User's Guide ______________________________________________________________________
24 __________________________________________________________________ M210667EN-C
Auto-alignment
A precise alignment mechanism inside the measurement unit is used to
carry out the fine alignment of the LT31 system automatically.
Window Contamination Measurement
Separate transmitters and receivers in combination with a V-shaped
window arrangement are used to measure the real window transparency.
This enables compensation for the window contamination in short term
and detection of possible blocking situations.
Contamination Prevention
Air stream driven by a blower creates an air curtain in front of the LT31
windows to reduce the amount of window contamination caused by
precipitation.
Alignment Quality Control
Based on the auto-calibration and window contamination measurement,
the alignment quality of the transmissometer is permanently observed
and reported in the standard serial data message of LT31.
Double-mast Construction
The double-mast construction prevents the optical parts of the
transmissometer from being influenced by solar radiation or wind.
LED Light Source
A modern, white, high-power LED light source is used for the main
transmitter. The spectral response of the LT31 main receiver is adapted
to the spectral sensitivity of the human eye, which fulfills the related
international requirements.
Self-diagnostics
A comprehensive self-diagnostics leads to detailed status information for
all functional units in the standard serial data message of LT31.
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