Vaisala WXT520 - Manual (Page 47)

Chapter 5 _______________________________________________ Wiring and Power Management
VAISALA_______________________________________________________________________ 45
power with 12 VDC and 24 VDC supplies. Input resistance (R
in
) is
radically increased with voltages above 16 V (see the following graph).
The recommended ranges for AC or full-wave rectified AC are:
- 68 V
p-p
± 20 % (max 0.6 A), for AC;
- 34 V
p
± 20 % (max 0.6 A), for f/w rectified AC.
0805-22 Figure 21 Heating Current and Power vs Vh
WARNING Make sure that you connect only de-energized wires.
CAUTION To avoid exceeding the maximum ratings in any condition, the
voltages must be checked with no load at the power supply output.