ABB TTF350 Operating Instructions Manual page 30

Electrical connection
5.5.2.6 Dust-explosion protection Zone 0/20
Housing design: ATEX II 1D IP65 T135°C
Transmitter design: ATEX II 1G EEx ia IIC T6
Explosion-protection zone
Fig. 18
A Sensor
B TTF350 transmitter
When using the sensor in zone 0, the transmitter must be in EEx ia (category 1G) design.
If the transmitter is designed with intrinsic safety, the power supply must provide an intrinsically
safe circuit.
30
0
i
a
J
A
Explosion-protection zone 20
D
ia
B
C Power supply
D HMI interface for LCD display
TTF350
Safety area
ia
C
A00131
OI/TTF350-EN