FISCHER DE49 A Series, Operating Manual

Page: 12 / 36

3 | Assembly FISCHER Mess- und Regeltechnik GmbH
12/36 BA_EN_DE49_A
2-conductor circuit
Input signal
Non-ATEX
supply
+Sig
-Sig
+U
b
-U
b
Output signal
Pressure transmitter
DE49
+
Intrinsically safe
barrier
+
Δp
ATEX zone
ia
Fig. 6: 2L Circuitry
Supply and signal power circuit limit values
(Ignition protection type intrinsic safety Ex ia IIC)
U
i
≤ 30 V
I
i
≤ 100 mA
P
i
≤ 750 mW
inner effective capacity C
i
2.5 nF
effective inner inductivity L
i
negligible
NOTICE! In contrast to the EMV-GND, the power connections have an in-
ner capacity of max. 5 nF.
Pin assignment
Fig. 7: M12 connector 5-pin
Pin Signal name Cable colour
1 Supply (+) / output (+) +U
b
+Sig brown
2 unused n.c. white
3 Supply (-) / output (-) -U
b
-Sig blau
4 unused n.c. schwarz
5 Functional earth FE green/yellow
A Coding A
Table 1: Supply and output signal