BEAMEX MC5-IS - Current Measurement Parallel to a Test Diode, Connections

95
Current Measurement Parallel to a Test Diode, Connections
The impedance of MC5-IS’ milliampere input is low enough to enable current measure-
ment parallel to a test diode in a 20 mA circuit. Connection:
Plus Side Test Diode Minus Side Test Diode
MC5-IS parallels the test diode of the transmitter and measures
the externally supplied output current of the transmitter. For more
information concerning test diode connections of HART instru-
ments, see Appendix 1, chapter Connecting MC5-IS and a HART
Instrument on page 131.
Note.
In higher temperatures: The leakage of the diode in the instrument
may affect the accuracy.
T/C, Low V
HART
®
I
meas/sink
V, ,
V, I ,
sink
Com
R, RTD
Low V
MEASUREOUTPUT
ET E
T/C INT. RJ
SENSOR MEASURE & SIMULATE
Uo: 16 V
Io: 24 mA
Po: 145 mW
T/C
WIRES
ONLY
4 w meas
3 w measmeas/sim
+
I
Input signal
X
+
-
I
meas/sink
Com
T/C, Low V
HART
®
I
meas/sink
V, ,
V, I ,
sink
Com
R, RTD
Low V
MEASUREOUTPUT
ET E
T/C INT. RJ
SENSOR MEASURE & SIMULATE
Uo: 16 V
Io: 24 mA
Po: 145 mW
T/C
WIRES
ONLY
4 w meas
3 w measmeas/sim
+
I
Input signal
X
+
-
I
meas/sink
Com
Additional Information