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Grid degas: 6.3 to 7.5 V at approximately 10 A. - Collector voltage: -20
to -50 VDC with respect to grid. For the purposes of this description, we assume
that the controller is compatible with the typical Bayard-Alpert ion gauge sensor such as the Lesker G075TN which has the
following specs: - Filament voltage: 3 to 5 VAC.
Here is a general procedure for checking out an ion gauge controller
without an ion gauge sensor or vacuum system, or the gadget described in the next section. The team at Maple Leaf is
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go through in the kitchen when your Amana over is out of order.
Nothing coming out of it smells clean. Most common problems encountered with refrigerators are leaking water, ice build up, noises coming
from your refrigerator, and not cooling at all.
However, ion gauge controllers are readily available surplus for
a small fraction of their new cost.
Interlock circuits: These provide protection for the ion gauge
filament from high pressure and the electronics from external short circuits or other faults.
The ion gauge controller typically provides one or more "process control" outputs to switch other equipment based on the measured pressure (not shown).
Some ion gauge tubes have two or more filaments so that if one burns out, another can be
used in its place. Before buying any one of these appliances we should
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Especially when you buy the luxury seal on appliances, you need to know that they are kept well and by the right company.
The actual voltages found on the various pins as well as
emission current range will depend on the design of the controller.
I don't know if there is any benefit to electron bombardment degas but it is certainly more complex and much more dangerous (with 800 V at sizable current availability) present
on the ion gauge tube electrodes as well as the electrometer input during degas.
Typical requirements: 8 V at 10 A. Electron bombardment (less common):
An alternative technique applies a higher voltage difference than used when measuring pressure (up to
800 V peak compared to around 150 VDC) between the filament and grid (which is shorted to the collector), resulting in a current flow of up to 150 mA
or more. 180 VDC at up to the maximum emission current of 0.5 to 2.5 mA, some up to 10 mA or more.
150 VDC with respect to grid. Electrons attracted to the grid
collide with and ionize some percentage of the residual gas molecules in their path.
Grid bias supply: Regulated voltage to attract electrons
from the filament.
The required ion gauge controller subsystems include: Filament power supply:
Filament current is precisely regulated based on desired electron emission current.
Power up the controller with nothing attached and make sure it doesn't do anything terrible.
If homeowners wish to guard themselves from any sort of legal suits which may arise if the company's worker may
get injured while offering his service in your home, then make sure that the specific
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Thus, for a full scale reading of 10-7 Torr, the amplifier must have a full scale sensitivity of 1
nA! Electrometer amplifier: This is a high sensitivity amplifier range selectable between 10-3 and 10-7 Torr full scale (give or take
a an decade or two). Of course, these ion gauge tubes
can't be run at 1 Torr but the ion current scales linearly with pressure.
But basically, it means that at a pressure of 1 Torr, the ion current would be S times the electron current.
Degas power supply: Some means is provided to heat the grid and collector to drive off gases
that may have contaminated their surfaces when the system was at high pressure or up to air.
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