Wiring In Hazardous Areas - Omega FC-21 User Manual

FC-21 Flow Computer
Flow Input
Temperature Input
(4-20mA Transmitter)
Temperature Input
(RTD)

4.3 Wiring In Hazardous Areas:

Examples using MLT787S+ Barrier (MTL4755ac for RTD)
Flow Input
Hazardous Area
4-20mA Flow 4-20
Transmitter
Q/∆P
Temperature Input (4-20mA Transmitter)
Hazardous Area
–
4-20mA Temp.
4-20
Transmitter
T
+
Temperature Input (RTD)
Hazardous Area
3-Wire RTD
Safe Area
+
28V
Diode
–
Safe Area
28V
Diode
Safe Area
12
1
24V Out
2
3 4-20mA In
4
Common
1 24V Out
4
Common
8
4-20mA In
4 Common
5
6 RTD Excite (+)
7 RTD Sense (+)
8 RTD Sense (–)