Overpressure Shut Down; Degas - Instrutech Hornet User Manual

Instruction Manual
5.3

Overpressure shut down

The IGM401 is provided with factory set default values for overpressure shut down. The gauge will shut off
automatically should the pressure reach or rise above the pressure shut down values shown below:
Emission Current
4 mA
100 µA (0.1 mA)
The 100 μA emission current overpressure shut down setting may be adjusted from 1E-05 Torr to 5E-2 Torr.
5.4

Degas

Degas is used to rid the gauge sensor of adsorbed gas. Degas is achieved by applying Electron Bombardment
(EB) to the grid. The intervals at which degas should be applied vary for each application. The low pressure
measurement performance of the transducer will normally improve after each degassing cycle.

Degas can only be applied while the filament is turned on and operating.

Ensure vacuum level is at or less than 5.00 x 10

Power during degas is about 3 watts higher than the normal operating power.

Degas will automatically turn off after 2 minutes when using factory default settings. Degas can be
programmed for duration of 2 to 10 minutes.

The IGM401 will continue to measure pressure while degas is in progress.

Degas will automatically turn off if the pressure exceeds 3.00 x 10

Degas can be interrupted by turning the IGM401 filament off.
InstruTech, Inc.
Factory set overpressure shut down values
Overpressure Shut
Down (Torr)
-3
1.00 x 10
-2
5.00 x 10
Overpressure Shut
Down (mbar)
-3
1.33 x 10
-2
6.66 x 10
-5
Torr before attempting to initiate degas.
-4
Torr during the degas cycle.
IGM401 Hornet
Overpressure Shut
Down (Pa)
-1
1.33 x 10
6.66
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