KROHNE ALTOFLUX IFM4042K EEx EN - Manual (Page 11)

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5. EQUIPOTENTIAL BONDING SYSTEM
The IFM 4042 K-EEx electromagnetic compact flowmeter must be incorporated into the
equipotential bonding system. Therefore the bonding conductor with a maximum cross-
sectional area of 4 mm
2 (AWG 10) must be connected to the external U-clamp terminal M5
that is press-fitted in the connecting flange at the bottom of the neck of the flameproof signal
converter housing.
The U-clamp terminal is made of nickel-plated brass to prevent it for corrosion. When the
IFM 4042 K-EEx is incorporated in the equipotential bonding system, make sure that the core
of the bonding wire is properly mounted under the U-clamp and that the screw is tightly fixed.
6. TECHNICAL DATA
See also the standard installation and operating instructions of the Altoflux 2W magnetic-
inductive compact flowmeter type IFM 4042 K-EEx.
Ambient temperature: -40°C…+60°C.
Process liquid temperature: See EC-type Examination Certificate of the IFM 4042 K-EEx
with No. KEMA 01 ATEX 2200 X or the two tables below.
Maximum process liquid temperature Temperature
class
(for gases)
Max. surface
temperature
(for dusts)
T
a
≤
40°C T
a
≤
50°C T
a
≤
60°C
T6 T85°C 75°C 70°C 70°C
T5 T100°C 95°C 90°C 75°C
T4 T135°C 130°C 115°C 75°C
T3 T180°C 150°C 115°C 75°C
Table 5: Temperature classification DN10…20 and DN200 and larger.
Maximum process liquid temperature Temperature
class
(for gases)
Max. surface
temperature
(for dusts)
T
a
≤
40°C T
a
≤
50°C T
a
≤
60°C
T6 T85°C 70°C 70°C 70°C
T5 T100°C 85°C 85°C 85°C
T4 T135°C 120°C 120°C 115°C
T3 T180°C 180°C 180°C 115°C
Use heat-resistant cables above - - 50°C
Table 6: Temperature classification DN25…150.
NOTES:
•
T
a
represents the maximum ambient temperature.
•
The maximum process liquid temperatures listed in the above tables apply for measuring
tubes that have a PFA liner and are absolute safety-technical limits. Due to function-
technical reasons (e.g. different lining material) lower process liquid temperatures can be
in effect.
7. MAINTENANCE
The IFM 4042 K-EEx electromagnetic compact flowmeters are maintenance free with regard
to the flowmetering properties. Within the scope of the periodical inspections, which are
required for electrical apparatus that are installed and used in hazardous classified locations,
it is recommended to check the flameproof enclosure(s).