LM21
The Background Luminance Sensor LM21 is a precision photometer with a verified photopic spectral response.
The LM21 features:
LM21 can only be purchased with LT31 or FD70; or as a spare part to the same product platforms.
To ensure reliable and uninterrupted operation, the LM21 has extensive self-monitoring functions and high-power heating features built into its design.
Optical path clearance monitoring circuitry verifies measurements are not affected by obstructions. Attenuation compensation for window contamination ensures measurement accuracy between window cleanings, and also extends the cleaning interval.
The calibration of LM21 is traceable to international measurement standards for luminous intensity. The calibration coefficients for light intensity have been defined during factory calibration and stored in the LM21 memory.
Quick field calibration can be done using a unique field calibration device (LMA21) that provides a stabilized and diffused white light beam for LM21 calibration. Calibration starts automatically when the calibration unit is connected.
By measuring light attenuation (reduction in light) between the transmitter and receiver, the LT31 is thus independent of the type of visibility…
FD70 is powerful technology that can potentially replace many separate sensors such as your visibility and present weather sensor, rain gauge…
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