Inficon VGC083A - 7 Analog Output Charts & Equations (Nitrogen;Air Only); 7.1 IG-CG1 0.5-7 V Analog Output

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7 Analog Output Charts & Equations (Nitrogen/Air Only)
This section provides various charts & equations for analog outputs available from
the VGC083.
When the analog output is setup, as described in section 6.5.6 for IG -
CG1/CG2/ALT 0.5-7V, the analog output voltage represents a combination of the
IG and CG1 or IG and CG2 or IG and ALT gaue for wide range measurements.
Refer to section 8.3.2 if you are using a gas other than nitrogen/air.
Analog output: Wide Range Log-linear 0.5 to 7 V (dc), 0.5 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 - 5.5)/(0.5)
V = ((0.5 × log
10
(P)) + 5.5
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 - 4.5)/(0.5)
V = ((0.5 × log
10
(P)) + 4.5
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, any IG fault condition
and the CG1 is damaged or disconnected.
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 and CG1 is damaged or dis-
connected.
3) Any IG or CG faults condition while operating in the
IG or CG range respectively.
Pressure
[Torr]
Voltage
[V (dc)]
1.00E-10
0.5
1.00E-9
1.0
1.00E-8
1.5
1.00E-7
2.0
1.00E-6
2.5
1.00E-5
3.0
1.00E-4
3.5
1.00E-3
4.0
1.00E-2
4.5
1.00E-1
5.0
1.00E+00
5.5
1.00E+01
6.0
1.00E+02
6.5
1.00E+03
7.0
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.
7.1 Analog Output wide
range measurement for
IG - CG1 0.5 - 7V
(Nitrogen / Air only)