Flammable Products; Equipment Category - Siemens SITRANS F Series Additional Operating Instructions

SITRANS FX330

2.3 Flammable products

Atmospheric conditions
An explosive atmosphere is a mixture of air and flammable gases, vapours, mists or dusts under
atmospheric conditions.
It is defined by the following values T
11.6...15.9 psi.
Outside of this range, for most mixtures no key figures are available for the ignition behaviour.
Operating conditions
Vortex flowmeters operate outside of atmospheric conditions, which means that explosion
protection according to the ATEX directive, regardless of the zone assignment, is fundamentally
not applicable due to the lack of key safety data for the interior of the measuring section.
CAUTION!
Operation with flammable products is only permitted as long as no explosive fuel/air mixture
builds up on the inside of the flowmeter under operating conditions. The operator is responsible
to ensure that the flowmeter is operated safely in terms of the temperature and pressure of the
products used.
In case of operation with flammable products the measuring units must be included in the
periodic pressure tests of the system.

2.4 Equipment category

Vortex flowmeters are designed in category II 2 G / II 2 D or EPL Gb and EPL Db according to
EN 60079-0, EN 60079-1 and EN 60079-31 for use in zone 1 or zone 21. The inside of the
measuring unit is also approved for zone 1.
Vortex flowmeters are designed according to the "IECEx-Scheme" according to "Equipment
Protection Level [EPL] Gb or [EPL] Db".
INFORMATION!
Definition of zone 1 according to EN 1127-1, Appendix B:
An area in which an explosive atmosphere, as a result of the mixture of flammable substances in
the form of gas, steam or mist with air, under normal operation may occasionally occur.
Definition of zone 21 according to EN 1127-1, Appendix B:
An area in which an explosive atmosphere may occasionally occur in the form of a cloud of
flammable dust in the air under normal operation.
09/2018 - A5E40861058-AB
= -20...+60°C / -4...+140°F and P
atm
www.siemens.com/flow
DEVICE DESCRIPTION
= 0.8...1.1 bar /
atm
2
7