Chapter 6 ______________________________________________________________ Maintenance
VAISALA ______________________________________________________________________ 193
CHAPTER 6
MAINTENANCE
This chapter provides information that is needed in basic maintenance of
the product.
Periodic Maintenance
Due to the unique concept of the LT31 transmissometer incorporating
automatic calibration, automatic alignment, and permanent window
contamination measurement, the required periodic maintenance for this
transmissometer system is significantly reduced.
The periodic maintenance interval has also been significantly extended.
The built-in self check processes will generate related status messages, if
any maintenance and/or repair activity is required besides the periodic
maintenance (for example, window cleaning or alignment).
Periodic maintenance includes inspection and cleaning of all
transmissometer system components, optical fine alignment, calibration,
and checking the blower system. Also the optional heated weather
protection hoods are checked in this frame.
NOTE
Periodic maintenance once a year during the springtime is mandatory.
However, periodic maintenance twice a year in the spring and autumn is
recommended.
Depending on the environmental conditions, cleaning windows of the
instrument might be necessary more often, LT31 requests for window
cleaning with a window contamination warning. For details, see Chapter
5, Operation, starting from page 145.