Chapter 4 _______________________________________________________________ Installation
VAISALA _______________________________________________________________________ 29
Alternate Wiring for Power Supply
If necessary, you can provide supply voltage using Port I, and only
wire RS-485 for Port II.
Do not supply power from both ports
.
1 = VDC+
3 = GND
2
4
1
3
15 ... 28 VDC
+
-
1108-016
Figure 8
Wiring Power Supply Using Port I
Stabilization of Dewpoint Reading After
Installation
After installation, the transmitter will have a small amount of
moisture inside it. In still, dry gas it takes a long time until vapor
pressure inside the measurement cell reaches equilibrium with the
main gas tank. It is not unusual for the stabilization of the dewpoint
reading to take several days after installation.
