Datasheet

8
®
RCV420
FIGURE 8. RCV420 Used in Conjunction with XTR101 to Form a Complete Solution for 4-20mA Loop.
0.01µFQ
1
1N4148
–12V
1µF
5
4
2
3
15
13
14
11
10
12
1µF
V
O
= 0 to 5V

RCV420
16
+12V
8
7
9
E
B
14
11
12
13
4
3
2
XTR105
R
CM
= 1kΩ
1
0.01µF
R
Z
137Ω
R
LIN1
5760Ω
R
G
402Ω
RTD
Pt100
100°C to
600°C
6
R
G
R
G
V
IN
–
V
IN
+
V
LIN
I
R1
I
R2
V
REG
V+
I
RET
I
O
10
I
O
= 4mA – 20mA
NOTE: A two-wire RTD connection is shown. For remotely
located RTDs, a three-wire RTD conection is recommended.
R
G
becomes 383Ω, R
LIN2
is 8060Ω. See Figure 3 and
Table I.
FIGURE 9. Isolated 4-20mA Instrument Loop (RTD shown).
5
4
2
3
15
13
14
11
10
12
RCV420
16
16
2
15
10
8
7
9
V–
V
O
V+
0 – 5V
ISO122
1
+15V
0
–15V
1µF
1µF
Isolated Power
from PWS740
0.01µFQ
1
1N4148
8
7
9
E
B
14
11
12
13
4
3
2
XTR105
R
CM
= 1kΩ
1
0.01µF
R
LIN1
R
G
R
LIN2
RTD
6
R
G
R
G
V
LIN
I
R1
I
R2
V
REG
V+
I
RET
I
O
10
I
O
= 4mA – 20mA
V
IN
–
V
IN
+
R
Z
NOTE: A three-wire RTD connection is shown.
For a two-wire RTD connection eliminate R
LIN2
.