Endress+Hauser Gammapilot FMG50 - Wiring Examples; Point Level Measurement; Cascade Mode with 2 FMG50 Units; Rma42

Electrical connection Gammapilot FMG50
36 Endress+Hauser
5.11 Wiring examples
5.11.1 Point level measurement
The output signal is linear between free and covered adjustment (e.g. 4 to 20 mA) and can
be evaluated in the control system. If a relay output is needed, the following Endress
+Hauser process transmitters can be used:
• RTA421: for non-Ex applications, without WHG (German Water Resources Act), without
SIL
• RMA42: for Ex-applications, with SIL certificate, with WHG
4
5
C
3
2
2
2
16
B
A
11
X8
D
.
.
-
1
+
-
1
+
-
1
+
-
X4
A0018092
A Wiring with RTA421 switching unit
B Wiring with control system (pay attention to the explosion protection regulations)
C Wiring with RMA42 switching unit
D When installing in hazardous areas, please observe the corresponding Safety Instructions
1 Gammapilot FMG50
2 4 to 20 mA
3 RTA421
4 PLC (pay attention to the explosion protection regulations)
5 RMA42
5.11.2 Cascade mode with 2 FMG50 units
Level measurement: FMG50 with RMA42 process transmitter
Conditions requiring several FMG50 units:
• Large measuring ranges
• Special tank geometry
Two FMG50 units can be interconnected and powered via one RMA42 process transmitter.
The individual output currents are added; this gives the total output current.
The internal HART resistor of the RMA42 is used for HART communication. HART
communication with the FMG50 is possible via the front terminals of the RMA42.
Avoid overlap between the individual measuring ranges as this can result in an
incorrect measured value. The devices can overlap provided this does not affect the
measuring ranges.