Emerson 3051N manual Span and Zero Adjustment Buttons

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Reference Manual

00809-0100-4808, Rev CA June 2008

Rosemount 3051N

FIGURE 2-6. Local Zero and Span Adjustments.

To rerange the transmitter using the span and zero buttons, perform the following procedure:

1.Loosen the screw holding the label on top of the transmitter housing, and rotate the label to expose the zero and span buttons (see Figure 2-6).

2.Using a pressure source with an accuracy three to ten times the desired calibrated accuracy, apply a pressure equivalent to the lower range value to the high side of the transmitter.

3.To set the 4 mA point, press and hold the zero button for at least two seconds, then verify that the output is 4 mA. If a meter is installed, it will display ZERO PASS.

4.Apply a pressure equivalent to the upper range value to the high side of the transmitter.

5.To set the 20 mA point, press and hold the span button for at least two seconds, then verify that the output is 20 mA. If a meter is installed, it will display SPAN PASS.

NOTE

If the transmitter security jumper is in the ON position, or if the local zero and span adjustments are disabled through the software, you will not be able to make adjustments to the zero and span using the local buttons. Refer to Figure 2-1for the proper placement of the transmitter security jumper. Or refer to “Local Span and Zero Control (Local Keys)” in Section 2 for instructions on how to enable the span and zero buttons.

Span and Zero Adjustment Buttons

After you rerange the transmitter using the span and zero adjustments, it is possible to disable the adjustments to prevent further reranging. Refer to “Local Span and Zero Control (Local Keys)” below for

more information.

2-11

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Contents Reference Manual Important Notice -- Errata Rosemount 3051N Return of Material Changes Changes from June 2006 to JuneOld Rosemount 3051N Table of Contents Specifications Reference Data InstallationTroubleshooting Hart Communicator OptionsAppendix a Glossary Index Section Introduction Using this ManualRosemount 3051N Transmitter Functions Overview Safety MessagesSecurity Alarm Level VerificationTransmitter 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 Process Variables Review Configuration DataCheck Output Set Output Sensor TemperatureBasic Setup Set Process Variable UnitsRerange with a Communicator Only RerangeRerange with a Pressure Input Source and a Communicator Span and Zero Adjustment Buttons Diagnostics Service Detailed SetupCalibration Transmitter TestLoop Test 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 TrimAnalog Output Trim Digital-to-Analog Trim Using Other ScaleRecall Factory Trim Recall Factory Trim- Sensor Trim Recall Factory Trim- Analog OutputZero Effect HTc = URV + S URV Ps Rosemount 3051N Section Installation Rosemount 3051N Typical Installation Flowchart Mechanical Considerations General ConsiderationsSpecial Draft Range 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 Electrical Considerations Process Connections Housing RotationPower Supply Power Supply Load Limitations WiringEnvironmental Considerations Access Requirements Cover InstallationGrounding the Transmitter Case Troubleshooting Returning Rosemount Products and Materials Symptom Corrective ActionsSeismic Nuclear SpecificationsModel Range Code Hydrostatic Test Pressure Drift Performance SpecificationsAmbient Temperature Effect12 Reference AccuracyRange Code Static Pressure Zero Effect1 Power Supply Effect Load Effect Mounting Position EffectOverpressure Effect Static Pressure Effect Range Code Overpressure EffectOutput Functional SpecificationsService Temperature LimitsRange Code Minimum Time Constant Tc Including Dead Time Td Span and Zero, Zero Elevation, SuppressionRange Minimum Span Upper URL Lower LRL Overpressure Limits Burst Pressure Maximum WorkingPressure12 Static Pressure LimitsPhysical Specifications Materials of Construction Option Code Description Add Ordering Information Meters optional Configuration InformationHousing Material Conduit Entry Size Mounting Bracket OptionsDate 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 Action Keys RosemountCommunicator Keys Data Entry Function KeysAlphanumeric and Shift Keys Main Menu Fast Key SequencesFast Key Sequence Conventions Fast Key Sequence Example Menus FunctionsOnline Menu Touch Multifunction LED Processing Indication Alphanumeric KeysMultifunction LED Touch ScreenRosemount 3051N Message Description Diagnostic MessagesFast Key Sequences Hot Key options Rosemount 3051N Uploadvariable Rosemount 3051N Rosemount 3051N Glossary Smart Family Index 00809-0100-4808, Rev CA June Security Page ¢00809-0100-4801V¤