ABB TTF300 Inbetriebnahmeanleitung Seite 66

Electrical connections
4.6.1.4 ATEX - Zone 2
Transmitter design: II 3 G Ex nA II T6
Fig. 20
A Sensor
B Transmitter TTF300
In the event of a disturbance, it must be ensured that the supply voltage cannot exceed the
normal voltage by more than 40 %.
nene
4.6.1.5 Dust explosion protection - Zone 20
Transmitter design: ATEX II 1D IP65 T135°C
Fig. 21
A Sensor
B Transmitter TTF300
C Supply isolator
The power supply circuit of the transmitter must be limited by an upstream fuse as per IEC 127
with a fuse current rating of 32 mA. This is not required if the power supply is intrinsically safe
with an [Ex ia] design.
28 - EN
Ex area Zone 2
J
A
Ex area Zone 20
J
A
D
B
C Supply isolator
D Interface for LCD indicator
E
B
D Fuse, 32 mA
E Interface for LCD indicator
TTF300
Safe area
C
A00129
Safe area
D
C
A00130
CI/TTF300-X1