Xylem Expert 3400 - Manual (Page 7)

7
Manual
Manual Expert 1400/3400 GB 0704
MJK Automation A/S
Byageren 7
DK-2850 Naerum
Denmark
Tel.: +45 45 56 06 56
Fax: +45 45 56 06 46
[email protected]
www.mjk.com
Explosion hazardous zone
The insulation between the intrinsic safe circuit and the enclosure withstands 500 VAC.
Isolator
The KFD0-CS-Ex1.50P isolator (MJK part no.: 202993) which supplies the pressure transmitter through a galvanic sepa-
rator so neither current nor voltage exceeds the specified limits.
Zener barrier
The Z788 Zener Barrier (MJK part no. 202995) has a safety fuse which will blow if the current exceeds the limit.
The voltage protection in the Zener barrier contains a number of zener diodes, which are connected from each signal
cable to ground.
Hazardous area Safe area
Isolator
202993
1 +
2 -
POWER SUPPLY 515
200100
24VDC
-
7
24VDC
+
6
230VAC
N
3
230VAC
L
1
Pasiv
mA input
AI
+
AI
-
230 VAC
KFD0-CS-Ex1.50P isolator
+
Wire 1
Red
-
Wire 2
Brown
shield
Wire 3
black
11 (+)
12 (-)
Safe area Hazardous area
POWER SUPPLY 515
200100
24VDC
-
7
24VDC
+
6
230VAC
N
3
230VAC
L
1
Pasiv
mA input
AI
-
AI
+
230 VAC
+
Wire 1
Red
-
Wire 2
Brown
shield
Wire 3
black
1
3
2
8
Zener barriere
202995
4
7
Z788 Zener Barrier