6 CI/FAM3200-EN Rev. B |
FAM3200
2
Use in potentially explosive
atmospheres
2.1
Ex-marking
ATEX
Type examination certificate
TÜV 03 ATEX 2151
FAM3220 and FAM3225 (device without alarm signalling unit)
II 1/2 G c Tx Ga/Gb
II 2D T115°C Db
FAM3220 and FAM3225 (device with alarm signalling unit)
II 1/2 G c ia IIc T6 Ga/Gb
II 2D T115°C Db
The FAM3250 / FAM3255 models with angular position
transmitters are not approved for use in potentially explosive
atmospheres!
2.2
Temperature data
Maximum permissible ambient temperature
T
ambient
: -20 ... 60 °C (-4 ... 140 °F)
Maximum permissible measuring medium temperature
For the maximum measuring medium temperature, refer to the
tables in chapter "Limit value tables" on page 7.
The maximum permissible measuring medium temperature for
dust explosion protection is derived from the possible surface
temperature of the flowmeter.
The higher value must be used.
2.3
Installation
Observe the following points when installing the devices in
potentially explosive atmospheres:
— The alarm signalling units must only be connected to
certified intrinsically safe circuits.
— When using electrical heat tracing, attention must be paid
to potential functional impairment by electromagnetic
fields. The specifications of EN 60079-14 must be
observed.
— Use with zone 0 in the meter tube. Ensure that the
ambient conditions are suitable for devices in zone 1 (e.g.
through ensuring sufficient ventilation).
2.3.1
Electrical connections
Fig. 1:
Electrical connection of an alarm signalling unit to a
switching amplifier (example)
A
Hazardous area
B
Non-hazardous area
1
FAM3200 flowmeter with alarm signalling unit
2
NAMUR input switching amplifier
3
Switching amplifier
4
Switching amplifier output
5
Switching amplifier power supply
The circuits (between the alarm signalling units and the
switching amplifier) are intrinsically safe. The switching
amplifier itself must be mounted outside the hazardous area.
Change from two to one column
G11959
B
A
U
U
1
+
-
F
3
4
2
5
