Siemens SITRANS F Series Operating Instructions Manual page 58

Commissioning
6.1 Basic safety notes
Hazardous contact voltage
Risk of injury through hazardous contact voltage when the device is open or not completely
closed.
The degree of protection specified on the nameplate or in Technical data (Page 145) is no
longer guaranteed if the device is open or not properly closed.
● Make sure that the device is securely closed.
Loss of explosion protection
Risk of explosion in hazardous areas if the device is open or not properly closed.
● Close the device as described in Installing/mounting (Page 27).
Opening device in energized state
Risk of explosion in hazardous areas
● Only open the device in a de-energized state.
● Check prior to commissioning that the cover, cover locks, and cable inlets are assembled
Exception: Devices having the type of protection "Intrinsic safety Ex i" may also be opened
in energized state in hazardous areas.
Hazardous gases in the enclosure
Risk of explosion.
Hazardous gases are gases that can explode and have a gas concentration of more than
25% of the lower explosion limit (LEL). Under normal ambient conditions the LEL is the risk
threshold when handling these gases. However, special operating conditions can lower the
potential risk from these gases under the LEL. A value of 25% of the LEL is regarded as
definitely safe.
● Do not introduce combustible or hazardous gases into a restricted-breathing enclosure
58
WARNING
WARNING
WARNING
in accordance with the directives.
WARNING
(type of protection Ex nR).
FC310 (From firmware 4.0)
Operating Instructions, 06/2018, A5E44036384-AA