Emerson 1154, 00809-0100-4514 manual Sensing Module Checkout

Page 37

Reference Manual

00809-0100-4514, Rev BA January 2008

Rosemount 1154

SENSING MODULE CHECKOUT

NOTE

Numbers in parentheses refer to item numbers in Figure 5-2 on page 5-5.

The sensing module (12) is not field-repairable and must be replaced if defective. If no defect such as a punctured isolating diaphragm or loss of fill fluid is observed, check the sensing module in the following manner:

1.Disengage the header assembly board (4) as described in step four of the electrical housing disassembly procedure on page 5-6.You need not remove the sensing module from the electrical housing for checkout.

2.Jump connections 1 and 2 on the header assembly board (see Figure 5-1 on page 5-2).

3.Using a low-voltage ohmmeter, check the resistance between the jumper wire and the sensing module housing. This resistance should be greater than 10 MΩ. Remove the jumper wire.

4.Jump connections 3 and 4 on the header assembly board and repeat step 3 (see Figure 5-1 on page 5-2).

NOTE

The above procedure does not completely test the sensing module. If circuit board replacement does not correct the abnormal condition and no other problems are obvious, replace the sensing module.

5-3

Image 37

Contents Reference Manual RosemountImportant 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 Overview About the Transmitter Section IntroductionRosemount Overview General Considerations Section InstallationProcess Connections Mechanical ConsiderationsRosemount Electrical Considerations ConduitTransmitter Wiring Connections Procedures InstallationMechanical Range Code Pressure DimensionElectrical Liquid ServiceTransmitter Terminal Block Rosemount Section Calibration Span Adjustment Zero AdjustmentOverview 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 Symptom Potential Source Corrective Action Post Assembly TestsOn Next Check for adequate voltage to the transmitter Nuclear Specifications Specifications and Reference DataPerformance Specifications Range Code Overpressure Effect Range Code Static Pressure Zero Effect Functional SpecificationsRange 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 ¤