Dynasonics D7700 Series Insertion Doppler Ultrasonic Flow Meter - Manual (Page 23)

Rev. 2/00
-3.5- 77X
Figure 2.3 D7700 Operated with 12-24 Vd
c Power Supply
02/02/2
000
R110 [DAMP] Control Adjust R110 [DAMP] to
stabilize flo
w
rate
and o
u
tput rea
d
in
gs. Adjust CCW
to in-
crease the res
pons
e of the in
strument; adju
s
t
CW
to decreas
e respo
n
se tim
e
(smooth the
displ
a
y rea
d
in
g
s
and out
puts).
CT
R Output C
onn
ectio
n
s
T
he C
T
R output is desig
ne
d to oper
ate both
electro
n
ic an
d
electrom
echa
ni
cal totaliz
ers.
T
he output can
drive lo
ads as
lo
w
as 9
0
ohms. Control
R90 [CT
R
] adjusts the span
of this output. S
w
itc
h
set SW
1 controls the
CT
R output b
y
factors of
X10.
See detai
ls in
the manu
al d
e
scribin
g CT
R adjustme
n
t.
Isolat
ed 4
-20m
A
Output C
onn
ectio
n
s
Ther
e ar
e t
w
o methods
to c
o
n
nect t
h
is
outp
u
t:
•
To op
era
te th
e
4-20mA
loop
fro
m
the
same D
C
suppl
y
operating th
e
flo
w
meter,
conne
ct j
u
mper
w
ires from +B
/12V
to 4-
20+ a
nd f
rom GN
D
to IS
OGND
. C
onnec
t
the 4-
20mA
loo
p
load
betw
een 4-20+
and
4-20-
.
•
If the
targ
et’s
(c
hart r
e
co
rder
, d
a
talog
ger
,
etc.)
inte
rnal
D
C
po
w
e
r source
is uti
lize
d
to pow
er the 4-
20mA
loop, C
o
nnect
the
IS
OGN
D
terminal to t
he t
a
rg
et’s
grou
nd,
the ta
rget
’s +D
C
output
to 4
-2
0
+ termi
nal
and t
he ta
rget
’s
4-20mA
inp
u
t t
o
the
4-
20mA
–
terminal
.
C
ontrol R
100
[4
mA
] is used
to
adjus
t 4mA
offset
and
R
50 [
20mA
] to adj
ust
20mA
span.
F
lo
w
R
a
te
R
e
lay
C
onnection
s
The D
3
0
0
/D
301
is eq
uipp
ed w
it
h
a fl
o
w
rate
contr
o
l r
e
la
y
. The rel
a
y
is desi
gned
to c
ontr
o
l
loads
to 2
50 V
a
c and
10A
.
The
relay
activ
a
te
s
w
hen the flow
r
a
te is
les
s
th
an
the s
e
t po
int.
Activatio
n
is
ind
icate
d b
y
D23 [LED]. The r
e
la
y
setpo
int i
s
co
ntr
o
lled
b
y
adjusti
ng R
70 [A
LM]
there
is a
lso
a a
larm del
a
y
feature tha
t re
quir
e
s
the al
arm co
ndit
ion to
be
pres
e
n
t for
a p
e
rio
d
of time b
e
for
e
r
e
la
y
acti
v
a
tio
n
.
The
delay
can
be in
crea
sed
b
y
adju
s
ting
R
80 [
D
E
L
AY
] C
W
.
Po
w
e
r Su
ppl
y
Jumper Pl
ace
m
ent
12-24 Vdc
Does not matter
Fu
se
T
he fuse provides protecti
on
for AC po
w
e
re
d
units on
ly
. DC
po
w
e
r sources
shou
ld b
e
conn
ected
w
it
h
a 0.25A curre
nt limiter [fuse]
in the pos
itive
supp
ly
lin
e.
12-24 V
d
c Pow
e
r Conn
ection
s
Conn
ect a DC
pow
er source c
apabl
e of sour
c
-
ing 0.2A to the terminals mar
k
e
d
+B/12V
and
GND. The DC
pow
er source w
ill operate all
function
s of the
D300/D3
01 ex
cept the iso-
lated 4-20m
A o
u
tput. See the
box
des
cribing
Isolated 4-2
0
m
A
Output for co
nne
ction details
.
0-1 mA Output Con
nectio
n
T
h
is output is desig
ned to dr
iv
e loa
d
s up to
150
0 ohms. Use R60 [1mA] control to ad
jus
t
span. T
ransducer Co
nnecti
ons
Con
nect the fo
ur
w
ires from the t
w
o coa
x
ial
cabl
es to the respectiv
e
termi
nals. W
ire
markers on the
coa
x
ia
l cabl
es
identif
y the “R”
and the “T
” pair. Do not run these ca
bl
es
adj
acent to AC
po
w
e
r ca
bles.
R10 [GAIN]
Co
ntr
o
l
After all elect
ric
al
a
nd tra
n
s
duc
er
c
o
n
nec
tio
n
s
hav
e b
e
e
n
ma
d
e
, t
he
GAIN c
o
ntr
o
l is s
e
t t
o
matc
h li
quid
a
n
d
pi
pe
pa
ra
met
e
rs.
T
o
p
ro
p
-
erl
y
s
e
t t
h
e
R1
0 [GAI
N
], t
h
e
pi
pe
mus
t b
e
f
u
ll
o
f a f
low
in
g liq
uid
. St
art
w
ith
th
e co
ntr
o
l f
u
lly
CCW [co
unt
er
clock
w
is
e]. A
d
ju
st CW
un
til
D21 [th
e
LED
]
ju
st be
gins to
fl
ash ste
adil
y
.
L
O
W
V
e
lo
c
ity
F
ilt
e
r
For
m
eas
uri
ng fluid
v
e
lo
cities
up
to
20 FPS
[6
MPS] s
e
t t
he
tw
o
s
w
itc
h
e
s
at
SW2 to
OPEN.
If continuous fl
ow
rate
w
ill
not exceed
2 FPS
[0.6
MPS] tu
rn the t
w
o s
w
itc
h
e
s
ON.