Installation Manual

308014EN, Edition 4

Rosemount Tank Radar REX

May 2013

Chapter 11 Electrical Installation of the

 

 

11.2Cabling for TRL/2 Bus

The TRL/2 Bus requires a twisted and shielded pair with an area of min

0.50mm2 (AWG 20 or similar). The maximum length of the TRL/2 Bus is approximately 4 km. The TRL/2 Bus can normally use existing cables in the tank area.

Note!

Wherever two or more TRL/2 Buses run alongside each other, sharing

 

the same cable or conduit tube, use twisted and shielded wire and make

 

sure that each pair of bus wires is individually shielded in order to avoid

 

crosstalk.

 

 

 

Cables_shield.eps

 

Figure 11-1. Individually shielded pairs of cables.

11.3 Recommended Cables

 

 

Table 11-3shows typical cable types that can be used for connecting the

 

REX gauge. Other cables of similar type may also be used.

Type

Manufacturing standard

Core Size

Signal

BS 5308 part 1, type 1

1 mm2

Signal (armoured)

BS 5308 part 2, type 1

1 mm2

Power (armoured)

BS 5467

1.5 mm2

Power (unar-

IEC 228, IEC 227

1.5 mm2

moured)

 

 

Intrinsically safe

IEC 228, IEC 227

0.5 mm2

Table 11-3. Example of applicable cable standards.

11.4Grounding

According to national code of practice the Transmitter Head or Data Acquisition Unit can be grounded by connecting an exterior 4 mm2 wire to a potential equalization network, or, if no such exists, to the tank structure. A grounding lug is available on the enclosure for this purpose.

Note!

When the enclosure is connected to a potential equalizing network or to

 

the tank structure, the protective ground with the power supply must not

 

be connected.

 

If the enclosure is not externally grounded, the protective ground with the

 

power supply should be connected.

 

 

11-3

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Emerson Edition 4, 308014EN installation manual 11-3, Cabling for TRL/2 Bus, Grounding
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308014EN, Edition 4 specifications

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