Test Point

Power Supply

Micro Board

Gain Adjust
R3

Signal Board

Source Current
Adjust
R9

Oscillator Tune

Detector Module

Option
Boards

Motor/Source

Source Balance
Adjust and Locknut

F

IGURE

3.1 M

ODEL

880 A

DJUSTMENTS

ZERO F1

SPAN F2

STATUS MODE SHIFT ENTER

Rosemount Analytical

F

IGURE

3-2

3-2. M

Rosemount Analytical

ODEL

880 K

July 1998

EYPAD

748176-N

NITIAL STARTUP AND CALIBRATION

I

3.4.2 F

UNCTION KEYS

The Model 880 has twelve function keys (Figure 3-2). Each key must be pressed
firmly to insure that the microprocessor recognizes the keystroke. The definitions for
these keys are as follows:

ZERO

SPAN

STAT US

SHIFT

To activate the manual zero calibration of the analyzer.

To activate the manual span calibration of the analyzer.

To display the configuration and the status of alarms and error messages.

Used in conjunction with left and right or up and down arrows, F1, F2 and
ENTER keys. Pressing the SHIFT key in any display except Run Mode, Zero

Setting, Span Setting and Status causes a ↑ to be displayed at the far right
hand position. Pressing → will then move the cursor 16 characters to the right,
pressing ← will move the cursor 16 characters to the left, and, if a displayed
parameter is being modified, pressing ↑ will access the highest value allowed for
that parameter and pressing ↓ will access the lowest value allowed for that
parameter.

Software programmable keys for quick access to mode functions.

F1

F2

When used in conjunction with the SHIFT key, two additional functions

are available: SHIFT/F1 and SHIFT/F2. The computer acknowledges
the keystrokes by flashing [** KEY SAVED **] on the display. These four functions can
immediately access a particular display for the following modes: Range, Diagnostics,
Linearization, Alarm, Current Output, Auto Zero/Span or Remote Range I/O.

MODE

To display instrument functions. The standard functions are security, range,
diagnostics, and linearization. Additional functions (in conjunction with option
boards) are Auto Zero/Span, Remote Range I/O, Current Output, and Alarm.

The up and down arrow keys are used to modify the data in the

display. Press either the up or down arrow to change the values

displayed. When used in one of the editing modes, pressing SHIFT
↑ will display the highest value allowed in a fu nction. Pressin g SHIFT ↓ will display
the lowest value. In the zero and span calibrations, these keys will display the highest
and lowest potentiometer settings.

Press the arrow key once to change one digit; press and hold either key to scroll
(continuous value change), thereby reducing the time required to make large value
changes.

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880 NON-D

ISPERSIVE INFRARED ANALYZER

To move cursor one position at a time or, when used in conjunction
with the SHIFT key moves the cursor 16 characters, one full display,
at a time.

To access a function, to store a value in nonvolatile memory or to return to run

ENTER

mode from span, zero and security screens. The computer acknowledges

ENTER by momentarily flashing [** DATA STORED **] on the display when
display when used to store a setting in non-volatile memory. Use ENTER to engage
the span and zero functions, which are initiated by the SPAN and ZERO keys.
[CALCULATING SPAN] or [CALCULATING ZERO] will then be momentarily
displayed. Instruments with the Calibration Gas Control option or Auto Zero/Span
option, ENTER also turns ON and OFF a solenoid valve for zero and span gas.

SHIFT ENTER

Mode. In the event of a power outage, items placed in volatile memory

will be lost. First press the SHIFT key, followed by the ENTER key.
SHIFT+ENTER does not shut off the solenoid valve for instruments with the
Calibration Gas Control or Auto Zero/Span.

The SHIFT+ENTER combination is the Escape feature.

The ENTER key in conjunction with the SHIFT key will return to Run

3.4.3 U

SER-PROGRAMMABLE KEYS

F1, F2, SHIFT/F1 and SHIFT/F2 are software-programmable keys which can be
user-programmed to access any frequently used display or sub-menu for the following
modes: Range, Diagnostics, Linearization, Auto Zero/Span, Remote Range I/O or
Alarm, provided the option board selected is still present.

To use this feature, the function keys must be preprogrammed by the user through the
following steps:

1. Access a display or sub-menu that will be frequently used.

2. Access a display or submenu by following the steps in the particular set of

instructions given in Figures 3-7 through 3-24 until the desired display is obtained.

3. Press F1, F2, SHIFT/F1 or SHIFT/F2 to program the analyzer to return to this

display from the RUN mode. This will assign F1, F2, SHIFT/F1 or SHIFT/F2 to this
particular display, and will retain those assignments until the key or combination of
keys is reprogrammed using the same procedure described in this section. The
analyzer acknowledges this command by flashing [**KEY SAVED**] on the display.

4. Exit to the RUN mode display by completing the remaining steps in the figure

chosen in Step 2.

5. When the analyzer returns to the RUN mode display, press the key or keys

selected in Step 3 (F1, F2, SHIFT/F1 or SHIFT/F2) to check the setup. The
analyzer will return to the display or sub-menu selected in Step 1.

3-4

Rosemount Analytical

July 1998

748176-N

NITIAL STARTUP AND CALIBRATION

I

6. Press SHIFT+ENTER to return to the RUN mode.
To reprogram the key or keys selected in Step 2, repeat Steps 1 through 5 for another

display or sub-menu.
For example, if the GAIN is frequently changed, access the RANGE sub-menu to

access the GAIN display and press the F1 key. Press SHIFT+ENTER to return to the
RUN mode. To get to the GAIN display from the RUN mode display, press the F1 key.
To reprogram the F1 key, go to another display other than the RUN mode display and
press the F1 key. This will reprogram the F1 key to the new display.

3.4.4 R

UN MODE DISPLAY

The RUN mode is the normal mode of operation. In this mode the display will show
current process value component designation, control mode and range. Should an
error condition or an alarm condition occur, [ER?] (where ? is an alphanumeric
character) or [AL#] (where # is either the num ber 1 or 2) will flash on the display in the
component name location. A list of error messages is located in Section 5.1. Refer to
Figure 3-3 for the different run mode displays.

XXX % ABC L1

XXX ppm ABC L2

XXX %FS ER4 R3

Concentration
Engineering Unit s ,
or % Fullscale. If
Linear ization ON,
reads in
engineer i ng uni t s.
If Linearization
OFF, reads in %
Fullscale.

Code for
measured
component or
Error Message

Local, or Rem ote
Control, Range 1, 2
or 3.

F

IGURE

3.4.5 G

3-3. R

UN MODE DISPLAY

ENERAL DISPLAY INFORMATION

The following features are present to the right of all display sequences:

→→→→

The beginning of a sub-menu is indicated by → in the extreme right position of
the display. This arrow indicates that there will be more information in subsequent
displays which can be obtained by either pressing the → key until the next display is
obtained, or pressing SHIFT → to move 16 characters, one full display, at a time.

748176-N

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Rosemount Analytical

3-5

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880 NON-D

ISPERSIVE INFRARED ANALYZER

* Indicates that there are subsequent displays which can be accessed by pressing
the → key to view a new display or the ← key to return to a previous display. To
move 16 characters, one full display at a time, press SHIFT → or SHIFT ←.

←←←←

The last display of a routine is indicated by the ← To return to other d isplays
in the routine, press the → key or SHIFT ← to move 16 characters, one full display
at a time.

Note:
At any point in the sequence, a sub-menu may be exited by pressing

SHIFT+ENTER.

3.5 ACCESSING MODE DISPLAYS

Ensure that all MODE displays are functional and that all options ordered from the
factory are present by following the flow chart in Figure 3-4. To follow the logic flow
chart, use the following steps:

Note:
For more detailed instructions, refer to Figures 3-7 through 3-24.

1. Press MODE.

2. Use the → key to move to the desired sub-menu (SECURITY, RANGE, DIAG-

NOSTICS, LINEARIZER, ALARM, CUR-RENT OUT PUT, AUTO-CAL or REMOTE
I/O) and press ENTER.

3. Press SHIFT then → to move through each sub-menu.

4. At the end of each routine, press SHIFT+ENTER to return to the RUN mode.

5. Repeat steps 1 through 4 to check the next function.

3.6 SECURITY CODE

The Model 880 is equipped with a security code feature, which is deactivated when
the instrument is shipped from the factory. When the security feature is activated,
only the STATUS and MODE function keys are active to access the STATUS and
SECURITY displays. A valid password must be entered to activate the rest of the
keyboard.

INITIAL PASSWORD IS “880”

This password may be changed to any three character group as shown in Figure 3-7.
Entering the correct password activates the keyboard.

To gain access, follow the steps in the appropriate figure in this section. Once access
has been gained, the procedure described in Sections 3.6 through 3.16 may be
performed.

3-6

Rosemount Analytical

July 1998

748176-N

NITIAL STARTUP AND CALIBRATION

I

In the event the password is misplaced, the operator may return to the initial password
(880) through the following steps:

1. Press and release the RESET push-button switch on the Micro Board (see Figure
3-1).

2. Press and hold the ENTER key until the RUN mode display appears.

IR-880 VER. 2.0

ZERO

ZERO PS=30%
ZR=0.0 PS-30%
NOTE: Shift-enter from screen #2 leaves

valve on Time Constant = 1 sec.

SPAN

STATUS

SPAN PS=57%

98.5 57% 100.0
NOTE: Shift-enter from screen #2 leaves valve

on Time Constant = 1 sec.

SECURITY ENABLED/DISABLED
EO-ZERO POT LMTS
EI-SPAN #1 LMTS
E2-SPAN #2 LMTS
E3-SPAN #3 LMTS
E4-ADC SATURATED
E5-ZERO DRIFT
E6-SPAN DRIFT
ALARM 1 MN ON/OFF
ALARM 2 AT
RMT L/R BIN/DEC
CURRENT 4/0 SP ON/OFF
AUTOCAL ON/OFF

F

IGURE

748176-N

3-4. L

MODE

(continue to Figure 3-4B)

OGIC FLOW CHART (CONTINUED ON NEXT PAGE

July 1998

)

Rosemount Analytical

3-7

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880 NON-D

MODE

ISPERSIVE INFRARED ANALYZER

SECURITY

PASSWORD: ??
SECURITY: ON/OFF
NEW PSWRD: ???
Note: <reset> button plus <enter>
disables security and sets password
to "880"

DIAGNOSTICS

DIAG: OSC.T.=96
DET.SIG.=0.57
SCR.CUR.=825mA
+5V=5.1
+15V=15.0
+12V=11.9

-15V+14.9

ALARM

ALARM: 1 MAN OFF/ON
RANGE: 1 /2,3
LOW SET: 500 /HIGH
DEADBAND: 10%
ALARM: 2 AUTO /MAN
RANGE: 1 /2,3
HIGH SET: 4500 /LOW
DEADBAND: 5%
Note: Each alarm can be set to
different range; only one range per
alarm. The value for the setpoint
can be in ppm, % or %FS dependent
on the selected range. The
deadband value is in % of the
selected range.

CUR. OUTPUT

CURRENT: 4 20mA /0
ZR/SPN SUPR ON /OFF
25 TO 75 %FS
Note: SPN SUPR - ZR SUPR must be
>= to 25 %FS

RANGE

RANGE: 1 CMP CO2 /2.3
GAIN = 1 /2, 4, 8
FS = 5000 ppm /%
CAL GAS = 5000 ppm /%
CL GAS = 100.0 % FS
ZR-OFST 0.00 %FS (only)
TIME CONST = 2 /ln SEC.
Note: Zero offset works for both linearizer "ON"
and linearizer "OFF".

LINEARIZER

LIN:ON/OFF RANGE 1,2,3
AO=0.0000000
A1=1.0000000
A2=0.0000000
A3=0.0000000
A4=0.0000000
Note: Range A, linearizer coefficients from A are
equal to Range 3 and used for all three ranges.
Maximum dynamic range 3:1. Coefficient
accuracy=5 digits. Changing the linearizer ranges
resets the drift capture, flag.

AUTO-CAL

AUTO-CAL: ON /OFF
SH-V:Y SH-I:N
RANGE: 1Y 2Y 3N
DELAY: 1 HR
PURGE: 2 MIN
RPT ZERO: 24 HR
RPT SPAN: 48 HR
DRIFT LIMIT: OFF /ON
ZR-DFT: ±±±±10 %FS
SP-DFT: R1 ±±±±12 %FS
Note: Switching DRIFT-LIMIT from OFF to ON
enables the drift check and causes an alarm if the
limit is reached. The starting point is the first
Auto-Cal sequence after Drift-Limit is switched
from OFF to ON. Remote request for ACAL is only
valid when ACAL is set to OFF. Changing state of
any of the ranges enables resets the Drift capture
flag if drift is enabled.

F

IGURE

3-8

REMOTE I/O

LOCAL/REMOTE: R /I
IN/OUT: DEC/BIN
Note: IN/OUT (Bin/Bin) (Dec/Dec) (Bin/Dec) (Dec/Bin) (SP) special BIT­6 (I/O) for ACAL request for status. BIT-7 (0) for RHT/LOCAL status.
In SP mode BIT-7 (0) is to switch the power voltage. When set to
"special" BITS 0-5 are suppressed; BITS 6 & 7 are output as usual.

3-4. L

Rosemount Analytical

OGIC FLOW CHART (CONTINUED FROM PREVIOUS PAGE

July 1998

)

748176-N

NITIAL STARTUP AND CALIBRATION

I

STEP

1MODE

2ENTER

3ENTER

4

KEYBOARD

ENTRY

DIGITAL DISPLAY EXPLANATION

Pressing the MODE key accesses the security
feature. If the security feature is activated as
indicated by ← at the right of the display,

SECURITY →

PASSWORD: ??? →

PASSWORD VALID

(or)

INVALID PASSWORD

X.X %FS CH4 L1
XXXX ppm CH4 L1
X.X % CH4 L1

continue with Step 2. If the security feature is
not activated as indicated by the → at the right
of the display, use the → to access the other
functions in Figures 3-7 through 3-24.

Pressing ENTER accesses the PASSWORD
display. ← at the right of the display indicates
that the security feature is activated. Use the ↑
or ↓ k ey to enter the first pass word character.
Use the → key to move the cursor to the next
position and enter the next character. Repeat
for the third character.

Pressing ENTER completes the authorization
sequence, displays whether the password is
valid or invalid and returns the analyzer to the
run mode. If the password is valid, the user may
now access the other analyzer functions in
Figures 3-7 through 3-24.

This is the RUN mode. One of these three
displays will be present on the digital display.

F

IGURE

STEP

F

IGURE

3-5. A

1MODE

2ENTER

3

4 ENTER **DATA STORED**

5 SHIFT+ENTER

→

3-6. A

CCESSING THE SECURITY LOCKOUT FEATURE

KEYBOARD

ENTRY

DIGITAL DISPLAY EXPLANATION

SECURITY →

PASSWORD: ??? →

SECURITY: ON *

X.X %FS CH4 L1
XXXX ppm CH4 L1
X.X % CH4 L1

CTIVATING/DEACTIVATING THE SECURITY LOCKOUT FEATURE

Pressing the MODE key accesses the security
feature.

Pressing ENTER accesses the password
display. If the security feature is engaged, as
indicated by ← at the right of the display, enter
the password as in Figure 3-5, then repeat step

1.
Use the ↑ or ↓ key to toggle SECURITY

ON/OFF. To activate the security feature,
toggle SECURITY ON.

Pressing ENTER stores the data in non-volatile
memory.

Pressing SHIFT+ENTER returns the user to the
RUN mode.

748176-N

July 1998

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3-9

M

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880 NON-D

ISPERSIVE INFRARED ANALYZER

STEP

1MODE

2ENTER

3

4

5 ENTER PSWRD IS NOW ABC

KEYBOARD

ENTRY

→

→ NEW PSWRD: ??? ←

DIGITAL DISPLAY EXPLANATION

SECURITY →

PASSWORD: ??? →

SECURITY: OFF *

X.X %FS CH4 L1
XXXX ppm CH4 L1
X.X % CH4 L1

Pressing the MODE key accesses the security
feature.

Pressing ENTER accesses the password
display. If the security feature is OFF
(PASSWORD: ??? →), use the → to move to
the next display.

If the security feature is ON, as indicated by ←
at the right of the display, enter the password as
in Figure 3-5, then proceed to step 3.

Use the → to move to the next display.
A new password may be entered in the NEW

PSWRD: ??? display. Use the ↑ or ↓ key to
change the first character. Use the → key to
move the cursor to the next position and change
the second and third characters. Valid
characters are "space", "0 ... 9" and "A ... Z".

Pressing ENTER stores the new password in
non-volatile memory and returns the analyzer to
RUN mode.

This is the RUN mode. One of these three
displays will be present on the digital display.

F

IGURE

3-7. C

HANGING THE PASSWORD

3.7 RANGE PARAMETERS

There are several range parameters that may be changed. The first display [RANGE:#
CMP NNN →] allows RANGE1, RANGE2 or RANGE3 to be selected with the ↑ or ↓
key. Of these three independent ranges, RANGE3 should always be the least
sensitive range.

The Model 880 Analyzer allows a different set of linearizing coefficients (Section 3.13)
to be entered for each range. Or, if desired, one set of linearizing coefficients may be
used for all three ranges when the dynamic range ratio is 3:1 or less. When using one
set of coefficients, this set should always be entered in Range 3. Coefficients placed
in Range 3 will automatically be used for Range A (All).

The component of interest is designated by a three digit group of letters or numbers.
This gas name or designation may be selected for each range by placing the cursor
under the desired digit [NNN] and selecting a letter or number with the ↑ or ↓ key.
Valid characters are "space", "0"..."9" and "A"..."Z". This name will appear on the
display when the analyzer is in the run mode.

3-10

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748176-N

NITIAL STARTUP AND CALIBRATION

I

On the [GAIN=X] display, an amplifier gain of 1, 2, 4 or 8 can be selected for each
range with the ↑ or ↓ key depending on the sensitivity desired. Refer to Sections 5.7
and 5.10. Range 3 is normally the least sensitive range. Other ranges are generally
set with gains that are proportional to their relative fullscale spans. Thus, if range 1 is
0 to 10 % CO and range 3 is 0 to 100 % CO, then the respective gains will usually be
8 and 1.

On the [F S=XXXX pp m * ] or [FS= XX.X % *] dis play, u p to a fo ur digit f ulls cale va lue is
entered in ppm (parts per million) or % (percent) for each linearized range.

On the [CAL GAS=XXXX ppm *] or [CAL GAS=XX.X % *] display, up to a f our digit
calibration gas value is entered in ppm or % (percent) for each linearized range. Each

calibration gas concentration must be between 75 to 100 % of fullscale.
On the [CL GAS=XXX.X%FS] display, the calibration gas in percent fullscale is

entered for each range. This value is obtained from the non-linear Response

Curve for Each Range located at the back of the manual. This curve will be different
for each different application. Locate the calibration gas value on the bottom scale and
find the corresponding non-linearized Recorder Deflection value on the side scale.
This is the value that should be entered in [CL GAS=XXX.X%FS].

On the [ZR-OFFSET:X.XX *] display, the amount of zero offset in percent of fullscale
is entered for each range. The zero offset feature compensates for impurities in zero
calibration gas. If there are no impurities in the zero gas, set ZR-OFFSET to 0.00.
Otherwise, the value should be obtained from the Response Curve for Each Range
located at the back of the manual. Locate the amount of zero offset desired on the
bottom scale and find the corresponding Recorder Deflection value on the side scale.
This is the value that should be entered in [ZR-OFFSET:X.XX *].

On the [TIME CONST=XX ←] display, the value of the TIME CONSTANT can be
changed for each range. This TIME CONSTANT is responsible for the amount of time
(in seconds) in which the analyzer responds to change. A different TIME CONSTANT
can be selected for each range.

To change or check the settings of the different range parameters, press the keys in
the following sequence:

Note
After changing a setting, press ENTER to retain the new setting in

nonvolatile memory. Should a power outage occur, settings stored in
nonvolatile memory will be saved.

At any point in the sequence, the routine may be exited by pressing
SHIFT+ENTER.

The analyzer must be in local mode (L1, L2 or L3 will show in the run mode
display) to change ranges in STEP 3 of Figure 3-8.

748176-N

July 1998

Rosemount Analytical

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ODEL

880 NON-D

ISPERSIVE INFRARED ANALYZER

STEP

1MODE
2

3ENTER

4

5

6

7

8

9

10 SHIFT+ENTER

KEYBOARD

ENTRY

→

→

→

→

→

→

→ TIME CONST=XX←

DIGITAL DISPLAY EXPLANATION

SECURITY →
RANGE

RANGE=1 CMP CO →

GAIN=X

FS=XXX.X %
FS=XXXX ppm

CAL GAS=XXXX ppm

CL GAS=XXX.X%FS

ZR-OFFSET: X.XX

X.X %FS CH4 L1
XXXX ppm CH4 L1
X.X % CH4 L1

Pressing the MODE key accesses the security
feature.

Use the → to move to the next display.
Pressing ENTER allows the range parameters

to be changed or viewed. Range 1, 2, or 3 can
be selected with the ↑ or ↓ keys. Use the → key
to move the cursor to the c omponent of interest
section of the display. Use the ↑ or ↓ keys to
enter up to three characters. Store any changes
made in non-volatile memory by pressing
ENTER.

Use the ↑ or ↓ keys to select a GAIN of 1, 2, 4,
or 8. Store the new GAIN setting in non-volatile
memory for the selected range by pressing
ENTER.

XXXX is fullscale value in ppm or %. This value
may be changed by moving the cursor to a digit
with the → and using the ↑ or ↓ keys to obtain
the desired value. In the linear mode, ppm can
be toggled with % with the ↑ or ↓ keys,
depending on the engineering units to be used
in the RUN mode. Store the new fullscale value
in non-volatile memory by pressing ENTER.

XXXX is the calibration gas value in ppm or %.
This value may be changed by moving the
cursor to a digit with the → key and using the ↑
or ↓ keys to obtain the desired value. Store the
new calibration gas value (in % fullscale) in non­volatile memory by pressing ENTER.

XXX.XX% is the amount of non-linearized
recorder deflection f or the calibration gas value
on the Response Curve at the back of the
manual. Use the ↑ or ↓ keys to obtain the
desired value. Store the new value (in %
fullscale) in non-volatile memory by pressing
ENTER.

Use the ↑ or ↓ keys to select the amount of zero
offset.

Us the ↑ or ↓ keys to change the TIME
CONSTANT to a value between 0.5 and 20
seconds. Store the new TIME CONSTANT
setting in non-volatile memory by pressing
ENTER.

Pressing SHIFT+ENTER returns the analyzer to
RUN mode. One of these three dis plays will be
present on the digital display.

F

IGURE

3-12

3-8. S

Rosemount Analytical

ETUP/CHECKOUT OF RANGE PARAMETERS

July 1998

748176-N

NITIAL STARTUP AND CALIBRATION

I

3.8 ANALYZER DIAGNOSTICS

Diagnostics is selectable through the mode function. This function allows the oscillator
tune, detector signal. source current and four power supply values to be viewed. It is
recommended that the values for oscillator tune, detector signal and source current be
recorded when the diagnostic display is first accessed.

STEP

1MODE
2

3

4ENTER

5

6

7
8
9

10
11 SHIFT+ENTER X.X %FS CO2 L1

KEYBOARD

ENTRY

→
→

→

→

→
→
→
→ -15V=XX.X←

DIGITAL DISPLAY EXPLANATION

SECURITY →
RANGE

DIAGNOSTICS

DIAG:OSC.T.=XXX→

DET. SIG.=X.XX

SRC.CUR.=XXXXmA

+5V=X.X A power supply voltage.
+15V=XX.X A power supply voltage.
+12V=XX.X A power supply voltage

Pressing the MODE key accesses the security
feature.

Use the → to move to the next display.
Press → to move to the next display.
Pressing ENTER allows the analyzer diagnostic

displays to be viewed. This display gives the
current oscillator tune reading. The value may
be changed by making a hardware adjustment
(Section 5.2).

DET. SIG. is the detector s ignal value in volts.
The value may be changed by making a
hardware adjustment (Section 5.4).

SRC CUR is the value of the source current in
milliamps. The value may be changed by
making a hardware adjustment (Section 5.5).

A power supply voltage
Pressing SHIFT+ENTER returns the analyzer to

RUN mode.

F

IGURE

3-9. A

NALYZER DIAGNOSTICS

3.9 ZERO CALIBRATION

3.9.1 H

748176-N

ARDWARE AND SOFTWARE ZERO

The Model 880 Analyzer has both a hardware and a software zero. The hardware zero
is the adjustment of the zero potentiometer with the up and down arrows when the
analyzer is in the zero setpoint mode. Using the up and down arrows adjusts the
percentage of the zero potentiometer currently being used. The zero potentiometer
should be adjusted so that the zero value [ZR=X.X] in the zero display [ZR=X.X
PS=XX% →] is as close as possible to absolute zero while keeping the potentiometer
status [PS=XX%] between 5% and 95%. Values outside this range will not be
accepted.

July 1998

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Note
There is only one hardware zero for all three ranges. However, there are

three software zeros, one for each range. When the hardware zero is
engaged, the amplifier GAIN is automatically set to one and the TIME
CONSTANT is set to one second. Engaging the software zero resets the
GAIN and TIME CONSTANT to the values selected in Range Parameters
(Figures 3.8, Step 9).

Pressing the up or down arrow sets the present value of the software zero to absolute
zero. Pressing ENTER after the hardware zero has been set, engages the software
zero. The analyzer can use up to ±500 mV to compensate for the hardware zero. In
the run mode, the analyzer will now read zero. This new zero value set by software will
be used as zero for the range in which it was calibrated until the analyzer is
recalibrated.

While there is only one hardware zero for all three ranges, there are three software
zeros. When calibrating more than one range, after the hardware and software zero
has been set for the first range, the operator should select a second range that will be
used and re-enter the zero mode. Pressing ENTER twice while flowing zero gas
without making a potentiometer adjustment will complete a software zero for the
second range. This step should be repeated for the third range, should this range be
used.

Note
When entering this function, make sure that there is zero calibration gas

flowing through the analyzer. When entering this function for viewing
purposes only, press SHIFT+ENTER to exit. Press ENTER to exit the
function only if a calibration has been made.

Note
If the zero potentiometer has been changed, pressing SHIFT+ENTER

instead of ENTER will leave the software zero set to absolute zero. This will
cause the analyzer to give faulty readings unless the hardware zero gives
an absolute zero reading.

3.9.2 C

ALIBRATING THE ANALYZER WITH ZERO GAS

1. Allow system to warm up a minimum of one and one half hours.

2. Connect zero gas to the sample cell inlet at the back of the analyzer. Flow the gas
at a flow rate of 500 cc/min, as read on a flowmeter, through the analyzer for at
least two minutes.

3. Press the keys in the following sequence to calibrate the zero setting for the
analyzer for each range desired.

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NITIAL STARTUP AND CALIBRATION

I

STEP

1 ZERO ZERO PS=XX%

2 SHIFT+ENTER

3

F

IGURE

STEP

1NONE

2 ZERO ZERO PS=XX%

3 ENTER ZR=X.X PS=XX%

4ENTER

KEYBOARD

ENTRY

3-10. V

KEYBOARD

ENTRY

DIGITAL DISPLAY EXPLANATION

X.X % CO2 L2
XXXX ppm CO2 L2
X.X %FS CO2 L2

X.X % CO2 L2
XXXX ppm CO2 L2
X.X %FS CO2 L2

IEWING THE ZERO DISPLAY

DIGITAL DISPLAY EXPLANATION

X.X % CO2 L2
XXXX ppm CO2 L2
X.X %FS CO2 L2

CALCULATING ZERO
X.X % CO2 L2

XXXX ppm CO2 L2
X.X %FS CO2 L2

then

ZERO indicates that the instrument is in the zero
setting mode. PS=XX% is the zero potentiometer
status. XX is the percent of the zero potentiometer
being used. → indicates beginning of routine.

SHIFT+ENTER returns the analyzer to the RUN
mode without engaging the software or hardware
zero. To avoid un -calibrating th e analyzer, do not

use the ENTER key to exit this function u nless a
change has been made.

To make a c hange in the zero setting, go to Figure 3­11 for the standard analyzer. Figure 3-12 for the
analyzer with Calibration Gas Control or Figure 3-23
for the analyzer with Auto Zero/Span option.

This is the RUN mode display. Verify that zero
calibration gas is connected to the rear of the
analyzer and turn the gas ON.

Zero indicates that the analyzer is in the zero setting
mode. PS=XX% is the zero potentiometer status.
This is the percent of the zero potentiometer being
used.

Pressing ENTER sets the gain amplification to one,
bypasses the linearizer if this feature is ON and
allows the zero setting to be changed. ZR=X.X is the
present numeric value of the zero signal in %FS for
the non-linear mode. The next two digits ar e the zero
potentiometer status. Use the ↑ or ↓ key to change
the zero potentiometer (PS=XX%) and set the zero
signal (ZR=X.X) as close to absolute zero as
possible. The first time the ↑ or ↓ k ey is pressed, the
software zero is set to absolute zero. Subsequent
moves change the setting of the zero potentiometer .
Valid settings for the zero potentiometer are between
5% and 95%.

Pressing ENTER when the desired value has been
obtained to exit the functions changes the GAIN to
the value set in the range parameters (Figure 3-8,
Step 4), engages the linearizer if this f eature is ON,
engages the software zero, stores the new zero value
in non-volatile memory and returns the analyzer to
the RUN mode.

F

IGURE

748176-N

3-11. C

HANGE THE ZERO SETTING

July 1998

Rosemount Analytical

3-15

M

ODEL

880 NON-D

ISPERSIVE INFRARED ANALYZER

STEP

KEYBOARD

ENTRY

1NONE

2 ZERO ZERO PS=XX%

3 ENTER ZR=X.X PS=XX%

4ENTER

DIGITAL DISPLAY EXPLANATION

X.X % H2O L1
XXXX ppm H2O L1
X.X %FS H2O L1

CALCULATING ZERO

then
X.X % H2O L1
XXXX ppm H2O L1
X.X %FS H2O L1

This is the RUN mode display. Verify that zero calibration
gas is connected to the rear of the analyzer and turn the gas
ON.

Zero indicates that the analyzer is in the zero setting mode.
PS=XX% is the zero potentiometer status. This is the
percent of the zero potentiometer being used.

Pressing ENTER turns ON the solenoid valve (customer
supplied) for zero calibration gas, sets the GAIN
amplification to one, bypasses the linearizer if this f eature is
ON, and allows the zero setting to be changed. Allow the
zero gas to flow for two minutes before proceeding with the
rest of the calibration. ZR=X.X is the pres ent num eric value
of the zero signal in %FS. The next two digits are the zero
potentiometer status. Use the ↑ or ↓ key to change the zero
potentiometer (PS=XX%) and set the zero signal (ZR=X .X)
as close to absolute zero as possible. The f irst time the ↑
or ↓ key is pressed, the software zero is set to absolute
zero. Subsequent moves change the setting of the zero
potentiometer. Valid settings for the zero potentiom eter are
between 5% and 95%.

Pressing ENTER when the desired value has been obtained
to exit the functions changes the GAIN and the TIME
CONSTANT to the values set in the range parameters
(Figure 3-8, Steps 4 and 9), engages the linearizer if this
feature is ON, engages the software zero, stores the new
zero value in non-volatile memory and turns OFF the
solenoid valve for zero gas and returns the analyzer to the
RUN mode. Pressing SHIFT+ENTER to exit this

function will NOT turn the zero gas OFF or set the
software zero.

F

IGURE

3-12. C

G

STEP

1 SPAN

2 SHIFT+ENTER

3

F

IGURE

3-16

KEYBOARD

ENTRY

3-13. V

Rosemount Analytical

HANGING THE ZERO SETTING FOR ANALYZERS WITH CALIBRATION

AS CONTROL

DIGITAL DISPLAY EXPLANATION

SPAN indicates that the analyzer is in the span mode
for the range selected in the range parameters.
PS=XX% is the percent of span potentiometer being
used.

X.X %FS SO2 L2
XXXX ppm SO2 L2

X.X % SO2 L2
X.X %FS SO2 L2

XXXX ppm SO2 L2
X.X % SO2

L2

SHIFT+ENTER returns the analyzer to the RUN mode
without engaging the software span. Do not use the

ENTER key to exit this function unless a
calibration is desired.

To make a change in the span setting, go to Figure 3­14 for the standard analyzer, Figure 3-15 for the
analyzer with the Cal Gas Control option or Figure 3­23 for the analyzer with Auto Zero/Span option.

IEWING THE SPAN SETTING

July 1998

748176-N

I

NITIAL STARTUP AND CALIBRATION

3.10 ZERO CALIBRATION FOR THE ANALYZER WITH THE CAL
GAS CONTROL OPTION

The Calibration Gas Control Option allows one-man calibration. This option consists of
two form C contacts rated 3A-125/250 VAC or 5A-30 VDC, (resistive). These contacts
are connected to a solenoid valve (customer supplied) which will turn zero and span
calibration gases on and off when activated. Pressing ENTER at the [ZERO PS=XX%]
display activates the solenoid valve, turning on the zero calibration gas. Pressing
ENTER to exit the function at the [ZR=X.X PS=XX%] display deactivates the solenoid
valve. turning off the zero calibration gas.

Note
For instruments with Calibration Gas Control Option or Auto Zero/Span Option,

pressing ENTER at the [ZERO PS=XX%] display turns on the solenoid valve
(customer supplied) for zero calibration gas. To turn this valve off, press ENTER
to exit this function. Pressing SHIFT+ENTER to exit this function will NOT turn
off the relay for this valve.

Note
When entering this function for viewing purposes only, press SHIFT+ENTER to

exit. Press ENTER to exit the function only if a calibration has been made.

3.10.1 C

ALIBRATING THE ANALYZER WITH CALIBRATION GAS CONTROL OPTION

WITH

ERO GAS

Z

1. Allow system to warm up a minimum of one and one half hours.

2. Connect the solenoid valve for the zero gas to the two form C contacts. Connect
the zero gas to the sample cell inlet located on the back of the analyzer. The gas
should flow at a flow rate of 500 cc/min, as read on a flowmeter.

3. Press the keys in the following sequence to calibrate the zero setting for the
analyzer for each range desired:

3.11 SPAN CALIBRATION

3.11.1 H

The Model 880 Analyzer has both a hardware and a software span for all three
ranges. The hardware span is the adjustment of the span potentiometer with the up
and down arrows when the analyzer is in the span setting mode. The display for the
span setting mode is [X.XX NN% MMM →] where X.XX is the run mode value, NN% is
the percentage of span potentiometer in use and MMM is the span gas value.

ARDWARE AND SOFTWARE SETTINGS FOR SPAN GAS

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July 1998

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ISPERSIVE INFRARED ANALYZER

There are three span potentiometers, one for each range, that can be calibrated.
These span potentiometers should be adjusted with the up or down arrows at the
[X.XX NN% MMM →] display so that the run mode value [X.XX] is between 51 % and
99 % of the span gas value [MMM] while keeping the span potentiometer [NN %]
between 5 % and 95 %. Span potentiometer values outside this range will not be
accepted. Also, if the run mode value is not between 51 % and 99 % of the span gas
value, the software span cannot be made and an error message of ER1, ER2 or ER3
will flash on the run mode screen. If the setting cannot be made while keeping within
these ranges, the digital GAIN must be changed. Refer to Section 5.7 and Figure 3-8,
STEP 4.

Pressing the up or down arrow for the first time resets the present software span
factor to one. Pressing ENTER after the hardware span has been set engages the
software to multiply the run mode value by the span factor. This new span factor will
be stored in nonvolatile memory until the analyzer is recalibrated. Pressing
SHIFT+ENTER does not engage the software span.

Note
If the span potentiometer has been changed, pressing SHIFT+ENTER instead of

ENTER will cause the span factor to be one. This will cause the analyzer to give
faulty readings unless the span gas value is the same as the run mode value.

For instruments with the Calibration Gas Control Option, pressing ENTER at the
[SPAN PS=XX%] display turns on the solenoid valve (customer supplied) for
span calibration gas. To turn this valve off, press the ENTER key when exiting
this function. Pressing SHIFT+ENTER to exit this function will NOT turn off the
relay for this valve.

When entering this function, make sure that there is span calibration gas
connected to the analyzer. When entering this function for viewing purposes
only, press SHIFT+ENTER to exit. Press ENTER to exit the function only if a
calibration is desired.

When the hardware span is engaged, the TIME CONSTANT is set to one second.
Engaging the software span, resets the TIME CONSTANT to the value selected
in Range Parameters (Figure 3.8, STEP 9).

3.11.2 C

ALIBRATING THE ANALYZER WITH SPAN GAS

1. Allow system to warm up a minimum of one and one half hours.

2. Connect span gas to the sample cell inlet at the back of the analyzer. Flow the gas
at a flow rate of 500 cc/min, as read on a flowmeter, through the analyzer for at
least two minutes.

3. Press the keys in the following sequence for those ranges being calibrated.

3-18

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July 1998

748176-N

I

NITIAL STARTUP AND CALIBRATION

STEP

1NONE

2 SPAN SPAN PS=XX%

3 ENTER X.XX NN% MMM.M

4ENTER

KEYBOARD

ENTRY

DIGITAL DISPLAY EXPLANATION

X.X %FS H2O L3
XXXX ppm H2O L3
X.X %FS H2O L3

CALCULATING SPAN

then
X.X %FS H2O L3
XXXX ppm H2O L3
X.X % H2O L3

This is the RUN mode display. Verify that zero
calibration gas is connected to the rear of the analyzer
and turn the gas ON.

Span indicates that the analyzer is in the span mode
for the current range. PS=XX% is the percent of the
span potentiometer being used.

The first set of digits (X.XX ) is the present RUN mode
value. The next digits (NN%) are the percent of the
span potentiometer being used. The thir d set of digits
(MMM) is the calibration span gas value. Use the ↑ or
↓ key to change the percent of the span potentiometer
used so that the RUN mode value (X.XX) is between
51% and 99% of the span gas value (MMM) while
keeping the span potentiometer (NN%) between 5%
and 95%. The first time the ↑ or ↓ key is pressed, it
engages the hardware span. Subsequent moves
changes the setting of the span potentiometer. Span
potentiometer settings outside the range of 5% to 95%
are not allowed.

Pressing ENTER when the desired value has been
obtained to exit the function engages the software
span, stores the new factor in non- volatile m em or y and
returns the analyzer to RUN mode.

Repeat Steps 1 through 4 for Ranges 2 and 3, if used.

F

IGURE

3-14. C

HANGING THE SPAN SETTING

3.12 SPAN CALIBRATION FOR THE ANALYZER WITH THE CAL
GAS CONTROL OPTION

The Calibration Gas Control Option allows one-man calibration. This option consists of
two form C contacts rated 3A-125/250 VAC or SA-30 VDC, (resistive). These contacts
are connected to a solenoid valve (customer supplied) which will turn zero and span
calibration gases on and off when activated. Pressing ENTER at the [SPAN PS=XX%]
display activates the solenoid valve, turning on the span calibration gas. Pressing
ENTER to exit the function at the [X.XX NN % MMM] display deactivates the solenoid
valve. turning off the span calibration gas.

Note
For instruments with the Calibration Gas Control Option, pressing ENTER at the

[SPAN1 PS=XX%] display turns on the solenoid valve (customer supplied) for
span calibration gas. To turn this valve off, press the ENTER key when exiting
this function. Pressing SHIFT+ENTER to exit this function will NOT turn off the
relay for this valve.

748176-N

July 1998

Rosemount Analytical

3-19

M

ODEL

880 NON-D

ISPERSIVE INFRARED ANALYZER

STEP

1NONE

2 SPAN SPAN PS=XX%

3 ENTER X.XX NN% MMM

4ENTER

KEYBOARD

ENTRY

DIGITAL DISPLAY EXPLANATION

X.X %FS HEX L1
XXXX ppm HEX L1
X.X % HEX L1

CALCULATING SPAN

then
X.X %FS HEX L1
XXXX ppm HEX L1
X.X % HEX L1

This is the RUN mode display. Verify that zero
calibration gas is connected to the rear of the analyzer.

Span indicates that the analyzer is in the span mode
for the current range. To change ranges, refer to
Figure 3-8. PS=XX% is the percent of the span
potentiometer being used for current range.

Pressing ENTER turns ON the solenoid valve
(customer supplied) f or s pan calibr ation gas and allows
the span setting to be changed. Allow the span gas to
flow for two minutes before proceeding with the
calibration. The first set of digits (X.XX) is the present
RUN mode value. The second set of digits (NN%) is
the percent of span potentiometer being used. The
third set of digits (MMM) is the calibration span gas
value. Use the ↑ or ↓ key to change the percent of the
span potentiometer used so that the RUN mode value
(X.XX) is between 51% and 99% of the span gas value
(MMM) while keeping the span potentiometer (NN%)
between 5% and 95%. The first time ↑ or ↓ key is
pressed engages the hardware span and sets the
software span to one. Subsequent moves change the
setting of the span potentiometer. Span potentiom eter
settings outside the range of 5% and 95% are not
allowed.

Pressing ENTER when the desired value has been
obtained to exit the function engages the software
span, stores the new factor in non-volatile memory,
turns the solenoid valve for span gas OFF, and returns
the analyzer to RUN mode. Pressing SHIFT+ENTER

to exit this function will NOT turn the span gas OFF
or set the software span.

F

IGURE

3-15. C

G

AS CONTROL

HANGING THE SPAN SETTING FOR ANALYZERS WITH CALIBRATION

3.13 LINEARIZATION

The Model 880 Analyzer can be operated in the linear and non-linear mode.
Linearization can be toggled ON/OFF with the 1' or J, key. In the OFF position,
linearization is disabled for all ranges. In the linear mode the component of interest is
measured in engineering units, either ppm (parts per million) or 5 (percent of
composition), in the non-linear mode measurement is in %FS (percent of fullscale).

The analyzer is linearized with a fourth-order polynomial.

4

3-20

Y = A0 + A1X + A2X2 + A3X3 + A4X

Rosemount Analytical

July 1998

748176-N

I

NITIAL STARTUP AND CALIBRATION

where X is the non-linear input, A0, A1, A2, A3 and A4 are the linearization
coefficients and Y is the linear output.

A typical response curve is located on the application sheet at the back of the manual.
This curve is plotted with X as the concentration and Y as the output deflection.

Each range can be linearized using a separate curve, or the same curve can be used
for all three ranges (Range A=All) when the dynamic range ratio is 3:1 or less. If
Range A is selected, the microp rocessor will use the coefficients in Ran ge 3. Also, if
the linearizer is ON and in Range A, the microprocessor will use the GAIN and TIME
CONSTANT from Range 3, regardless of the GAIN and TIME CONSTANT selected
for Ranges 1 and 2.

When ordered, the linearization coefficients are entered in the appropriate range(s) at
the factory. If one set of linearization coefficients have been ordered and a range has
not been specified, these coefficients will be for Range 3.

To operate the analyzer with a combination of linearized and non-linearized ranges,
turn the linearizer ON and enter the appropriate coefficients for the range(s) to be
linearized. For the non-linearized range(s). enter the following coefficients:

A0 = 0
A1 = 1
A2 = 0
A3 = 0
A4 = 0

Using these coefficients will make the output equal to the input (Y=X). For reasons of
accuracy, this procedure is only recommended for narrow ranges that span a linear
section of the standard curve such as 0 to 100 ppm CO. In the range parameters
select ppm (Figure 3-8, STEP 5) and enter the span gas in ppm (Figure 3-8, STEP 6).
In the run mode, the display will read ppm.

To calculate linearization coefficients other than those installed at the factory, either
11 or 21 data points must be taken. These data points are obtained by using a
precision gas divider with an accuracy of ±0.5 % such as the Model SGD Series-710
Standard Gas Divider™ and following the STEPS in Figure 3-18. These data points
can be entered into any program capable of computing a fourth order polynomial
curve fit. The curve obtained with these data points (Figure 3-17) will have X as the
output (recorder) voltage and Y as the signal concentration. This curve will be the
mirror image of the curve on the application sheet at the back of the manual (Figure
3-16), however the linearization coefficients will be different. Use the coefficients
calculated with the curve in Figure 3-17 for linearization coefficients.

The coefficients in Figure 3-16 may be used to calculate any Recorder Deflection for a
given Concentration. Use these coefficients to solve the equation and calculate the
calibration gas value in Range Parameters [CL GAS XXX %F] Fi gure 3-8. STEP 7.

748176-N

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Y = A0 + A1X + A2X2 + A3X3 + A4X

4

For coefficients determined for user-specific gas, after taking the data points either
use any program capable of calculating a fourth order curve fit or call the factory to
have the specific coefficients calculated using the data determined in Figure 3-18.

When entering user-determined coefficients, note that the microprocessor only
recognizes five significant figures to the right of the decimal point, for example,

0.12345 or 0.00012345, disregard any additional digits.

C12 5% CO (Curve 1)

1.00

0.90

0.80

0.70

F

IGURE

RECORDER NORMALIZED

3-16. T

0.60

0.50

0.40

0.30

0.20

0.10

0.00

0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00

CONCENTRATION NORMALIZED

YPICAL APPLICATION LINEARIZATION CURVE

A0 = 0.007196

A1 = 2.453977

A2 = 2.998715

A3 = 2.270009

A4 = 0.733518

F

IGURE

3-22

1.00

0.90

0.80

0.70

0.60

0.50

0.40

0.30

0.20

CONCENTRATION NORMALIZED

0.10

0.00

3-17. U

SER-DETERMINED LINEARIZATION CURVE

Rosemount Analytical

C12 5% CO (Curve 2)

A0 = 0.000155

A1 = 0.313933

A2 = 0.712239

A3 = 0.890872

A4 = 0.864127

0.00 0.10 0.20 0.30 0.40 0.50 0.60 0.70 0.80 0.90 1.00

RECORDER NORMALIZED

July 1998

748176-N

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NITIAL STARTUP AND CALIBRATION

STEP

10

11

12

13 SHIFT+ENTER XX.X %FS CH4 L1

14 ZERO ZERO PS=XX%

15 SPAN XXXX %FS CH4 L3

16

17

18

19

KEYBOARD

ENTRY

1MODE
2

→

3

→

4

→

5ENTER

6 SHIFT+ENTER

7 MODE SECURITY →
8

→

9ENTER

→

→

→

DIGITAL DISPLAY EXPLANATION

SECURITY →
RANGE *

DIAGNOSTICS *
LINEARIZER *

LIN:OFF RANGE:N →

XX.X %FS CH4 L1

RANGE *

RANGE:N CMP CO →

GAIN=X

FS=XX.X % *
FS=XXXX ppm *

CAL GAS=XXXX ppm *

Pressing MODE allows the mode settings to be viewed
or changed

→ moves the cursor to the next display
→ moves the cursor to the next display
→ moves the cursor to the next display

Pressing ENTER places the analyzer in the linearization
mode. Use the ↑ or ↓ key to toggle the linearizer OFF.
Use the → key to move to the range number. Select
Range 1, 2, or 3 with ↑ or ↓ keys.

Pressing SHIFT+ENTER returns the analyzer to the
RUN mode.

Pressing MODE allows the mode settings to be viewed
or changed

→ moves the cursor to the next display
Pressing ENTER allows the range parameters to be

changed. Range 1, 2 or 3 can be selected with the ↑ or

↓ key.
→ moves the cursor to the next display.

XXXX is fullscale value in ppm or %. This value may be
changed by moving the cursor to a digit with the → and
using the ↑ or ↓ key to obtain the desired value. In the
linear mode, ppm can be toggled to % with the ↑ or ↓
key, depending on the engineering units to be used in
the RUN mode. Enter the span gas value as fullscale
value.

XXXX is the calibration gas value in ppm or %. This
value may be changed by moving the cursor to a digit
with the → key and using the ↑ or ↓ key to obtain the
desired value. Enter the span gas value.

Pressing SHIFT+ENTER returns the analyzer to RUN
mode.

Using zero and span gas, zero and span the analyzer as
described in Figures 3-11 and 3-14 for the standard
equipment or 3-12 and 3-15 for the analyzer with
Calibration Gas Control option or Auto Zero/Span option.

Using a gas divider, deliver 10% span gas to the
analyzer and note the RUN mode value.

Repeat Step 15 for 20% through 100% span gas in
increments of 10%. This will produce 11 data points (0%
through 100%).

For greater accuracy of lower range readings, take 10
more data points between 0% and 10% for a total of 21
data points

Use a computer program to calculate the new
coefficients, or call factory for assistance.

When the new coefficients have been calculated, enter
their values into memory (Figure 3-19).

F

IGURE

748176-N

3-18. D

ATA POINTS FOR USER-DETERMINED LINEARIZATION COEFFICIENTS

July 1998

Rosemount Analytical

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STEP

10

11 ENTER

12 SHIFT+ENTER

KEYBOARD

ENTRY

1MODE
2

→

3

→

4

→

5ENTER

6ENTER

7

→

8ENTER

9ENTER

SHIFT ← LIN:OFF RANGE N →

DIGITAL DISPLAY EXPLANATION

SECURITY →
RANGE *

DIAGNOSTICS *
LINEARIZER *

LINE:OFF RANGE:N →

AO=(-)X.XXXXXXXX ←

A1=(-)X.XXXXXXXX ←

A2=(-)X.XXXXXXXX ←
A2=(-)X.XXXXXXXX ←
A2=(-)X.XXXXXXXX ←

LIN:ON RANGE N →
XXXX ppm CH4 L3

XX.X % CH4 L3

Pressing MODE allows the mode settings to be viewed
or changed

→ moves the cursor to the next display
→ moves the cursor to the next display
→ moves the cursor to the next display

Pressing ENTER places the analyzer in the linearization
mode. Use the ↑ or ↓ key to toggle the linearizer OFF.
Use the → key to move to the range number. Select
Range 1, 2, or 3 with ↑ or ↓ keys.

Pressing ENTER stores the range num ber (1, 2 or 3) in
non-volatile memory.

Accessing this display allows the linearizing coeff icients
to be changed. Use the ↑ or ↓ key to select A0. Use the
→ key to move to the next position and toggle the ­(minus) sign ON/OF F with the ↑ or ↓ keys. Using the →
key to move to the correct position, enter a nine digit
coefficient with the ↑ or ↓ key.

Pressing ENTER stores the f irst linearization coefficient
in non-volatile memory and causes the display to prom pt
the user to enter the next coefficient. Enter the
linearizing coefficient for A1 as in Step 7.

Repeat Steps 7 and 8 and enter the linearizing
coefficients for A2, A3 and A4.

If linearizing coefficients are to be entered for another
range, repeat Steps 5 through 9 for the next range. If
not, turn the linearizer back on with the ↑ or ↓ keys.

Pressing ENTER stores the linear izer ON setting in non­volatile memory.

Pressing SHIFT+ENTER returns the analyzer to RUN
mode.

F

IGURE

3-19. S

ETUP/CHECKOUT OF LINEARIZATION FUNCTION

3.14 ALARM OPTION

The Alarm Option consists of two single point, field-programmable high or low outputs
with a deadband up to 20% of fullscale. The two alarm setpoints are programmable for
one range selected in Figure 3-20, STEP 6, and are dimensionless. The alarms can
be set with one alarm HIGH and one alarm LOW, both alarms HIGH or both alarms
LOW. This option is completely user configurable.

The Status Display will reflect an alarm condition, should one occur. When the
instrument is in alarm condition (exceeding the alarm setpoint), the latch associated
with the alarm is set. W hen the alarm condition clears, (run mode value is less than
the alarm setpoint plus the deadband) the latch is reset.

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NITIAL STARTUP AND CALIBRATION

The high alarm is determined when run mode value exceeds the alarm setpoint. The
alarm is cleared when run mode value is less than alarm setpoint minus the
deadband.

The low alarm is determined when the run mode value is less than the alarm setpoint.
This alarm is cleared when the run mode value is greater than the alarm setpoint plus
the deadband.

ALARM1 and ALARM2 can be toggled with the up and down arrows to either AT.
(automatic) or MAN (manual). In the AUTO (automatic) setting, an alarm relay will be
activated should an alarm condition occur. Alarms are calculated in the AUTO mode
on the basis of parameter settings. The MANUAL mode is the test mode and alarms
are not scanned by CPU. In the MANUAL (test) mode, the ALARM ON/OFF can be
toggled with the up and down arrows to set and reset the alarm latch.

STEP

1MODE
2

3
4
5

6ENTER

7ENTER

8

9ENTER

10

11 ENTER
12
13 ENTER
14 SHIFT+ENTER X.X %FS CO L1

KEYBOARD

ENTRY

→
→
→
→

→

→

→ DEADBAND:XX % ←

DIGITAL DISPLAY EXPLANATION

SECURITY →
RANGE *

DIAGNOSTICS *
LINEARIZER *
ALARM *

ALARM:1 MAN OFF →

RANGE: 1 *

HIGH SET:XXXX *

Pressin
or changed

→ moves the cursor to the next display
→ moves the cursor to the next display
→ moves the cursor to the next display
→ moves the cursor to the next display

Pressin
MODE. Use the
and ALARM2. Use the → ke
next characters, then use the
between MAN
→ ke
key to toggle between OFF/ON.
Pressin
memory.
Use the
alarm. The alarm is onl
Selectin
ranges.
Pressin
memory.
Use the
LOW SET . Move the cursor with the → ke
di
keys.
Pressin
memory.
Use the
up to 20% of fullscale.
Pressin
memory.
Pressin
mode.

MODE allows the mode settings to be viewed

ENTER accesses the ALARM SETPOINT

or ↓ key to toggle between ALARM1

to move the cursor to the

or ↓ key to toggle

manual) or AUTO (automatic). Use the

to move to the next character, then use the ↑ or ↓

ENTER stores the setting in non-volatile

or ↓ key to select Range 1, 2 or 3 for the

valid for the selected range.

a range disables the alarm for the other two

ENTER stores the setting in non-volatile

or ↓ key to toggle between HIGH SET and

to the four

its and change to the desired value with the ↑ or ↓

ENTER stores the setting in non-volatile

or ↓ key to change the value of the deadband
ENTER stores the setting in non-volatile
SHIFT+ENTER returns the analyzer to RUN

F

IGURE

748176-N

3-20. S

ETUP/CHECKOUT OF ALARM OPTION

July 1998

Rosemount Analytical

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880 NON-D

ISPERSIVE INFRARED ANALYZER

3.14.1 STATUS D

ISPLAY

The STATUS display shows the alarms, error messages and security lockout status.
An explanation of error messages is given in Section 5.1. The STATUS display can be
used to check the following alarm setpoints without entering one of the MODE
functions: HIGH/LOW, AUTO/MANUAL and ON/OFF. Refer to Figure 3-21.

The order of priority for error messages, security status and alarms is as follows:

[SECURITY ENABLED/DISABLED]
[E0-ZERO POT LMTS]
[E1-SPAN #1 LMTS]
[E2-SPAN #2 LMTS]
[E3-SPAN #3 LMTS]
[E4-ADC SATURATED]
[E5-ZERO DRIFT]
[E6-SPAN DRIFT]
[RMT: R/L]
[ALARM 1 AUTO/{MAN ON/OFF}]
[ALARM 2 AUTO/{MAN ON/OFF}]
[CAL-CTL PRESENT]
[AUTOCAL: ON/OFF]
[CURRENT 0/4 SP ON/OFF]

Alarm MN (Manual) or AT (Automatic)

ALARM 1 MN OFF

Alarm ON or OFF

F

IGURE

Alarm 1 (15 seconds)

followed by

Alarm 2 (15 seconds)

3-21. S

TATUS DISPLAY

3.15 CURRENT OUTPUT OPTION

The Model 880 Analyzer has an optional 0 to 20 or 4 to 20 mA current output with zero
span suppression. With this option, the current output can represent any suppressed
range with at least a 25% span. For example, a valid range could be 0 to 25%, 28 to
61% or 33 to 100%. When the Zero Span Suppression is off (NO), the analyzer
defaults to the 0 to 100% range. Refer to Figure 3-22.

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NITIAL STARTUP AND CALIBRATION

STEP

10 ENTER

11

12 ENTER
13 SHIFT+ENTER X.X %FS CO2 L1

KEYBOARD

ENTRY

1MODE
2

→

3

→

4

→

5

→

6

→

7ENTER

8ENTER

9

→

→ XX TO XXX %FS ←

DIGITAL DISPLAY EXPLANATION

SECURITY →
RANGE *

DIAGNOSTICS *
LINEARIZER *
ALARM *
CURRENT OUTPUT *

CURRENT:4 20mA →

ZR/SPN SUPR:NO *

Pressin
or changed

→ moves the cursor to the next display
→ moves the cursor to the next display
→ moves the cursor to the next display
→ moves the cursor to the next display
→ moves the cursor to the next display

Pressin
chan
mA.

Pressin
memory.

→ moves the cursor to the nex t displa
ke
off).

Pressin
memory.

→ moves the cursor to the next displa
zero suppression ran
with the → ke
ke
be in percent fullscale, even in the linear mode. An
range may be selected as long as the span is at least
25% of fullscale.

Pressin
memory.

Pressin
mode.

MODE allows the mode settings to be viewed

ENTER allows the Current Output option to be

ed. Use the ↑ or ↓ key to toggle between 0 and 4

ENTER stores the setting in non-volatile

. Use the ↑ or ↓

s to toggle between YES/NO (zero suppression on or

ENTER stores the setting in non-volatile

. Change the

e by moving the cursor to a digit

and changing the setting with the ↑ or ↓

. The value of the upper and lower lim its will always

ENTER stores the setting in non-volatile
SHIFT+ENTER returns the analyzer to RUN

F

IGURE

3-22. S

ETUP/CHECKOUT OF CURRENT OUTPUT OPTION

3.16 AUTO ZERO/SPAN OPTION

The Auto Zero/Span Option allows automatic unattended calibration at set intervals.
The option has six contact closures, four of which are field programmable for
frequency and duration of the calibration cycle (span 1. span 2, span 3 and zero),
while the other two contact closures indicate insufficient zero and span adjustments,
and also drift limits for zero and span, if activated.

The auto zero/span [ACAL: ON] display allows the user to select ON or OFF to turn
the Auto Zero/Span Option "on" or "off". Toggling from OFF to ON resets the timers
for the Auto Zero/Span Option. To reset the timers when the Auto Zero/Span Option is
"on", toggle from ON to OFF to ON.

The sample and hold [SH: YES] display allows the user to select YES or NO to turn
the automatic sample and hold "on" or "off". When the sample and hold feature is
"on", the recorder and Current Output Option do not get updated until the calibration
sequence is completed.

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The range selection [RANGE: 1Y 2Y 3Y] display allows the user to select the ranges
which will be automatically calibrate d with span gas by using the → arrow to move the
cursor to the desired range and using the ↑ or ↓, key to select Y (yes) or N (no) for
each range. The zero for all three ran ges will be calibrated at each interval regard less
of range(s) selected.

The initial delay [DELAY nnn HR] display allows the user to select the amount of time
until the first automatic calibration occurs. This is the initial delay until the automatic
cycle starts. At this time a zero and span calibration is made, regardless of selection. If
a zero delay is selected, there will be an autom a t ic two min ute delay.

The purge [PURGE: nnn MIN] display allows the user to select the amount of time for
the calibration gas to flow through the analyzer before the calibration starts for zero
and span, or the amount of time for sample gas to flow through the analyzer before
run mode values are recorded when the sample and hold feature is selected. The
analyzer is calibrated during the final minute of purge time. During the remaining
purge time, the signal is modified according to previous calibration data.

The repeat zero [RPT ZERO nnn HR] display allows the user to select the amount of
time between zero calibrations. This is the amount of time after the initial calibration
before the zero calibration is repeated without repeating the span calibration.

Note
Each time a span calibration is made, a zero calibration is also made regardless

of selection. The keyboard is disabled during the auto zero/span sequence.
During the auto zero/span sequence, the time constant is set to one second.
Upon completion of the calibration sequence, the time constant is reset to the
value chosen in Range Parameters, Figure 3-8, STEP 9. In order to engage the
Auto-Cal function with the Remote Range I/O Option, the Auto-Cal function must
be disabled by toggling AUTO-CAL to OFF in the [AUTO-CAL:OFF] display,
STEP 8, Figure 3-23.

The repeat span [RPT SPAN nnn HR] display allows the user to select the amount of
time between span calibrations. This is the amount of time after the initial span
calibration before this calibration is repeated.

The [DRIFT LIMIT: ON] display allows the user to determine the maximum amount of
span and zero drift allowable. The [ZR-DFT: +/- XX%] or [SP-DFT: =/- XX%] displays
allow the user to select the percentage of fullscale by which the analyzer is allowed to
drift from the reference span or zero calibration values. The maximum zero drift limit is
10% fullscale and the maximum span drift is 15% fullscale.

In the linearized mode, these values should be obtained from the Response Curve for
Range located at the back of the manual. For the linear mode, locate the amount of
span or zero drift limit desired on the bottom scale and find the corresponding
Recorder Deflection value on the side scale. These are the values that should be
entered in [ZR-DFT: +/-XX % *] or [S-DFT:R# +/- XX% ←].

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NITIAL STARTUP AND CALIBRATION

The reference span or zero calibration is the first calibration after the drift feature is
toggled to "ON" in the DRIFT LIMIT display (Figure 3-23, STEP 8) or the first
calibration after a range is reset from "N" (off) to "Y" (on) in the [RANGE: 1Y 2Y 3Y]
display (Figure 3-23, STEPS 12, 14 and 16) if the DRIFT LIMIT has been toggled to
ON in the [DRIFT LIMIT: ON] display.

STEP

1MODE
2

3
4
5
6
7

8ENTER

9ENTER

10

11 ENTER

12

13 ENTER
14
15 ENTER
16
17 ENTER
18
19 ENTER

20

21 ENTER

KEYBOARD

ENTRY

→
→
→
→
→
→

→

→

→

→

→

→

DIGITAL DISPLAY EXPLANATION

SECURITY →
RANGE *

DIAGNOSTICS *
LINEARIZER *
ALARM *
CURRENT OUTPUT *
AUTO-CAL *

AUTO-CAL: OFF →

SH-V:N SH-I:N *

SH-V:N SH-I:N *

RANGE 1Y 2Y 3Y *

RANGE 1Y 2Y 3Y *

RANGE 1Y 2Y 3Y *

DELAY nn HR *

Pressin
or changed

→ moves the cursor to the next display
→ moves the cursor to the next display
→ moves the cursor to the next display
→ moves the cursor to the next display
→ moves the cursor to the next display
→ moves the cursor to the next display

Pressin
set or checked.. Use the ↑ or ↓ key to toggle between
ON/OFF (Auto Zero/Span feature ON/OFF). This
activates the Auto Zero/Span Option. Toggling from
OFF to ON resets the CPU and the timers.

Pressin
memory.

→ moves the cursor to the nex t dis
ke
hold feature for current for voltage).

Pressin
memory.

Use the → key to move the cursor to SH-I:N. Use the →
or ← ke

feature for current "ON") or N (NO) (sample and hold
feature for current "OFF").

Pressin
memory.

→ moves the cursor to the nex t dis
keys to toggle between Y (YES) or N (NO) for Range 1.

Pressin
memory.

Use the → ke
Y or N.

Pressin
memory.

Use the → ke
Y or N.

Pressin
memory.

→ moves the cursor to the nex t dis
ke
calibration

Pressin
memory.

MODE allows the mode settings to be viewed

ENTER allows the Auto Zero/Span option to be

ENTER stores the setting in non-volatile

s to toggle between Y (YES) or N (NO) (sample and

ENTER stores the setting in non-volatile

s to toggle between Y (YES) (sample and hold

ENTER stores the setting in non-volatile

ENTER stores the setting in non-volatile

to move the cursor to Range 2 and select

ENTER stores the setting in non-volatile

to move the cursor to Range 3 and select

ENTER stores the setting in non-volatile

s to select the number of hours (0...99) until the initial

ENTER stores the setting in non-volatile

. Use the ↑ or ↓

. Use the ↑ or ↓

. Use the ↑ or ↓

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ETUP/CHECKOUT OF AUTO ZERO/SPAN OPTION (CONTINUED ON

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880 NON-D

ISPERSIVE INFRARED ANALYZER

STEP

22

23 ENTER

24

25 ENTER

26

27 ENTER

28

29 ENTER

30

31 ENTER

32

33 ENTER

34

35 SHIFT+ENTER XXXX ppm H20 L2

KEYBOARD

ENTRY

→

→

→

→

→

→ S-DFT:R1 +/-15% ←

→ S-DFT:R2 +/-15% ←

DIGITAL DISPLAY EXPLANATION

PURGE: nn MIN *

RPT ZERO: nnn HR *

RPT SPAN: nnn HR *

DRIFT LIMIT: OFF *

ZR-DFT: +/-10%

S-DFT:R1 +/-15% ←

→ moves the cursor to the nex t dis
ke

s to select the number of minutes (2...99) for the

analyzer to be purged with sample or calibration gas.
Pressin

memory.
→ moves the cursor to the nex t dis

ke
s
made each time a span calibration is made, enter onl
the number of hours between each zero calibration made
without an accompanying span calibration.

Pressin
memory.

→ moves the cursor to the nex t dis
ke
zero calibration. A zero calibration is automaticall
each time a span calibration is made.

Pressin
memory.

Use the → ke
Use the
ON/OFF.

Pressin
memory.

Use the → ke
display. Use the ↑ or ↓ keys to select the percent
fullscale of zero drift (1...50) allowable for all three
ranges.

Pressin
memory.

→ moves the cursor to the nex t dis
ke
the cursor to the right and select the percent fullscale of
span drift (1...50) allowable for the selected range.

With the cur sor under the value, pressing ENTER stores
the setting in non-volatile memory.

Use the ← key to return to range selection and select
another ran
the cursor under the value to store the setting in non­volatile memory. Repeat for third range.

Pressin
mode.

ENTER stores the setting in non-volatile

s to select the number of hours (0...99) between each

an calibration. Since a zero calibration is automatic all

ENTER stores the setting in non-volatile

s to select the number of hours (0...99) between each

ENTER stores the setting in non-volatile

to move the cursor to the next display.

or ↓ keys to toggle the DRIFT LIMIT feature

ENTER stores the setting in non-volatile

to move the cursor move to the next

ENTER stores the setting in non-volatile

s to select range 1, 2 or 3. Use the → key to move

e. Repeat step 30, pressing ENTER with

SHIFT+ENTER return the analyzer to RUN

. Use the ↑ or ↓

. Use the ↑ or ↓

. Use the ↑ or ↓

made

. Use the ↑ or ↓

F

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3-23. S

ETUP/CHECKOUT OF AUTO ZERO/SPAN OPTION (CONTINUED FROM

PREVIOUS PAGE

)

3.17 REMOTE RANGE INPUT/OUTPUT OPTION

The Model 880 Analyzer has optional remote input/output capability. When the
Remote Range Input/Output Option is switched to REMOTE, in the run mode the
range indicator at the right corner of the display will be R# instead of L#. Refer to
Table 3-2 for explanations of BIN (binary) and DEC (decimal). When SPECIAL (Figure
3-24, STEP 11) is selected, only autocal status and remote/local output on bits 6 and
7, respectively.

3-30

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July 1998

748176-N

I

g

g

p

g

play

y

(

g

g

NITIAL STARTUP AND CALIBRATION

STEP

10 ENTER

11

12 ENTER
13 SHIFT+ENTER X.X %FS CO2 R1

KEYBOARD

ENTRY

1MODE
2

→

3

→

4

→

5

→

6

→

7

→

8

→ REMOTE I/O ←

9ENTER

→

DIGITAL DISPLAY EXPLANATION

SECURITY →
RANGE *

DIAGNOSTICS *
LINEARIZER *
ALARM *
CURRENT OUTPUT *
AUTO-CAL *

CNTRL:REMOTE →

IN/OUT:BIN/BIN ←

Pressin
or changed

→ moves the cursor to the next display
→ moves the cursor to the next display
→ moves the cursor to the next display
→ moves the cursor to the next display
→ moves the cursor to the next display
→ moves the cursor to the next display
→ moves the cursor to the next display

Pressin
remote or local in
between LOCAL or REMOTE.

Pressin
memory.

→ moves the cursor to the nex t dis
ke

binary/decimal), SPECIAL or DEC/DEC

(decimal/decimal).
Pressin

memory.
Pressin

mode.

MODE allows the mode settings to be viewed

ENTER allows the analyzer to be placed in

ut/output. Use the ↑ or ↓ key to toggle

ENTER stores the setting in non-volatile

. Use the ↑ or ↓

s to select BIN/BIN (binary/binary), BIN/DEC

ENTER stores the setting in non-volatile
SHIFT+ENTER returns the analyzer to RUN

F

IGURE

3-24. S

ETUP/CHECKOUT OF REMOTE INPUT/OUTPUT OPTION

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OUTPUT

BIT DESIGNATION

0 RANGE I.D.
1 RANGE I.D.

2 RANGE I.D.
3 Not used

4 Not used
5 Not used
6 AUTO-CAL STATUS
7 REMOTE/LOCAL STATUS

INPUT

BIT DESIGNATION

0 RANGE SELECTION IN REMOTE
1 RANGE SELECTION IN REMOTE
2 RANGE SELECTION IN REMOTE
3 Not used
4 Not used
5 Not used
6 AUTO-CAL REQUEST
7 NOT USED

Note: The Auto-Cal request BIT is level triggered and therefore, it is the responsibility

of the user to verify that the BIT is brought low before the analyzer completes
the Auto-Cal process.

T

ABLE

T

ABLE

3-1. R

EMOTE RANGE

I/O B

IT DESIGNATION

MODE RANGE BIT 2 BIT 1 BIT 0

BINR3011
BINR2010
BINR1001

DECR3100
DECR2010
DECR1001

3-2. R

EMOTE RANGE

I/O B

INARY AND DECIMAL BIT CODING

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R

OUTINE OPERATION AND THEORY

4

4.1 ROUTINE OPERATION

First set the range for desired operating range: 1, 2, or 3. Then follow the steps for
zero and span (Sections 3.8 and 3.9). Next supply sample gas through the instrument.
The Model 880 will now automatically and continuously analyze the sample stream.

As a check of instrument performance, it is recommended that the operator keep a log
of the zero/span status.

4.2 RECOMMENDED CALIBRATION FREQUENCY

Maximum permissible interval between calibrations depends on the analytical
accuracy required and cannot, therefore, be specified. It is recommended initially that
the instrument be calibrated once every 8 hours and that this practice be continued
unless experience indicates that some other interval is more appropriate.

A change in cell pressure of 1 inch of mercury (3.38 kPa) will result in a readout error
of approximately 3% of reading. Therefore, if barometric pressure changes
significantly, it is advisable to recheck the calibration against an upscale standard gas.

4.3 SHUTDOWN

The Model 880 will retain settings during prolonged shutdown. Recalibrate the
instrument upon restart.

4.4 DETECTION SYSTEM THEORY

As shown in Figure 4-1, infrared radiation is produced from two separate energy
sources. This radiation is interrupted by a chopper at 5 Hz. Depending on the
application, the radiation may then be optically filtered to reduce background
interference from other infrared-absorbing components.

Each infrared beam passes through a cell, one containing a continuously flowing
sample and the other cell sealed or with a continuously flowing reference gas.

During analysis, a portion of the infrared radiation is absorbed by the component of
interest in the sample, with the quantity of infrared radiation absorbed being
proportional to the component concentration. The detector is a “gas microphone”
based on the Luft principle. It converts the difference in energy between sample and
reference cells to a capacitance change. This capacitance change, proportional to
component concentration, is processed and indicated on the display.

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INFRARED

SOURCE

ISPERSIVE INFRARED ANALYZER

CHOPPER

SAMPLE IN

REFERENCE

CELL

DETECTOR

STATIONARY

BUTTON

SIGNAL

SIGNAL

CONDITIONING

CIRCUITRY

SAMPLE
CELL

SAMPLE OUT

DIAPHRAGM
DISTENDED

COMPONENT OF INTEREST

OTHER MOL ECULES

F

IGURE

4-2

4-1. F

Rosemount Analytical

UNCTIONAL DIAGRAM OF DETECTION SYSTEM

July 1998

748176-N

T

ROUBLESHOOTING

5

5.1 ERROR CODE SUMMARY

In the Run Mode, the error codes described in Table 5-1 may appear on the display.
These messages also are shown on the STATUS display in a slightly different f ormat.
Error messages in Table 5-1 are listed in order of priority.

Note:
When using the DIAGNOSTICS display to help make hardware

adjustments, set the analyzer GAIN to one. Otherwise, the ADC may be in
saturation resulting in a false value in the DIAGNOSTICS display.

RUN

MODE

DISPLAY

STATUS DISPLAY EXPLANATION

ERO

ER1 [E1-SPAN #1 LMTS]

ER2 [E2-SPAN #2 LMTS]

ER3 [E3-SPAN #3 LMTS]

ER4

ER5 [E5-ZERO DRIFT]

ER6 [E6-SPAN DRIFT]

Note: If any of the above error messages occur, software will restore previous values.

T

ABLE

[EO-ZERO POT
LMTS]

[E4-ADC
SATURATED]

5-1. E

RROR CODE SUMMARY

Zero Potentiometer setting is such that
mV is required to make a software zero.

Zero must be reset.

Span errors for Range 1, Range 2, or Range 3.
Software span is outside limits so that the rum mode
value is not between 55% and 99% of the span gas
value while in the Span Mode.

Signal into ADC is greater than fullscale rating. Refer to
Figure 3-6 and reduce the digital GAIN setting by one
value, i.e. 8 to 4, 4 to 2 or 2 to 1. If the GAIN is initially
on 1, switch from High to Low gain.

Zero drift limit exceeded. To clear, recalibrate or toggle
the drift limit OFF and then ON. See Figure 3-14.

Span drift limit exceeded. T o clear, recalibrate or t oggle
the drift limit OFF and then ON. See Figure 3-14.

more

than 500

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5.2 OSCILLATOR TUNE ADJUSTMENT

This procedure should not be performed on a routine basis:

1. Refer to Section 3.8, and access the Oscillator Tune display.

2. Adjust coil knob (Oscillator Tune, located on top of the detector housing) clockwise
or counterclockwise until a maximum reading is obtained on the display.

3. Adjust the coil knob counterclockwise until the unit reads between 75 and 80% of
the maximum value.

5.3 PREAMP GAIN

The preamp gain is used to adjust the fullscale value at TP2 and the diagnostic
display to 7.5V. To prevent saturation, this value must never be higher than 7.5V,
fullscale. If this value is too low or is above 7.5V, adjust the preamp gain.

1. Refer to Section 3.8, and access the Detector Signal display.

2. Flow SPAN calibration gas for the least sensitive range through the SAMPLE
CELL for a minimum of two minutes.

Example:

Range 1 - 500 ppm CO
Range 2 - 2000 ppm CO
Range 3 - 5000 ppm CO

In this case, the least sensitive range would be 5000 ppm.

3. If the calibration gas is not equal to fullscale, find the percent fullscale of the
calibration gas by looking at the application curve at the back of the manual.

4. Multiply this value by 7.5 and record the resultant value for Step 5. For example, if
the SPAN gas is 67 % of fullscale, then:

0.67 x 7.5 = 5

In this case, the value to be used in Step 5 is 5.

5. Adjust the displayed value with preamplifier gain potentiometer R3, located on the
Signal Board, for the value obtained in Step 4. THIS VALUE SHOULD NEVER BE

HIGHER THAN 7.5.

Note:
For applications with very low concentrations (for example Range 3 = 400

ppm CO), the fullscale value at TP2 and the Diagnostics Display may be
considerably less than 7.5V.

5-2

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ROUBLESHOOTING

T

5.4 SOURCE BALANCE SHUTTER ADJUSTMENT

Note:
These adjustments are part of the factory checkout and are not normally

required for routine operation, but must be performed whenever the optical
system is disturbed (i.e., removal of cells for cleaning).

1. Access Diagnostics Mode (See Section 3.8), and access the Detector Signal
display.

2. Flow zero gas (nitrogen) through the SAMPLE CELL for a minimum of two
minutes.

3. Slightly loosen the threaded hex standoff on the sample cell shutter adjust screw.
The shutter adjust screw is located on top of the motor source assembly (Figure 7-

1)

4. Using a screwdriver, rotate the shutter adjust screw until a minimum reading on the
display is obtained. A typical reading is 0.2 to 0.5. Add 0.4 to this value. Use this
value for Step 5.

5. Rotate the shutter adjust screw clockwise (viewed from the screw head) until the
display reads the value obtained in Step 4.

6. Re-tighten the threaded hex standoff. Ensure that the display does not change.

5.5 SOURCE CURRENT ADJUSTMENT

1. Follow steps 1 through 6 in Figure 3-9 to access the Source Current display.

Refer to DWG 624073. Adjust the trim potentiometer (R9) located on the Power
Supply Board to view the desired current on the digital display until the value on the
display is within ±10 of the value on the application data sheet. Clockwise adjustment
of R9 will increase the value. Counterclockwise will decrease the value.

5.6 VOLTAGE CHECKS

Refer to Section 3.8 and ensure that the voltages for the detector signal and the three
power supplies are correct.

5.7 DIGITAL GAIN ADJUSTMENT

The digitally controlled GAIN amplifier does not normally need adjustment, however, in
the event that the analyzer cannot be spanned, the GAIN must be adjusted as follows:

1. Follow the STEPS for Spanning the Analyzer in Sections 3.14 (standard analyzer)
or 3.15 (analyzer with the Calibration Gas Control Option) and span the analyzer. If
the Run Mode value is not between 51% and 100% of the span gas value, while
keeping the span potentiometer between 5% and 95%, then the digital GAIN
should be adjusted. (The ideal span pot setting is 50%.) Note the final value of the
PS (potentiometer status) for Step 4.

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2. Exit to Run Mode.

3. Follow steps 1 through 4 in Figure 3-8 to obtain the GAIN display in the RANGE
parameters menu.

4. Change the GAIN setting to a value higher or lower than the original value. The
GAIN may be changed to 1, 2, 4, or 8. If the span potentiometer status (PS) was at
the top of its range in Step 2 (95%), then the GAIN should be raised. If the span
potentiometer status (PS) was at the bottom of its range in Step 2 (5%), the GAIN
should be lowered.

5. Press SHIFT/ENTER to return to Run Mode.

6. Repeat Step 1. If the analyzer still cannot be spanned, repeat steps 3 through 5 for
a new GAIN value.

5.8 CASE HEATER TEMPERATURE CONTROL

Malfunction in this option can occur in three sections:

EATER

H

Check with an ohmmeter for continuity. The heater resistance is approximately 113
ohms.

EMPERATURE SENSOR

T

This is an RTD and should have approximately 550 ohms at 25°C. Check with
ohmmeter for continuity.

VER TEMPERATURE FUSE

O

This is a thermal fuse that opens above 72°C. Check for continuity with an ohmmeter.
If the above are functional, refer to Drawing 624073 for circuit diagram and

troubleshoot board.

5.9 DETECTOR HEATER

There are three sections that can cause a malfunction

EATER

H

Check with an ohmmeter for continuity. The heater resistance is approximately 113
ohms.

EMPERATURE SENSOR

T

This is an RTD and should have approximately 550 ohms at 25°C. Check with
ohmmeter for continuity.

VER TEMPERATURE FUSE

O

This is a thermal fuse that opens above 72°C. Check for continuity with an ohmmeter.

5-4

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ROUBLESHOOTING

T

PROBLEM PROBABLE CAUSE ACTION TO BE TAKEN

Check fuse; reset if necessary.

DIGITAL DISPLAY DOES NOT

LIGHT UP

UNABLE TO SPAN

ANALYZER

U

NSTABLE, NOISY SIGNAL

E

XCESSIVE DRIFT WITH
CHANGING AMBIENT
TEMPERATURE

L

OW SENSITIVITY

No power to analyzer

Check input power and
connections.

Check Power Supply Board.
CPU Board
Digital GAIN needs

adjustment
Preamplifier gain needs

adjustment
Source current needs

adjustment

Check power connector to CPU

Board.

See Section 5.7

See Section 5.3

See Section 5.5
Oscillator tune See Section 5.2

Time constant too low See Section 3.7
Temperature Control

Assembly
Sources need to be

replaced

See Section 5.8

The resistance of both sources

should be 24 ±3 ohms.

B

ASELINE DRIFT

E

RROR MESSAGES WHEN

ATTEMPTING TO CALIBRATE

U

NABLE TO SPAN OR ZERO

ANALYZER

F

IGURE

5-1. T

ROUBLESHOOTING CHART

Loss of source current See Section 5.5
Source balance See Section 5.4

Detector signal should be

between 0.4 and 1 volt with zero
Check Diagnostics
Display

gas, 7.5 volts, maximum, on

high range with 100% fullscale

span gas. Adjust GAIN

potentiometer, see Section 5.3
Calibration parameters

incorrect

The zero value must be close to

zero before pressing ENTER.

The concentration display (left

side of display) must be less

than the span gas displayed in

the right side of the display, but

greater than 50% of the

fullscale range.

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OSCILLATOR BOARD

Information Signal
(5 Hz capacitance change)

SOURCE

Detector
(Modulator)

SIGNAL BOARD

BUFFER

AMPLIFIER

LOWPASS

FILTER

DIGITALLY
CONTROLLED

OSCILLATOR

AMPLIFIED

UNFILTERED

5 Hz SIGNAL

ZERO

ZERO

SUPPRESSION

REF

AMPLITUDE-MODULATED

10 MHz CARRIER

WITH NOISE

5 Hz

BANDPASS

FILTER

DIGITAL

GAIN

X 1
X 2
X 4
X 8

FILTERED OUT

SPAN 1, 2, 3
DIGITALLY
CONTROLLED

VOLTAGE

D

BLER

5 Hz

FULLWAVE
RECTIFIER

MUX ADC MICRO

HALFWAVE
RECTIFIED CARRIER

FULLWAVE

RECTIFIED 5 Hz

SIGNAL

TIME

CONSTANT
SOFTWARE

SPAN

DAC

DACLIN

SOFTWARE

ZERO

F

IGURE

5-6

5-2. S

Rosemount Analytical

IGNAL WAVEFORMS

July 1998

748176-N

A. Functional Diagram - Circuitry in Tune Mode

Tank Circuit Voltage Doubler Rectifier

Diaphragm Undistended

DETECTOR

Stationary

L1

10 MHz
Oscillator

Metal Button

Reference
Chamber

Sample
Chamber

ROUBLESHOOTING

T

Detector Oscillator
Tune Output

OSC. TUNE

B. Tank Circuit Resonance Curves

Carrier

Amplitude

Max. Obtainable
Amplitude

75% to
80% of
max.

Diaphragm at
maximum
Distention

Curve 1. OSCILLATOR TUNE Control set for
maximum obtainable meter reading.

Curve 2. OSCILLATOR TUNE Control set for 75% to 80%
of maximum obtainable meter reading.

Curve 3. Sample beam blocked, causing maximum
distention of diaphragm.

Amplitude with Sample
Beam Blocked

F

IGURE

748176-N

Tank Circuit
Resonant Frequency

5-3. M

Crystal Frequency
(10 MHz)

ODULATION SYSTEM

Decrease in inductance and/or capacitance in tank
circuit shifts resonance curve to right, decreasing
carrier amplitude.

July 1998

Note:

Rosemount Analytical

5-7

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880 NON-D

ISPERSIVE INFRARED ANALYZER

5-8

Rosemount Analytical

July 1998

748176-N

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OUTINE SERVICING

WARNING: ELECTRICAL SHOCK HAZARD

Servicing requires access to live parts which can cause death or serious
injury. Refer servicing to qualified personnel.

Note:
Before servicing analyzer, disconnect power and shut off sample flow to

unit.

6.1 CELL REMOVAL, CLEANING AND INSTALLATION

1. Slide chassis out.

2. Remove sample lines:

6

a. From the end cap assemblies (long cell).
b. From the sample cell (short cell).

3. Remove the two hold-down screws on the motor/source assembly (Figure 7-1).

4. Gently move the motor/source assembly away from the detector.

5. For long cell models, support the cell while performing Step 4. The cell and its
O-rings will now be free.

6. For short cell models. the three retaining screws holding the two end caps and
sample cell must be removed. The cell, end caps and O-rings will now be free.

7. Rinse the cell with acetone. If this does not remove all foreign matter, use a soft
brush. Do not use any metallic object inside the cell because it will scratch the
gold plating.

8. After all matter has been removed, rinse the cell with distilled water and allow to
air dry. Do not use towels.

9. Inspect the cell inside by holding it up to a bright light. If particles are seen, repeat
Steps 7 and 8 as often as necessary.

10. After cleaning cell, examine O-rings at the source, detector, and end caps. If
damaged, replace with new O-rings.

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ISPERSIVE INFRARED ANALYZER

11. Remove any contaminants from windows with a lint free cloth soaked in acetone.
Do not use alcohol or other solvents. Allow to air dry.

12. To replace the cell perform the following steps:

a. Long cell - fit it into position. Make sure that the O-rings seat properly.
b. Short cell - replace the three retaining screws holding two end caps. Make sure

that the O-rings seat properly.

c. Move the motor/source assembly back into position. Make sure that the

O-rings seat properly.

13. Replace the two hold-down screws on the motor/source assembly. Do not
overtighten.

14. Check for leaks as instructed in Condensed Startup and Standardization
Procedure (Section A). Take corrective action if necessary.

GAS DESICCANT PART NUMBER

2

CO

Cardoxide 096218

4)2

2

2

2

2

2

096217
096217
096217
096217
096217

096217/096218

T

ABLE

6-1. T

CO Mg (CI04)
H2OMg (CI0
SOS Mg (CI04)

4

CH
Hexane Mg (CI04)
CO + CO

2

Mg (CI04)

Cardoxide + Mg (CI04)

YPES OF DESICCANT

6.2 CELL DESICCANT

The reference cell may use a flowing reference. If so, desiccant is required.
A desiccant holder is used on the inlet and outlets to keep moisture from entering the

reference cell. The desiccant should be replaced each time the cell is opened. To
determine the type of desiccant used, refer to Table 6-1.

6.3 SOURCE REPLACEMENT

Refer to Figure 6-2. Sources are marked with the resistance value, for example, 11.5

- 11.6 in matched pairs. Install the higher value as the reference source.

Note:
Refer to Figure 7-1. Observe how the parts are disassembled so that the

reverse procedure can be used for reassembly.

1. Loosen the two screws on the front of the case and slide the front panel forward.

6-2

Rosemount Analytical July 1998

748176-N

OUTINE SERVICING

R

2. Remove the two screws holding the source housing to the chopper housing.

3. Remove the two screws holding the source to the source housing. Note how the

source is mounted. There is a front and back side.

4. If replacing the source, insure that its orientation is exactly the same as the old

one. Each source is marked on the back. Install the source with the higher
designation at the reference site.

5. Reverse the procedure outlined above to reinstall the new source assembly,

6.4 SOURCE BALANCE SHUTTER ADJUSTMENT

When the sources are replaced, follow the Source Balance Procedure in Section 5.4
to adjust the source balance shutter.

6.5 CHOPPER MOTOR ASSEMBLY (P/N 658313)

1. Remove Source Assembly front cover.

2. Remove chopper blade.

3. Remove two screws from rear of motor and remove motor.

6.6 MICROBOARD REPLACEMENT

All calibration constants and settings stored in nonvolatile memory must be changed
when the microboard is replaced. These procedures are given in Section Three, Initial
Startup and Calibration.

Additionally, the zero potentiometer and the three span potentiometers must be
resynchronized with software. To resynchronize the zero potentiometer follow the
steps listed below:

1. Follow the instructions in Figure 3-11 for the standard instrument or 3-12 for the

instrument with Calibration Gas Control Option and access the [ZR=X.X PS=XX%
→] display.

2. Press SHIFT then ↓.

3. Proceed with the zero calibration.
The span potentiometer must be resynchronized for all three ranges as follows:

1. Choose the first range by selecting a range using the range parameters in Figure

3-8.

2. Follow the instructions in Figure 3-14 for the standard instrument or 3-15 for the

instrument with Calibration Gas Control Option and access the [X.XX XX% 100 ↓]
display.

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3. Press SHIFT then ↓.

4. Proceed with the span calibration.

6.7 DETECTOR REMOVAL

Refer to Figure 7-1, Part 5.
Slide chassis out.

1. Remove sample lines:

a. From the end cap assemblies (long cell).
b. From the sample cell (short cell).

2. Remove top cover from detector housing.

3. Remove entire detector assembly by removing the four screws from the base

plate.

4. For long cell configurations, support the cell while performing Step 4. The cell and

its O-rings will now be free.

5. Remove oscillator board.

6. Remove dual end cap assembly for long cells or sample cell and cell assembly for

short cell.

7. Remove two screws holding detector to detector base.

8. Remove detector.

9. Wipe off all the white heat sink compounds from the base plate.

10. Apply new heat sink compound to the detector (supplied with the new detector).

11. Replace detector and reverse the removal process.

Note
When replacing detector, insure that the thermal fuse and temperature

sensor mounted in the base plate is in good thermal contact with the base
plate.

6.8 ELECTRONIC CIRCUITRY

6.8.1 O

SCILLATOR CIRCUIT BOARD AND ASSOCIATED ELEMENTS OF

MPLITUDE-MODULATION CIRCUIT

A

In the Oscillator Circuit (DWG 623995) the 10 MHz carrier wave is generated by a
crystal-controlled radio-frequency oscillator using crystal Y1 and transistors Q1 and
Q2.

6-4

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OUTINE SERVICING

R

The modulation circuit is driven by the detector. the sensing element of the analyzer.
Mechanical functioning of the detector is explained in Paragraph 4.4. Considered
electronically. the detector is a two-plate variable capacitor. The modulator is coupled
inductively, through one winding of inductance T1, to the oscillator. Amplitude of the
10 MHz carrier thus varies with the 5 Hz modulation signal.

6.8.2 F

UNCTIONING OF MODULATION SYSTEM IN

TUNE M

ODE

Preparatory to oscillator tuning, access Oscillator Tune (OT=XX) in the Diagnostic
Display (Figure 39). In this mode the display indicates the rms value of the
halfwave-rectified carrier. The tank circuit is now adjusted in the following two-step
sequence:

1. Tuning: Initially, the OSC TUNE adjustment is set somewhat counterclockwise

from its correct setting. Then, it is rotated clockwise to move the slug into the core,
thus increasing inductance and decreasing resonant frequency. The adjustment is
set for maximum obtainable reading. At this setting, tank-circuit resonant frequency
is the same as oscillator frequency (i.e., nominal 10 MHz). See Resonance Curve
Number 1, Figure 5-2.

2. Detuning: By counterclockwise rotation of the OSC TUNE adjustment, the slug is

partially withdrawn from the core, thus decreasing inductance and increasing
resonant frequency. The adjustment is set so reading decreases to between 75%
and 80% of the maximum obtainable value noted in Step 1, above. See
Resonance Curve Number 2, Figure 5-2. This curve has the same shape as that
obtained in Step 1, immediately preceding, but is displaced to the right.

6.8.3 F

UNCTIONING OF MODULATION SYSTEM IN OPERATING MODE

Overall sensitivity of the analyzer system may now be checked by placing span gas in
the sample beam to simulate absorption of sample-beam energy and thus provide the
maximum obtainable 5 Hz detector-output signal. During that portion of the chopping
cycle, while the chopper is not blocking the sample and reference beams, the
diaphragm distends away from the metal button, thus decreasing detector capacitance
and shifting the tank-circuit resonance curve to the right. At the moment the
diaphragm reaches maximum distention, the curve reaches the position of Curve 3,
Figure 5-3.

The diaphragm now pulses cyclically, causing the resonance curve to move
continuously back and forth within the limits defined by Curves 2 and 3 of Figure 5-2.
Carrier amplitude decreases as the curve moves to the right and increases as it
moves to the left. Thus, the response characteristics of the system depend on the
location of Curve 2. Position of this curve depends on the degree of tank-circuit
detuning used. By detuning to 70% to 75% of the maximum obtainable carrier
amplitude and operating on the portion of the curve thus obtained. maximum slope
yields highest sensitivity and minimum curvature provides best linearity.

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6.8.4 R

ADIO-FREQUENCY DEMODULATOR

The amplitude-modulated 10 MHz carrier from the detector/oscillator circuit is applied
to the radio-frequency demodulator. This circuit is a voltage-doubler type rectifier
utilizing diodes CR1, CR2, CR3, CR4, and capacitor C7. The circuit gives
approximately double the output voltage of a conventional halfwave rectifier. This
result is obtained by charging a capacitor during the normally wasted half-cycle, and
then discharging it in series with the output voltage during the next half-cycle.

6.8.5 S

IGNAL BOARD

(DWG 624085)

The 5 Hz sine wave detector signal goes through an AC amplifier U1A and associated
resistor. The output signal goes through bandpass filter network U2 and U4 to remove
harmonics and distortion. The signal next goes through a precision signal rectifier U3
and Q1 and then through low pass filter U5. This output goes through an RC low pass
filter R29, C13 and U7 and then to inverting buffer amplifier U8 with zero control U11.
The signal goes through a range amplifier consisting of eight bit DAC U9 and the
amplifier U10.

The GAIN is digitally controlled via U15, U16 and U18 resulting in a selectable digital
GAIN of X1, X2, X4 and X8.

The span is controlled for the three ranges with SPAN 1 (U12), SPAN 2 (U13) and
SPAN 3 (U14).

The eight-channel multiplexer (U17) selects the input signals by commands applied to
the switch driver and feeds the selected signal to pin two of J2.

6.8.6 P

OWER SUPPLY BOARD

(DWG 624073)

The power supply board supplies the different voltages to the various boards.
Additionally. the power supply board includes an adjustable source driver circuit. a
chopper motor driver circuit, a proportional temperature controller circuit and a DC to
AC converter for backlight.

6.8.7 A

DAPT OR BOARD

(DWG 624127)

The adaptor board which includes a resettable fuse is used for line power distribution.
The adaptor board also serves as an interface board for all the option boards and
provides the recorder output on TB2.

6.8.8 M

ICROBOARD

The microboard is a self-contained circuit assembly which includes an advanced
microprocessor and multiple I/O functions with a complete analog domain consisting
of analog-to-digital converters and digital-to-analog converters. Multiple output
registers allow the transmission of digital data to and from the board under program
control. The circuit board can be used alone or in conjunction with I/O boards that
satisfy special interfacing requirements such as the following:

6-6

Rosemount Analytical July 1998

748176-N

OUTINE SERVICING

R

1. Current Output

2. Bi-directional Remote Range I/O board

3. Dual Alarm assembly

4. Auto Zero/Span

5. Calibration Gas Control
The board is configured with an analog domain that allows the processing of analog

signals directly with a 12-bit plus sign ADC. In addition, two independent DAC's, each
12 bytes wide, allow the presentation of analog voltages for peripheral functions
immediately.

6.8.9 O

PTIONAL CASE HEATER TEMPERATURE CONTROL BOARD

(DWG 624003)

This is a proportional temperature controller. which works on a variable time method.
Resistors R7, R8, R9, R10, R11 and the sensor form a bridge which feeds a

comparator, AR1. AR1 operates in an ON/OFF mode to drive transistor Q3. The
sensor is a resistor with a positive temperature coefficient (1.925 ohms/oC). The
resistance is 500 ohms at 25 oC.

Resistors R1 through R6, Q1, Q2 and C1 provide the circuit for the time proportioning
action: C1 charges until the voltage on C1 reaches 9.0 V. Q1 then discharges C1, and
the charging process repeats itself. The emitter of Q2 follows the voltage on C1, which
is essentially a sawtooth. This is injected into the bridge, which causes the setpoint to
bump on a variable time basis. Q3 (through LED CR1 ) triggers optical coupler U1
which gates TRIAC (U2). U2 allows fullwave VAC to flow through the case heater
element.

6.8.10 D

UAL ALARM/CALIBRATION GAS CONTROL OPTION BOARD

(DWG 624204)

This board is used for both dual alarm and calibration gas control, depending on the
position of the jumper in the jumper-selectable address. This is a peripheral circuit
function which communicates with the computer via an 8-bit buss arrangement. This
option consists of two form C contacts rated 3A 125/250 VAC or 5A 30 VDC.
(resistive). This circuit board satisfies a dual alarm requirement, as it provides two
medium power relays that can be independently controlled from the central processor.
Also, the board can be used to connect user-supplied solenoid valves to zero and
span calibration gases for one-man calibration. Provision is made to assign a specific
address in the range 0 through 7 using jumpers.

6.8.11 I

SOLATED REMOTE RANGE

I/O O

PTION BOARD

(DWG 624251)

The Remote Range I/O board is a peripheral circuit function which communicates with
the computer via an 8-bit buss arrangement. This assembly provides isolated two way
communication between the host instrument and external user devices. Provision is
made to assign a specific address in the range 0 through 7 using jumpers.

748176-N

July 1998

Rosemount Analytical

6-7

M

ODEL

880 NON-D

ISPERSIVE INFRARED ANALYZER

6.8.12 A

UTO ZERO/SPAN OPTION BOARD

(DWG 624599)

The auto zero/span board is a peripheral circuit function which communicates with the
computer via an 8-bit bus. With the appropriate software it satisfies the auto zero/span
requirement. The assembly provides 6 form C relay contact outputs, 4 of which are
suitable for medium power requirements, the remaining two are relegated to alarm or
indicator functions. Snubbers are provided for the medium power relays. Provision is
made to assign a specific address in the range 0 through 7 using jumpers. The auto­cal request bit is level triggered and therefore, the request line must be brought low
before the analyzer completes the Auto-Cal process.

6.8.13 C

URRENT OUTPUT OPTION BOARD

(DWG 624092)

This board changes the instrument voltage output to an isolated current output for use
with external recorders or data gathering systems.

6-8

Rosemount Analytical July 1998

748176-N

R

EPLACEMENT PARTS

7

The following parts are recommended for routine maintenance and troubleshooting of
the Model 880 Non-Dispersive Infrared Analyzer. If the troubleshooting procedures do
not resolve the problem, contact your local Rosemount Analytical service office. A list
of Rosemount Analytical Service Centers is located in the back of this manual. Figures
7-1 through 7-5 show locations of components and assemblies.

!

WARNING: PARTS INTEGRITY

Tampering or unauthorized substitution of components may adversely
affect safety of this product. Use only factory-documented components for
repair.

7.1 CIRCUIT BOARD REPLACEMENT POLICY

In most situations involving a malfunction of a circuit board, it is more practical to
replace the board than to attempt isolation and replacement of the individual
component. The cost of test and replacement will exceed the cost of a rebuilt
assembly. As standard policy, rebuilt boards are available on an exchange basis.

Because of the exchange policy covering circuit boards the following list does not
include individual electronic components. If circumstances necessitate replacement of
an individual component, which can be identified by inspection or from the schematic
diagrams, obtain the replacement component from a local source of supply.

7.2 SELECTED REPLACEMENT PARTS

While the following sections list parts which are common to all Model 880 applications,
the configuration number is required when ordering parts which are specific to an
individual application. The configuration number (8801-XX or 8802-XX) is on the Data
Sheet in the rear of this manual.

748176-N

623998 Oscillator Board
624006 Temperature Control Board
624076 Power Supply Board
624088 Signal Board

July 1998

Rosemount Analytical

7-1

M

ODEL

880 NON-D

ISPERSIVE INFRARED ANALYZER

623785 Micro Board
622733 Fan, Heater (if used)
622732 Heater (if used)
624433 Thermal Fuse, Fan Heater (if used)
658313 Chopper Motor
624442 Source (Matched Pair)
898733 Detector Thermal Fuse
620298 Detector Heater
622917 Detector Temperature Sensor

Sensor 622917

Temperature Control Board
624006

F

IGURE

7-2

Fan Assembly
622733

7-1. C

Rosemount Analytical July 1998

ASE HEATER TEMPERATURE CONTROL ASSEMBLY

Heater Assembly
622732

748176-N

Chopper
Motor

EPLACEMENT PARTS

R

Source (Matched
Pair)

Source Housing
622706

Shutter Adjustment Screw

Screw

O-Ring
900406

Jam Nut

Teflon
Spacers

Washer, Nylon

Chopper Housing
624166 (Sapphire Windows)
624411 (Irtran Windows)

Chopper Blade
620300

Chopper Cover
624167

F

IGURE

748176-N

7-2. M

OTOR/SOURCE ASSEMBLY

July 1998

Rosemount Analytical

7-3

M

ODEL

880 NON-D

ISPERSIVE INFRARED ANALYZER

Power Supply Board
624076

Case Heater
Temperature Control
Option
(See Figure 7-1, Part 1)

Transformer
622751

Power Amplifier
898724

Optical Bench
(See Figure 7-1, Part 5)
Note: Long Cell shown.

Resistor
Assembly
622700

F

IGURE

7-4

Micro Board
623785

7-3. M

Rosemount Analytical July 1998

ODEL

880 M

AJOR COMPONENTS

Signal Board
624088

748176-N

)

A. LONG CELLS

g

g

End Cap/Optical Filter
Assembly

Detector
Assembly
(See Figure 7-1,
Part 5)

Desiccant
Holders

Sample In

Sample Out

End Cap
Assembly

Motor/Source Assembly
(See Figure 7-1, Part 2)

O-Rings

EPLACEMENT PARTS

R

Motor/Source Assembly
to Optical Bench Plate
mountin

screws

Detector Cover
removed for clarity

B. SHORT CELLS

Desiccant

Detector
Assembly
(See Figure 7-1,
Part 5

Holder

Detector Cover
removed for clarity

Oscillator
Tune Adjust

Detector
Cover

Oscillator
Tune Adjust

Detector
Cover

Sample In/Out
(interchangeable)

O-Rings

Motor/Source Assembly
to Optical Bench Plate
mountin

Motor/Source Assembly
(See Figure 7-1, Part 2)

End Cap/Filter
Assembly,
Sample Cell to Detector

Cell Assembly

Optical Bench

Cells

Optical Bench

screws

Plate
Assembly

Compression
Gaskets

End Cap/Optical Filters
Assembly

O-Rings

F

IGURE

748176-N

7-4. O

PTICAL BENCH ASSEMBLY

July 1998

Rosemount Analytical

7-5

ODEL

M

880 NON-D

A. LONG CELLS

ISPERSIVE INFRARED ANALYZER

Detector
Cover

Desiccant
Holder

Sample Li ne

B. SHORT CELLS

Detector Assembly

Detector
Cover

Detector
Heater
620298

Detector
Plate

Desiccant
Holder

O-Rings

End Cap/Optical Filter
Assembly

O-Rings

Sample Lines

Cell
Assembly

End Cap/Optical
Filters Assembly

O-Rings

O-Rings

Compression
Gaskets

Sample Li ne

End Cap Assembly

Optical Bench Plate

C. DETECTOR ASSEMBLY

F

IGURE

7-5. D

ETECTOR ASSEMBLY REMOVAL/INSTALLATION

Oscillator Board
623998

Thermal Fuse
898733

Pad

Detector
Base

Detector

Detector
Pad

Pad

Temperature
Sensor
622917

Optical Bench Plate

7-6

Rosemount Analytical July 1998

748176-N

ENERAL PRECAUTIONS FOR HANDLING AND

G

TORING HIGH PRESSURE GAS CYLINDERS

S

Edited from selected paragraphs of the Compressed
Gas Association's "Handbook of Compressed Gases"
published in 1981
Compressed Gas Association
1235 Jefferson Davis Highway
Arlington, Virginia 22202
Used by Permission

1. Never drop cylinders or permit them to strike each other violently.

2. Cylinders may be stored in the open, but in such cases, should be protected against
extremes of weather and, to prevent rusting, from the dampness of the ground. Cylinders
should be stored in the shade when located in areas where extreme temperatures are
prevalent.

3. The valve protection cap should be left on each cylinder until it has been secured
against a wall or bench, or placed in a cylinder stand, and is ready to be used.

4. Avoid dragging, rolling, or sliding cylinders, even for a short distance; they should be
moved by using a suitable hand-truck.

5. Never tamper with safety devices in valves or cylinders.

6. Do not store full and empty cylinders together. Serious suckback can occur when an
empty cylinder is attached to a pressurized system.

7. No part of cylinder should be subjected to a temperature higher than 125°F (52°C). A
flame should never be permitted to come in contact with any part of a compressed gas
cylinder.

8. Do not place cylinders where they may become part of an electric circuit. When electric
arc welding, precautions must be taken to prevent striking an arc against the cylinder.

4125 E

AST LA PALMA AVENUE

• A

Rosemount Analytical Inc.

J

ULY

NAHEIM

ALIFORNIA

1997 • 748525-C • P

, C

92807-1802 • 714-986-7600 • FAX [phone]

RINTED IN

USA

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