Table 9-1: Input intrinsically safe parameters
Intrinsically safe
parameters
Output signal
4–20mA/HART
pulse
Foundation
fieldbus
FISCO
Ui,
(1)
V 30 30 17.5
Ii,
(1)
mA 185 300 380
Pi,
(1)
W 1 1.3 5.32
Li, uH 970 20 10
Ci, nF 0 0 0
(1) Applicable values Ui, Ii are limited by the maximum input power Pi. It is
not allowed to apply max values of Ui, Ii at the same time.
Special conditions for safe use (X):
1. Power supply of flowmeters with Ex marking 0Ex ia IIC T4 Ga X
must be implemented through intrinsically safe barriers having
certificate of conformity for appropriate subgroups of electrical
equipment.
2. Inductance and capacitance of intrinsically safe circuits of
flowmeters with Ex marking 0Ex ia IIC T4 Ga X, with given
parameters connecting cables must not exceed maximum
values shown on the intrinsically safe barrier from the side of
explosive zone.
3. When the equipment is installed, particular precautions must
be taken to ensure, taking into account the effect of process
fluid temperature, that the ambient temperature of the
electrical housing of the equipment meets the marked
protection type temperature range.
4. When fitted with the 90V transient suppressors, the equipment
is not capable of passing the 500V insulation test. This must be
taken into account upon installation.
5. The enclosure may be made from aluminium alloy with a
protective polyurethane paint finish; however, care should be
taken to protect it from impact or abrasion when located in
Zone 0.
N8
Type of protection «n» and "intrinsically safe" level «ic»
Ex marking: 2Ex nA ic IIC T5 Gc X (-50°C ≤ Ta ≤ 70°C)
Electrical parameters:
• The maximum DC voltage (with output 4-20 mA HART/pulse) 42V;
Quick Start Guide October 2018
48 Rosemount
™
8800D Series Vortex Flowmeter
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