Cable; Terminators; Field Instruments - GE FVP110 Maintenance Manual

CENELEC ATEX (KEMA)

Cable

The cable used to interconnect the devices needs to comply with the following
parameters:
❑
Loop resistance R': 15 to 150 Ω/km
❑
Inductance per unit length L': 0.4 to 1 mH/km
❑
Capacitance per unit length C': 80 to 200 nF/km
C' = C' line/line + 0.5 C' line/screen, if both lines are floating
or
C' = C' line/line + C' line/screen, if the screen is connected to one line
length of spur cable: max. 30 m (EEx ia IIC T4) or 120 m (EEx ia IIB T4)
length of trunk cable: max. 1 km (EEx ia IIC T4) or 1.9 km (EEx ia IIB T4)

Terminators

The terminator must be certified by a notified body as FISCO model and at each end of
the trunk cable an approved line terminator with the following parameters is suitable:
R = 90 to 100 Ω
C = 0 to 2.2 μF
The resistor must be infallible according to EN 50020. One of the two allowed
terminators might already be integrated in the associated apparatus (bus supply unit).

Field Instruments

Descriptions and Intrinsically safe ratings of the positioner (FIELD INSTRUMENTS) are
as follows:
Ambient Temperature: –40 to 60 °C
Enclosure: IP65
Electrical parameters:
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❑
❑
❑
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EEx ia IIC T4
Maximum Voltage (Ui) = 17.5 V
Maximum Current (Ii) = 360 mA
Maximum Power (Pi) = 2.52 W
Internal Capacitance (Ci) = 1.76 nF
Internal Inductance (Li) = 0 μH
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Safety