Dust-Explosion Protection Zone 20; Dust-Explosion Protection Zone 0/20 - ABB TTF300 Inbetriebnahmeanleitung

4.4.6

Dust-explosion protection Zone 20:

Transmitter design: ATEX II 1D IP65 T135°C
Fig. 16
A Sensor
B TTF300 transmitter
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.
CI/TTF300-X1
Explosion-protection zone 20
J
A B
C Repeater power supply
D Fuse, 32 mA
TTF300
Electrical connection
Safety area
D
C
A00119
EN - 21