Endress+Hauser HART Levelflex FMP53 Operating Instructions Manual page 12

Electrical connection
Terminal assignment, 2-wire: 4 to 20 mA HART, switch output
A
2
1
 4 Terminal assignment, 2-wire: 4 to 20 mA HART, switch output
A Without integrated overvoltage protection
B With integrated overvoltage protection
1 Connection 4 to 20 mA, HART passive: terminals 1 and 2, without integrated overvoltage protection
2 Connection, switch output (open collector): terminals 3 and 4, without integrated overvoltage
protection
3 Connection, switch output (open collector): terminals 3 and 4, with integrated overvoltage protection
4 Connection 4 to 20 mA, HART passive: terminals 1 and 2, with integrated overvoltage protection
5 Terminal for cable shield
Block diagram, 2-wire: 4 to 20 mA HART, switch output
 5 Block diagram, 2-wire: 4 to 20 mA HART, switch output
1 Active barrier for power supply (e.g. RN221N); observe terminal voltage
2 Resistor for HART communication (≥ 250 Ω); observe maximum load
3 Connection for Commubox FXA195 or FieldXpert SFX350/SFX370 (via VIATOR Bluetooth modem)
4 Analog display unit; observe maximum load
5 Cable screen; observe cable specification
6 Measuring device
7 Switch output (open collector)
12
5
3
2
1
+
-
Levelflex FMP53 HART
B
4
5
6
+
1
I
-
2
+
Y
3
-
4
7
3
4
5
A0036500
A0036501
Endress+Hauser