Emerson 3051N manual GAS or Liquid Service GAS Service Steam Service

Page 45

Reference Manual

00809-0100-4808, Rev CA June 2008

Rosemount 3051N

FIGURE 3-6. Typical Installation Examples to Illustrate Transmitter and Impulse Piping Locations.

GAS OR LIQUID SERVICE

GAS SERVICE

STEAM SERVICE

Flow

Flow

Flow

Impulse Piping

The piping between the process and the transmitter must accurately transfer the pressure to obtain accurate measurements. There are several possible sources of error: pressure transfer, leaks, friction loss (particularly if purging is used), trapped gas in a liquid line, liquid in a gas line, and density variations between the legs.The best location for the transmitter in relation to the process pipe depends on the process itself. Use the following guidelines to determine transmitter location and placement of impulse piping:

•Keep impulse piping as short as possible.

•For liquid service, slope the impulse piping at least 1 inch per foot (8 cm per m) upward from the transmitter toward the

process connection.

•For gas service, slope the impulse piping at least 1 inch per foot (8 cm per m) downward from the transmitter toward the

process connection.

•Avoid high points in liquid lines and low points in gas lines.

•Make sure both impulse legs are the same temperature.

•Use impulse piping large enough to avoid friction effects and blockage.

•Vent all gas from liquid piping legs.

•When using a sealing fluid, fill both piping legs to the same level.

•When purging, make the purge connection close to the process taps and purge through equal lengths of the same size pipe. Avoid purging through the transmitter.

•Keep corrosive or hot (above 250 °F [121 °C]) process material out of direct contact with the sensor module and flanges.

•Prevent sediment deposits in the impulse piping.

•Keep the liquid head balanced on both legs of the impulse piping.

•Avoid conditions that might allow process fluid to freeze within the process flange.

3-11

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Contents Reference Manual Important Notice -- Errata Rosemount 3051N Return of Material Changes from June 2006 to June OldChanges Rosemount 3051N Table of Contents Installation TroubleshootingSpecifications Reference Data Options Appendix aHart Communicator Glossary Index Section Introduction Using this ManualRosemount 3051N Transmitter Functions Overview Safety MessagesAlarm Level Verification TransmitterSecurity Physical Removal Local Zero and Span Local Keys Configuring Transmitter Alarm and Security Jumper ProcedureElectronics Board Setting the Loop to Manual Wiring Diagrams Bench Hook-up Wiring Diagrams Field Hook-up Review Configuration Data Check OutputProcess Variables Basic Setup Sensor TemperatureSet Process Variable Units Set OutputRerange with a Communicator Only RerangeRerange with a Pressure Input Source and a Communicator Span and Zero Adjustment Buttons Diagnostics Service Detailed SetupTransmitter Test Loop TestCalibration Transmitter Bench Calibration Tasks Field Calibration Tasks Calibration Overview Configure the Analog Output ParametersURV Sensor TrimTypical Zero vs Non-zero-Based Application Illustrations Zero TrimDigital Trim Connection Drawing 4-20 mA Transmitters Full TrimRecall Factory Trim Recall Factory Trim- Sensor Trim Digital-to-Analog Trim Using Other ScaleRecall Factory Trim- Analog Output Analog Output TrimZero Effect HTc = URV + S URV Ps Rosemount 3051N Section Installation Rosemount 3051N Typical Installation Flowchart General Considerations Special Draft Range ConsiderationsMechanical Considerations 156 181 16 x 11/4 Bolts for Mounting to 54.1 Transmitter 120 127 66.8 Traditional Flange Option Code H2 Dimensional Drawing Mounting Rosemount 3051N GAS or Liquid Service GAS Service Steam Service Process Connections Housing Rotation Power SupplyElectrical Considerations Power Supply Load Limitations WiringAccess Requirements Cover Installation Grounding the Transmitter CaseEnvironmental Considerations Troubleshooting Returning Rosemount Products and Materials Symptom Corrective ActionsSeismic Nuclear SpecificationsModel Range Code Hydrostatic Test Pressure Ambient Temperature Effect12 Performance SpecificationsReference Accuracy DriftOverpressure Effect Static Pressure Effect Power Supply Effect Load Effect Mounting Position EffectRange Code Overpressure Effect Range Code Static Pressure Zero Effect1Service Functional SpecificationsTemperature Limits OutputSpan and Zero, Zero Elevation, Suppression Range Minimum Span Upper URL Lower LRLRange Code Minimum Time Constant Tc Including Dead Time Td Pressure12 Maximum WorkingStatic Pressure Limits Overpressure Limits Burst PressurePhysical Specifications Materials of Construction Option Code Description Add Ordering Information Housing Material Conduit Entry Size Configuration InformationMounting Bracket Options Meters optionalDate On Rosemount 3051N Exploded View with Coplanar Process Flange Rosemount 3051N Rosemount 3051N Section Options Overview Safety Messages LCD MeterCustom Meter Configuration Exploded View of the Rosemount 3051N with Optional LCD Meter Installing the MeterRosemount 3051N Error Diagnostic MessagesPress Limit Mounting Brackets OperationTransient Protection Terminal Block T1 Traditional Flange H2Transient Protection Terminal Block T1 Rosemount 3051N Appendix a Hart Communicator Introduction Safety MessagesRosemount 3051N Online Menu Function Hart Fast Key Sequence Connections and Hardware Figure A-3. Rosemount Hart terminal access doorFigure A-4. Bench Hook-up MA Transmitters Rosemount Communicator KeysAction Keys Function Keys Alphanumeric and Shift KeysData Entry Fast Key Sequence Conventions Fast Key Sequence Example Fast Key SequencesMenus Functions Main MenuOnline Menu Touch Multifunction LED Alphanumeric KeysTouch Screen Multifunction LED Processing IndicationRosemount 3051N Diagnostic Messages Fast Key Sequences Hot Key optionsMessage Description Rosemount 3051N Uploadvariable Rosemount 3051N Rosemount 3051N Glossary Smart Family Index 00809-0100-4808, Rev CA June Security Page ¢00809-0100-4801V¤