Emerson Process Management Rosemount 2410 manual Example, Reference Manual

Reference Manual

Rosemount 2410

300530EN, Rev BA September 2012

Example 1

The example illustrated in Figure 3-2includes a tank located 300 m away from a Rosemount 2410 Tank Hub acting as power supply. In the calculations below it is assumed that the cable length between the field devices on the tank can be ignored.

The tank is equipped with the following field devices: a Rosemount 5900S Radar Level Gauge, a Rosemount 2240S Multi-input Temperature Transmitter, and a Rosemount 2230 Graphical Field Display. The total current consumption of the three devices is 110 mA (see Table 3-2).

Figure 3-2. Example installation with one tank

2410 Tank Hub with intrinsically safe power supply:12.5 V, 250 mA

Tankbus

2230 Display	2240S Temperature
	Transmitter
	5900S Radar
	Level Gauge

300 m

Voltage drop=1.3 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.

The 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.

The input voltage of 11.1 V to the field devices is above the minimum requirement of 9 V.

3-10 Section 3. Installation