USER'S GUIDE____________________________________________________________________
48 __________________________________________________________________ M210482EN-D
Sky Condition Algorithm
General
The Vaisala CL31 Sky Condition algorithm uses a time series of
ceilometer data to calculate the cloud layer height and the amount of
clouds in different layers. The purpose of the algorithm is to construct an
image of the whole sky based on ceilometer measurements from a single
point. The sky condition information is included in data message 2 and
its subclass. The algorithm can report up to five cloud layers below
25 000 feet.
When using emulation message of the CT25K message 6, sky condition
information can be displayed with the DD50 Digital Display. The
emulation message reports up to four different cloud layers below
25 000 feet.
Option code
The sky condition algorithm is included in the 1.50 and latter software
versions. You can activate the algorithm by entering an option code
number to the ceilometer. The option code number is based on the CL31
ceilometer serial number. If the CL31 ceilometer is purchased with the
sky condition activated, this has already been done at the factory. In case
the sky condition option is purchased afterwards, you can find out the
serial number by entering the following command:
CEILO > system
Vaisala Ceilometer CL31
Unit ID: 0
Serial Nro: 421202
SW Version: 1.500
HW Options
Modem: N/A
Humitter: N/A
The ceilometer serial number can also be found in the label on the
measurement unit door. Send the CL31 serial number to Vaisala, and
Vaisala returns the option code, for example, 63273 (see the example in
the next section, Activation).
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