must have an internal Pollution degree 2 or better according to IEC 60664-1.
Cable entries and dummy elements must meet the same requirements.
Note the following information for installation in a potentially explosive dust atmosphere:
If the transmitter/local display is supplied with an intrinsically safe signal "ic" and has a
connection to an intrinsically safe signal "ic" (e.g. a passive device), it must be installed in a metal
enclosure form B according to DIN 43729 or equivalent that ensures at least IP6X degree of
protection according to IEC 60529.
Cable entries and dummy elements must meet the same requirements.
If the transmitter/local display is supplied with a non-sparking signal "nA/ec" or has a connection
to a non-sparking signal, it must be installed in an enclosure that ensures at least IP6X degree
of protection according to IEC 60529 and that meets the requirements of protection type EX t.
Cable entries and dummy elements must meet the same requirements.
5.1.2 FM/CSA
5.1.2.1 Safety information for installation in "Intrinsic safety "ia"
Hazardous areas CL I, Div 1, GP ABCD CL I, Zone 0 IIC
General installation information
• The installation must be carried out in accordance with the regulations of the US National
Electrical Code (NEC) or in Canada the Canadian Electrical Code (CEC).
• Devices with FM approval for intrinsic safety can be connected to barriers according to the
ENTITY CONCEPT. This concept allows the interconnection of approved transmitters,
measuring instruments and other devices in combinations that have not been specically
investigated by FM, provided that the criteria of the authority are met. This combination is
intrinsically safe if the entity concept is acceptable to the authority responsible for the
installation.
• The entity concept comprises the following criteria: The intrinsically safe devices, with the
exception of barriers, must not be a power source. The maximum voltage Ui (Vmax), the
maximum current Ii (Imax) and the maximum power Pi (Pmax) that an intrinsically safe
device can receive without loss of intrinsic safety must be greater than or equal to the voltage
(Uo or Uoc or Vt), current (Io or Isc or It) and power values Po that can be supplied from the
barrier.
• The sum of the maximum unprotected capacitance (Ci) of each intrinsically safe device and
the connecting cables must be less than the capacitance (Ca) which can be safely connected
to the barrier.
• The sum of the maximum unprotected inductance (Li) of each intrinsically safe device and
the connecting cables must be less than the inductance (La) which can be safely connected
to the barrier.
• The entity parameters Uo, Voc or Vt and Io, Isc or It, as well as Ca and La for barriers are
communicated by the barrier manufacturer.
Installing/mounting
5.1 Basic safety notes
SITRANS TH100/TH320/TH420/TR320/TR420/TF320/TF420 with 4 to 20 mA/HART
Operating Instructions, 05/2020, A5E41864807-AB 63
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