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LERBAKKEN 10, 8410 RØNDE DENMARK.
The entity concept
The Transmitter must be installed according to National Electrical Code (ANSI-NFPA 70) and shall be
installed with the enclosure, mounting, and spacing segregation requirement of the ultimate application.
Equipment that is FM-approved for intrinsic safety may be connected to barriers based on the ENTITY
CONCEPT. This concept permits interconnection of approved transmitters, meters and other devices in
combinations which have not been specifically examined by FM, provided that the agency's criteria are
met. The combination is then intrinsically safe, if the entity concept is acceptable to the authority having
jurisdiction over the installation.
The entity concept criteria are as follows:
The intrinsically safe devices, other than barriers, must not be a source of power.
The maximum voltage Ui(V
receive and remain intrinsically safe, must be equal to or greater than the voltage (Uo or V
current (Io or I
or I
) and the power Po which can be delivered by the barrier.
SC
t
The sum of the maximum unprotected capacitance (C
ing wiring must be less than the capacitance (C
The sum of the maximum unprotected inductance (L
wiring must be less than the inductance (L
The entity parameters Uo,V
manufacturer.
NI Field Circuit Parameters
Model 5331D, 5332D, 5333D, 5335D, 5337D and 5343B
Hazardous (Classified) Location
Class I,Division2, Groups, A,B,C,D T4..T6
Class I, Zone 2, IIC T4..T6
Ambient temperature limits
T4: ‐40 to + 85 deg. Celcius
T6: ‐40 to + 60 deg. Celcius
Terminal 1 , 2
Vmax : 35 V
Ci: 1.0 nF
Li:10 uH
Revision date:
2018-08-27
) and current Ii(I
), and maximum power Pi(Pmax), which the device can
MAX
MAX
) which can be safely connected to the barrier.
a
) for each intrinsically device and the interconnecting
i
) which can be safely connected to the barrier.
a
or V
and Io,I
or I
, and C
OC
t
SC
t
1
2
6
3
5
4
SENSOR
Version Revision
V3R0
5331V116-DE
WWW.PRELECTRONICS.COM
) for each intrinsically device and the interconnect-
i
and L
for barriers are provided by the barrier
a
a
Non Hazardous Location
Associated Apparatus
or Barrier
+
‐
This device must not be connected
to any associated apparatus which
uses or generates more than 250
VRMS
5300Q502
or V
) and
OC
t
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