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4 The Thermocouple Gauge Module
Figure 4-3
Thermocouple Gauge Pressure Analog Output.
4.3.3 Filament Auto Turn-On
TCA may be used to automatically turn on IG1,
and TCB to turn on IG2. Auto turn on occurs
when the TC pressure drops below the setpoint
defined by the auto turn-on adjustment
potentiometers, 77 and 79 . The IG will also
automatically be turned off when the pressure
rises above this point.
The automatic on/off function will execute only
once per setpoint crossing. For example, the IG
may be turned off manually when below the
setpoint, and the auto-on function will not turn it
back on again until TC pressure has risen above
the setpoint and once again dropped below.
The auto turn-on pot is marked with rough
pressure calibration markings. To set the
pressure at which the IG will turn on with falling
TC pressure, and off with rising pressure, simply
adjust the pot to point to the desired pressure.
Figure 4-4
Thermocouple Gauge Module, Front Panel.
67
Series 307 Vacuum Gauge Controller
Instruction Manual - 307024 - Rev. C