
4.4.1 Point Calibration.............................................................................................................. 43
4.4.2 Capacitance Calibration.................................................................................................. 44
4.4.3 D/A Trim .......................................................................................................................... 44
4.4.4 Strapping Table ............................................................................................................... 46
Section 5: Configuration & Calibration with Model 275 Communicator without
a Device Description............................................................................................... 47
5.1 Range/Span Control ....................................................................................................... 47
5.2 Basic Rules & Conventions of HART Configuration Software (Model 275) .................... 48
5.3 Tag ID.............................................................................................................................. 48
5.4 Set Up Procedures ......................................................................................................... 49
5.5 Reading Input and Output............................................................................................... 52
5.6 Calibration Using Actual Tank Level................................................................................ 53
5.7 Bench Calibration (if needed) ......................................................................................... 54
5.7.1 Bench Calibration Information Sheet .............................................................................. 55
5.8 Point Calibration.............................................................................................................. 56
5.8.1 Fine Tuning Calibration ................................................................................................... 56
5.8.2 Selecting Engineering Units............................................................................................ 56
5.9 Handheld Calibrator Error Messages.............................................................................. 57
Section 6: Troubleshooting ...................................................................................................... 59
6.1 Identifying a Problem/Symptom...................................................................................... 60
6.1.2 Error Codes .................................................................................................................... 60
6.2 Troubleshooting Loop Connection .................................................................................. 60
6.3 Rosemount Model 268 or 275 Calibrator Cannot Identify or Find Device....................... 61
6.4 Rosemount Model 275 Calibrator with
Device Description Cannot Identify or Find Device......................................................... 61
6.5 RCT Series Transmitter Does not Communicate with
Drexelbrook PC software ................................................................................................ 62
6.6 Troubleshooting Transmitter ............................................................................................ 63
6.6.1 Transmitter Drift Test ....................................................................................................... 64
6.7 Troubleshooting Sensing Element .................................................................................. 65
6.8 Troubleshooting Coaxial Cable ....................................................................................... 66
6.9 Static Electricity .............................................................................................................. 68
6.10 Radio Frequency Interference......................................................................................... 68
6.11 Factory Assistance.......................................................................................................... 68
6.12 Field Service ................................................................................................................... 69
6.13 Customer Training ........................................................................................................... 69
6.14 Return Equipment........................................................................................................... 69
6.15 RCT Series Troubleshooting Guide................................................................................. 71
Section 7: Specifications.......................................................................................................... 73
7.1 Transmitter Specifications ............................................................................................... 73
7.2 Coaxial Cable Specifications .......................................................................................... 74
7.3 Enclosure Specifications................................................................................................. 74
7.4 Approvals Available......................................................................................................... 75
7.4.1 ATEX Approvals - Install Per 420-0004-203-ID............................................................... 75
7.4.2 CSA Approvals - Install Per 420-0004-225-CD............................................................... 76
7.4.3 FM Approvals - Install Per 420-0004-224-CD ................................................................. 76
Section 8: Normal Maintenance............................................................................................... 77
8.1 Viewport Cleaning........................................................................................................... 77
Appendix A: Approval Drawings ................................................................................................A-1
A.1 ATEX APPROVAL DRAWINGS .....................................................................................A-1
A.2 CSA APPROVAL DRAWINGS .....................................................................................A-12
A.3 FM APPROVAL DRAWINGS .......................................................................................A-29