Rev.
10/22/01
HGM300/RDM800
mini
manual.doc
15
Working
with
the
diagnostic
screen
Overview
The
Diagnostic
Screen
displays
reference
values
for
use
by
repair
technicians.
From
the
top
level
Zone
Screen
press
the
SYSTEM
key
to
go
to
the
System
Screen
.
Press
the
Diagnostic
key
to
view
the
reference
values.
Diagnostic
Screen
Overview
The
diagnostic
screen
contains
sensor
data
and
status
information
useful
for
trouble
shooting
various
fault
conditions.
An
explanation
of
each
line
is
given
below
along
with
normal
operating
ranges.
LINE
1
:
Detector
Voltage
ñ
This
is
the
peak
to
peak
output
of
the
IR
sensor,
in
the
absence
of
refrigerant
this
value
can
range
from
3.900V
to
4.500V.
LINE
2:
Average
Detector
Voltage
ñ
This
is
simply
a
running
average
of
the
values
displayed
in
line
1.
LINE
3:
Zero
Voltage
ñ
This
is
the
IR
sensor
output
that
was
stored
during
the
last
purge
cycle
and
has
the
same
range
as
line
1.
LINE
4:
Noise
ñ
This
is
a
16
point
running
average
of
the
noise
portion
of
IR
bench
output.
This
reading
is
valuable
mainly
when
refrigerant
is
NOT
present.
LINE
5:
Average
Absorbency
ñ
This
is
the
optical
absorbency
computed
from
the
values
in
lines
2
and
3.
In
the
absence
of
refrigerant
the
absorbency
is
approximately
0.000AU.
When
sampling
refrigerants,
itsí
value
varies
proportionally
with
the
refrigerant
concentration.
LINE
6:
uMoles/L
ñ
This
is
the
absolute
concentration
in
micromoles
per
liter
of
refrigerant
base
on
line
4
and
the
internal
calibration.
There
are
2
figures
given.
The
first
(which
is
annotated
by
a
B)
is
the
actual
measurement
at
the
IR
bench.
The
second
is
the
calculated
value
corrected
to
ambient
conditions
(temperature
+
pressure).
LINE
7:
PPM
ñ
Parts
Per
Million
is
the
volume
concentration
referenced
to
standard
temperature
and
pressure
and
is
computed
from
lines
5,
8
and
12.
There
are
2
figures
given.
The
first
(annotated
by
a
B)
is
the
actual
PPM
at
the
IR
branch.
The
second
is
a
PPM
reading
normalized
to
standard
temperature
and
pressure.
LINE
8:
Zero
Temperature
ñ
This
line
contains
the
sensor
and
enclosure
temperature
measured
and
stored
during
the
last
purge
cycle
in
degrees
C.
LINE
9:
Bench
Temperature
ñ
This
is
the
current
IR
sensor
temperature
in
degrees
C
as
well
as
the
raw
voltage
coming
from
the
temperature
sensor
itself.
This
value
can
range
from
ambient
to
ambient
+15
degrees
C.
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