Installation And Commissioning; Installation In Connection With Intrinsically Safe Circuits - Pepperl+Fuchs LAL-SRW Manuel

WARNING DEVICE
Safety
1.7

Installation and Commissioning

1.7.1 Installation of the warning device
EN
The device must only be installed outside potentially explosive zones. The device must not
be installed in places with potentially aggressive vapors.
The device must be free of voltage during installation and maintenance. The warning system
must only be connected to the supply voltage after complete mounting and connection of the
sensors.
The identification plate must not be removed.
1.7.2 Connection to sensors for potentially explosive zone
In oil/petrol separators, only sensors that are certified for installation in potentially explosive
zones may be connected.
The type of protection of the external equipment must comply with the protection type specified
for the total system.
1.7.3 Sensor cables
Sensor cables must not be installed in cable or conductor bundles together with other current
circuits. Avoid installing sensor cables parallel to other cables that may transmit interfering
signals, which impair the sensor signal and thus the alarm function. The sensor itself must not
be grounded.
If you extend the sensor cable, observe the applicable ATEX specifications with regard to color,
quality and durability. Use unshielded 2-wire cables with a cross-section of 1 mm² for each
sensor.
1.8

Installation in connection with intrinsically safe circuits

Installation of the intrinsically safe power circuits of the devices is permitted in potentially
explosive zones, whereby, in particular, safe separation from all non-intrinsically safe power
circuits must be guaranteed.
The intrinsically safe current circuits must be installed according to valid setup regulations.
For the interconnection of the intrinsically safe field devices and the intrinsically safe power
circuits of the associated devices, the respective maximum values of the field device and the
associated device with regard to explosion protection must be observed (proof of intrinsic
safety). EN 60079-14/IEC 60079-14 must be observed.
If the used sensors have no withstand test voltage (500 V according to EN 60079-11) between
the external conductive parts and the intrinsically safe circuits, it must be assumed that the
sensors and the corresponding intrinsically safe circuits have electrical contact with each other.
Verification of intrinsic safety circuits must then always include the possibility of connection of
all the intrinsically safe circuits.
6 - EN