Emerson MICRO MOTION 1700 - Manual (Page 12)

• 18 to 100 VDC, 6 watts typical, 11 watts maximum
• Complies with low voltage directive 2006/95/EC per EN 61010-1 (IEC 61010-1) with
amendment 2, and Installation (Overvoltage) Category II, Pollution Degree 2
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.
• 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 0.5 amps.
Cable sizing formula Figure 1-8:
M
= 18V + (R × L × 0.5A)
• M: minimum supply voltage
• R: cable resistance
• L: cable length
Typical power cable resistance at 68 °F (20 °C) Table 1-6:
Wire gauge Resistance
14 AWG 0.0050 Ω/ft
16 AWG 0.0080 Ω/ft
18 AWG 0.0128 Ω/ft
20 AWG 0.0204 Ω/ft
2.5 mm 2 0.0136 Ω/m
1.5 mm 2 0.0228 Ω/m
1.0 mm 2 0.0340 Ω/m
0.75 mm 2 0.0460 Ω/m
0.50 mm 2 0.0680 Ω/m
1.6 Orientation
You can mount the transmitter in any orientation as long as the conduit openings do not
point upward.
CAUTION!
Upward-facing conduit openings risk condensation moisture entering the transmitter housing,
which could damage the transmitter.
Planning
8 Micro Motion ® Model 1700 and 2700