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less than either of the two resistors alone. The value of the equivalent resistance
is calculated as shown in the figure below:
Onboard 250 ohm
resistor selected using
three-pin shunt
1
R1
250 Ohm
Equivalent Resistance =
2104349 rev. AD
External to
Flowmeter
flowmeter
+
3
R2
250 Ohm
-
R1 x R2
R1 + R2
2-wire (line powered)
4-20ma transmitter
External resistor added
across onboard resistor
250 x 250
62500
=
=
500
250 + 250
VCC
125 Ohms
=
Page 37
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