Rosemount 755A Manuale utente
Rosemount Analytical
MODEL 755A
OXYGEN ANALYZER
INSTRUCTION MANUAL
245364-U
NOTICE
The information contained in this document is subject to change without notice.
Manual Part Number 245364-U
April 2000
Printed in U.S.A.
Rosemount Analytical Inc.
4125 East La Palma Avenue
Anaheim, California 92807-1802
Teflon® is a registered trademark of E.I. duPont de Nemours and Co., Inc.
SNOOP® is a registered trademark of NUPRO Co.
CONTENTS
245364-U Rosemount Analytical April 2000 i
Model 755A Oxygen Analyzer
PREFACE
INTENDED USE STATEMENT ............................................................................P-1
SAFETY SUMMARY ............................................................................................P-1
SPECIFICATIONS - GENERAL ...........................................................................P-3
SPECIFICATIONS - SAMPLE..............................................................................P-3
SPECIFICATIONS - ELECTRICAL.......................................................................P-4
SPECIFICATIONS - PHYSICAL...........................................................................P-5
CUSTOMER SERVICE, TECHNICAL ASSISTANCE AND FIELD SERVICE......P-6
RETURNING PARTS TO THE FACTORY...........................................................P-6
TRAINING ........................................................................................................P-6
DOCUMENTATION..............................................................................................P-6
COMPLIANCES ...................................................................................................P-7
SECTION 1. INTRODUCTION
1.1 OVERVIEW ..............................................................................................1-1
1.2 OXYGEN RANGE ON FRONT PANEL DIGITAL DISPLAY.....................1-2
1.3 OXYGEN RANGES FOR RECORDER READOUT..................................1-2
1.4 RECORDER VOLTAGE AND CURRENT OUTPUTS..............................1-3
1.5 AUTOMATIC PRESSURE COMPENSATION..........................................1-3
1.6 ALARM (OPTION)....................................................................................1-3
1.7 CASE MOUNTING OPTIONS ...................................................................1-3
1.8 ELECTRICAL POWER OPTIONS............................................................1-3
SECTION 2. UNPACKING AND INSTALLATION
2.1 UNPACKING ............................................................................................2-1
2.2 LOCATION ...............................................................................................2-1
CONTENTS
ii April 2000 Rosemount Analytical 245364-UModel 755A Oxygen Analyzer
SECTION 2. (CONTINUED)
2.2.1 Location and Mounting............................................................... 2-1
2.3 VOLTAGE REQUIREMENTS .................................................................. 2-1
2.4 ELECTRICAL CONNECTIONS................................................................ 2-2
2.4.1 Line Power Connections............................................................. 2-2
2.4.2 Recorder Connections................................................................ 2-2
2.4.3 Output Connections for Dual Alarm Option ................................ 2-5
2.5 CALIBRATION......................................................................................... 2-8
2.5.1 Zero Calibration Gas .................................................................. 2-8
2.5.2 Downscale Standard Gas........................................................... 2-8
2.5.3 Upscale Standard Gas ............................................................... 2-8
2.6 SAMPLE HANDLING............................................................................... 2-8
2.6.1 Sample Temperature Requirements........................................... 2-8
2.6.2 Sample Pressure Requirements: General................................. 2-9
2.6.3 Normal Operation at Positive Gauge Pressures......................... 2-10
2.6.4 Operation at Negative Gauge Pressures.................................... 2-10
2.6.5 Sample Flow Rate...................................................................... 2-10
2.6.6 Corrosive Gases........................................................................ 2-11
2.7 LEAK TEST.............................................................................................. 2-11
2.8 PURGE KIT (OPTIONAL) ........................................................................ 2-12
SECTION 3. INITIAL STARTUP AND CALIBRATION
3.1 SELECTION OF RECORDER OXYGEN RANGE ................................... 3-1
3.1.1 Recorder Oxygen Range Selection Procedure........................... 3-1
3.1.2 Readout of Applied Zero-Suppression Voltage on
Digital Display............................................................... 3-5
3.2 STARTUP PROCEDURE......................................................................... 3-6
3.3 CALIBRATION......................................................................................... 3-7
3.3.1 Calibration Using Digital Readout for Oxygen Readout.............. 3-7
3.3.2 Calibration Using Recorder for Oxygen Readout ....................... 3-7
3.3.3 Calibration with Downscale and Upscale Standard Gases......... 3-8
3.3.4 Calibration of Automatic Pressure Compensation...................... 3-9
3.4 COMPENSATION FOR COMPOSITION OF BACKGROUND GAS........ 3-10
3.4.1 Oxygen Equivalent Values of Gases.......................................... 3-11
3.4.2 Computing Adjusted Settings for Zero and Span Controls......... 3-11
3.5 DUAL ALARM OPTION ........................................................................... 3-13
3.5.1 Inital Calibration and Selection of Setpoints for Alarms.............. 3-13
3.5.2 Selection of Deadband............................................................... 3-14
CONTENTS
245364-U Rosemount Analytical April 2000 iii
Model 755A Oxygen Analyzer
SECTION 4. ROUTINE OPERATION
4.1 ROUTINE OPERATION ...........................................................................4-1
4.2 EFFECT OF BAROMETRIC PRESSURE CHANGES ON
INSTRUMENT READOUT............................................................4-1
4.3 CALIBRATION FREQUENCY ..................................................................4-1
SECTION 5. THEORY
5.1 PRINCIPLES OF OPERATION ................................................................5-1
5.2 VARIABLES INFLUENCING PARAMAGNETIC OXYGEN
MEASUREMENTS........................................................................5-5
5.2.1 Pressure Effects..........................................................................5-5
5.2.2 Temperature Effects....................................................................5-5
5.2.3 Interferents.................................................................................5-6
5.2.4 Vibration Effects..........................................................................5-6
5.3 ELECTRONIC CIRCUITRY......................................................................5-6
5.3.1 Detector/Magnet Assembly.........................................................5-7
5.3.2 Control Board and Associated Circuitry ......................................5-7
5.3.3 Case Board.................................................................................5-9
5.3.4 Isolated Current Output Board (Optional)....................................5-10
5.3.5 Alarm Option...............................................................................5-10
SECTION 6. ELECTRONIC CIRCUIT ANALYSIS
6.1 OVERVIEW ..............................................................................................6-1
6.2 ±15VDC POWER SUPPLY.......................................................................6-1
6.3 CASE HEATER CONTROL CIRCUIT ......................................................6-1
6.4 DETECTOR HEATER CONTROL CIRCUIT ............................................6-6
6.5 DETECTOR LIGHT SOURCE CONTROL CIRCUIT................................6-7
6.6 DETECTOR WITH FIRST STAGE AMPLIFIER AND PRESSURE
COMPENSATION CIRCUITS.......................................................6-8
6.7 BUFFER AMPLIFIERS U10 AND ASSOCIATED ANTICIPATION
FUNCTION....................................................................................6-12
6.8 DIGITAL OUTPUT CIRCUIT.....................................................................6-12
6.9 ANALOG OUTPUT CIRCUITS FOR RECORDER AND ALARMS...........6-13
CONTENTS
iv April 2000 Rosemount Analytical 245364-UModel 755A Oxygen Analyzer
SECTION 7. ROUTINE SERVICE AND MAINTENANCE
7.1 INITIAL CHECKOUT WITH STANDARD GASES.................................... 7-1
7.2 DETECTOR COMPONENT CHECKS..................................................... 7-2
7.2.1 Detector ..................................................................................... 7-2
7.2.2 Source Lamp.............................................................................. 7-2
7.2.3 Photocell..................................................................................... 7-2
7.2.4 Suspension................................................................................. 7-3
7.3 DETECTOR COMPONENT REPLACEMENT ......................................... 7-3
7.3.1 Detector Replacement................................................................ 7-3
7.3.2 Source Lamp Replacement........................................................ 7-5
7.3.3 Photocell Replacement and Adjustment..................................... 7-7
7.4 HEATING CIRCUITS............................................................................... 7-8
7.4.1 Case Heater Control Circuit........................................................ 7-8
7.4.2 Detector/Magnet Heating Circuit ................................................ 7-9
SECTION 8. REPLACEMENT PARTS
8.1 CIRCUIT BOARD REPLACEMENT POLICY........................................... 8-1
8.2 SELECTED REPLACEMENT PARTS ..................................................... 8-1
GENERAL PRECAUTIONS FOR STORING AND HANDLING HIGH PRESSURE GAS CYLINDERS
WARRANTY
FIELD SERVICE AND REPAIR FACILITIES
CONTENTS
245364-U Rosemount Analytical April 2000 v
Model 755A Oxygen Analyzer
FIGURES
1-1 Model 755A Oxygen Analyzer..................................................................1-1
1-2 Analyzer Components and Adjustments Locations ..................................1-4
2-1 Electrical Connections..............................................................................2-3
2-2 Control Board ...........................................................................................2-4
2-3 Connections for Potentiometric Recorder with Non-Standard Span.........2-4
2-4 Analyzer Connected to Drive Several Current-Activated Output
Devices .........................................................................................2-5
2-5 Typical Alarm Settings..............................................................................2-7
2-6 Relay Terminal Connections for Typical Fail-Safe Application.................2-7
2-7 Connection of Typical Gas Selector Panel to Analyzer ............................2-9
2-8 Installation of Purge Kit (Optional)............................................................2-13
3-1 Front Panel Controls.................................................................................3-2
3-2 Internal Adjustments Locations.................................................................3-5
3-3 Calibration by Pressure Decrease Setup..................................................3-9
3-4 Schematic Circuit of Alarm Relay Assembly.............................................3-14
5-1 Spherical Body in Non-Uniform Magnetic Field........................................5-2
5-2 Functional Diagram of Paramagnetic Oxygen Measurement System ......5-3
5-3 Detector/Magnet Assembly.......................................................................5-4
6-1 Two-Comparator OR Circuit.....................................................................6-2
6-2 Ramp Generator.......................................................................................6-3
6-3 Case Heater Control Circuit......................................................................6-4
6-4 Case Heater Circuit..................................................................................6-5
6-5 Detector Heater Control Circuit.................................................................6-7
6-6 Detector Light Source Control Circuit.......................................................6-8
6-7 Detector with First Stage Amplifier and Pressure Compensation
Circuits..........................................................................................6-11
6-8 Pressure Signal and Reference Voltage Circuits......................................6-11
6-9 Buffer, Anticipation, and Digital Output Circuit..........................................6-12
6-10 Simplified Analog Output Circuit for Recorder (Showing Three
Ranges).........................................................................................6-15
7-1 Detector/Magnet Assembly.......................................................................7-4
7-2 Detector/Magnet Assembly Wiring ...........................................................7-5
7-3 Detector Adjustment.................................................................................7-5
7-4 Modifiication of 633689 Connector Board for Compatibility with
Replacement Lamp.......................................................................7-7
7-5 Lamp Alignment.........................................................................................7-7
TABLES
3-1 Internal Adjustments.................................................................................3-4
3-2 Standard Gases Recommended for Calibration of Various Oxygen
Ranges on Analog Output.............................................................3-8
3-3 Oxygen Equivalents of Common Gases...................................................3-12
CONTENTS
vi April 2000 Rosemount Analytical 245364-UModel 755A Oxygen Analyzer
DRAWINGS (LOCATED IN REAR OF MANUAL)
617186 Schematic Diagram, Master Board Assembly (Case)
617731 Pictorial Wiring Diagram, Model 755A
620434 Schematic Diagram, 0 to 20 mA or 4 to 20 mA Current Output
632349 Installation Drawing, Model 755A
652219 Schematic Diagram, Control Board
652222 Schematic Diagram, Transducer
PREFACE
245364-U Rosemount Analytical April 2000 P-1
Model 755A Oxygen Analyzer
INTENDED USE STATEMENT
The Model 755A is intended for use as an industrial process measurement device
only. It is not intended for use in medical, diagnostic, or life support applications, and
no independent agency certifications or approvals are to be implied as covering such
applications.
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
755A Oxygen 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.
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.
WARNING: ELECTRICAL SHOCK HAZARD
PREFACE
P-2 April 2000 Rosemount Analytical 245364-UModel 755A Oxygen Analyzer
WARNING: POSSIBLE EXPLOSION HAZARD
WARNING: HIGH PRESSURE GAS CYLINDERS
CAUTION: PARTS INTEGRITY
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-496-1086
(Chapter 8) or IEC Publication 79-2-1983 (Section Three).
If gases are introduced into this analyzer, the sample containment system must
be carefully leak-checked upon installation and before initial start-up, 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 2.7.
Internal leakage of sample resulting from failure to observe these precautions
could result in an explosion causing death, personal injury, or property damage.
Tampering or unauthorized substitution of components may adversely affect
safety of this product. Use only factory documented components for repair.
This analyzer requires periodic calibration with known zero and standard gases.
Refer to Sections 2.5 and 2.6. See also General Precautions for Handling and
Storing High Pressure Cylinders, in the rear of this manual.
Indice
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