Emerson Rosemount 2410 Reference Manual page 36

Installation
December 2019
located at the far end of the Tankbus, a total "worst case" cable resistance of
approximately 14 Ω (3.5 V/250 mA) is allowed. This corresponds to a cable length of 333
m (1092 ft) in case typical cable characteristics are assumed as specified in
However, normally the current consumption is less than 250 mA. A typical configuration
would include a tank supplied with a Rosemount 5900S Radar Level Gauge, a Rosemount
2230 Graphical Field Display, a Rosemount 2240S Multi-input Temperature Transmitter,
and a Rosemount 3051S Pressure Transmitter. In this case the current consumption would
be 128 mA allowing a cable length of 677 m (2221 ft) between the Rosemount 2410 Tank
Hub and the field devices on the tank. With fewer devices on the Tankbus, an even longer
cable would be allowed.
Table 3-4
field devices on a tank for different cable cross-sectional areas. The table shows the
maximum distance to a tank at a total current consumption of 250 mA as well as for a
typical installation as outlined above.
Table 3-4: Maximum Distance from Power Source to Field Devices on the Tank for
Different Cable Areas
Cross-sectional area
20 AWG (0.5 mm
18 AWG (0.75 mm
17 AWG (1.0 mm
16 AWG (1.5 mm
Related information
Cable selection for the Tankbus
Example 1
The example illustrated in
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
36
shows the maximum distance between a Rosemount 2410 Tank Hub and the
Cable characteristics
Typical loop
resistance (Ω/km)
2
) 66
2
) 42
2
) 33
2
) 26
Figure 3-2
3-2).
Maximum distance to tank (m/ft)
Maximum Current
consumption (250
mA)
212 (695)
333 (1092)
424 (1391)
538 (1765)
includes a tank located 300 m away from a
Reference Manual
00809-0100-2410
Table 3-3.
Typical installation
(128 mA)
414 (1358)
651 (2136)
829 (2720)
1052 (3451)
Reference Manual