Vito Interface Wiring To Tank Level Gauge; Cable Requirements - Honeywell Enraf VITO 762 Installation Manual

3.2

VITO Interface wiring to tank level gauge

The VITO-MTT/LT/MRT Interface connection to associated Honeywell Enraf instrument is
by a single twisted pair cable. The single pair provides both intrinsically safe supply to the
interface as well as data communication between the interface and the associated gauge.
The VITO-CEPS Interface (used with the 365 MPT temperature and water probe) requires
a double twisted pair cable.
The cable to the gauge is fed through the side threaded opening of the VITO Interface.
Note:
Local and company requirements must be followed for routing of intrinsically safe
wiring.
Power rating:
 VITO-MTT & VITO-LT Interface
 VITO-MRT Interface
Refer to the level gauge manual for details on the wiring in the level gauge.
3.2.1

Cable requirements

Keep cable length between 762 VITO Interface and associated instrument as short as
possible.
The connection to the instrument must be made with shielded cable.
Cable requirements are:
 Single twisted pair and shielded (with 361 VITO MPT probe, 76x VITO probes
 Double twisted pair and shielded (with 365 VITO MPT / water probe)
 R : 25  / line
max
B B
 C : 1 μF
max
B B
 L : 15 mH
max
B B
Wiring to 762 VITO Interface shall be protected against EMC influences.
Note:
It is required to use metallic cable glands to provide good contact between cable shield
and VITO Interface enclosure.
The shield of the cable shall be connected inside the cable gland.
Note:
Shielding must be connected externally to the VITO Interface enclosure and
Associated instrument, or in the cable glands; thus never inside the VITO Interface
enclosure.
and MRT)
Caution
Installation guide 762 VITO interfaces & VITO probes
Electrical installation
: 15 Vdc nominal; 5.5 mA
: 15 Vdc nominal; 7.0 mA
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