SECTION IV
OPERATION INSTRUCTIONS
NOTE:
It is desirable to read these instructions if full use is to be made of the many
features designed into this controller.
4.1 Purpose of Controls (Left to right) (Refer to Fig. 4-1) ··
Power Switch - Supplies power to the entire unit when switch is placed in the on
position.
Power-On Indicator - indicates the status of the power
TC II I Set - recessed pot for adjusting the set point where the TC II I process relay
energizes.
TC # I Zero - recessed pot for adjusting the TC II I zero.
TC 112 Zero - recessed pot for adjust the TC 112 zero.
TC 112 Set - recessed pot for adjusting the set point where the TC 112 process relay
energizes and/or the ion gauge filament on/off circuit is controlled.
Degas Light - indicates the status of the degas power.
Degas Switch - switches the degas power to the gauge tube grid.
PC Set II I - recessed pot for adjusting the set point corresponding to decade and meter
reading where the IG process relay II I energizes.
PC Set 112 - recessed pot for adjusting the set point corresponding to decade and meter
reading where the IG process relay 112 energizes.
Fi lament Switch (270004, 270017, 270022) - three position switch that controls filament
status.
I .
Auto On (down) - control of the filament is by use of the TC 112
process set point.
2.
Center - intermediate position.
3.
On/Off (up)- spring loaded position which reverses filament state each
time toggled.
Filament Switch (all other models) - spring loaded switch that changes the filament
state each time toggled.
Filament Light - indicates the status of the filament.
Emission Switch - spring loaded switch that in the adjust position displays a reading
corresponding to the emission current on the ion gauge meter.
Emission Adjust - recessed pot used to adjust the emission current to the recommended
value depending upon gauge tube sensitivity.
Decade Lights - indicates pressure decade.
4-1
