GASMAX II 4-20mA WIRING DIAGRAM
GASMAX II ISOLATED 4-20mA WIRING DIAGRAM
U
1
T
B
3
K
2
K
3
K
1
J
1
1
2
4
3
5
A
B
A
S
B
1
2
4
3
5
6
7
9
8
N
O
C
N
C
N
O
C
N
C
N
O
C
N
C
T
B
2
T
B
1
A
B
+
-
A
s
s
y
1
0
-
0
2
3
4
U
1
T
B
3
K
2
K
3
K
1
J
1
1
2
4
3
5
A
B
A
S
B
1
2
4
3
5
6
7
9
8
N
O
C
N
C
N
O
C
N
C
N
O
C
N
C
T
B
2
T
B
1
A
B
+
-
A
s
s
y
1
0
-
0
2
3
4
GASMAX II MODBUS® INTERFACE WIRING DIAGRAM
RS-485
MODBUS
MASTER
CONTROLLER
A
B
10-0234
MODBUS /
ALARM RELAY
BOARD
10-0234
MODBUS /
ALARM RELAY
BOARD
Notes:
1.
Use MODBUS setup
menu to set each
RTU to unique
address (1-247)
2.
Install terminating
resistor (J1-A) only on
last instrument in
MODBUS string.
3.
TB2-1 connects to
TB2-4 and TB2-2
connects to TB2-5
internally.
4.
TB2-3 is ‘no connect’
for cable shield
continuation.
S2
Ribbon to
1
2
4
3
TB2
1) PW R
2) OUT 4-20 “ECHEM”
3) OUT 4-20 “LEL”
4) GND
R
E
F
C
O
M
A
C
T
CATBEAD
S1
C7
C8
C1
C2
I/O Power
TB1
TB2
Detector Power (+)
Detector Common (-)
Channel 2 4-20mA (Bridge or 4-20 IN)
Channel 1 4-20mA (E-chem Input)
10-0233
I/O POWER
SUPPLY
BOARD
T
B
1
U8
4
3
1
2
Isolated 4-20mA output for Bridge or 4-20mA Input (Ch2)
Assy 10-0250
Isolated 4-20mA Output
+
+
-
-
Isolated 4-20mA output for E-chem Input (Ch 1)