Siemens SITRANS FC410 Operating Instructions Manual page 21

If the equipment is placed in a "ta" environment (Zone 20), the maximum process
temperature shall be as follows:
Special conditions for safe use
In general, it is required that:
● The equipment shall not be opened when energized and when an explosive gas or dust
atmosphere may be present..
● Appropriate cable connectors are used.
● Sensor is connected to the potential equalization throughout the hazardous area.
● EN/IEC 60079-14 is considered for installation in hazardous areas.
Further information and instructions including approval-specific special conditions for safe
use in Ex applications can be found in the certificates on the accompanying literature CD
and at www.siemens.com/FC410 (www.siemens.com/FC410).
Laying of cables
Explosion hazard
Cable for use in hazardous locations must satisfy the requirements for having a proof
voltage of at least 500 V AC applied between the conductor/ground, conductor/shield and
shield/ground.
Connect the devices that are operated in hazardous areas as per the stipulations applicable
in the country of operation.
Field wiring installation
Ensure that the national requirements of the country in which the devices are installed are
met.
FC410 with Modbus
Operating Instructions, 02/2016, A5E33120874-AC
Ta (°C) Maximum Process Temperature per Temperature Class (°C)
60
55
50
45
40
35
30
WARNING
WARNING
2.2 Installation in hazardous locations
-40
-10
20
50
80
110
140
Safety notes
19