8

®

RCV420

FIGURE 8. RCV420 Used in Conjunction with XTR101 to Form a Complete Solution for 4-20mA Loop.

0.01µF

Q

1

1N4148

–12V

1µF

5

4

2

3

15

13

14

11

10

12

1µF

V

RCV420

16

+12V

8

7

9

E

B

14

11

12

13

4

3

2

XTR105

R

1

0.01µF

R

Z

137

Ω

R

LIN1

5760

Ω

R

G

402

Ω

RTD

Pt100

100°C to

600°C

6

R

G

R

G

V

IN

–

V

IN

+

V

R1

I

R2

V

REG

V+

I

RET

I

O

10

I

NOTE: A two-wire RTD connection is shown. For remotely

located RTDs, a three-wire RTD conection is recommended.

R

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

0.01µF

Q

1

1N4148

8

7

9

E

B

14

11

12

13

4

3

2

XTR105

R

1

0.01µF

R

LIN1

R

G

R

LIN2

RTD

6

R

G

R

G

V

R1

I

R2

V

REG

V+

I

RET

I

O

10

I

V

IN

–

V

IN

+

R

Z

NOTE: A three-wire RTD connection is shown.

For a two-wire RTD connection eliminate R