Vaisala WMT52 - Manual (Page 43)

Chapter 5 _______________________________________________ Wiring and Power Management
VAISALA_______________________________________________________________________ 41
Typical DC voltage ranges are as follows:
- 12 VDC ± 20 % (max 1.1 A);
- 24 VDC ± 20 % (max 0.6 A).
Maximum heating power is achieved at voltages 15.5 V and 32 V.
Nominally at 15.7 V heating voltage level the WMT52 automatically
changes the heating element combination in order to consume equal
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 Vp-p ± 20 % (max 0.6 A), for AC;
- 34 Vp ± 20 % (max 0.6 A), for f/w rectified AC.
0805-22 Figure 20 Heating Current and Power vs Vh
CAUTION To avoid exceeding the maximum ratings in any condition, the
voltages must be checked with no load at the power supply output.
WARNING Make sure that you connect only de-energized wires.