KROHNE IFC 090F Converter EEx-ATEX EN - Manual (Page 3)

ALTOFLUX IFC 090 F-EEx and ALTOFLUX IFC 090 F / i-EEx 3
1 System components
1.1 General information
The ALTOFLUX IFC 090 F/…-EEx signal converter complies with the European Directive 94/9/EC
(ATEX 100a) and has been approved for hazardous classified locations of Zone 1 and 2 by the
KEMA conform the European Standards of the EN 500xx series. The IFC 090 F/…-EEx has the
following EC-type examination Certificate number:
KEMA 01 ATEX 2234
The signal converter is available in two types, namely:
IFC 090 F-EEx regular explosion protected version;
IFC 090 F/i-EEx, MODIS version. This type has intrinsically safe signal output circuits, which are
pro-vided by two installed MODIS modules (see Sect. 1.5 for details).
The regular IFC 090 F-EEx signal converter is designed for ambient temperatures in the range of
–40
°C up to +60°C, the so-called MODIS version type IFC 090 F/i-EEx is rated for ambient
temperatures from -20°C up to +60°C. Both types of signal converters are in remote design, which
means that they are installed on a certain distance of the measuring unit, the IFS x000 F-EEx
series of primary heads. The primary heads are approved according to the European Directive
94/9/EC (ATEX 100a) as well. Due to the installation on a distance from the primary head, the
signal converter is independent of the process liquid temperature and therefore rated for
temperature class T6 and a T85ºC for dusts.
The IFC 090 F / … EEx signal converter is marked with the following code below:
Regular version II 2GD EEx de [ib] IIC T6
MODIS version
II 2GD EEx de [ia] [ib] IIC T6
Also see the EC-type Examination Certificate in Sect. 8 of these instructions.
1.2
IFS x000 F-EEx primary head
The IFS x000 F-EEx series primary head is the measuring unit of the IFC 090 F/…-EEx signal
converter and contains two field coils and two electrodes in type of protection intrinsic safety
category "ib" according to EN 50020. The type of protection of the field coils depends on the meter
type and size, see the additional installation and operating instructions of the primary head
concerned.
The electrode circuits are wired by separate shielded cables and marked by the sheath color
(white and purple). The intrinsical safe "ib" electrode circuits inside the IFS x000 F-EEx primary
head have the following maximum values (entity parameters):
Maximum input voltage
U
max
= 20 V
Maximum output current I
max
= 170 mA
Maximum internal capacitance C
i
= 0
Maximum internal inductance L
i
= 0
The two field coils inside the primary head are connected in series and provided with the type of
protection increased safety “e” conform to EN 50019 and additionally flameproof enclosure “d” in
accordance with EN 50018 or encapsulation “m” according to EN 50028. The coils have a
maximum resistance below 90
Ω per coil with a wire diameter of at least 0.25 mm and insulation
class H (T
max
≥ 180°C) according to IEC 85. The field coils are supplied with a square-wave signal
with a peak voltage of 60 V maximum and a nominal current of 125 mA. The coil circuit is
protected by two series fuses in the IFC 090 …-EEx electronics unit. The fuses are rated for a
maximum voltage of 250 Vac @ 50-60 Hz, have a breaking capacity of at least 35 A and switching
characteristics fast (F) to time-lag (T).