HIMA HIMax X-AI 32 02 - 4.5.4 Ex-Protection with Zener Barriers; 4.5.5 EX-Protection with Power Supply Isolator

X-AI 32 02 4 Start-up
HI 801 055 E Rev. 4.00 Page 47 of 60
4.5.4 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-AI 32 02
AI-
S-
S+
AI+
AI_R+
1
2
3
Barriers
Transmitter Supply
Analog Input
Figure 19: Single-Channel Transmitter Connection with Barrier
4.5.5 EX-Protection with Power Supply Isolator
Analog power supply isolators such as the H 6200A from HIMA can be implemented for
EX-protection. The transmitter supply is not used when an analog power supply isolator is
wired.
Connector Board
AI-
S-
AI+
AI_R+
X-AI 32 02
1
S+
2
3
Analog Repeater Power Supply
Transmitter Supply
Analog Input
Figure 20: Single-Channel Connection of One Analog Power Supply Isolator