Campbell CS120A, Руководство пользователя

Страница: 46 / 62

CS120A Visibility Sensor
36
This part of the test will take approximately two minutes. Every ten seconds a dot
should appear indicating that the test is progressing as normal.
Once the second stage of the test has been completed the new calibration constants
will be saved automatically. All calibration constants including both the user and
the factory setting can be viewed from menu item 4 from the main menu once the
test is completed.
16. Performing an operating system update
Operating system updates for the CS120A visibility sensor are performed using
Campbell Scientifics’ Device Configuration Utility (DevConfig) software. Please
refer to the help built into the DevConfig software for full instructions on how to
update the CS120A operating system. Note that CS120A operating systems
cannot be installed on CS120 sensors.
17. Cleaning
The CS120A visibility sensor is a robust instrument that will provide years of
uninterrupted weather monitoring. Calibration of the instrument is carried out at
the factory and can be redone easily on site with the optional CS120A calibrator
or carried out by Campbell Scientific if required. Only general cleaning of the
lenses is required to keep the sensor working efficiently.
Cleaning of the CS120A will be required from time to time to ensure that the
lenses are free from contaminants. The frequency of required cleaning depends on
the exposure of the instrument to such contaminants. This will vary depending on
the site location. The CS120A is capable of self diagnosing dirty lenses and will
indicate in its output when the lenses are contaminated to such a degree that its
visibility measurements may be affected.
A lower level of contamination than is detected by the dirty window
alarms, can affect the visibility measurements. The sensor will
attempt to make a correction for contamination although the
accuracy of that correction depends on the `type of dirt’.
In any case we suggest 6 monthly intervals for locations not prone to
contaminants and monthly intervals for those prone to contamination (roadside or
airport use). In some cases more frequent cleaning may be required where there
are high levels of contaminants and high dependency on the instrument output.
If the lenses require cleaning, it is very important that only a
proper lens cloth or lens tissue be used. The use of
inappropriate materials to clean the lenses can permanently
damage or reduce the effectiveness of the lenses leading to
errors in measurement of precipitation and visibility.
It is advisable to use an air duster to blow any loose dust and dirt from the lenses
as a first step. Using a lint free lens cloth or lens tissue impregnated with a small
NOTE
CAUTION
Calibration is now complete.
Saving user settings
Press any key to exit.