Installation Manual

308014EN, Edition 4

Rosemount Tank Radar REX

May 2013

Chapter 11 Electrical Installation of the

 

 

11. Electrical Installation of the REX Gauges

Warning!

Isolate and terminate ends of unused wires. The intrinsic safety may be

 

jeopardized if any cable ends are hanging loose. Use certified battery

 

operated instruments only. Use Rosemount Tank Gauging original spare

 

parts only.

 

 

Note!

See the instructions in the electrical installation drawings for further

 

information. See list of drawings in chapter 12.

 

 

11.1Cabling for Power Supply

Cables used for the power supply connection must be suitable for the supply voltage in question and also approved for use in hazardous area where it is applicable. In the USA, for example, explosion proof conduits must be used in the vicinity of the tank. Appropriate cross sectional area of wires must be used in order to prevent a too high voltage drop to the connected device.

Table 11-1and Table 11-2show examples of typical voltage drops for various cable lengths, wire areas and supply voltages at the maximum power consumption of 80 W (30 W for 24 VDC).

The presented voltage drops should only be treated as guidelines since actual values depend on the particular cable type that is used for the installation. The figures shaded in grey indicate combinations of lengths and areas that might result in too high voltage drops.

Note that the REX gauge can use a wider range of supply voltages than shown in Tables 11-1and 11-2:

•100-240 VAC,

•34-70 VAC,

•48-99 VDC,

•20-28 VDC.

11-1

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Emerson Edition 4, 308014EN installation manual Electrical Installation of the REX Gauges, 11-1, Cabling for Power Supply
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308014EN, Edition 4 specifications

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