User manual VAISALA CL51 DATASHEET

[. . . ] www. vaisala. com CL51 Ceilometer for High-Range Cloud Height Detection The Vaisala Ceilometer CL51 is designed to measure high-range cirrus cloud heights without surpassing the low and middle layer clouds, or vertical visibility in harsh conditions. The CL51 employs a pulsed diode laser LIDAR (Light Detection And Ranging) technology, where short, powerful laser pulses are sent out in a vertical or near-vertical direction. [. . . ] The automatic window blower with heater improves performance by keeping the window clean and dry. In cold conditions heating prevents frost generation on the window. Any malfunction is automatically reported in the data and status messages. Measurement from the ground level The enhanced single lens technology applied in the CL51 ensures excellent performance starting at a height of virtually zero. The signal is strong and stable over the whole measurement range. The CL51 is able to detect three cloud layers simultaneously. If the cloud base is obscured due to precipitation or ground-based fog, the CL51 reports Vertical Visibility. The CL51 is able to provide the backscatter profile over the full measurement range. This information provides a possibility for an advanced boundary layer and atmospheric analysis. CL51 Features/Benefits Cloud reporting range up to 13 km (43, 000 feet) Second-generation, advanced single-lens optics with excellent performance also at low altitudes Modular design for easy installation and maintenance Reliable operation in all weather: unsurpassed performance in precipitation Detection of Cirrus clouds Backscatter profiling over full range up to 15 km Field-proven, fully automatic 24/7 operation in all weather conditions Extensive self-diagnostics with fault analysis Based on robust and affordable laser diode technology Latest technology from the world leading manufacturer - installed base over 5, 000 Ceilometers worldwide Designed for harsh weather The CL51 has a shield with a blower and heater, which allows steady operation in precipitation and under extreme temperatures. Reliable solar protection is ensured by optical filters. A tiltable shield further protects the instrument Technical data Performance Cloud reporting range Backscatter profiling range Reporting cycle Reporting resolution Distance measurement accuracy against a hard target Laser Eye safety 0 . . . [. . . ] The reproduction, transfer, distribution or storage of information contained in this brochure in any form without the prior written consent of Vaisala is strictly prohibited. All specifications -- technical included -- are subject to change without notice. [. . . ]