Rev. DA Models 2088, 2090P, And 2090F Pressure

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00809-0100-4690EnglishRev. DAModels 2088, 2090P,and 2090F PressureTransmitters

Product Manual1Models 2088, 2090P, and2090F Pressure TransmittersNOTICERead this manual before working with the product. For personal and systemsafety, and for optimum product performance, make sure you thoroughlyunderstand the contents before installing, using, or maintaining this product.Within the United States, Rosemount Inc. has two toll-free assistance numbers.Customer Central: 1-800-999-9307 (7:00 a.m. to 7:00 p.m. CST)Technical support, quoting, and order-related questions.North American1-800-654-7768 (24 hours a day – Includes Canada)Response Center: Equipment service needs.For equipment service or support needs outside the United States, contact yourlocal Rosemount representative.The products described in this document are NOT designed for nuclearqualified applications.Using non-nuclear qualified products in applications that require nuclearqualified hardware or products may cause inaccurate readings.For information on Rosemount nuclear-qualified products, contact your localRosemount Sales Representative.Rosemount Model 2088 Smart Pressure Transmitters may be protected by one or more U.S. and foreignpatents issued and pending.Rosemount Models 2088, 2090P, and 2090F Pressure Transmitters may be protected by one or more of thefollowing U.S. Patent Nos.: 4,970,898 and 5,083,091. May depend on model. Other foreign patents issuedand pending.Rosemount, the Rosemount logotype, and SMART FAMILY are registered trademarks of Rosemount Inc.Coplanar is a trademark of Rosemount Inc.HART is a registered trademark of the HART Communication Foundation.Teflon is a registered trademark of E.I. du Pont de Nemours & Co.Neobee is a registered trademark of Stepan Chemical Company.Hastelloy is a registered trademark of Haynes International.Tri-Clamp is a registered trademark of Tri-Clover Inc. of the Alfa-Laval Group.PMC is a registered trademark of Paper Machine Company.Viton is a registered trademark of E.I. Du Pont de Numours & Co.Cover Photo: 2088-006ABFisher-Rosemount satisfies all obligations coming from legislationto harmonize product requirements in the European Union.Rosemount Inc.PRED8200 Market BoulevardChanhassen, MN 55317 USATel 1-800-999-9307Fax (612) 949-7001 2000 Rosemount Inc.INTINU. S. A.www.rosemount.com

Table of ContentsIMPORTANTProcedures and instructions in this manual may require special precautions toensure the safety of the personnel performing the operations. Information thatraises potential safety issues is indicated by a warning symbol ( ). Refer to thesafety messages, listed at the beginning of each section, before performingan operation preceded by this symbol.IMPORTANT . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . iSECTION 1IntroductionUsing this Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1SECTION 2Commissioning theTransmitterOverview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1Commission: On the Bench or In the Loop . . . . . . . . . . . . . . . . . 2-2Commissioning the Smart Transmitter . . . . . . . . . . . . . . . . . . . . 2-2Set up the Smart Transmitter and the Communicator . . . . 2-2Review Configuration Data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-2Review . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3Check Output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3Process Variables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3Basic Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3Tag . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3Output Units . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3Rerange . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3Damping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-4Detailed Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5Meter Setup . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5Burst Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5Save, Recall, or Clone Configuration Data . . . . . . . . . . . . . . 2-6Enable or Disable Local Span and Zero Buttons . . . . . . . . 2-6Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6Calibration Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-6Sensor Trim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-7Output Trim . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-8Diagnostics and Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10Multidrop Communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-10SECTION 3InstallationOverview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1General Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3Environmental Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3Temperature . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3Moisture and Corrosives . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3Hazardous Locations Installations . . . . . . . . . . . . . . . . . . . . 3-3i

Rosemount Model 2088/2090 Pressure TransmittersMechanical Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4Mounting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-4Impulse Piping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-5Access Requirements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6Model 2090P . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-7Model 2090F . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-10Electrical Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11Power Supply . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11Field Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-11Failure Mode and Security Jumpers . . . . . . . . . . . . . . . . . . . . . 3-12Failure Mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-12Jumper Locations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13Transmitter Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-13Zero and Span Adjustments . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14Rerange Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-14SECTION 4Maintenance andTroubleshootingSafety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3Downscale Alarm . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4Disassembly Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5Reassembly Procedure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5Returning Rosemount Products and/or Materials . . . . . . . . . . . 4-6SECTION 5Specifications andReference DataOverview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1Functional Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-1Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-3Physical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-5Spare Parts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-7Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-10Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12Tagging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5-12APPENDIX ALCD MeterLCD Meter . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-1Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-1Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-1Custom Meter Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-2Diagnostic Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .A-3APPENDIX BModel 275 HARTCommunicatorOverview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-1Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-1Warnings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-1Connections and Hardware . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-4Communicator Keys . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-5Fast Key Sequences . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-7Menus and Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-7Main Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-7Online Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-8Diagnostic Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .B-9ii

Table of ContentsAPPENDIX CModel 2088Low Power OptionOverview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-1Safety Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-1Commissioning the Transmitter . . . . . . . . . . . . . . . . . . . . . . . . .C-1Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-1Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-2Calibration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-3Selector Switch . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-3Potentiometer Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . .C-4Setting the Zero . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-4Setting the Span . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-5Transient Protection Option . . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-6Installation Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-6Transient Protection Board Installation . . . . . . . . . . . . . . . .C-6Transient Protection Board Wiring . . . . . . . . . . . . . . . . . . . .C-6Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . C-7Functional Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . .C-7Performance Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . C-7APPENDIX DApproval DrawingsOverview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .D-1APPENDIX EEuropean ATEX DirectiveInformationiii

Rosemount Model 2088/2090 Pressure Transmittersiv

Section1USING THIS MANUALIntroductionThis manual provides information on commissioning, installing, andoperating the Rosemount Models 2088, 2090P, and 2090F PressureTransmitters. The manual is organized into the following sections:Section 2: Commission the Transmitterprovides information on commissioning and operating the transmitters,software functions, configuration parameters, and on-line variables.Section 3: Installationprovides mechanical and electrical installation instructions.Section 4: Maintenance and Troubleshootingprovides basic troubleshooting instructions, including sensing modulecheckout, disassembly, and reassembly procedures.Section 5: Specifications and Reference Dataprovides functional specifications, physical specifications, performancespecifications, for the Model 2088, 2090P, and 2090F PressureTransmitters.Appendix A: LCD Meterprovides operating instructions for the optional LCD meter.Appendix B: Model 275 HART Communicatorcontains a communicator overview, a HART Communicator menu treefor the Model 2088 Smart, and a table of HART Communicator fast keysequences. A table of diagnostic messages associated with thiscommunicator is also included.Appendix C: Low Power Optionprovides installation and calibration information specific to the LowPower Option.Appendix D: Transient Protection Optionprovides installation, wiring, and specification information for thetransient protection optionAppendix E: Approval Drawingsprovides the drawings necessary to install the transmitter inhazardous location.Appendix F: European ATEX Directive Informationprovides information on European ATEX compliance.SAFETY MESSAGESProcedures and instructions in this manual may require specialprecautions to ensure the safety of the personnel performing theoperations. Information that raises potential safety issues is indicatedby a warning symbol ( ). Refer to the safety messages, listed at thebeginning of each section, before performing an operation preceded bythis symbol.1-1

Rosemount Model 2088/2090 Pressure Transmitters1-2

Section2Commissioning the TransmitterOVERVIEWThis section contains information on commissioning the transmitter.Commissioning involves reviewing configuration data, setting the 4 and20 mA points, configuring the transmitter to recognize accessories suchas an LCD meter, and testing the transmitter output.SAFETY MESSAGESThis section contains procedures that require connecting a communicatorto the transmitter, or making connections in an explosive atmosphere.The following safety messages apply to all procedures throughout thissection requiring cover removal and communicator or ammeterconnection to the transmitter terminal block. Keep the following safetymessages in mind whenever you perform an operation requiring coverremoval or the connection of a communicator or other device to ameasurement loop.WarningsExplosions could result in death or serious injury: Do not remove the transmitter covers in explosive atmosphereswhen the circuit is alive. Before connecting a HART-based communicator in an explosive atmosphere,make sure the instruments in the loop are installed in accordance withintrinsically safe or non-incendive field wiring practices. Both transmitter covers must be fully engaged to meetexplosion-proof requirements.High voltage that may be present on leads could cause electrical shock: Avoid contact with leads and terminals.2-1

Rosemount Model 2088/2090 Pressure TransmittersCOMMISSION: ON THEBENCH OR IN THE LOOPCommission the Model 2088 Transmitter before or after installation. Itmay be useful to commission the transmitter on the bench beforeinstallation to ensure proper operation, to familiarize yourself withtransmitter functionality, and to avoid exposing the transmitterelectronics to the plant environment.Commissioning consists of : Reviewing configuration dataSetting output unitsSetting the 4 and 20 mA pointsConfiguring the transmitter for any non-standard accessories orfunctions, and testing the transmitter outputCOMMISSIONING THESMART TRANSMITTERSet up the SmartTransmitter and theCommunicatorTo configure the smart transmitter on the bench, connect thetransmitter and the communicator as shown in Figure 2-1. To powerthe transmitter you will need a power supply capable of providing 10.5to 36.0 V dc and a meter to measure output current. To enablecommunication, a resistance of at least 250 ohms must be presentbetween the communicator loop connection and the power supply. Youcan connect the communicator leads at any termination point in thesignal loop, but it is most convenient to connect them to the terminalslabeled “COMM” on the terminal block.After you connect the bench equipment as shown in Figure 2-1, turn onthe communicator by pressing the ON/OFF key. The communicator willsearch for a HART-compatible device and will indicate when theconnection is made. If the connection is not made, the communicatorwill indicate that no device was found.FIGURE 2-1. Connectinga HART Communicator toa Transmitter Loop.RL 250 VThe signal loop may be groundedat any single point in the loop, ormay be left ungroundedREVIEWCONFIGURATION DATA2-2Review all of the factory-set configuration data to ensure that it reflectsthe needs of your application before operating the transmitter in anactual installation.See “Safety Messages” on page 2-1 for complete warning information.2088S-2088C02CPowerSupply

Commissioning the TransmitterReviewHART Fast Keys1, 5Review the transmitter configuration parameters set at the factory toensure accuracy and compatibility with your particular application.After activating the review function, scroll through the data list tocheck each variable. Refer to “Basic Setup” in this section of themanual if a change to the transmitter configuration data is necessary.CHECK OUTPUTBefore performing other transmitter on-line operations, review thedigital output parameters to ensure that the transmitter is operatingproperly and is configured to the appropriate process variables.Process VariablesThe process variables for the Model 2088 provide the transmitteroutput, and are continuously updated. The Process Variables menudisplays the following process variables:HART Fast Keys1, 1 Pressure Percent Range Analog OutputBASIC SETUPFrom the Basic Setup menu you can configure the transmitter for certainbasic variables. In many cases, all of these variables are pre-configured atthe factory. Configuration may be required if your transmitter is notconfigured or if the configuration variables need revision.TagThe Tag variable is the easiest way to identify and distinguish betweentransmitters in multi-transmitter environments. Use this variable tolabel transmitters electronically according to the requirements of yourapplication. The tag you define is automatically displayed when aHART-based communicator establishes contact with the transmitter atpower-up. The tag may be up to eight characters long and has no impacton the primary variable readings of the transmitter.HART Fast Keys1, 3, 1The Unit command sets the desired primary variable units. Set thetransmitter output to one of the following engineering units:Output UnitsHART Fast Keys1, 3, 2 inH20inHgftH20mmH20psibarmbarinH2O @ 4 C g/cm2kg/cm2PakPatorratmmmH20 @ 4 CNOTEAfter changing units, press SEND (F2) so the microprocessor willrecalculate the associated variables (4–20 mA points, for example). TheModel 2088 Smart recalculates all variables that depend on units. Afterthe transmitter recalculates the variables, you may change any of theremaining parameters.RerangeHART Fast Keys1, 3, 3The Range Values command sets the 4 and 20 mA points (lower andupper range values). Setting the range values to the limits of expectedreadings maximizes transmitter performance; the transmitter is mostaccurate when operated within the expected pressure ranges for yourapplication. In practice, you may reset the transmitter range values asoften as necessary to reflect changing process conditions.See “Safety Messages” on page 2-1 for complete warning information.2-3

Rosemount Model 2088/2090 Pressure TransmittersNOTERegardless of the range points, the Model 2088 Smart will measure andreport all readings within the digital limits of the sensor. For example,if the 4 and 20 mA points are set to 0 and 10 inH20, and the transmitterdetects a pressure of 25 inH20, it digitally outputs the 25 in H20reading and a 250% percent of span reading. However, there may be upto 5.0% error associated with output outside of the range points.You may use one of three methods to rerange the transmitter. Eachmethod is unique; examine all three closely before deciding whichmethod to use.Method 1:Rerange Using theCommunicatorReranging using only the communicator is the easiest and mostpopular way to rerange the transmitter. This method changes thevalues of the analog 4 and 20 mA points independently without apressure input.To rerange using only the communicator enter the fast-key sequenceabove, select 1 Keypad input, and follow the on-line instructions. Orenter the values directly from the HOME screen.Method 2:Rerange Using theCommunicator and a PressureSource or Process PressureReranging using the communicator and a pressure source or processpressure is a way of reranging the transmitter when specific 4 and 20mA points are not known. This method changes the values of theanalog 4 and 20 mA points. When you set the 4 mA point the span ismaintained; when you set the 20 mA point the span changes.To rerange using the communicator and a pressure source or processpressure enter the fast-key sequence above, select 2 Apply values, andfollow the on-line instructions.Method 3:Rerange Using theLocal Zero and Span Buttonsand a Pressure Source orProcess PressureDampingHART Fast Keys2-41. 3. 5Reranging using the local zero and span adjustments and a pressuresource is a way of reranging the transmitter when specific 4 and 20 mApoints are not known and a communicator is not available. When youset the 4 mA point the span is maintained; when you set the 20 mApoint the span changes.The Damping command changes the response time of the transmitter tosmooth variations in output readings caused by rapid changes in input.Determine the appropriate damping setting based on the necessaryresponse time, signal stability, and other requirements of the loopdynamics of your system. The default damping value is 0.50 secondsand can be reset in fixed increments of 0.05, 0.10, 0.20, 0.40, 0.80, 1.60,3.20, 6.40, 12.8, or 25.6 seconds.

Commissioning the TransmitterDETAILED SETUPMeter SetupHART Fast Keys1, 3, 6The Meter Type command allows you to configure the transmitter for usewith an LCD meter. Transmitters shipped without meters are set to“NONE.” Change the meter settings as often as necessary to reflectchanging process or application conditions. To change the meter settings,and thereby configure the transmitter to recognize the LCD meter, performthe following procedure.1. Select 1 Device setup, 3 Basic setup, 6 Meter type to prepare tochange the meter settings.2. Select the appropriate variable configuration from the “Metertype” screen, and press enter.NOTESelecting “None” from the meter type screen will disable the meter.3. Select SEND to download the new meter configurationinformation to the transmitter.For a more detailed description of the LCD meter features anddiagnostic messages, refer to “LCD Meter” on page A-1.Burst ModeHART Fast Keys1, 4, 3, 3, 3Burst Mode sets the transmitter to maintain digital contact with aDigital Control System that has custom software to support burstmode. When the Model 2088 Smart is configured for burst mode, itprovides faster digital communication from the transmitter to thecontrol system by eliminating the time required for the control systemto request information from the transmitter.Burst mode is compatible with use of the analog signal. Because HART protocol features simultaneous digital and analog data transmission,the analog value can drive other equipment in the loop while the controlsystem is receiving the digital information. Burst mode applies only tothe transmission of dynamic data (pressure and temperature inengineering units, pressure in percent of range, and/or analog output inmA), and does not affect the way other transmitter data is accessed.Access to information other than dynamic transmitter data is obtainedthrough the normal poll/response method of HART communication. AHART-based communicator or the control system may request any ofthe information that is normally available while the transmitter is inburst mode. Between each message sent by the transmitter, a shortpause allows the HART-based communicator or a control system toinitiate a request. The transmitter will receive the request, process theresponse message, and then continue “bursting” the dataapproximately three times per second.2-5

Rosemount Model 2088/2090 Pressure TransmittersSave, Recall, or CloneConfiguration DataHART Fast Keysleft arrow, 3 (note)Enable or Disable LocalSpan and Zero ButtonsHART Fast Keys1, 4, 4, 1, 7CALIBRATIONData that was entered off-line can be stored in the communicatormemory and downloaded to other transmitters later. Data also can becopied from a transmitter in order to be sent to other transmitters in aprocess known as “cloning”. This is especially useful if you work with alarge number of transmitters that require the same configuration data.The Local Keys command allows you to enable or disable the local spanand zero buttons. Disabling the local keys will prevent unauthorizedreranging using the span and zero buttons, but will not preventreranging using the communicator. To prevent all changes to theconfiguration data, use the transmitter security jumper (see“Transmitter Security” on page 3-13).Calibrating the transmitter increases the precision of yourmeasurement system. You may use one or more of a number of trimfunctions when calibrating.To understand the trim functions, it is necessary to understand thatsmart transmitters operate differently from analog transmitters. Animportant difference is that smart transmitters are factory-characterized;they are shipped with a standard sensor curve stored in the transmitterfirmware. In operation, the transmitter uses this information toproduce a process variable output, in engineering units, dependent onthe sensor input. The trim functions allow you to make corrections tothe factory-stored characterization curve by digitally altering thetransmitter’s interpretation of the sensor input.The trim functions should not be confused with the rerange functions.Although the rerange command matches a sensor input to a 4–20 mAoutput—as in conventional calibration—it does not affect thetransmitter’s interpretation of the input.Calibration OverviewComplete calibration of the Model 2088 Smart Pressure Transmitterinvolves one or more of the following tasks:Configure the Analog Output Parameters Set Process Variable Units (Page 2-3) Rerange (Page 2-3) Set Output Type (Page 2-3) Set Damping (Page 2-4)Calibrate the Sensor Full Trim (Page 2-8) Zero Trim (Page 2-7)Calibrate the 4–20 mA Output Digital to Analog Trim (Page 2-9) or Scaled Digital to Analog Trim (Page 2-9)Figure 2-2 illustrates the Model 2088 Smart Pressure Transmitter dataflow. This data flow can be summarized in four major steps:1. A change in pressure is measured by a change in the sensoroutput (Sensor Signal).2. The sensor signal is converted to a digital format that can beunderstood by the microprocessor (Analog-to-Digital SignalConversion).3. Corrections are performed in the microprocessor to obtain adigital representation of the process input (Digital PV).4. The Digital PV is converted to an analog value(Digital-to-Analog Signal Conversion).2-6

Commissioning the TransmitterFIGURE 2-2. Transmitter Data Flowwith Calibration Options.Transmitter Ranged 0 to 100 inH2OTransmitter Electronics ModuleInputPressureInput Device20.00 mAAnalog OutputSensorHARTCommunicatorMicroprocessorDigital PVSensorSignalOutput Device1151-1151F05B2088s:PT-4763Online1 Device Setup2PV100.00 inH2O3AO20.00 mA4LRV0.00 inH2O5URV 100.00 inH2ONOTEValue on PV line should equalthe input pressure. Value onAO line should equal theoutput device reading.Deciding Which TrimProcedure to UseTo decide which trim procedure to use, you must first determinewhether the analog-to-digital section or the digital-to-analog section ofthe transmitter electronics is in need of calibration. To do so, refer toFigure 2-2 and perform the following procedure:1. Connect a pressure source, a HART communicator, and a digitalreadout device to the transmitter.2. Establish communication between the transmitterand the communicator.3. Apply pressure (100 in H20, for example).4. Compare the applied pressure to the Process Variable (PV) line onthe Communicator Online Menu. If the PV reading on thecommunicator does not match the applied pressure, and you arecertain your test equipment is accurate, perform a sensor trim.5. Compare the Analog Output (AO) line on the communicator onlinemenu to the digital readout device. If the AO reading on thecommunicator does not match the digital readout device, and you arecertain your test equipment is accurate, perform an output trim.Sensor TrimYou can trim the sensor using either the full trim or the zero trimfunction. The trim functions vary in complexity, and their use isapplication-dependent. Both alter the transmitter’s interpretation ofthe input signal.Zero TrimA Zero Trim is a single-point adjustment. It is useful for compensatingfor mounting position effects, and is most effective when performedwith the transmitter installed in its final mounting position. Since thiscorrection maintains the slope of the characterization curve, it shouldnot be used in place of a full trim over the full sensor range.HART Fast Keys1, 2, 3, 3, 1NOTEUse full t

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