KROHNE UFM 3030 EEx EN User Manual

Page 20

UFM 3030

Operation of the flow converter

4.1

Operation of the flow converter

The UFC 030…-EEx electronics unit of the UFM 3030 K/…-EEx compact flowmeter and the UFC
030 F/…-EEx flow converter in remote design is equipped with a display unit that contains magnetic
sensors (Hall-sensors). The sensors enable setting of the UFC 030…-EEx electronics to be set or
reset with the help of the with the apparatus delivered bar magnet without opening the flameproof
electronics compartment in the hazardous area. Consult the standard Installation and Operating
Instructions (i.e. Part B) for the program functions of the software of the UFC 030…-EEx electronics
unit.

4.2 Connecting

cables

The below described cables are shown in the connection diagram of these
additional Installation and Operating Instructions.

Cable A

Signal cable for current output and binary in-/outputs (pulse and status output).
This cable type must be in accordance with clause 9 of the EN 60079-14
"Electrical installations in hazardous locations" or an equivalent national standard
(e.g. DIN VDE 0165 Part 1).

Cable B

Mains power supply cable. This cable type must also be in accordance with clause
9 of 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..-. to HD 21.S2 or HD22.S2

Cable C

MR06 coaxial cable (only for remote default version), to be supplied by KROHNE
Altometer.
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

Cable D

MR04 coaxial cable (only for remote optional version), also supplied by KROHNE
Altometer. This cable has the same technical data as cable C above, except that it
contains four coaxial cables in stead of six for the MR06 cable.

Equipotential
bonding
conductor

Minimum cross-sectional area;

•

unprotected: 4 mm

(11 AWG)

•

protected by metal conduit: 2.5 mm

(14 AWG).