Emerson 3081FG instruction manual Reestablishing Proper Calibration Check GAS Flow Rate

Page 32

Instruction Manual

IB-106-3081 Rev. 1.5 September 2002

Model 3081FG

3-3 REESTABLISHING PROPER CALIBRATION CHECK GAS FLOW RATE

The calibration check gas flow must be enough to ensure no combustion flue gases mix with the calibration check gases and only clean, good calibration check gas surrounds the cell without expending excess gas (Figure 3-3). Monitor the O2 concentration using an IRC or HART Com- municator. Set the calibration check gas flow rate as follows:

NOTE

Only set the calibration check gas flow rate at startup. It is not necessary to perform this procedure for each cali- bration check.

a.Adjust the calibration check gas flow to 5 scfh (2.5 L/min.) to ensure the cell is sur- rounded by calibration check gas. Due to the cooling effect of the gas, the cell tem- perature will decrease slightly, causing the O2 concentration to drop. Once the elec- tronics compensates for this effect, the O2 concentration will stabilize.

b.Next, slowly reduce the calibration check gas flow until the O2 concentration changes, which indicates that the calibration check and flue gases are mixing. Increase the flow rate until this effect is eliminated.

FLUE GAS	STACK OR DUCT
	METAL WALL
	PROTECTIVE
	TUBE
	CELL
CALIBRATION	REFRACTORY
GAS	REFRACTORY
GAS
	CALIBRATION
	CHECK GAS LINE
	REFERENCE
	AIR LINE	26020062

Figure 3-3. Proper Calibration Check Gas Flow Rate

3-2 Startup and Operation

Rosemount Analytical Inc. A Division of Emerson Process Management

Image 32

Contents Model 3081FG Essential Instructions Highlights of Changes Page Table of Contents Model 3081FGList of Illustrations Proper Calibration Check Gas Flow RateList of Tables Model 3081 Transmitter Terminal BlockModel 3081FG Preface DefinitionsModel 3081FG Section Description and Specifications Component Checklist of Typical System Package ContentsProduct Matrix Code Mounting Adapter Stack SideSystem Configuration System OverviewScope System DescriptionSystem Features Handling the Analyzer System Considerations Typical System Installation TransmitterSpecifications ProbeLift OFF Maximum Power Supply Voltage OhmsVDC Operating Load RegionSection Installation PRE-INSTALLATIONMechanical Installation InspectFront View Side View Bottom ViewMetal Wall Masonry Wall Stack or Duct Horizontal Probe Installation Adjusting Probe Insertion Depth Model 3081FG Installing Model 3081 Transmitter Cover Lock Circuit Terminal ENDBlock TB Mounting HolesDisplay Positioning Assembly Electrical InstallationThermocouple CELL-WH CELL+BK Model 3081 Transmitter 4-20 mA and Signal ConnectionsTerminal Block Conduit Pneumatic Installation Reference Air PackageInstrument Air Reference Air Calibration Check GasOutlet Connection OutletInlet Connection Flow SET MAX Point Knob Mounting HolesGeneral Power UPSection Startup and Operation Reestablishing Proper Calibration Check GAS Flow Rate Proper Calibration Check Gas Flow RateOperation OverviewDisplay Menu TreeDiagnostics CalcheckMenu ProgramInfrared Remote Control IRC NavigationO2 Concentration Analyzer Access Code Or Security Analyzer Access CodeProgram Menu O2 ConcentrationO2 Concentration Indicator Fault Value O2 Concentration Upper Cell Temperature Fault ValueUpper Range VAL Cell T HIReset MAX Cell T To Reset Maximum Cell TemperatureO2 Concentration Analyzer Access Code SET O2 Filter TimeConcentration SET HI Bottle O2SET LO Bottle O2 Model 3081 Transmitter Parameters SET Code Parameter Range DefaultModel 3081 Transmitter Parameters C mV Diagnostics MenuShow Fault 23. Cell Impedance 24. Previous Slope Previous ConstantCalcheck Menu SW Build NumberSW Build Date 27. in MANUAL? Accept LOW O229. Accept LOW O2 Slope Model 3081FG Hart Communicator Signal Line Section HART/AMSOverview ConnectionsAnalog Output Device Loop Connectors Method 2, For Load Resistance 250 OhmsTWO-WIRE in Situ Oxygen Analyzer Hart Communicator PCOFF-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 Section Maintenance and Service Model 3081 Electronics ReplacementDisplay Board Replacement PC Board Stack ReplacementTwo-Wire In Situ Oxygen Analyzer Exploded View Oxygen Probe Replacement Oxygen Probe Terminal Block IMPEDANCE, Ω Section TroubleshootingProbe Life Speed Fault IndicationsOfresponse Identifying and Correcting Fault Indications ThermocoupleFault 1, Open Thermocouple Fault 3, Shorted Thermocouple Fault 5, O2 Cell Open Fault 5, O2 Cell Open Fault 6, Cell Impedance Too HighFault 7, Reversed O2 Cell 11. Fault 7, Reversed O2 CellModel 3081FG Section Return of Material Model 3081FG Replacement Parts Replacement Parts ListSection 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