Endress+Hauser FTW33 Betriebsanleitung Seite 34

Electrical connection
Function monitoring (M12 connector)
With two-channel evaluation, functional monitoring of the sensor is also possible in addition
to level monitoring.
When both outputs are connected, the MIN and MAX outputs assume opposite states
(antivalent) when the device is operating fault-free. In the event of an alarm condition or a
line break, both outputs are deenergized.
Connection for function monitoring with antivalence
1
2
3
4
K1 K2
L–
Symbols Description
LED lit
LED not lit
Fault or warning
K1 / K2 external load
34
Sensor covered
Sensor uncovered
0.5A
Fault
L+
Yellow LED
(ye)
1 2
1 4
1 2
1 4
1 2
1 4
Liquipoint FTW33
Red LED (rd)
Endress+Hauser