Emerson Rosemount 3490 Series, Справочное руководство

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c. The Intrinsically Safe outputs of the control unit may be connected to
certified equipment used in a hazardous area requiring Equipment Protection
Level Ga or Da (category 1) equipment, with flammable gas and vapor
groups IIC, IIB and IIA, and flammable dust groups IIIC, IIIB, and IIIA. No
additional I.S. barrier is required.
d. If the circuit connected to terminals 1 and 2 does not satisfy IEC60079-11
(EN60079-11) clause 6.3.13 (Isolation of circuits from earth or frame), then
equipotential earthing/grounding to the control unit intrinsically safe earth/
ground shall be provided.
An example of equipotential earthing/grounding is a cable with a cross-
sectional area greater than 4 mm
2
and a resistance of less than 1 Ohm.
4. Technical data:
a. Coding:
ATEX II (1) GD
[Ex ia] IIC (–40 °C ≤ Ta ≤ 55 °C)
[Ex ia Da] IIIC (–40 °C ≤ Ta ≤ 55 °C)
IECEx [Ex ia] IIC (–40 °C ≤ Ta ≤ 55 °C)
[Ex ia Da] IIIC (–40 °C ≤ Ta ≤ 55 °C)
b. Safety parameters:
Terminals T1 (24 V) with respect to T2
(I
in
) and T1 (24 V) with respect to T3
(Earth)
Terminals T2 (I
in
) with respect to T3
(Earth)
(1)
Ui = 0, Uo = 27.3 V, lo = 96.9 mA, Po =
0.66 W, Li = 0.22 mH, Ci = 0.6 nF Ui = 30 V, li = 120 mA, Li = 0.1 mH, Ci =
0.6 nF, Uo = 6.51 V (capacitive charging
only), Io = 0, Po = 0
(1) Terminal T2 (I
in
) with respect to terminal T3 (Earth) must be treated as a 6.51 V
source. The 6.51V is considered as being theoretical maximum to which a
capacitive load across these terminals could become charged through leakage
via internal series blocking diodes. This voltage does not contribute to the short
circuit sparking risk of any external source connected to these terminals.
c. The capacitance and inductance of the load connected must not exceed the
following values:
Group Capacitance Inductance (mH) or L/R Ratio (μH/
Ohm)
IIC 0.082 μF
(1)
1.2 mH 42 μH/Ohm
IIB 0.65 μF 10.9 mH 172 μH/Ohm
IIA 2.15 μF 21.9 mH 346 μH/Ohm
(1) 0.082 μF of which total Ci of the hazardous area apparatus connected must not
exceed 0.020 μF.
Product certifications Reference Manual
January 2021 00809-0100-4841
162 Emerson.com/Rosemount