Siemens SITRANS LR250 Operating Instructions Manual page 53

Special conditions for safe use (denoted by X after the certificate number)
● Parts of the enclosure may be non-conducting and may generate an ignition-capable level of
electrostatic charge under certain extreme conditions. The user should ensure that the
equipment is not installed in a location where it may be subjected to external conditions (such
as high-pressure steam), which might cause a build-up of electrostatic charge on non-
conducting surfaces.
● Aluminium, magnesium, titanium or zirconium may be used at the accessible surface of the
equipment. In the event of rare incidents, ignition sources due to impact and friction sparks
could occur. This shall be considered when the SITRANS LR250 FF is being installed in
locations that specifically require Equipment Protection level Ga or Da.
● The equipment shall be infallibly bonded according to the relevant code of practice.
● The end use must ensure that the explosion protection and ingress protection of IP64 is
maintained at each entry to the enclosure by use of a blanking element or cable entry device
that meets the requirements of the protection concepts type 'n' or increased safety 'e' or
flameproof 'd'.
SITRANS LR250 (FOUNDATION FIELDBUS)
Operating Instructions, 08/2014, A5E32221411-AC
5.4 Instructions specific to hazardous area installations
Connecting
53