SwirlMaster FSS430, FSS450 VortexMaster FSV430, FSV450 | CI/FSS/FSV430/450-EN Rev. D 23
5.4 Connection examples
Fig. 21: Connection example
1 Internal earthing terminal 2 Power supply, current / HART output 3 Load resistance 4 Power supply
5 Handheld terminal 6 External display 7 Terminal for external display 8 External earthing terminal 9 Digital output
j Analog input
For connecting the signal voltage / supply voltage, twisted
cables with a conductor cross-section of 18 … 22 AWG /
0.8 … 0.35 mm
2
and a maximum length of 1500 m (4921 ft)
must be used. For longer leads a greater cable cross section
is required.
For shielded cables the cable shielding must only be placed on
one side (not on both sides).
For the earthing on the transmitter, the inner terminal with the
corresponding marking can also be used.
The output signal (4 20 mA) and the power supply are
conducted via the same conductor pair.
The transmitter works with a supply voltage between
12 ... 42 V DC. For devices with the type of protection "Ex ia,
intrinsic safety" (FM, CSA, and SAA approval), the supply
voltage must not exceed 30 V DC. In some countries the
maximum supply voltage is limited to lower values. The
permissible supply voltage is specified on the name plate on
the top of the transmitter.
The possible lead length depends on the total capacity and
the total resistance and can be estimated based on the
following formula.
L =
65 x 106
–
Ci + 10000
R x C C
L Lead length is meters
R Total resistance in Ω
C Lead capacity
C
i
Maximum internal capacity in pF of the HART field devices in the
circuit
Avoid installing the cable together with other power leads (with
inductive load, etc.), as well as the vicinity to large electrical
installations.
The HART handheld terminal can be connected to any
connection point in the circuit if a resistance of at least 250 Ω
is present in the circuit. If there is resistance of less than 250
Ω, an additional resistor must be provided to enable
communication. The handheld terminal is connected between
the resistor and transmitter, not between the resistor and the
power supply.
G11768
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