Seametrics FT400-Series User Manual
Page 8
CONNECTION DIAGRAMS
FT420 Display with 4-20 mA Output
Caution: Important! Do not connect power to the power supply until all connections have
been made and confirmed correct, and the cover has been put back into place.
+
_
S
+
_
+
_
+
_
+
+
_
_
+
_
+
_
+
_
Reverse Output
(Option-15 only)
Power
Forward Output
EX-SERIES
4-20 mA Device
(e.g. pump, PLC)
24 Vdc
Power
Sensor
Input
Power
4-20mA
Pulse
Scaled
Pulse
Pass-Thru
FT420
24 Vdc
Power
Caution: It is essential for safety and proper operation to use a ground connection for the
115 Vac power. Do not use this power supply without proper grounding.
When running the FT420 with a magmeter (which requires power), the FT420 must be connected to two power supplies, one for the
magmeter and one for the 4-20 mA loop. You may either use a dual power supply (available from Seametrics as the PC42), or two single
power supplies (one of which may be the 4-20 mA loop itself). See diagrams below.
FT420/4-20 mA Output with Two Separate Power Supplies
FT420/4-20 mA Output with PC42 Dual Power Supplies
Page 6
115Vac, 50/60Hz
Earth
Ground
350 mA Max
100 mA Max
Pre-wired power cord
Replace if required
4-20 mA Device
Analog Output
PWR
SW
+
+
FT420
Display Module
Power Input
Sensor Input
(N/C)
PC42 Dual Power Supply
Pulse Output
Power Input
(N/C)
(N/C)
EX800/EX100 Series
Magmeter
24V
12V
AC AC
G
AC
AC
S
+
+
-
-
+
-
+
-
-
-
-
+
Red
Black
Green
White
Red
Black
Red
Red
Black
Re
d
Black
Red
Green
Whit
e