Spirax Sarco LC2250 - Page 22

IM-P402-130 EMM Issue 9
22
+
-
+
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Fig. 9 4 - 20 mA level transmitter
BACK
Self powered
4 - 20 mA
level transmitter
50 51 52 53 54 55
+24 V Vin Iin COM SCN
Level input(s)
E
Connect to a
clean local
earth in the
panel
+
-
+
-
Each instrument must be capable of receiving a 1 - 6 Vdc signal. Only one of the instruments
needs to provide a 24 V nominal supply. In Figure 7, the product is supplying the power for
the capacitance probe.
50 51 52 53 54 55
Connect to
a clean local
earth in the
panel
BACK
Loop powered
4 - 20 mA
level transmitter
+24 V Vin Iin COM SCN
Level input(s)
E
Fig. 8 PA420 4 - 20 mA level transmitter