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Endress+Hauser RTA421 - Electrical Connection; Terminal Layout

Endress+Hauser RTA421
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Terminal layout In and outputs
L/L+ L for AC + for DC
Power supply
N/L- N for AC - for DC
81 + 24 V loop power connection
Loop power supply
(option)
11 Signal ground Current, Voltage
Input measurement
signal
15 Meas. signal Voltage 0/2...10 V
16 Meas. signal Current 0/4...20 mA
41 Normally closed contact
Relay output 1
42 Common
43 Normally open contact
51 Normally closed contact
Relay output 2
52 Common
53 Normally open contact
41 42 43
51 52 53
L/L+ N/L-
11 15 16 81
3. Electrical connection
3.1 Terminal layout
Relay 2
Analogue input with loop power supply
Relay 1
Power supply
Contactor
28

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