Emerson 1154, 00809-0100-4514 manual Linearity and Damping Adjustment

Page 27

Reference Manual

00809-0100-4514, Rev BA January 2008

Rosemount 1154

Figure 3-4. Linearity and Damping Adjustment.

Damping Adjustment

1.Apply mid-range pressure and note the error between theoretical and actual output signal.

2.Apply full-scale pressure. Multiply the error noted in step 1 by six and by the rangedown factor:

Maximum Allowable Span

Rangedown Factor = --------------------------------------------------------------------

Calibrated Span

3.Add the result to the full-scale output for negative errors, or subtract the result from the full-scale output for positive errors by adjusting the linearity trimmer (see Figure 3-4). Example: At

4-to-1 rangedown the midscale point is low by 0.05 mA. Therefore, adjust the “Linearity” trimmer until full-scale output increases by (0.05 mA 6 4) = 1.2 mA.

4.Readjust zero and span.

NOTE

If you remove either cover during the above procedures, replace the O-ring and torque the cover per the instructions given in Section 5 Maintenance and Troubleshooting. Spare cover O-rings are supplied with each transmitter.

Damping

Adjustment

(Optional)

Linearity

Adjustment

Electronics Side of

Transmitter

Housing (Cover

Removed)

Damping electronics are available as an option. Transmitters with standard electronics can be retrofitted with the adjustable damping feature by changing out both the amplifier board (RMT P/N 01154-0021-0004) and the calibration board (RMT P/N 01154-0023-0002).

3-5

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Contents Reference Manual RosemountImportant Notice -- Errata Rosemount 1154 Alphaline Nuclear Pressure Transmitter Return of Material Revision Status Changes From June 1999 to JanuaryNew Old Changes Rosemount Table of Contents Maintenance Troubleshooting Specifications Reference DataSection TOC-3 TOC-4 Overview About the Transmitter Section IntroductionRosemount Overview General Considerations Section InstallationProcess Connections Mechanical ConsiderationsRosemount Electrical Considerations ConduitTransmitter Wiring Connections Installation ProceduresMechanical Range Code Pressure DimensionElectrical Liquid ServiceTransmitter Terminal Block Rosemount Span Adjustment Zero Adjustment Section CalibrationOverview Calibration Zero and Span Adjustment Calibration ProceduresZero and Span Adjustment Screws Linearity Adjustment Linearity and Damping Adjustment Damping AdjustmentRosemount Calculate zero adjustment correction in terms of pressure Rosemount Overview Transmitter Operation Section OperationΔ-Cell Demodulator Linearity AdjustmentFV Iref Overview Maintenance TroubleshootingTest Terminals Board Checkout Safety MessagesSensing Module Checkout Process Flange Removal Disassembly ProcedurePart Description Rosemount 1154 Parts ListReassembly Procedure Rosemount Process Flange Reassembly Post Assembly Tests Symptom Potential Source Corrective ActionOn Next Check for adequate voltage to the transmitter Nuclear Specifications Specifications and Reference DataPerformance Specifications Range Code Overpressure Effect Functional Specifications Range Code Static Pressure Zero EffectRange Code Response Time 25 to 0-150 inH2O 0-6.22 to 0-37.3 kPa Range Code Pressure RangesRange Code Overpressure Limit Physical SpecificationsRosemount Ordering Information Rosemount 1154DP 1154HP 1154GP Part Description Order No Rosemount 1154DP, 1154HP, and 1154GP Spare PartsFor use with existing N0026 transmitter only Spare Parts Shelf Life Important Notice Rosemount Current Control Current Limit Index-2 Page ¢00809-XXXX-XXXX ¤