BEAMEX MC5-IS - Using a Compensation Loop; 2-Wire System

94
Advanced Operation and Configuration
Using a Compensation Loop
MC5-IS sources current through the resis-
tor and the compensation loop from the
two left side terminals. MC5-IS measures
the voltage drop across the entire current
loop and across the compensation loop.
If the compensation loop and the connec-
tion wires of the resistor are identical, MC5-
IS can compensate for the resistance of
the connection wires.
When the compensation loop wiring sys-
tem is used, MC5-IS displays the text “3-
wire”.
2-wire System
Calibrator sources current through the re-
sistor and measures the voltage drop
across the same terminals.
The result is acceptable, if the resistance
of the connection wires is low.
R, RTDT/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
R, RTDT/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