Connecting Or Disconnecting In Explosive Environments - Siemens SITRANS FSS100 Installation Manual

Ultrasonic flowmeters
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Improper laying of shielded cables
Risk of explosion through compensating currents between hazardous area and the
non‑hazardous area.
• Shielded cables that cross into hazardous areas should be grounded only at one end.
• If grounding is required at both ends, use an equipotential bonding conductor.
Uncovered non-intrinsically safe circuits
Risk of explosion in hazardous areas or electric shock when working on non-intrinsically safe
circuits.
If intrinsically safe and non-intrinsically safe circuits are operated in an enclosure with the type
of protection "Increased safety Ex e", the connections of the non-intrinsically safe circuits must
be additionally covered.
• Ensure that the cover of the non-intrinsically safe circuits complies with degree of
• Separate connections of the non-intrinsically safe circuits in accordance with IEC/
Insufficient isolation of intrinsically safe and non-intrinsically safe circuits
Risk of explosion in hazardous areas.
• When connecting intrinsically safe and non‑intrinsically safe circuits ensure that isolation is
• Ensure that you observe the device approvals applicable in your country.
6.2.1

Connecting or disconnecting in explosive environments

Connecting or disconnecting in explosive environments
Connecting or disconnecting a powered device in explosive environments can lead to an
explosion.
• Connect and disconnect in non-explosive environments.
• Remove power to the device before connecting or disconnecting in explosive atmosphere.
SITRANS FSS100
Installation Manual, 12/2023, A5E52595000-AA
WARNING
WARNING
protection IP30 or higher according to IEC/EN 60529.
EN 60079-14.
WARNING
carried out properly in accordance with local regulations for example IEC 60079-14.
WARNING
- or-
Connecting
6.2 Basic safety notes
63

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