Dust-Explosion Protection Zone 20; Dust-Explosion Protection Zone 0/20 - ABB HART TTF350 Commissioning Instructions

Electrical connection
4.5.6

Dust-explosion protection Zone 20:

Transmitter design: ATEX II 1D IP 65 T135 °C
Fig. 15
A Sensor
B TTF350 transmitter
C Power supply
The electric circuit of the transmitter must be limited by an upstream fuse per IEC 127 with a
fuse current rating of 32 mA. This is not required if the power supply is in intrinsically safe "ia"
design.
24 - EN
Explosion-protection zone 20
J
A
E
B
D Fuse, 32 mA
E HMI interface for LCD display
TTF350
Safety area
D
C
A00130
CI/TTF350-X1