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Rosemount 3150 Series
Reference Manual
00809-0100-4835 Rev BE
February 2018
viii
Contents
Overview................................................................................................... 45
Transmitter Theory of Operation............................................................... 46
The Sensor Cell........................................................................................
47
Demodulator.............................................................................................
48
Oscillator................................................................................................... 48
Voltage Regulator.....................................................................................
48
Current Control.........................................................................................
49
Current Limit.............................................................................................
49
Reverse Polarity Protection......................................................................
49
Overview................................................................................................... 51
Safety Messages......................................................................................
51
General Considerations............................................................................
52
Test Terminal............................................................................................ 54
Electronics Assembly Checkout...............................................................
54
Sensor Module Checkout.........................................................................
55
Disassembly Procedure............................................................................ 56
Process Flange Removal............................................................. 57
Electronics Housing Disassembly................................................ 57
Reassembly Procedure............................................................................
59
Electronics Housing Reassembly................................................
59
Process Flange Reassembly.......................................................
63
Post Assembly Tests................................................................................
64
Overview................................................................................................... 69
Safety Messages......................................................................................
69
General Considerations............................................................................
71
Spare Parts Storage and Shelf Life..........................................................
71
Impact on Transmitter Qualified Life......................................................... 72
Transmitter Spare Parts List.....................................................................
73