iv
Figures
Figure1 TopView............................................3
Figure2 RearPanel ..........................................15
Figure3 FrontPanel..........................................16
Figure4 Welland Insert ........................................17
Figure5 WellInsulator Top View ....................................19
Figure6 ControllerFunction Flowchart .................................24
Figure7 SwitchTest Data .......................................31
Figure8 Welltemperature fluctuation at various proportional band settings ..............35
Figure9 SerialCable Wiring Diagram .................................43
Figure10 9105Wiring Diagram ....................................61
Figure11 9107Wiring Diagram ....................................62