Instrutech CVM211 User Manual page 22

Instruction Manual
Analog Output
7
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 , roughly in the shape of an "S" curve,
2
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
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
data and provides the formulas for converting the
log-linear output voltage into pressure values for
nitrogen and various other gases.
InstruTech
contains the lookup
contains the lookup
CVM211 Stinger
Page 19