7-3
Figure 7-2 Basic mA Wiring
Figure 7-3 HART/Analog Single-Loop Wiring
+
–
mA1
mA2
+
–
820
Ω
maximum loop resistance
420
Ω
maximum loop resistance
820
Ω
maximum loop resistance
For HART communications:
• 600
Ω
maximum loop resistance
• 250
Ω
minimum loop resistance
+
–
HART-
compatible host
or controller
Instruction and Operation Manual
X-CM-QmBS-eng
Part Number: 541B052AHG
June, 2008
Section 7 I/O Wiring FM CIO Transmitter
QmBS Sensor / QTA Transmitters