User Manual

SP3850 Flow Computer
14
4.4 Wiring In Hazardous Areas:
Examples using MLT787S+ Barrier (MTL4755ac for RTD)
Hazardous Area Safe Area
Temperature Input (4-20mA Transmitter)
4-20
T
–
+
1 2
4 3
28V
Diode
1
4
7
24V Out
4-20mA Temp.
Transmitter
4-20mA In
Common
Temperature Input
(4-20mA Transmitter)
Hazardous Area Safe Area
Temperature Input (RTD)
4
5
6
7
8
1 2 3 4 5 6
7 8 9 10 11 12 13 14 15 16 17
Common
RTD Excite (+)
RTD Sense (+)
RTD Sense (–)
3-Wire RTD
Temperature Input
(RTD)
Hazardous Area Safe Area
Pressure Input (4-20mA Transmitter)
4-20
P
–
+
1 2
4 3
28V
Diode
1
4
8
24V Out
4-20mA Press.
Transmitter
4-20mA In
Common
Pressure Input
(4-20mA Transmitter)