Siemens UM344-2 사용자 설명서

 

iii

 

 

6.1.3  RTD/OHM Type Input Calibration ..............................................................................6-6 

 

 

 

6.1.3.1  RTD/OHM Calibration Check............................................................................6-6 

 

 

 

6.1.3.2  Current Source Calibration .................................................................................6-7 

 

 

6.1.4  Thermocouple/Millivolt Type Input Calibration ..............................................................6-9 

 

 

 

6.1.4.1  Thermocouple/Millivolt Calibration Check............................................................6-9 

 

 

 

6.1.4.2  Narrow/Wide Millivolt Calibration ..................................................................... 6-11 

 

6.2  PREVENTIVE MAINTENANCE .................................................................................... 6-12 

 

 

6.2.1  Tool and Equipment Requirements............................................................................. 6-12 

 

 

6.2.2  Transmitter Exterior Inspection.................................................................................. 6-13 

 

 

6.2.3  Transmitter Exterior Cleaning.................................................................................... 6-13 

 

 

6.2.4  Transmitter Enclosure Interior Inspection ................................................................... 6-13 

 

 

6.2.5  Transmitter Calibration.............................................................................................. 6-14 

 

6.3  TROUBLESHOOTING.................................................................................................... 6-14 

 

 

6.3.1  Preliminary Troubleshooting ...................................................................................... 6-14 

 

 

6.3.2  Troubleshooting ........................................................................................................ 6-15 

 

 

 

6.3.2.1  Diagnostic Messages ....................................................................................... 6-15 

 

 

 

6.3.2.2  Possible Transmitter Output Problems ............................................................... 6-19 

 

 

6.3.3  Diagnosing a Defective Digital (LCD) Meter ............................................................. 6-22 

 

 

6.3.4  Enclosure Thread Lubrication.................................................................................... 6-23 

 

6.4  NON-FIELD-REPLACEABLE ITEMS ............................................................................ 6-23 

 

6.5  ASSEMBLY REMOVAL AND REPLACEMENT ........................................................... 6-24 

 

 

6.5.1  Electronics Module Removal and Replacement........................................................... 6-24 

 

6.6  MAINTENANCE RECORDS .......................................................................................... 6-25 

 

6.7  RECOMMENDED SPARE AND REPLACEMENT PARTS............................................ 6-25 

 

6.8  SOFTWARE COMPATIBILITY...................................................................................... 6-26 

 

6.9  RETURN SHIPMENT ..................................................................................................... 6-26 

 
7.0 CIRCUIT DESCRIPTION.....................................................................................................7-1 
 

7.1 ELECTRONICS ASSEMBLY .............................................................................................7-1 

 

7.2 THEORY OF OPERATION................................................................................................7-3 

 

 

7.2.1 Thermocouple/Millivolt Input ........................................................................................7-3 

 

 

7.2.2 RTD/OHMS Input.......................................................................................................7-3 

 

 

7.2.3 Signal Conversion ........................................................................................................7-4 

 

 

7.2.4 Communication Format................................................................................................7-4 

 
8.0  MODEL DESIGNATION AND SPECIFICATIONS...........................................................8-1 
 

8.1  MODEL DESIGNATION...................................................................................................8-1 

 

8.2  ACCESSORIES .................................................................................................................8-2 

 

8.3  SPECIFICATIONS ............................................................................................................8-5 

 

 

8.3.1  Mechanical................................................................................................................8-5 

 

 

8.3.2  Functional and Performance........................................................................................8-5 

 

 

8.3.3  Two-Wire Cable .........................................................................................................8-7 

 

 

8.3.4  Sensor Inputs .............................................................................................................8-8 

 

 

8.3.5  Environmental............................................................................................................8-8 

 

 

8.3.6  Hazardous Area Classification.....................................................................................8-9 

 

 

 

8.3.6.1  CSA Hazardous Locations Precautions ............................................................. 8-11