Emerson Rosemount CT5100, Reference Manual

Page: 171 / 179

• To permit connection of a suitable temperature sensor, the following intrinsically safe
(IS) parameters have been declared.
• For the connections emerging from the purged enclosure:
Parameter IS
Voltage U
o
12.4 V
Current I
o
17.4 mA
Power P
o
54 mW
Capacitance C
i
0
Inductance L
i
0
• The capacitance and either the inductance or L/R of the load connected to hazardous
area terminals of the apparatus must not exceed the following values for Group IIC:
Capacitance Inductance L/R ratio
1.24 µF 117 mH 597 µH/ohm
The above parameters apply when one of the two conditions below is given:
• The total L
i
of the external circuit (excluding the cable) is < 1 percent of the L
o
value or
• The total C
i
of the external circuit (excluding the cable) is < 1 percent of the C
o
value.
The above parameters are reduced to 50 % when both of the two conditions below are
given:
• The total L
i
of the external circuit (excluding the cable) is ≥ 1 percent of the L
o
value or
• The total C
i
of the external circuit (excluding the cable) is ≥ 1 percent of the C
o
value.
Note
The reduced capacitance of the external circuit (including cable) shall not be greater than
600 nF for Group IIC.
Reference Manual ATEX/IECEX assessment report summary
00809-0100-4512 October 2019
Reference Manual 171