Microsensor MPM426W Series Operation Manual page 12

b) 3-wire:
P
Inpu
t
4.2 Installation Precautions
There is a vented tube in the dedicated cable of the transmitter, which is
used to connect the back pressure chamber of the gauge pressure
sensor with the atmosphere. During installation and use, the tube must
be connected to the atmosphere, do not be blocked, and liquids must not
flow in from the tube, otherwise the transmitter will be damaged.
5. Unpacking, Shipment Enclosed and Storage
5.1 Attentions before unpacking:
a) Be sure the package is completed, and the package should be put
as the sign "UP".
Figure 7
P/U Transmitter
P
U
Figure 8
+V
GND
+OU
T
11
DC current
+
U
+
U
0/1～5V
-
-