User ManualTable of ContentsModel 755R Oxygen Analyzer1Essential Instructions2Rosemount Analytical Inc., Process Analytic Division2Table of Contents3List of Illustrations5List of Tables6List of Drawings6Preface7Definitions7Intended Use Statement8Safety Summary8Authorized Personnel8General Precautions for Handling and Storing High Pressure Gas Cylinders10Documentation11Compliances111-0 Description and Specifications131-1 Description131-2 Recorder Output Ranges131-3 Mounting131-4 Isolated Current Output Option131-5 Alarm Option141-6 Electrical Options141-7 Remote Range Change Option141-8 Specifications15a. Performance15b. Sample15c. Electrical16d. Physical162-0 Installation172-1 Facility Preparation17a. Installation Drawings17b. Electrical Interconnection Diagram17c. Flow Diagram17d. Location and Mounting172-2 Calibration Gas Requirements18a. Zero Standard Gas18b. Span Standard Gas182-3 Sample18Basic Requirements for Sample18a. Temperature Requirements18b. Pressure Requirements - General19c. Normal Operation at Positive Gauge Pressures19d. Operation at Negative Gauge Pressures20e. Flow Rate20f. Materials in Contact with Sample20g. Corrosive Gases202-4 Leak Test212-5 Electrical Connections22a. Line Power Connection22b. Recorder Output Selection and Cable Connections22c. Potentiometric Output23d. Isolated Current Output (Optional)23e. Output Connections and Initial Setup for Dual Alarm Option242-6 Remote Range Change Option283-0 Operation293-1 Overview293-2 Operating Range Selection293-3 Startup Procedure293-4 Calibration29a. Calibration with Zero and Span Standard Gases29Set Zero Calibration Point29Set Span Calibration Point303-5 Compensation for Composition of Background Gas30a. Oxygen Equivalent Value of Gases32b. Computing Adjusted Settings for Zero and Span Controls323-6 Selection of Setpoints and Deadband on Alarm Option353-7 Current Output Board (Option)353-8 Routine Operation363-9 Effect of Barometric Pressure Changes on Instrument Readout363-10 Calibration Frequency364-0 Theory374-1 Principles of Operation374-2 Variables Influencing Paramagnetic Oxygen Measurements38a. Pressure Effects384-3 Electronic Circuitry40a. Detector/Magnet Assembly40b. Control Board and Associated Circuitry40Input Amplifier U141Amplifier U2 and Associated Zero Adjustment41Amplifier U4 and Associated Span Adjustment41Amplfier U841Amplifier U1041c. Power Supply Board Assembly41Source Lamp Power Supply Section41+/-15V Power Supply Section42Detector Temperature Control Section42Detector Compartment Temperature Control Section42d. Isolated Current Output Board (Optional)425-0 Circuit Analysis455-1 Circuit Operation455-2 +/-15 VDC Power Supply455-3 Case Heater Control Circuit455-4 Detector Heater Control Circuit505-5 Detecor Light Source Control Circuit515-6 Detector with First Stage Amplifier525-7 Buffer Amplifiers U8 and U10 with Associated Anticipation Function545-8 Digital Output Circuit545-9 Analog Output Circuits for Recorder and Alarms55a. First Stage Amplifier55b. Second Stage Amplifier556-0 Maintenance and Service576-1 Initial Checkout with Standard Gases57Digital display gives correct reading with standard gases, but not with sample gas57Digital display gives correct readings with standard gases, but the alarm or output devices do not57Digital display gives overrange readings with standard gases, as well as sample gas57Digital display gives erratic readings with standard gases, as well as sample gas57a. Control Board Checkout57Voltage57Alarms58Current Output586-2 Heating Circuits58a. Case Heater Control Circuit586-3 Detector/Magnet Heating Circuit586-4 Detector Check60a. Source Lamp61b. Photocell61c. Suspension616-5 Replacement of Detector/Magnet Components61a. Source Lamp61b. Photocell61c. Detector636-6 Control Board Setup63a. Power Supply Test63b. Detector zero63c. U4 Zero64d. U8 Zero64e. U10 Zero64f. Fullscale64g. Recorder Fullscale647-0 Replacement Parts657-1 Circuit Board Replacment Policy657-2 Matrix667-3 Selected Replacement Parts678-0 Return of Material698-1 Return of Material698-2 Customer Service698-3 Training69Warranty71Emerson Process Management - Worldwide72Figures11-1 Model 755R Oxygen Analyzer - Front Panel132-1 Interconnect of Typical Gas Manifold to Model 755R192-2 Model 755R Rear Panel212-3 Connections for Potentiometric Recorder with Non-Standard Span222-4 Model 755R Connected to Drive Several Current Actuated Output Devices232-5 Relay Terminal Connections for Typical Fial-Safe Applications242-6 Typical Alarm Settings262-7 Alarm Relay Assembly Schematic Diagram273-1 Control Board - Adjustment Locations313-2 Dial Settings for Alarm Setpoint Adjustments354-1 Functional Diagram of Paramagnetic Oxygen Measurement System394-2 Spherical Body in Non-Uniform Magnetic Field404-3 Detector/Magnet Assembly435-1 Two-Comparator OR Circuit465-2 Case Heater Control Circuit475-3 Ramp Generator Circuit475-4 Detector Heater Control Circuit505-5 Detector Light Source Control Circuit515-6 Detector with First Stage Amplifier535-7 Buffer, Anticipation, and Digital Output Circuits545-8 Simplified Analog Recorder Output Circuit566-1 Detector/Magnet Assembly596-2 Pin/Lead Removal606-3 Detector Optical Bench606-4 Lamp Replacement62Tables12-1 Remote Range Switching Truth Table283-1 Calibration Range for Various Zero-Based Operating Ranges323-2 Oxygen Equivalent of Common Gases34Drawings1617186 Schematic Diagram, Power Supply Board73620434 Schematic Diagram, Isolated Current Output Board74646090 Schematic Diagram, Remote Range Board75652826 Schematic Diagram, Control Board76654014 Pictorial Wiring Diagram, Model 755R77654015 Installation Drawing, Model 755R78656081 Instructions, Remote Range Selection79Size: 4.58 MBPages: 79Language: EnglishOpen manual