Emerson 00809-0100-4514, 1154 manual Rosemount

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Rosemount 1154

Reference Manual

00809-0100-4514, Rev BA January 2008

Correction For High Line Pressure (Rosemount 1154DP and 1154HP Only)

The damping adjustment permits damping of rapid pressure variations by adjusting the single-turn trim potentiometer located on the upper right-hand side of the amplifier board (see Figure 3-4). The available settings, when adjusted to the maximum position, provide time-constant values of at least 1.2 seconds for Range Code 4 and 0.8 seconds for Range Codes 5–9 and 0. Transmitters with the electronic damping option are calibrated and shipped with the adjustment set at the counterclockwise stop, giving the minimum time-constant.

To adjust the damping, turn the damping adjustment potentiometer until the desired time-constant is obtained. It is best to set the damping to the shortest possible time-constant. Since transmitter calibration is not affected by the damping setting, you may adjust the damping with the transmitter installed on the process.

The damping adjustment potentiometer has positive stops at both ends. Forcing the potentiometer beyond the stops may cause permanent damage.

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 of this manual. Spare cover O-rings are supplied with each transmitter.

Span

If a differential transmitter is calibrated with the low side at ambient pressure but will be used at high line pressure, correct the span adjustment to compensate for the effect of static pressure on the unit. If zero is elevated or suppressed, also correct the zero adjustment. Correction factors, expressed in percent of differential pressure input at end points per 1,000 psi static pressure, are:

Range Codes 4, 5, and 8:

+0.75% of input/1,000 psi

Range Codes 6 and 7:

+1.25% of input/1,000 psi

The correction procedure below uses the following example:

Range Code 5, calibrated at –100 to 300 inH2O, to be operated at 1,200 psi line pressure. Note that steps 3–6 are omitted for ranges based at zero differential pressure.

3-6

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Contents Rosemount Reference ManualImportant Notice -- Errata Rosemount 1154 Alphaline Nuclear Pressure Transmitter Return of Material Changes From June 1999 to January Revision StatusNew Old Changes Rosemount Table of Contents Specifications Reference Data Maintenance TroubleshootingSection TOC-3 TOC-4 Section Introduction Overview About the TransmitterRosemount Section Installation Overview General ConsiderationsMechanical Considerations Process ConnectionsRosemount Conduit Electrical ConsiderationsTransmitter Wiring Connections Procedures InstallationMechanical Pressure Dimension Range CodeLiquid Service ElectricalTransmitter Terminal Block Rosemount Section Calibration Span Adjustment Zero AdjustmentOverview Calibration Calibration Procedures Zero and Span AdjustmentZero and Span Adjustment Screws Linearity Adjustment Damping Adjustment Linearity and Damping AdjustmentRosemount Calculate zero adjustment correction in terms of pressure Rosemount Section Operation Overview Transmitter OperationΔ-Cell Linearity Adjustment DemodulatorFV Iref Maintenance Troubleshooting OverviewSafety Messages Test Terminals Board CheckoutSensing Module Checkout Disassembly Procedure Process Flange RemovalRosemount 1154 Parts List Part DescriptionReassembly Procedure Rosemount Process Flange Reassembly Symptom Potential Source Corrective Action Post Assembly TestsOn Next Check for adequate voltage to the transmitter Specifications and Reference Data Nuclear SpecificationsPerformance Specifications Range Code Overpressure Effect Range Code Static Pressure Zero Effect Functional SpecificationsRange Code Response Time Range Code Pressure Ranges 25 to 0-150 inH2O 0-6.22 to 0-37.3 kPaPhysical Specifications Range Code Overpressure LimitRosemount Ordering Information Rosemount 1154DP, 1154HP, and 1154GP Spare Parts Rosemount 1154DP 1154HP 1154GP Part Description Order NoFor use with existing N0026 transmitter only Spare Parts Shelf Life Important Notice Rosemount Current Control Current Limit Index-2 Page ¢00809-XXXX-XXXX ¤
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