Emerson Rosemount 370XA System Reference Manual page 72

370XA Gas Chromatograph
APRIL 2014
•
American Wire Gauge (AWG)
Resistance per 1000 feet
Voltage drop per 1000 feet at 2.5A
Maximum length (3V DC power Drop)
Metric Wire Size
Resistance per 100m
Voltage drop at 100m at 2.5A
Maximum length (3V DC power Drop)
To operate correctly the 370XA requires at least 21 VDC at the
terminals on the back plane. When wiring for DC power
connections, you must account for the voltage drop due to the
resistance of the cable. The following tables estimate the
voltage drop and the maximum length of cable with a 24 VDC
supply at the maximum power draw, while the analytical oven
heats up during start-up, of 55 W.
System Reference Manual
7P00370-H01
12 14 16
1.62 2.58 4.08
4.05 6.44 10.21
740 465 293
2.5 1.5
1.3 2.1
3.25 5.25
92 57
Ohms
VDC
Feet
2
mm
Ohms
VDC
meters
3 - 45