Figure 3-2: Installation on One Tank
A. Rosemount 2410 Tank Hub
B. Rosemount 2230 Display
C. Rosemount 5900S Radar Level Gauge
D. Rosemount 2240S Temperature Transmitter
E. Tankbus
F. 300 m
G. Voltage drop=1.4 V
The total operating current of the connected field devices on the tank is 50+30+30
mA=110 mA. This is within the output capability of the Rosemount 2410 Tank Hub.
Calculations
The tank hub is powered by an intrinsically safe power supply: 12.5 V, 250 mA.
Voltage drop to the tank: 110 mA x 0.30 km x 42 Ω/km=1.4 V.
Voltage at the tank =12.5 V - 1.4 V=11.1 V.
Result: the input voltage of 11.1 V to the field devices is above the minimum requirement
of 9 V.
Related information
Power budget
Example 2
The second example, illustrated in Figure 3-3, includes two tanks with a Rosemount 2410
Tank Hub acting as power supply to the field devices on both tanks.
The first tank is located 300 m away from the Rosemount 2410 Tank Hub and the second
tank a further 350 m away.
Both tanks have two field devices: a Rosemount 5408 Radar Level Transmitter and a
Rosemount 644 Temperature Transmitter. The total current consumption of the two
devices is 32 mA (see Table 3-2).
Reference Manual Installation
00809-0100-2410 December 2019
Rosemount 2410 Tank Hub 37
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