Emerson 5081FG Section Troubleshooting, Probe Life, Normal Operational Conditions, Impedance, Ω

Page 71

Model 5081FG

Instruction Manual

IB-106-5081, Rev. 1.0 May 2005

SECTION 6

TROUBLESHOOTING

Install all protective equipment covers and safety ground leads after trouble- shooting. Failure to install covers and ground leads could result in serious injury or death.

6-1 GENERAL

This troubleshooting section describes how to identify and isolate faults that may develop in the Two-Wire In Situ Oxygen Analyzer.

6-2 PROBE LIFE

The zirconium oxide technology for measuring oxygen is very stable and should provide accu- rate service for several years.

Life of the probe is negatively impacted by:

•Continued operation at elevated tempera- tures above 1300°C (2372°F).

•Operation in processes that contain high levels of sulfur, SO2, or other acidic com- pounds.

Operating conditions with simultaneously high levels of SO2 and low levels of O2 are particu- larly damaging.

The health and accuracy of a given cell is closely related to the resistance, or impedance, of the cell. Figure 6-1 illustrates that the amount of output from a cell for a given O2 value (repre- sented as slope) will remain very stable to the point where cell impedance increases to ap- proximately 100 ohms.

SLOPE (mV/Dec)

50

40

30NORMAL OPERATIONAL CONDITIONS

20			mV/Dec
			mV/Dec
10			48.0<S<51
10
0

6

DETERIORATED PERFORMANCE,	DETERIORATED PERFORMANCE,
SLOW RESPONSE,	SLOW RESPONSE,
HIGH MEASUREMENT ERROR	HIGH MEASUREMENT ERROR.
	CONDUCT FREQUENT CALIBRA-
	TION CHECKS.
45.0<S<48mV/Dec	S<45mV/Dec

IMPEDANCE, Ω

26020059

Figure 6-1. Slope vs. Impedance

Rosemount Analytical Inc. A Division of Emerson Process Management

Troubleshooting 6-1

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Contents Model 5081FG Essential Instructions Summary Highlights of ChangesEffective May, 2005 Rev Page Model 5081FG Table of ContentsList of Illustrations List of Tables Model 5081FG Definitions PrefaceModel 5081FG Belangrijk Vigtigt Model 5081FG Tärkeää Model 5081FG Wichtig Importante Viktig Model 5081FG Model 5081FG Viktigt Model 5081FG Component Checklist of Typical System Package Contents Section Description and SpecificationsCode Mounting Adapter Stack Side Product MatrixSystem Description System ConfigurationSystem Overview ScopeSystem Features Handling the Analyzer System Considerations Transmitter Typical System InstallationProbe SpecificationsOperating Load Region Lift OFF Maximum Power Supply VoltageOhms VDCInspect Section InstallationPRE-INSTALLATION Mechanical InstallationSide View Bottom View Front ViewMetal Wall Masonry Wall Stack or Duct Horizontal Probe Installation Adjusting Probe Insertion Depth Model 5081FG Installing Model 5081 Transmitter Mounting Holes Cover LockCircuit Terminal END Block TBElectrical Installation Display Positioning AssemblyThermocouple CELL-WH CELL+BK Model 5081 Transmitter 4-20 mA and Signal ConnectionsTerminal Block Conduit Calibration Check Gas Pneumatic InstallationReference Air Package Instrument Air Reference AirFlow SET MAX Point Knob Mounting Holes Outlet ConnectionOutlet Inlet ConnectionGeneral Power UPSection Startup and Operation Proper Calibration Check Gas Flow Rate Reestablishing Proper Calibration Check GAS Flow RateMenu Tree OperationOverview DisplayProgram DiagnosticsCalcheck MenuNavigation Infrared Remote Control IRCO2 Concentration O2 Concentration Analyzer Access Code Or SecurityAnalyzer Access Code Program MenuCell T HI O2 Concentration Indicator Fault ValueO2 Concentration Upper Cell Temperature Fault Value Upper Range VALSET O2 Filter Time Reset MAX Cell TTo Reset Maximum Cell Temperature O2 Concentration Analyzer Access CodeConcentration SET HI Bottle O2SET LO Bottle O2 Model 5081 Transmitter Parameters SET Code Parameter Range DefaultModel 5081 Transmitter Parameters C mV Diagnostics MenuShow Fault 24. Previous Slope Previous Constant 23. Cell ImpedanceCalcheck Menu Accept LOW O2 27. in MANUAL?29. Accept LOW O2 Slope Model 5081FG Connections Hart Communicator Signal LineSection HART/AMS OverviewAnalog Output Device Method 2, For Load Resistance 250 OhmsMenu Tree for Hart Communicator TWO-WIRE in Situ Oxygen AnalyzerHart Communicator PC OFF-LINE and ON-LINE OperationsDevice Setup From Sheet Basic Setup Detailed From Sheet Signal Condition Detailed Setup Output Hart Communicator Start CAL- Check Method Model 5081FG Spare Board Stack Replacement Section Maintenance and ServiceModel 5081 Electronics Replacement Display Board Replacement Ribbon Cable Analog Board CPU Two-Wire In Situ Oxygen Analyzer Exploded ViewOxygen Probe Replacement Oxygen Probe Terminal Block IMPEDANCE, Ω Section TroubleshootingProbe Life Normal Operational ConditionsSpeed Fault IndicationsOfresponse 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 5081FG Section Return of Material Model 5081FG Index No Part Number Description Replacement PartsReplacement Parts List SectionModel 5081FG Section Index Model 5081FG Model 5081FG Page Warranty Two-Wire In Situ Oxygen Analyzer Serial no Order no