Alternate wiring for power supply, Figure 8, Wiring power supply using port i – Vaisala DPT145 User Manual
Page 29
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.
1108-016
Figure 9
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.
1 = VDC+
3 = GND
2
4
1
3
15 ... 28 VDC
+
-