V100 (2019-11)
Doc. Ref. XGC-320-100119
61
An analog output of 10 volts indicates a faulty convection gauge
or unplugged gauge cable.
The chart on the following page shows the graphical results of
the table and formulas given above for nitrogen. True pressure
(N
2
) is plotted on the X-axis with a log scale. The output signal is
plotted on the Y-axis on a linear scale.
Note - when using the units of pascals and LOG 0-7 is selected,
the same equation of P = 10
(V - 4)
listed above applies. This re-
sults in a log-linear analog output range of about 2.00 V (dc) at
.01 pascals (Pa) and 9.12 V (dc) at 133 kPa.
LOG 0-7; Log-Linear Analog Output Voltage vs. Pressure
[Torr]
Chart of the calculated pressures using the formulas and data for
the log-linear output signal for nitrogen from the previous page.
7.4
Log 0-7; Log-Linear Analog Output Equation
& Table - mbar
Log-Linear 0 to 7 V analog output for selected gases - Engineer-
ing units in mbar (see following table):