Chapter 4 _______________________________________________________________ Installation
VAISALA _______________________________________________________________________ 39
Power Supply
Power supply can be connected separately for the measurement
electronics and heating. This allows for the battery backup to be limited
to the measurement power supply.
Measurement electronics require 12 VDC ... 50 VDC. All the heaters can
take AC, DC, or rectified AC. The heater voltage dimensions are
specified below.
Internal Heaters and Heaters for PWL111
The heaters for Background Luminance Sensor PWL111 (optional) are
parallel to the PWD22/52 internal heaters (connector X18 on the
PWC22/52 board). Both heaters are powered by the PWD operating
voltage line and the DC voltage level must be between 12 V and 28 V
(24 V recommended).
If the DC voltage is as low as 12 V, the jumpers inside PWL111 must be
set to 12 V to guarantee sufficient heating power. To access the jumpers,
open the two screws on PWL111 back cover. See jumper settings in
Figure 13.
1206-035
Figure 13 PWL111 Jumper Settings
PWH111 Hood Heaters
A separate heating power of 24 V must be applied when using hood
heaters. They use 30 W each, for a total of 60 W.
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