23
CAUTION:
GI-M2 / GI-D7
Degassing can be performed in all measurable pressure ranges. If degassing is
performed at a high pressure, the sensor head may be contaminated, contrary to your
expectation. It is recommended to perform it at a pressure below 10
-4
Pa (10
-6
Torr).
DEGAS can work even that the time of abnormality an emission electric current.
ＧＩ－Ｎ８
Pressure is not measured during degassing. See to it that pressure in the piping does
not rise noticeably during degassing. (Filament protection circuit is invalid.)
Degassing can be actuated when measured pressure is 6.6 × 10
-4
Pa (1.0 × 10
-6
Torr) or less.
The setpoint output is OFF during degassing.
7.3.Emission Current (GI-N8 Only)
The emission current is 0.5 mA when
power is ON.
A single press on the F1
key sets the
emission current to 5.0 mA. A second
press on the key sets the emission current
to 0.5 mA.
The emission current is indicated on the
[0.5mA or 5.0mA] lamp on the front
The emission current 5.0 mA cannot be changed over unless the measured pressure is
below 6.6×10
-4
Pa (5.0 × 10
-6
Torr).It will automatically be changed over to 0.5 mA if
pressure rises above 6.6 × 10
-4
Pa (5.0 × 10
-6
Torr) when pressure is being measured at 5.0
mA.
If the pressure lowers, the emission current will not be changed over automatically.
When power is on, the emission current setting is stored in memory even if the filament
is turned off, but it will be changed over to 0.5 mA when the power is turned off.
The pressure in the sensor head will change with change of the filament temperature
immediately after the emission current is changed over from 0.5 mA to 5.0 mA. The
reference value does not change because the time required for the pressure to be stabilized
varies with the environment under which the sensor head is used.
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