Emerson 4500 manual Operation and Maintenance, Overview Calibration for Hart Protocol

Page 41

Reference Manual

00809-0100-4027, Rev AA December 2005

Rosemount 4500

Section 4 Operation and Maintenance

Calibration for HART Protocol . . . . . . . . . . . . . . . . . . . . . . page 4-1

OVERVIEW

CALIBRATION FOR HART PROTOCOL

This section contains information on commissioning and operating 4500 Pressure Transmitters. Tasks that should be performed on the bench prior to installation are explained in this section.

HART Communicator and AMS instructions are given to perform configuration functions. For convenience, HART Communicator fast key sequences are labeled “Fast Keys” for each software function below the appropriate headings.

Calibrating a 4500 transmitter may include the following procedures:

•Rerange: Sets the 4 and 20 mA points at required pressures.

•Sensor Trim: Adjusts the position of the factory characterization curve to optimize performance over a specified pressure range, or to adjust for mounting effects.

•Analog Output Trim: Adjusts the analog output to match the plant standard or the control loop.

The 4500 Transmitter uses a microprocessor that contains information about the sensor’s specific characteristics in response to pressure and temperature inputs. A smart transmitter compensates for these sensor variations. The process of generating the sensor performance profile is called factory characterization. Factory characterization also provides the ability to readjust the 4 and 20 mA points without applying pressure to the transmitter.

Trim and rerange functions are also distinct and different. Reranging sets the analog output to the selected upper and lower range points and can be done with or without an applied pressure. Reranging does not change the factory characterization curve stored in the microprocessor. Sensor trimming requires an accurate pressure input and improves compensation by adjusting the position of the factory characterization curve to optimize performance over a specific pressure range.

NOTE

Sensor trimming adjusts the position of the factory characterization curve. It is possible to degrade performance of the transmitter if the trim is done improperly or with inaccurate equipment.

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Contents Reference Manual Page Rosemount 4500 Hygienic Pressure Transmitter Page Table of Contents Section Operation MaintenanceSection Introduction Using this ManualService Support Overview Safety Messages Section InstallationEnvironmental ConsiderationsGeneral Hart Installation Flowchart Mount the Transmitter Installation ProceduresLCD Switches LOI Switches Set SwitchesAMS Configure Alarm DirectionHart Terminal Blocks Connect Wiring and Power UpGrounding Installing the LCD MeterSection Configuration Commissioning on the Bench with Hart Setting the Loop to ManualWiring Diagrams Menu Tree Hart CommunicatorFunction Hart Fast Key Sequence Fast Key SequenceReview Configuration Data Process Variables Sensor TemperatureCheck Output Rerange Basic SetupSet Process Variable Units Fast Keys 3, 1 LCD Display DampingFailure Mode Alarm and Saturation Detailed SetupAlarm and Saturation Level Configuration Alarm and Saturation Values for Multidrop Mode Alarm and Saturation Levels for Burst ModeAlarm Level Verification Process Alerts Scaled Variable Configuration Rosemount Re-mapping Transmitter Test Sensor Temperature UnitDiagnostics Service Loop Test Advanced Functions for Hart Protocol Saving, Recalling, Cloning Configuration DataRosemount Burst Mode Multidrop Communication Polling a Multidropped Transmitter Changing a Transmitter AddressCommunicating with a Multidropped Transmitter Overview Calibration for Hart Protocol Operation and MaintenanceCalibration Overview Transmitter Data Flow with Calibration Options Determining Calibration Frequency Calculate total probable error TPEChoosing a Trim Procedure Sensor Trim Full Trim Zero TrimRecall Factory Trim Recall Factory Trim- Sensor Trim Analog Output Trim Digital-to-Analog Trim Recall Factory Trim- Analog OutputDigital-to-Analog Trim Using Other Scale Fail Module Diagnostic MessagesNonpv Limit Stuck KEY Troubleshooting Symptom Corrective Actions Appendix a Reference Data SpecificationsPerformance Specifications 00809-0100-4027, Rev AA December Range and Sensor Limits Functional SpecificationsRosemount Physical Specifications 11/2 inch Tri-Clamp Module Dimensional DrawingsInch Tri-Clamp Module Fractional Line Fitting Module Code Process Connection Style Ordering InformationAppendix B Product Certificates North American Certifications Hazardous Locations CertificationsRosemount Rosemount Index Index-2 Page ¢00809-0100-4027 ¤
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