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13
Service Manual
Third edition, June 1997
2 General Information
Note: If TankRadar system needs to be switched off, check with
officer in charge that it is OK to interrupt the operation of the
system.
2.1 Safety
When connecting equipment in hazardous areas, certain
requirements must be fulfilled to provide protection against
explosion . There are requirements both for the equipment in
the hazardous area on deck and for the associated equipment
in non-hazardous area.
The Saab TankRadar system is intrinsically safe and meets
the requirements of all the major classification societies. The
Transmitters and deck units connected to them, have the
following safety approval code:
• EEx ia IIC T4 according to EN50014 and EN 50020
(European Norm)
All other optional equipment such as Portable Readout Sys-
tem, separate high level alarm system, supplied by Saab
Marine Electronics, placed in hazardous areas, is also intrin-
sically safe and meets the requirements of all the major clas-
sification societies.
Intrinsic safety is based on the principle of restricting electri-
cal energy available in hazardous-area circuits, so that any
sparks or hot surfaces, that may occur as a result of electrical
faults in components, are too weak to cause ignition. To
accomplish this, zener diodes and current limiting resistors
in the Level Unit restrict the maximum voltages and currents
into the Transmitters.
Intrinsic safety is the only technique accepted for Zone 0
hazardous areas. It is also safe for the crew or the service
personnel and it allows the equipment to be maintained
while the ship is in operation.
IMPORTANT!
For trouble shooting and repair work of intrinsically safe
equipment or associated equipment, the following rules need
to be strictly followed:
- Working permit
- Use only original spare parts from Saab Marine Elec-
tronics. Any replacement with non-recognized spare
parts will jeopardize the intrinsic safety.