Emerson 3081FG Section HART/AMS, Overview, Hart Communicator Signal Line, Connections, Hart/Ams

Page 47

Model 3081FG

Instruction Manual

IB-106-3081 Rev. 1.5 September 2002

SECTION 4

HART/AMS

4-1 OVERVIEW

The HART Communicator may be interfaced

 

with a personal computer (PC) providing special

The HART Communicator is a handheld com-

software has been installed. To connect the

munications interface device. It provides a

HART Communicator to a PC, an interface

common communications link to all microproc-

adapter is required. Refer to the proper HART

essor-based instruments that are HART com-

Communicator documentation regarding the PC

patible. The handheld communicator contains

interface option.

an 8 x 21 character liquid crystal display (LCD)

 

and 25 keys. A pocket-sized manual, included

4-2 HART COMMUNICATOR SIGNAL LINE

with the HART Communicator, details the spe-

CONNECTIONS

cific functions of all the keys.

4

 

To interface with the Two-Wire In Situ Oxygen Analyzer, the HART Communicator requires a termination point along the 4-20 mA current loop and a minimum load resistance of 250 ohms between the communicator and the power sup- ply. The HART Communicator accomplishes its task using a frequency shift keying (FSK) tech- nique. With the use of FSK, high-frequency digital communication signals are superimposed on the 4-20 mA transmitter current loop. The communicator does not disturb the 4-20 mA signal since no net energy is added to the loop.

The HART Communicator can connect to the Two-Wire In Situ Oxygen Analyzer analog out- put signal line at any wiring termination in the 4- 20 mA current loop. There are two methods of connecting the HART Communicator to the sig- nal line. For applications in which the signal line has a load resistance of 250 ohms or more, re- fer to method 1 and Figure 4-1.For applications in which the signal line load resistance is less than 250 ohms, refer to method 2 and Figure 4-2.

Rosemount Analytical Inc. A Division of Emerson Process Management

HART/AMS 4-1

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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 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 3081FG Installing Model 3081 Transmitter Mounting Holes Cover LockCircuit Terminal END Block TBElectrical Installation Display Positioning AssemblyThermocouple CELL-WH CELL+BK Model 3081 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 3081 Transmitter Parameters SET Code Parameter Range DefaultModel 3081 Transmitter Parameters C mV Diagnostics MenuShow Fault 24. Previous Slope Previous Constant 23. Cell ImpedanceCalcheck Menu SW Build NumberSW Build Date Accept LOW O2 27. in MANUAL?29. Accept LOW O2 Slope Model 3081FG Connections Hart Communicator Signal LineSection HART/AMS OverviewMethod 2, For Load Resistance 250 Ohms Analog Output Device Loop ConnectorsMenu 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 3081FG PC Board Stack Replacement Section Maintenance and ServiceModel 3081 Electronics Replacement Display Board ReplacementTwo-Wire In Situ Oxygen Analyzer Exploded View Oxygen Probe Replacement Oxygen Probe Terminal Block IMPEDANCE, Ω Section TroubleshootingProbe Life Speed 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 3081FG Section Return of Material Model 3081FG Index No Part Number Description Replacement PartsReplacement Parts List SectionModel 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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