Kobold DON-05, Operating Instructions Manual

Page: 39 / 48

DON-H
DON-H
01/0721
page 39
s) The ignition limit curves from EN 60079-11 must be taken into account in
Zone 2 without a safety factor and must be observed during installation. The
safety factor 1.5 is to be used in zone 1. A control drawing (system
description) to be created by the installer / operator is required for the
installation of the intrinsically safe circuit.
t) Equipotential bonding must be established along the intrinsically safe circuit.
The certificates, including the special conditions specified therein, must be
taken into account.
u) Within the potentially explosive area, assembly may only be carried out in
accordance with the locally applicable installation regulations. The following
conditions must be observed (incomplete):
a) Installation and maintenance may only be carried out in an explosion-free
atmosphere and in compliance with the regulations applicable in the
operator's country.
b) Additional precautions must be taken if the presence of hydrogen sulfide,
ethylene oxide and / or carbon monoxide is to be expected: These
substances have a very low ignition energy!
c) If these substances are present and if a substance of explosion group IIC
is present and an explosive atmosphere is likely to be present, only non-
sparking tools may be used!
d) The flow meters must not be used in systems with cathodic corrosion
protection; in borderline cases, consult the manufacturer.
e) Particular care must be taken to ensure that no stray currents (e.g.
generated by motors that are operated on frequency converters, welding
systems and / or cathodic corrosion protection systems) are fed through
the flow meter.