KROHNE ALTOSONIC V EEx EN - Manual (Page 10)

ALTOSONIC V 6
2.1 Equipotential bonding system
The UFC-V/…-EEx Ultrasonic Flow Converter with cable glands must always be
incorporated into the equipotential bonding system with the UFS 500 F/5STR-EEx 5-beam
Flow Sensor. If the UFC-V/…-EEx is provided with metal rigid conduits, equipotential
bonding is not required but can optional be connected. The bonding conductor must have a
minimum cross-sectional area of 2.5 mm
2 (equivalent to AWG 12) and is provided with a ring
cable lug, which is screwed to the bulge at the base of the flameproof box via a stainless
steel bolt with spring or toothed washer. Make sure that the bolt is tightly fixed.
2.2 Connecting cables
The following cables are shown in the connection diagram:
Cable A: Signal cable for RS485 communication.
Cable parameters must be in accordance with the regulations in the EN 60079-14 "Electrical
installations in hazardous locations" or an equivalent national standard (e.g. DIN VDE 0165).
Cable B: Power supply cable.
Cable parameters must be in accordance with the regulations in the EN 60079-14 "Electrical
installations in hazardous locations" or an equivalent national standard (e.g. DIN VDE 0165).
Rated voltage:
≥ 500 V
Examples: H07..-., H05..-.
Cable C: Quad coaxial cable.
Type MR04 (supplied by KROHNE).
Technical data:
Test
voltage: ≥ 500 V
Diameter of strand (core and screen): ≥ 0.1 mm
Distributed capacitance (core/screen): 67 pF/m
Distributed inductance (core/screen): 0.4 µH/m
Bonding conductor:
Minimum cross-sectional area:
≥ 2.5 mm 2 (equivalent to AWG 12)