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• Metal cable glands should be used where the cables enter the meter amplifier box. Unused cable
ports should be fitted with metal blanking plugs.
3.3 Processor wiring for remote-mount 2700
FOUNDATION fieldbus
™
option
3.3.1 RS-485 entity parameters for the remote-mount 2700
FOUNDATION fieldbus
™
option
DANGER!
Hazardous voltage can cause severe injury or death. To reduce the risk of hazardous voltage,
shut off power before wiring the meter.
DANGER!
Improper wiring in a hazardous environment can cause an explosion. Install the meter only in
an area that complies with the hazardous classification tag on the meter.
RS-485 output and cable entity parametersTable 3-2:
Cable parameters for intrinsically safe circuit (linear)
Voltage (U
i
) 17.22 VDC
Current (I
i
) 484 mA
Maximum capacitance (C
i
) 1 nF
Maximum inductance (L
i
) Negligible
Cable parameters for Ex ib IIB, Ex ib IIC
Voltage (U
o
) 9.51 VDC
Current (instantaneous) (I
o
) 480 mA
Current (steady state) (I) 106 mA
Power (P
o
) 786 mW
Internal resistance (R
i
) 19.8 Ω
Cable parameters for Group IIC
Maximum external capacitance (C
o
) 85 nF
Maximum external inductance (L
o
) 25 µH
Maximum external inductance/resistance ratio
(L
o
/R
o
)
31.1 µH/Ω
Cable parameters for Group IIB
Maximum external capacitance (C
o
) 660 nF
Wiring
34 Micro Motion Fork Viscosity Meter