Ex Installations - Siemens MAG 1100 Handbook

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SITRANS F M MAGFLO
3.7

Ex installations

26
3. Project guidance
Signal converters
The signal converter can be one of the following types:
MAG 5000/6000 19" with safety barrier (ia/ib) for separate mounting in safe area
Approval [EEx ia/ib] llB. The safety barrier is to be used with sensors MAG 1100 Ex and MAG 3100
Ex, DN 6 - 300. When this safety barrier is used, the coil circuit is intrinsic safety "ib" and the electrode
circuit is intrinsic safety "ia".
MAG 5000/6000 19" with safety barrier (ia) for separate mounting in safe area
Approval [EEx ia] llC. The safety barrier is to be used with sensors MAG 3100 Ex, DN 350 - 2000.
When the safety barrier is used, the coil circuit is increased safety "e" and the electrode circuit is
intrinsic safety "ia".
Sensors
The sensors can be one of the following type.
MAG 1100 Ex for mounting in Ex areas
Approval EEx ia/ib llB T4...T6. DEMKO no. 97D.121909X. DN 6 - 100.
MAG 3100 Ex for mounting in Ex areas
The sensor carries the approval:
DN 15 - 25 EEx ia/ib llB T4...T6, DEMKO no. 98E.123914X
DN 40 - 300 EEx ia/ib llB T4...T6, DEMKO no. 98E.123915X
DN 350 - 2000 EEx e ia llC T3...T6, SIRA no. Ex 92C3107X.
The electrode circuit in the sensors is manufactured to an intrinsically safe category "ia" and the coil
circuit to an intrinsically safe category "ib", achieved by an integrated and patented protection circuit.
For DN 350 - 2000 the coil circuit is increased safety "e".
Marking
The marking has the following meaning according to European Norm EN 50014.
E: Certified to CENELEC standard.
Ex: Designates explosion proof material and indicates that the apparatus has been approved
in accordance with a certificate issued.
i: "Intrinsic safety" is a protection ensuring that the energy in the electric circuit is too small to ignite
the explosive atmosphere. There are two categories of intrinsic safety: "ia" and "ib".
ia: In intrinsic safety category "ia", the circuit must remain safe, even in the event of two
simultaneous errors occurring that are independent of one another.
ib: In intrinsic safety category "ib" the circuit must remain safe if an error occurs.
d: The enclosure of the of the signal converter is so strong that it can resist an explosion in-
side the enclosure. The enclosure is dimensioned in a way so that an explosion will not effect
the surroundings.
e: "Increased safety" is a constructional safeguard which ensures the apparatus does not
contain normally arcing or sparking devices, or hot surfaces that will cause ignition.
ll: Designates that the apparatus may be used in all areas (Except mining).
B: Indicates the gas group in which the unit may be used.
T4...T6 The temperature class describes the maximum temperature which any exposed surface of
the equipment may reach. The sensor can have temperature class T3, T4, T5 or T6 depending on
the temperature of the media. Please see technical data for the sensor.
T3: Max. surface temperature 200 °C. => (Max. media temperature 180 °C).
T4: Max. surface temperature 135 °C. => (Max. media temperature 120 °C).
T5: Max. surface temperature 100 °C. => (Max. media temperature 90 °C).
T6: Max. surface temperature
DKFD.PS.027.W3.02
85 °C. => (Max. media temperature 75 °C).