Lawrence Berkeley National Laboratory
Recent Work
Title
A MICROCOMPUTER SYSTEM FOR REAL-TIME MONITORING and CONTROL OF GAS
CHROMATOGRAPHS
Permalink
https://escholarship.org/uc/item/9nz444kn
Author
Donaghey, L.F.
Publication Date
1976-04-01
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University of California
' '
u J
Submitted
to
Journal
of
Chromatographic
Science
LBL-4138
Rev.
Preprint
C.
)
A
:MICROCOMPUTER
SYSTEM
FOR
REAL-TIME
MONITORING
AND
CONTROL
OF
GAS
CHROMATOGRAPHS
L.
F.
Donaghey,
G.
M.
Bobba,
and
D.
Jacobs
;,
: ;
~
April
1976
Prepared
for
the
U.
S.
Energy
Research
and
Development
Administration
under
Contract
W
-7405-ENG
-48
For
Reference
Not
to
be
taken from this room
. J
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1
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.---------LEGAL
NOTICE---------
..
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as
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account
of
work sponsored
by
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United
States Government. Neither the United States nor the United
States Energy Research and Development Administration, nor any
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their contractors, subcontractors, or
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or
assumes
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or usefulness
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of
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assumes any legal responsibility for the accuracy, completeness, or usefulness
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of
the
University
of
California.
0 0
A
Microcomputer
System
for
Real-Time
Monitoring
and
Control
of
Gas
Chromatographs
L.
F.
Donaghey,
G.
M.
Bobba
and
D.
Jacobs
LBL-4138
REVISED
Materials
andMolecular
Research
Division,
Lawrence
Berkeley
Laboratory
and
Department
of
Chemical
Engineering,
University
of
California,
Berkeley,
California
94720
April,
1976
Abstract
Microcomputer
systems,
based
on
the
Intel
8008
and
8080
microprocessors,have
been
developed
to
perform
real-time,
on-line
data
acquisition
and
analysis
of
gas
chromatographic
data
and
to
control
sampling
and
operation
of
the
gas
chromatograph.
Real-time
analysis
is
achieved
by
the
novel
method
of
interleaving
subprograms
for
the
sequential
data
acquisition
and
reduction
steps,
thereby
minimizing
memory
requirements.
The
systemcontains
a
real-time
clock
for
signal
timing,
and
interfaces
to
a
teletype
and
di~ital
volt
meter.
An
automated
triac
controller
is
used
to
control
the
temperature
of
the
gas
chromatographic
column,
while
a
matrix
of
relays
is
able
to
actuate
sampling
values.