User's Guide ______________________________________________________________________
278 _________________________________________________________________ M210667EN-C
Property Description / Value
Special features: - Auto-calibration
- Automated fine alignment
- Alignment quality control
- Window contamination measurement
and compensation
- Window blower system
- Double mast structure
- Sophisticated self-diagnostics
Present Weather Reporting Option:
Identifies
Reports
- 7 different types of precipitation (rain, freezing
rain, drizzle, freezing drizzle, mixed rain/snow,
snow, ice pellets)
- 49 different codes from WMO 4680 code table
Optical Specifications
Table 39 LT31 Transmitter Optical Specifications
Property Description / Value
Light source - White Light Emitting Diode
- Certified class 1 product according to
EN 60 825-1
Modulation frequency 1 kHz
Lens diameter 40 mm
Automatic fine alignment span 3.5°
Optical monitoring Light source stability control
Window contamination measurement and
compensation circuitry
Table 40 LT31 Receiver Optical Specifications
Property Description / Value
Spectral response Adapted to human eye spectral sensitivity
Lens diameter 40 mm
Automatic fine alignment span 3.5°
Optical monitoring Photodiode DC level measurement
Window contamination measurement and
compensation
Active self-test circuitry
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