Emerson 3081FG instruction manual Oxygen Probe Replacement

Page 57

Model 3081FG

Instruction Manual

IB-106-3081 Rev. 1.5 September 2002

9.Connect the ribbon cable connector between display board (11) and the CPU board of PC board stack (10). Ensure the cable connector is fully seated.

10.Reposition display board (11) on the standoffs. Rotate the display board 90 degrees either way as desired.

11.Install and tighten all three screws (12) and circuit end cap (13).

12.Tighten cover lock screw (14) until cover lock (15) engages knurled sur- face of circuit end cap (13).

Use heat resistant gloves and clothing when removing the probe. The probe can be as hot as 1600°C (2912°F). This

can cause severe burns.

5-2 OXYGEN PROBE REPLACEMENT

The oxygen probe is designed with ceramic materials to provide maximum life at elevated temperatures and is not rebuildable. The condi- tion of the sensing cell can be determined peri- odically by two methods:

•Note the cell impedance at the electronics. When the impedance displays a warning in- dication (WARN), increase the frequency of impedance readings. A cell with a sustained high impedance indication (HI) indicates a probe that is beyond its useful life.

•Conduct a calibration check. Follow the prompts provided by the electronics through the process of flowing two calibration check

gases of known values. Record the generated slope and constant values.

Probe replacement may be conducted online as long as the process in which the probe is mounted is operating at a negative, or slightly positive, pressure. Refer to Section 6, TROU- BLESHOOTING, for more information.

Do not install or remove probes from a process where pressures are more than a few inches of H2O positive pressure. Hot gases may escape from the stack and cause severe personal injury.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Do not insert or withdraw a probe into

 

5

or out of a hot process faster than 1 in.

 

 

(25.4 mm) per minute or instrument

 

 

damage from thermal shock may

 

 

 

 

occur.

 

 

Also, ash, slag, or other materials can

 

 

build up on the probe body in some

 

 

applications. If this buildup is causing

 

 

difficulty when withdrawing the probe,

 

 

DO NOT FORCE. Rotate the probe

 

 

back and forth to attempt to loosen the

 

 

material on the probe body. Or, wait

 

 

until the process cools down and ac-

 

 

cess the buildup from inside the

 

 

furnace.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Refer to Table 8-1for replacement probe part numbers. Before replacing the probe, verify that the reference air and calibration check gas lines are turned off and disconnected from the probe.

Rosemount Analytical Inc. A Division of Emerson Process Management

Maintenance and Service 5-3

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Contents Model 3081FG Essential Instructions Highlights of Changes Page Model 3081FG Table of ContentsProper Calibration Check Gas Flow Rate List of IllustrationsModel 3081 Transmitter Terminal Block List of TablesModel 3081FG Definitions PrefaceModel 3081FG Component Checklist of Typical System Package Contents Section Description and SpecificationsCode Mounting Adapter Stack Side Product MatrixSystem Overview System ConfigurationScope System DescriptionSystem Features Handling the Analyzer System Considerations Transmitter Typical System InstallationProbe SpecificationsOhms Lift OFF Maximum Power Supply VoltageVDC Operating Load RegionPRE-INSTALLATION Section InstallationMechanical Installation InspectSide View Bottom View Front ViewMetal Wall Masonry Wall Stack or Duct Horizontal Probe Installation Adjusting Probe Insertion Depth Model 3081FG Installing Model 3081 Transmitter Circuit Terminal END Cover LockBlock TB Mounting HolesElectrical Installation Display Positioning AssemblyModel 3081 Transmitter 4-20 mA and Signal Connections Terminal Block ConduitThermocouple CELL-WH CELL+BK Reference Air Package Pneumatic InstallationInstrument Air Reference Air Calibration Check GasOutlet Outlet ConnectionInlet Connection Flow SET MAX Point Knob Mounting HolesPower UP Section Startup and OperationGeneral Proper Calibration Check Gas Flow Rate Reestablishing Proper Calibration Check GAS Flow RateOverview OperationDisplay Menu TreeCalcheck DiagnosticsMenu ProgramNavigation Infrared Remote Control IRCAnalyzer Access Code O2 Concentration Analyzer Access Code Or SecurityProgram Menu O2 ConcentrationO2 Concentration Upper Cell Temperature Fault Value O2 Concentration Indicator Fault ValueUpper Range VAL Cell T HITo Reset Maximum Cell Temperature Reset MAX Cell TO2 Concentration Analyzer Access Code SET O2 Filter TimeSET HI Bottle O2 SET LO Bottle O2Concentration Parameter Range Default Model 3081 Transmitter ParametersModel 3081 Transmitter Parameters SET Code Diagnostics Menu Show FaultC mV 24. Previous Slope Previous Constant 23. Cell ImpedanceSW Build Number SW Build DateCalcheck Menu Accept LOW O2 27. in MANUAL?29. Accept LOW O2 Slope Model 3081FG Section HART/AMS Hart Communicator Signal LineOverview ConnectionsMethod 2, For Load Resistance 250 Ohms Analog Output Device Loop ConnectorsHart Communicator PC TWO-WIRE in Situ Oxygen AnalyzerOFF-LINE and ON-LINE Operations Menu Tree for Hart CommunicatorDevice Setup From Sheet Basic Setup Detailed From Sheet Signal Condition Detailed Setup Output Hart Communicator Start CAL- Check Method Model 3081FG Model 3081 Electronics Replacement Section Maintenance and ServiceDisplay Board Replacement PC Board Stack ReplacementTwo-Wire In Situ Oxygen Analyzer Exploded View Oxygen Probe Replacement Oxygen Probe Terminal Block Section Troubleshooting Probe LifeIMPEDANCE, Ω Fault Indications OfresponseSpeed Thermocouple Identifying and Correcting Fault IndicationsFault 1, Open Thermocouple Fault 3, Shorted Thermocouple Fault 5, O2 Cell Open Fault 6, Cell Impedance Too High Fault 5, O2 Cell Open11. Fault 7, Reversed O2 Cell Fault 7, Reversed O2 CellModel 3081FG Section Return of Material Model 3081FG Replacement Parts List Replacement PartsSection Index No Part Number DescriptionModel 3081FG Section Index Model 3081FG Model 3081FG Page Section Drawings and Schematics Model 3081FG Warranty Two-Wire In Situ Oxygen Analyzer Serial no Order no
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