Electrical connections
20
Installing the transmitters in explosion-hazard areas of zone 2 without a
safety barrier
— Use only supply units of the device category 3.
For safety reasons, we recommend that not more than 8 transmitters be
connected to a 2-wire or 3-wire cable.
— Take care that the maximum permissible capacitance and inductance of
connections to the supply unit are not exceeded, also taking the cable into
account.
The safety-related input parameters of the transmitter are:
C
i
= 5 nF, L
i
= 50 µH.
Installing the transmitter in non-explosion-hazard areas:
For safety reasons, we recommend that not more than 8 transmitters be
connected to a 2-wire or 3-wire cable.
If the transmitters are equipped with relay or pump modules, not more than
4 transmitters should be connected to one cable.
The second cable gland is used for the cable to the next transmitter.
The following tables show permissible combinations of transmitters, supply
voltages and maximum possible cable lengths.
— The capacitance values are typical values for commercially available
shielded cables with PVC insulation. The use of cables with different capac-
ity values will result in other cable lengths.
CAUTION
The category 1 marking has to be cut out from the rating-plate label. Once
the unit has been used after installation in the above manner, it may never
be installed in explosion-hazard areas of zone 0 or zone 1 (device category 1
or 2). Explosion hazard!
CAUTION
The explosion-protection marking has to be removed from the transmitter.
Once the transmitter has been used after installation in this manner, it may
never be installed in explosion-hazard areas. Explosion hazard!
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