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4.3
Cable Protection System
Apply following cable protection measures to protect the connecting cables from
various
factors that affect negatively on the cable lifetime.
4.3.1
Standard Protection System
•
To avoid liquid flowing along with the cable into the terminal box, configure a U-shaped
ring between pull box and pressure transmitter as shown in the figure below.
•
Ensure that the level of U-shaped bottom is maintained below the pressure
transmitter.
•
Use sufficiently long cable considering the maintenance and repair factors.
4.3.2
Explosion-Proof Tube Protection System
•
If the transmitter is situated in dangerous area, use a high-quality metallic explosion-
proof tube as a casing for the cable connecting the transmitter to the terminal box.
4.3.3
Connection to the HART Handheld Communicator
A loop resistance for HART Communicator is between 250Ω and 550Ω. Transmitter operates on 1.9
to 45 VDC. Figure below illustrates the connection details for HHT communicator.
