Intrinsically Safe Wiring - Siemens SITRANS LG200 Series Instruction Manual

2. Intrinsically Safe Wiring

An intrinsically safe (IS) installation potentially has flammable media present. An
approved IS barrier must be installed in the non-hazardous (safe) area. Observe electrical
data below:
Note:
• Electrical data for SITRANS LG200 Level Transmitter Model 7ML1300-1Axx1-xCA0:
Output/supply circuit (terminals + and -):
in type of protection intrinsic safety EEx ia IIC, only for connection to a certified
intrinsically safe circuit, with the following maximum values:
Ui = 28,4 V; Ii = 94 mA; Pi = 0,67 W; Ci = 2,2 nF; Li = 3 μH. or
• Electrical data in type of protection intrinsic safety EEx ia IIC, only for connection to a
certified intrinsically safe circuit, with the following maximum values:
Ui = 28,4 V; Ii = 94 mA; Pi = 0,67 W; Ci = 3 nF; Li = 3 μH.
WARNING: If flammable media is contained in the vessel, the
transmitter must be installed per Class I, Div. 1 ATEX II 1/2 GD EEx d
[ia] (Explosion Proof) standards of area classification.
1. Install a suitable IS barrier in the non-hazardous (safe) area. Complete the wiring
from the barrier to the SITRANS LG200 transmitter. (refer to local plant or facility
procedures)
2. Unscrew and remove the enclosure lid.
3. Install a cable gland in the conduit entry. Use PTFE tape/sealant to ensure a liquid-
tight connection.
4. Install a conduit fitting and feed the supply wires into the SITRANS LG200 through
the conduit entry.
5. Connect shield to an earth ground at power supply.
6. Connect an earth ground wire to the nearest green ground screw.
7. Connect the positive supply wire to the (+) terminal and the negative supply wire to
the (-) terminal.
8. Replace the enclosure lid.
Page 38 SITRANS LG200 – INSTRUCTION MANUAL 7ML19985KA02