Inficon VGC083A - 7.3 IG LOG N-11 Analog Output

tinb29e1-c (2019-10) VGC083A_B.om 53
When the analog output is setup, as described in section 6.5.6 for IG LOG N - 11,
the analog output voltage represents the pressured measured by the IG for nitro-
gen/air only. Refer to section 8.3.1 if you are using a gas other than nitrogen/air.
Analog output: IG Log-linear 0 to 10 V (dc), 1 V per decade
A) The log-linear output signal and pressure are related
by the following formulas when units of measurement is
in Torr and mbar:
P= 10
(volts - 11)
V= log
10
(P) + 11
Where P is the pressure in Torr or mbar, and V is the
output signal in volts.
B) The log-linear output signal and pressure are related
by the following formulas when units of measurement is
in pascals:
P= 10
(volts - 9)
V= log
10
(P) + 9
Where P is the pressure in pascals, and V is the output
signal in volts.
Notes: The output voltage will switch to above
+11 V (dc) under the following conditions:
1) The IG sensor is turned off or any IG fault condition.
2) The pressure exceeds 1.00 × 10
-3
Torr at 100 µA
emission current, 5.00 × 10
-4
Torr at 4 mA emission
current, 1.00 × 10
-4
Torr at 10 mA emission current for
BAG05x series ion gauges.
Pressure
[Torr]
Voltage
[V (dc)]
1.00E-11
0.0
1.00E-10
1.0
1.00E-9
2.0
1.00E-8
3.0
1.00E-7
4.0
1.00E-6
5.0
1.00E-5
6.0
1.00E-4
7.0
1.00E-3
8.0
1.00E-2
9.0
5.00E-2
9.698
see notes
≥11
The following chart shows the graphical results of table and formulas above for
pressure measurements in Torr. Pressure is plotted on the X-axis with a log scale;
the output signal is plotted on the Y-axis on a linear scale.
7.3 Analog Output for IG
LOG N - 11 (Nitrogen /
Air only)