XA00677F-A Micropilot FMR50/51/52/53/54/56/57
18 Endress+Hauser
Overvoltage protection
• If an overvoltage protection according to IEC/EN 60079-14 against atmospheric over voltages is required:
no other circuits may leave the housing during normal operation without additional measures.
• For installations which require overvoltage protection to comply with national regulations or standards (e.g.
IEC/EN 60079-14), install the device using overvoltage protection (e.g. HAW56x from Endress+Hauser).
• Observe the safety instructions of the overvoltage protection.
Optional specification, ID Nx (Accessory Mounted) = NA
(Overvoltage protection (TRC [16], type OVP10 and TRC [17], type OVP20)
• The internal overvoltage protection meets the requirements of IEC/EN 60079-14 section 12.3.
• The intrinsically safe input power circuit of the device is isolated from ground. If the device is only equipped
with one input, the dielectric strength of the input is at least 290 V
rms
. If the device is equipped with more
than one input, the dielectric strength of each individual input to ground is at least 290 V
rms
, and the
dielectric strength of the inputs vis-à-vis one another is also at least 290 V
rms
.
Safety instructions:
Zone 0
• In the event of potentially explosive vapor/air mixtures, only operate the device under atmospheric
conditions.
– Temperature: –20 to +60 °C
– Pressure: 80 to 110 kPA (0.8 to 1.1 bar)
– Air with normal oxygen content, usually 21 % (V/V)
If no potentially explosive mixtures are present, or if additional protective measures have been taken
according to EN 1127-1, the device may also be operated under non-atmospheric conditions in accordance
with the manufacturer's specifications.
• Associated devices with galvanic isolation between the intrinsically safe and non-intrinsically safe circuits are
preferred.
• Only use the device in media to which the silicone rubber potting compound of the electronic insert and the
housing made of PBT, aluminum or 316L have sufficient durability.
• If there is a risk of dangerous potential differences within Zone 0 (e.g. through the occurrence of atmospheric
electricity), implement suitable measures for intrinsically safe circuits in Zone 0 (e.g. in accordance with the
requirements of IEC/EN 60079-14).
Temperature tables ä 29
"
Caution!
Optional specification, ID Nx (Accessory Mounted) = NA
(Overvoltage protection (TRC [16], type OVP10 and TRC [17], type OVP20)
• When using the internal overvoltage protection: Reduce the admissible ambient temperature at the housing
by 2 K.
Basic specification, Position 5 (Housing) = A
• When using the remote display FHX50 (DEK12.0046X or DEKRA 12ATEX0151X): Reduce the admissible
ambient temperature at the housing by 3 K.
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