ABB TTF300 - Sensor Cable Shielding; Recommended Shielding and Grounding

Electrical connections
CI/TTF300-EN TTF300 EN - 29
4.6.1.6 Dust explosion protection - Zone 0/20
Housing design: ATEX II 1D IP65 T135°C
Transmitter design: ATEX II 1G Ex ia IIC T6
Ex area Zone 0 Ex area Zone 20 Safe area
BC
A00131
J
A
ia
i
a
D
ia
Fig. 22
A Sensor
B Transmitter TTF300
C Supply isolator
D Interface for LCD indicator
If you are using the sensor in Zone 0 and the transmitter in Zone 20, the transmitter must
conform to category 1D and the circuit must be of the "ia" design.
If the transmitter is designed with intrinsic safety, the power supply must feature an intrinsically
safe circuit at all times.
4.6.1.7 Flameproof enclosure - Zone 1
Housing design: ATEX II 2G Ex d IIC T6
Transmitter design: No explosion protection
Ex area Zone 1 Safe area
BC
A00132
J
A
E
D
Fig. 23
A Sensor
B Transmitter in Ex d housing
C Supply isolator
D Fuse, < 32 mA
E Interface for LCD indicator
The only way to achieve the “flameproof enclosure” type of protection is through the correct
installation of a specially certified cable gland with Ex d type of protection that is marked
accordingly.