Wilks Enterprise Inc InfraRan Instruction Manual
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18.0 Optional Accessories :
18.1 Analog Output :
The InfraRan Specific Vapor Analyzer can be equipped with an optional analog output
that is available through a BNC connector on the end of the analyzer below the
standard terminal block. The analog signal range is 0 – 5 Vdc. This signal is
proportional to the digital concentration value that is displayed on the vacuum
fluorescent display and reported in the serial data string. It is generated by an eight bit
digital-to-analog converter (DAC). The correspondence between the analog signal and
the digital value is determined by the Range setting found in the Setup->Calibrate->Edit
menu. Some typical values are shown below
Selected Range Concentration @ 5V Concentration Step Size
2 ppm 2 ppm 0.0078 ppm
5 ppm 5 ppm 0.0196 ppm
10 ppm 10 ppm 0.0392 ppm
50 ppm 50 ppm 0.196 ppm
100 ppm 100 ppm 0.392 ppm
500 ppm 500 ppm 1.96 ppm
It is the responsibility of the user to keep track of the correspondence between the
analog signal level and the concentration.
A
n
a
l
o
g
O
u
t
p
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t
0
-
5
V
D
C
Shell of connector
( - ) Gnd
Connector center conductor
(+) Pos.
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