5335QE01
LERBAKKEN 10, 8410 RØNDE DENMARK. WWW.PRELECTRONICS.COM
Revision date:
2014-03-31
Version Revision
V4R0
Page:
2/5
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
MAX
) and current Ii(I
MAX
), and maximum power Pi(Pmax), which the device can
receive and remain intrinsically safe, must be equal to or greater than the voltage (Uo or V
OC
or V
t
) and
current (Io or I
SC
or I
t
) and the power Po which can be delivered by the barrier.
The sum of the maximum unprotected capacitance (C
i
) for each intrinsically device and the interconnect-
ing wiring must be less than the capacitance (C
a
) which can be safely connected to the barrier.
The sum of the maximum unprotected inductance (L
i
) for each intrinsically device and the interconnecting
wiring must be less than the inductance (L
a
) which can be safely connected to the barrier.
The entity parameters Uo,V
OC
or V
t
and Io,I
SC
or I
t
, and C
a
and L
a
for barriers are provided by the barrier
manufacturer.
NI Field Circuit Parameters
Model 5331C, 5331D, 5333C, 5333D, 5335C, 5335D, 5336D, 5337D and
5343B
Non
Hazardous
Location
Hazardous
(Classified)
Location
Associated Apparatus
or Barrier
SENSOR
1
2
3
4
5
6
This
device
must
not
be
connected
to
any
associated
apparatus
which
uses
or
generates
more
than
250
VRMS
+
‐
Terminal 1 , 2
Vmax : 35 V
Ci: 0 µ F
Li:10 uH
Ambient
temperature
limits
T4:
‐
40
to
+
85
deg.
Celcius
T6:
‐
40
to
+
60
deg.
Celcius
Class I,Division2, Groups, A,B,C,D
Class I, Zone 2, IIC
2/2
20
5331V113-DE
