Microsensor MPM480 Operation Manual page 11

Note: The tube in the center of the cable can not be blocked or water
inflow, and it must be connected to the atmosphere, to ensure the
protection of the product and the accuracy of the output measurement.
4.2 The transmitter connection shall accord with
above-mentioned definition and in reference to Figure 5,
Figure 6 and Figure 7 for plug or cable connection.
P/I Transmitter
P
P
Input
Cable
Red
Black OV/+OUT
White
+V
0V/OUT
I
Fig.5 2-wire, 4mA～20mADC
Table 2
2-wire
+V
Null
DC current
+
U
Load
+
R
9
3-wire
+V
GND
+OUT
-
-
I
4mA 20mA
～