Rosemount 848T Multisensor Transmitter Temperature
Reference Manual00809-0100-4697, Rev CAJanuary 2005Rosemount 848T Multisensor TransmitterTemperature Inputswith FOUNDATION FieldbusDevice Revision 5U.S. Patent Number 6,574,515www.rosemount.com
Reference Manual00809-0100-4697, Rev CAJanuary 2005Rosemount 848TTable of ContentsSECTION 1IntroductionSafety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2Transmitter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2Service Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3SECTION 2InstallationSafety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1Mounting to a DIN Rail Without an Enclosure. . . . . . . . . . . . . . . . . . . . . 2-2Mounting to a Panel with a Junction Box . . . . . . . . . . . . . . . . . . . . . . . . 2-2Mounting to a 2-Inch Pipe Stand. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3Wiring. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4Connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7Surges/Transients . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10Tagging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-11Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12Using Cable Glands . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12Using Conduit Entries . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-12SECTION 3ConfigurationSafety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2Standard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2Transmitter Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2Custom Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3Damping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3Configure the Differential Sensor Blocks . . . . . . . . . . . . . . . . . . . . . . . . 3-3Common Configurations for Monitoring Applications. . . . . . . . . . . . . . . . . . 3-4Interfacing Analog Transmitters to Foundation fieldbus . . . . . . . . . . . . . 3-6Block Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7Resource Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7PlantWeb Alerts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12Recommended Actions for PlantWeb Alerts . . . . . . . . . . . . . . . . . . . . . 3-15Transducer Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-15Measurement Transducer Block (MTB) . . . . . . . . . . . . . . . . . . . . . . . . 3-17Sensor Transducer Block (STB) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-21Differential Transducer Block (DTB) . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-22www.rosemount.com
Reference ManualRosemount 848T00809-0100-4697, Rev CAJanuary 2005SECTION 4Operation andMaintenanceSafety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1Foundation Fieldbus Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1Commissioning (Addressing) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2Hardware Maintenance . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3Sensor Check . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3Communication/Power Check. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3Resetting the Configuration (RESTART) . . . . . . . . . . . . . . . . . . . . . . . . 4-3Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4Foundation Fieldbus . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4Resource Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4Measurement Transducer Block Troubleshooting . . . . . . . . . . . . . . . . . 4-5Sensor Transducer Block Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . 4-5Differential Transducer Block Troubleshooting . . . . . . . . . . . . . . . . . . . . 4-5APPENDIX AReference DataFunctional Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-1Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-3Function Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-4Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-4Dimensional Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-7Mounting Options . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-10Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-11APPENDIX BProduct CertificatesHazardous Locations Certificates . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-1North American Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-1European Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-3Australian Approvals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-5Brazilian Approval . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-5Intrinsically Safe and Non-Incendive Installations . . . . . . . . . . . . . . . . . . . .B-6Installation Drawings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-7APPENDIX CFoundation FieldbusTechnologyOverview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-1Function Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-1Device Descriptions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-3Block Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-3Instrument- Specific Function Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . .C-3Alerts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-3Network Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-4Link Active Scheduler (LAS) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-4Addressing . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-6Scheduled Transfers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-6Unscheduled Transfers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-7Function Block Scheduling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-8APPENDIX DFunction BlocksAnalog Input (AI) Function Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-1Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-3AI Block Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-8Multiple Analog Input (MAI) Function Block. . . . . . . . . . . . . . . . . . . . . . . . .D-9Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-10MAI Block Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-14Input Selector Function Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-15Functionality . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-17ISEL Block Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-20TOC-2
Reference Manual00809-0100-4697, Rev CAJanuary 2005Rosemount 848TRosemount 848T Eight InputTemperature Transmitter withFOUNDATION FieldbusNOTICERead this manual before working with the product. For personal and system safety, and foroptimum product performance, make sure to thoroughly understand the contents beforeinstalling, using, or maintaining this product.The United States has two toll-free assistance numbers and one international number.Customer Central1-800-999-9307 (7:00 a.m. to 7:00 P.M. CST)National Response Center1-800-654-7768 (24 hours a day)Equipment service needsInternational1-(952) 906-8888The products described in this document are NOT designed for nuclear-qualifiedapplications.Using non-nuclear qualified products in applications that require nuclear-qualified hardwareor products may cause inaccurate readings.For information on Rosemount nuclear-qualified products, contact a Emerson ProcessManagement Sales Representative.Rosemount 848T Eight Input Temperature Transmitter with FOUNDATION fieldbus may beprotected by one or more U.S. patents pending. Other foreign patents pending.Cover photo: 848-848C004www.rosemount.com
Reference Manual00809-0100-4697, Rev CAJanuary 2005Section 1Rosemount 848TIntroductionSafety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1-1Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1-2Service Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 1-3SAFETY MESSAGESInstructions and procedures in this section may require special precautions toensure the safety of the personnel performing the operations. Information thatpotentially raises safety issues is indicated by a warning symbol ( ). Pleaserefer to the following safety messages before performing an operationpreceded by this symbol.WarningsFailure to follow these installation guidelines could result in death orserious injury. Make sure only qualified personnel perform the installation.Process leaks could result in death or serious injury. Do not remove the thermowell while in operation. Removing while in operation maycause process fluid leaks. Install and tighten thermowells and sensors before applying pressure, or processleakage may result.Electrical shock could cause death or serious injury.www.rosemount.com If the senor is installed in a high voltage environment and a fault condition orinstallation error occurs, high voltage may be present on transmitter leads andterminals. Use extreme caution when making contact with the leads and terminals.
Reference Manual00809-0100-4697, Rev CAJanuary 2005Rosemount 848TOVERVIEWTransmitterThe Rosemount 848T is optimal for process temperature monitoring becauseof its ability to simultaneously measure eight separate and independenttemperature points with one transmitter. Multiple temperature sensor typesmay be connected to each 848T transmitter. In addition, the 848T can accept4-20 mA inputs. The enhanced measurement capability of the 848T allows itto communicate these variables to any FOUNDATION fieldbus host orconfiguration tool.The new Rosemount 3420 Fieldbus Interface Module will interface the 848Toutputs to systems without fieldbus capability using the standard interfaceprotocols. Contact a local Emerson Process Management SalesRepresentative for more information.ManualThis manual is designed to assist in the installation, operation, andmaintenance of the Rosemount 848T Temperature Transmitter.Section 1: Introduction Overview Considerations Return of MaterialsSection 2: Installation Mounting Installation Wiring Power Supply CommissioningSection 3: Configuration FOUNDATION fieldbus Technology Configuration Function Block ConfigurationSection 4: Operation and Maintenance Hardware Maintenance Troubleshooting1-2
Reference Manual00809-0100-4697, Rev CAJanuary 2005Rosemount 848TAppendix A: Specification and Reference Data Specifications Dimensional Drawings Ordering InformationAppendix B: Product Certificates Hazardous Locations Certificates Intrinsically Safe and Non-Incendive Installations Installation DrawingsAppendix C: Foundation Fieldbus Technology Device Descriptions Block OperationAppendix D: Function Blocks Analog Input (AI) Function Block Multiple Analog Input (MAI) Function Block Input Selector Function BlockSERVICE SUPPORTTo expedite the return process in North America, call the Emerson ProcessManagement National Response Center toll-free at 800-654-7768. Thiscenter, available 24 hours a day, will assist with any needed information ormaterials.The center will ask for the following information: Product model Serial numbers The last process material to which the product was exposedThe center will provide A Return Material Authorization (RMA) number Instructions and procedures that are necessary to return goods thatwere exposed to hazardous substancesFor other locations, please contact a Emerson Process Management salesrepresentative.NOTEIf a hazardous substance is identified, a Material Safety Data Sheet (MSDS),required by law to be available to people exposed to specific hazardoussubstances, must be included with the returned materials.1-3
Reference ManualRosemount 848T1-400809-0100-4697, Rev CAJanuary 2005
Reference Manual00809-0100-4697, Rev CAJanuary 2005Section 2Rosemount 848TInstallationSafety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-1Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-1Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-4Grounding . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-8Switches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-10Tagging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-11Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . page 2-12SAFETY MESSAGESInstructions and procedures in this section may require special precautions toensure the safety of the personnel performing the operations. Information thatpotentially raises safety issues is indicated by a warning symbol ( ). Pleaserefer to the following safety messages before performing an operationpreceded by this symbol.WarningsFailure to follow these installation guidelines could result in death orserious injury. Make sure only qualified personnel perform the installation.Process leaks could result in death or serious injury. Do not remove the thermowell while in operation. Removing while in operation maycause process fluid leaks. Install and tighten thermowells and sensors before applying pressure, or processleakage may result.Electrical shock could cause death or serious injury.MOUNTINGwww.rosemount.com If the senor is installed in a high voltage environment and a fault condition orinstallation error occurs, high voltage may be present on transmitter leads andterminals. Use extreme caution when making contact with the leads and terminals.The 848T is always mounted remote from the sensor assembly. There arethree mounting configurations: To a DIN rail without an enclosure To a panel with an enclosure To a 2-in pipe stand with an enclosure using a pipe mounting kit
Reference Manual00809-0100-4697, Rev CAJanuary 2005Rosemount 848TMounting to a DIN RailWithout an EnclosureTo mount the 848T to a DIN rail without an enclosure, follow these steps:1.Pull up the DIN rail mounting clip located on the top back side of thetransmitter.2.Hinge the DIN rail into the slots on the bottom of the transmitter.3.Tilt the 848T and place onto the DIN rail. Release the mounting clip.The transmitter should be securely fastened to the DIN rail.Figure 2-1. Mounting the 848Tto a DIN Rail848T withoutinstalled enclosureDIN Rail Mounting ClipDIN RailMounting to a Panel witha Junction BoxWhen inside of a plastic or aluminum junction box, the 848T mounts to apanel using four 1/4-20 x 1.25-in. screws.When inside of a stainless steel junction box, the 848T mounts to a panelusing two 1/4-20 x 1/2-in. screws.Figure 2-2. Mounting the 848Tjunction box to a panelAluminum/PlasticStainless Steel848T with aluminum or plastic boxCoverScrews (4)848T with a stainless steel boxMountingScrews (2)MountingScrews (4)Panel2-2Panel
Reference Manual00809-0100-4697, Rev CAJanuary 2005Use the optional mounting bracket (option code B6) to mount the 848T to a2-inch pipe stand when using a junction box.Front View5.1(130)10.2(260)Side View6.6 (167)fullyassembledStainless Steel Junction Box(style JS)Front View4.5(114)Side View848 848A52A, B, 53A, BAluminum/Plastic Junction Box(styles JA and JP)7.5 (190)fullyassembledDimensions are in inches (millimeters)Aluminum/Plastic Junction BoxMounted on a Vertical PipeStainless Steel Junction BoxMounted on a Vertical Pipe848 848A54A, 55AMounting to a 2-InchPipe StandRosemount 848T2-3
Reference Manual00809-0100-4697, Rev CAJanuary 2005WIRINGRosemount 848TIf the sensor is installed in a high-voltage environment and a fault condition orinstallation error occurs, the sensor leads and transmitter terminals couldcarry lethal voltages. Use extreme caution when making contact with theleads and terminals.NOTEDo not apply high voltage (e.g. AC line voltage) to the transmitter terminals.Abnormally high voltage can damage the unit (bus terminals are rated to 42.4VDC).Figure 2-3. 848T TransmitterField Wiring6234 ft (1900 m) max(depending upon cablecharacteristics)Integrated PowerConditionerand FilterTerminators(Trunk)FOUNDATIONfieldbus Host orconfiguration toolSignalWiringDevices 1 through 16*848-848 01A(Spur)(Spur)PowerSupply* Intrinsically safe installations may allow fewer devices per I.S. barrierConnectionsThe 848T transmitter is compatible with 2 or 3-wire RTD, thermocouple, Ohm,and millivolt sensor types. Figure 2-4 shows the correct input connections tothe sensor terminals on the transmitter. The 848T can also accept inputs fromanalog devices using the optional analog input connector. Figure 2-5 showsthe correct input connections to the analog input connector when installed onthe transmitter. Tighten the terminal screws to ensure proper connection.Figure 2-4. Sensor WiringDiagram1 2 32-wireRTD andOhms1 2 33-wireRTD andOhms*-1 2 3Thermocouples /Ohms andMillivolts848-0000A01A 1 2 32-Wire RTDwithCompensationLoop**The wiring of 3-wire RTDs for this unit is different than some earlier models ofthe 848T. Pay careful attention to the wiring diagram on the label especially ifthis unit is replacing an older unit.2-4
Reference Manual00809-0100-4697, Rev CAJanuary 2005Rosemount 848TRTD or Ohm InputsVarious RTD configurations, including 2-wire and 3-wire are used in industrialapplications. If the transmitter is mounted remotely from a 3-wire RTD, it willoperate within specifications, without recalibration, for lead wire resistances ofup to 60 ohms per lead (equivalent to 6,000 feet of 20 AWG wire). If using a2-wire RTD, both RTD leads are in series with the sensor element, so errorscan occur if the lead lengths exceed one foot of 20 AWG wire. Compensationfor this error is provided when using 3-wire RTDs.Thermocouple or Millivolt InputsUse appropriate thermocouple extension wire to connect the thermocouple tothe transmitter. Make connections for millivolt inputs using copper wire. Useshielding for long runs of wire.Analog InputsThe analog connector converts the 4–20 mA signal to a 20–100 mV signal.The 848T transmitter uses a standard mV sensor type to output the scaled 4–20 mA signal onto the FOUNDATION fieldbus.Use the following steps when installing the 848T with the analog connector:1. The 848T, when ordered with option code S002, comes with four analogconnectors. Replace the standard connector with the analog connectoron the desired channels.2. Wire one or two analog transmitters to the analog connector according toFigure 2-5. There is space available on the analog connector label foridentification of the analog inputs.NOTEPower supply should be rated to support the connected transmitter(s).3. If the analog transmitters can communicate using HART protocol, theanalog connectors are supplied with the ability to switch in a 250 ohmresistor for HART communication (see Figure 2-6).One switch is supplied for each input (top switch for “A” inputs andbottom switch for “B” inputs). Setting the switch in the “ON” position (tothe right) bypasses the 250 ohm resistor. Terminals are provided for eachanalog input to connect a HART communicator for local configuration.2-5
Reference Manual00809-0100-4697, Rev CAJanuary 2005Rosemount 848TFigure 2-5. 848T Analog InputWiring DiagramAnalog InputConnectorsAnalog Transmitters848/848A64A.EPSPower SupplyFigure 2-6. 848T AnalogConnector250 ohm resistor in the loop when switched to the leftHARTChannel BHARTChannel ASpace available foridentification of inputs2-6
Reference Manual00809-0100-4697, Rev CAJanuary 2005Power SupplyRosemount 848TConnectionsThe transmitter requires between 9 and 32 VDC to operate and providecomplete functionality. The dc power supply should provide power with lessthan 2% ripple. A fieldbus segment requires a power conditioner to isolate thepower supply filter and decouple the segment from other segments attachedto the same power supply.All power to the transmitter is supplied over the signal wiring. Signal wiringshould be shielded, twisted pair for best results in electrically noisyenvironments. Do not use unshielded signal wiring in open trays with powerwiring or near heavy electrical equipment.Use ordinary copper wire of sufficient size to ensure that the voltage across thetransmitter power terminals does not go below 9 VDC. The power terminals arepolarity insensitive. To power the transmitter:1.Connect the power leads to the terminals marked “Bus,” as shown inFigure 2-7.2.Tighten the terminal screws to ensure adequate contact. Noadditional power wiring is necessary.Figure 2-7. Transmitter LabelGround(required with T1 option)Connect Power Leads HereSurges/Transients848A65A.EPSNOT USEDSECURITYSIMULATE ENABLEThe transmitter will withstand electrical transients encountered through staticdischarges or induced switching transients. However, a transient protectionoption (option code T1) is available to protect the 848T against high-energytransients. The device must be properly grounded using the ground terminal(see Figure 2-7 on page 2-7).2-7
Reference Manual00809-0100-4697, Rev CAJanuary 2005GROUNDINGRosemount 848TThe 848T transmitter provides input/output isolation up to 500 VAC rms.NOTENeither conductor of the fieldbus segment can be grounded. Grounding outone of the signal wires will shut down the entire fieldbus segment.Shielded WireEach process installation has different requirements for grounding. Use thegrounding options recommended by the facility for the specific sensor type orbegin with grounding option 1 (most common).Ungrounded Thermocouple, mV, and RTD/Ohm InputsOption 1:1.Connect signal wiring shield to the sensor wiring shield(s).2.Ensure the shields are tied together and electrically isolated from thetransmitter enclosure.3.Only ground shield at the power supply end.4.Ensure that the sensor shield(s) is electrically isolated from thesurrounding grounded fixtures.848TPowerSupplySensor WiresShield ground pointOption 2:1.Connect sensor wiring shield(s) to the transmitter enclosure (only ifthe enclosure is grounded).2.Ensure the sensor shield(s) is electrically isolated from surroundingfixtures that may be grounded.3.Ground signal wiring shield at the power supply end.848TPowerSupplySensor WiresShield ground points2-8
Reference Manual00809-0100-4697, Rev CAJanuary 2005Rosemount 848TGrounded Thermocouple Inputs1.Ground sensor wiring shield(s) at the sensor.2.Ensure that the sensor wiring and signal wiring shields are electricallyisolated from the transmitter enclosure.3.Do not connect the signal wiring shield to the sensor wiring shield(s).4.Ground signal wiring shield at the power supply end.PowerSupply848TSensor WiresShield ground pointsAnalog Device Inputs1.Ground analog signal wire at the power supply of the analog devices.2.Ensure that the analog signal wire and the fieldbus signal wire shieldsare electrically isolated from the transmitter enclosure.3.Do not connect the analog signal wire shield to the fieldbus signalwire shield.4.Ground fieldbus signal wire shield at the power supply end.Foundationfieldbus bus4-20 mA loopAnalog DevicePower SupplyAnalogDevice848TPowerSupplyShield ground pointsTransmitter Enclosure (optional)Ground the transmitter in accordance with local electrical requirements.2-9
Reference Manual00809-0100-4697, Rev CAJanuary 2005Rosemount 848TSWITCHESFigure 2-8. Switch Location onthe Rosemount 848T848A65A.EPSNOT USEDSECURITYSIMULATE ENABLESecurityAfter configuring the transmitter, the data can be protected from unwarrantedchanges. Each 848T is equipped with a security switch that can be positioned“ON” to prevent the accidental or deliberate change of configuration data.This switch is located on the front side of the electronics module andis labeled SECURITY.See Figure 2-8 on page 2-10 for switch location on the transmitter label.Simulate EnableThe switch labeled SIMULATE ENABLE is used in conjunction with theAnalog Input (AI) and Multiple Analog Input (MAI) function blocks. This switchis used to simulate temperature measurement. As a lock-out feature, theswitch must transition from “OFF” to “ON” after power is applied to thetransmitter. This feature prevents the transmitter from being left in simulatormode.Not UsedThe switch is not functional.2-10
Reference Manual00809-0100-4697, Rev CAJanuary 2005TAGGINGRosemount 848TCommissioning TagThe 848T has been supplied with a removable commissioning tag thatcontains both the Device ID (the unique code that identifies a particular devicein the absence of a device tag) and a space to record the device tag (theoperational identification for the device as defined by the Piping andInstrumentation Diagram (P&ID)).When commissioning more than one device on a fieldbus segment, it can bedifficult to identify which device is at a particular location. The removable tag,provided with the transmitter, can aid in this process by linking the Device IDto its physical location. The installer should note the physical location of thetransmitter on both the upper and lower location of the commissioning tag.The bottom portion should be torn off for each device on the segment andused for commissioning the segment in the control system.Figure 2-9. Commissioning TagDevice IDDevice Tagto denotephysicallocationTransmitter TagHardware tagged in accordance with customer requirements permanently attached to the transmitterSoftware the transmitter can store up to 30 characters if no characters are specified, the first 30 characters of the hardware tagwill be usedSensor TagHardware a plastic tag is provided to record identification of eight sensors this information can be printed at the factory upon request in the field, the tag can be removed, printed onto, and reattached to thetransmitterSoftware if sensor tagging is requested, the Sensor Transducer Block sensor snparameters will be set at the factory the sensor sn parameters can be updated in the field2-11
Reference Manual00809-0100-4697, Rev CAJanuary 2005Rosemount 848TINSTALLATIONUsing Cable GlandsUse the following steps to install the 848T with Cable Glands:1.Remove the junction box cover by unscrewing the four cover screws.2.Run the sensor and power/signal wires through the appropriate cableglands using the pre-installed cable glands (see Figure 2-10).3.Install the sensor wires into the correct screw terminals (follow thelabel on the electronics module).4.Install the power/signal wires onto the correct screw terminals. Poweris polarity insensitive, allowing the user to connect positive ( ) ornegative (–) to eith
Rosemount 848T January 2005 1-2 OVERVIEW Transmitter The Rosemount 848T is optimal for process temperature monitoring because of its ability to simultaneously measure eight separate and independent temperature points with one transmitter. Multiple temperature sensor types may be connected to each 848T
Rosemount 644 Temperature Transmitter Head mount styles available with HART or FOUNDATION fieldbus protocol. Rail mount style available for HART protocol. . Rosemount 148 Temperature Transmitter Head mount style (DIN B) PC-programmable transmitter. Product Data Sheet 00813-0100-4697, Rev GA Rosemount 848T Family Catalog 2008 - 2009
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redundancy are ideal for the Rosemount 3144P temperature transmitter. For installations that have a high number of temperature measurement in close proximity, consider the Rosemount 848T High Density temperature transmitter. Product Data Sheet 00813-0100-4728, Rev RA
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