Ceilometer CT25K
CT25K-U059en-2.1 User’s Guide
75
The Window Conditioner consists of a blower motor, heating element and an
NTC temperature sensor inside an enclosure. The air stream from the blower
is directed across the measurement unit window for clearing it from water
drops, condensed humidity, snow and particles.
The blower is automatically switched on when contamination or precipitation
is detected on the window surface or when the atmospheric measurement
indicates that a high risk of precipitation exists. The temperature sensor is
used for determining whether the heater should be turned on or not. All of this
is done under software control via DPS52 and CTP241.
Because the window of the measuring unit is declined and the blower air is
directed from up to down on its surface, water drops and snow are effectively
removed.
CAUTION
There are two different window conditioners for the two
supply voltages 230 V and 115 V. The plug for the correct
connection cable has a marking indicating its nominal
voltage.
WARNING
The heating resistors can be very hot even after the
heating has been switched off! Be cautious when handling
in the vicinity of the heating!
5.3.13 Maintenance Terminal PSION3 (Option)
The Palmtop computer PSION3 is offered as an optional light-weight
maintenance terminal. This is supplied with Series 3 Serial Link, RS232 serial
interface. PSION3 is a pocket-size terminal with high resolution display. It
includes RAM and FLASHRAM for data storage. Two standard Mignon AA
batteries enable operation for 20 hours.
The RS232 interface RS cable has a standard 9 pin connector illustrated in
figure 5-18. The RS cable is connected to Terminal cable CT3840 which is
connected to the CT25K’s maintenance line connector J4.
Figure 5-18 RS Cable
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