KROHNE OPTIFLUX 4040 C Ex EN - Manual (Page 7)

INTRODUCTION
1
7
OPTIFLUX 4040 C
www.krohne.com 09/2010 - 7312232100 - AD EX OPTIFLUX 4040 C R01 en
1.4.1 Flow sensor
The flow sensor contains two field coils and two electrodes.
Protection category
1.4.2 Signal converter
The IFC 040 signal converter consists of a cylindrical housing of die-casted aluminum, which has
two separate compartments, divided from each other by an integrated wall with casted
flameproof terminal feed-through. The neck at the bottom of the housing contains a flameproof
cable feed-through. The signal converter housing is on both ends closed by a cylindrical
threaded cover with O-ring sealing. The housing has an ingress protection degree of at least
IP 67 conform to EN 60529.
Electronics compartment Electronics compartment Electronics compartment Electronics compartment
The electronics compartment accomodates the pre-certified IFC 040 electronics unit with
approval number PTB 00 ATEX 2213 U. The compartment is designed with type of protection
flameproof enclosure "d" according to EN 50018. It is closed by a flameproof display cover with
glass window.
Terminal compartment Terminal compartment Terminal compartment Terminal compartment
The terminal compartment has seven terminals for all connections. There are two versions
possible with a different explosion protection according to the European Standards, which is
dependent on the safety-technical maximum voltage Um of the mains power supply system to
which the flowmeter is connected.
Version A: terminal compartment "EEx de [ib]" with U Version A: terminal compartment "EEx de [ib]" with U Version A: terminal compartment "EEx de [ib]" with U Version A: terminal compartment "EEx de [ib]" with U
m m m m
= 60 V
The connections of the output circuits can be configured by the customer in one of the folllowing
types of explosion protection:
• EEx [ib]: intrinsic safety, category "ib"
• EEx e: increased safety
• EEx d: flameproof enclosure (note warning below)
Nominal Nominal Nominal Nominal
diameter
diameter diameter diameter
Type of protection Type of protection Type of protection Type of protection
10...20 Housing: Encapsulation "m" according to EN 50028 and increased safety "e"
according to EN 50019
Electrodes: Intrinsic safety "ib" according to EN 50020
25...150 Housing: Flameproof enclosure "d" according to EN 50018
Electrodes: Intrinsic safety "ib" according to EN 50020
INFORMATION!
The intrinsically safe electrode circuits are only internal circuits and not accessible for the
customer.