•
Press-cables that don’t compromise the IP protection level declared for the enclosure
must be used.
•
For all the device models it is always advisable to install outside of the danger zone, with
zener barriers on the power-supply lines, in order to limit the maximum energy of
possible sparks.
Maintenance
•
If this equipment is installed in a place where the formation of a combustible dust layer is
expected, it is necessary to institute a maintenance plan for the periodic cleaning of the
dust layer. The maximum permissible thickness of these layers is a function of the
maximum surface temperature declared for this equipment (90°C), the type of dust and
other environmental conditions.
Use
•
If tubes of plastic material (e.g. RILSAN) are present in the equipment in order to
measure the pressure inside it, or in order to carry compressed air to a solenoid valve,
those tubes can be a source of static electricity; therefore rubbing of the tubes must be
avoided.
•
The plant designer and the final user must check that no excessive adiabatic air
compression takes place in the inside of the ducts connected to this device, because it
could cause a dangerous temperature rise.
•
Before opening the small transparent window in order to access the controls and
regulators (dip-switch and/or trimmer), it is necessary to disconnect the electric power
supply. The electric charge stored in the internal capacitors will exhaust after a short
time (<10s). If the equipment temperature is abnormally high, it is necessary to wait for it
to cool down, or to dismount it, take it apart and then open it in a zone not subject to
explosive atmosphere.