Emerson Micro Motion 5700 Installation Manual page 9

Installation Manual
MMI-20075112
Note
For DC power:
• Power requirements assume a single transmitter per cable.
• At startup, the power source must provide a minimum of 1.5 amps of short-term current per transmitter
and not pull voltage below 18 VDC.
• Length and conductor diameter of the power cable must be sized to provide 18 VDC minimum at the
power terminals, at a load current of 0.7 amps.
Cable sizing formula
M = 18V + (R x L x 0.5A)
• M: minimum supply voltage
• R: cable resistance (in Ω/ft)
• L: cable length (in ft)
Typical power cable resistance at 68 °F (20.0 °C)
Wire gauge
14 AWG
16 AWG
18 AWG
20 AWG
2
2.5 mm
2
1.5 mm
2
1.0 mm
2
0.75 mm
2
0.50 mm
2.3.1 Maximum cable lengths between sensor and transmitter
The maximum cable length between the sensor and transmitter that are separately installed is determined by
cable type.
Cable type
Micro Motion 4-wire remote mount
Micro Motion 9-wire remote mount
User-supplied 4-wire
Installation Manual
Resistance
0.0050 Ω/ft
0.0080 Ω/ft
0.0128 Ω/ft
0.0204 Ω/ft
0.0136 Ω/m
0.0228 Ω/m
0.0340 Ω/m
0.0460 Ω/m
0.0680 Ω/m
Wire gauge
Not applicable
Not applicable
VDC 22 AWG (0.326 mm²)
August 2020
Maximum length
• 1,000 ft (305 m) without Ex-
approval
• 500 ft (152 m) with IIC rated
sensors
• 1,000 ft (305 m) with IIB rated
sensors
60 ft (18 m)
300 ft (91 m)
Planning
9