Mod
el
552
8A
Controls. C
onne
ctors,
Indi
ca
to
rs
16-12
To
View the Current
V.O
.
L.
Co
mp
en
sa
ti
on
Numb
er
To
view
the c
urrent
co
mp
ensation
number
, just press the V.O.L. key.
Successive
pr
esses
of
V.D.l.
will give
the
air temperature, the air pressure, and finally the air
humidit
y,
as
s
hown
below
.
Air
Temperature
: E x
x.
x
XCH
E x
x.
x x
FI
Air
Pr
ess
ur
e:
p
x
x.
x x
I
or
I
p
x
x.
x x
mm
in
Relative
Humidity
: H
Since all three
va
l
ue
s are
provid
ed by the
Air
Se
n
so
r, they are either all present
or
all ab
se
nt,
unless a sensor
error
or
failure
ha
s occurred. If the Air Sensor is u
se
d, the compensation
number
is updated
appro
ximately every
thr
ee
sec
ond
s by the Mea
su
rement Display unit.
If
you
se
lect some
other
function
while
an
Air
Sensor value is being displayed, and then pre
ss
V
.O
.L.. the display
will
go
ba
ck
to
s
howing
the
la
st
displayed
Air
Sensor value; s
uc
cess
ive pre
ss
es
of
V.
O.l.
will
cycle
through
the
Air
Sensor values, as de
sc
ribed above.
For example,
if
the air
pre
ss
ure
is
being
monitored,
and you want to momentarily select another
function
,
when
the
V,Q,l.
bullon
is pres
se
d again, the (irst data displayed will be the air pressure.
Successive
pre
sses
of
the V.O.L. key
will
then give air
humidity
and then a
return
to the current
meas
urement
mode.
To
Enter A V.O.
L.
Compen
sa
tion
Numb
er
See
"GENERAL"
inf
ormati on
for
SET
UP
key
s,
above.
N
OTE
S
1.
The M
eas
urement
Di
splay unit accepts a manually-entered
V,O.L.
va
l
ue
only when
an
Air
Sensor is not conneCled
at
its rear
panel.
2.
The allowable range
of
va
lues
for
V.O.L. i
s-
" 0" to "999,9"
The
Mea
s
ur
e
ment
Display unit will also a
llow
you to enter the
value
" 1000.0" . This is a special
case
that
se
ts the V.O,L.
co
mpen
s
ation
numb
er to " 1.
0000000
";
i.e
.;
there
is
no com-
pen
sation.
), If an
Air
Sensor is not co
nne
cted to the Measurement Display,
and you
do
not manually enter a V,Q.L. compensati on
fa
c
tor
;
the
com
pensation
for
"s
tandard" air temperatur
e,
pre
ssu
re. and
humidity
is assigned; this value is "728.8",
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