HIMA HIMax X-DI 64 01 - Ex-Protection with Zener Barriers; Ex-Protection with Isolation Amplifier

X-DI 64 01 4 Start-up
HI 801 093 E Rev. 4.00 Page 41 of 52
4.4.3 Ex-Protection with Zener Barriers
Zener barriers can be used for EX-protection, e.g., barriers of MTL, Type 7787+ or
Pepperl+Fuchs, Type Z787.
Connector Board
X-DI 64 01
DI+
S+
1
2
3
Barriers
Transmitter Supply
Digital Input
Figure 18: Single-Channel Proximity Switch Connection with Barriers
4.4.4 Ex-Protection with Isolation Amplifier
Isolation amplifiers must be used for ex-protection such as the isolation amplifiers H 4011
and H 4012 from HIMA. The proximity switch supply is not used when wiring a power
supply isolator.
Connector Board
DI+
DI-
X-DI 64 01
L-
L+
1
2
Safety Proximity Switch (NAMUR) Digital Input
Figure 19: Single-Channel Wiring of a Isolation Amplifier