The CVM211 is provided with either a non-linear or a
log-linear analog output.
Non-Linear Output
The first Convectron® gauge controllers produced a
non-linear output signal of 0.375 to 5.659 Vdc for 0 to
1000 Torr of N
2
, roughly in the shape of an "S" curve,
as shown at right. Granville-Phillips® adopted the
same output curve for most of their Mini-Convectron®
modules and controllers with non-linear output
(although in recent years, some Granville-Phillips®
controllers may output variations of the original
S-curve).
The non-linear output from InstruTech convection
gauges, modules, and controllers duplicates the
original S-curve of 0.375 to 5.659 Vdc for 0 to 1.33 bar.
The table shown in section 7.1 contains the lookup
data for converting the non-linear output voltage into
pressure values for nitrogen and various other gases.
Log-Linear Output
Many InstruTech modules and controllers also provide
a log-linear output signal, as an alternative to the non-
linear signal described above. This output, shown at
right, is a 1 Volt per decade signal that may be easier
to use for data logging or control.
The table shown in section 7.2 contains the lookup
data and provides the formulas for converting the
log-linear output voltage into pressure values for
nitrogen and various other gases.
To Next Page
Loading...
Need help?
General
