Chapter 1 ________________________________________________________ General Information
VAISALA_______________________________________________________________________ 11
Laser Transmitter CLT321, Receiver CLR321, and AC Power Unit
CLP311 are equipped with the following warning label:
WARNING! HIGH VOLTAGE INSIDE THIS ENCLOSURE
Internal Heater CLH311 can be hot and is equipped with the following
warning labels:
Terms Used in Groundings
Table 3 Specifications for the Grounding Terms
Term Description
GND Electronics common return, used only for signal and data
circuits
SGND Shield Ground for signal cables shields
PE
Protective Earth, connects touchable metal structures to
safe potential.
Recognized by Earth symbol (on the left) and green or
yellow-green wire insulation.
Laser Safety
Vaisala Ceilometer CL31 is classified as a Class 1M laser device in
accordance with International Standard IEC/EN 60 825-1. Complies with
21 CFR 1040.10 and 1040.11 except for the deviations pursuant to the
Laser Notice No. 50, dated July 26, 2001. This means that when CL31 is
installed in a field environment with instrument covers on and pointed
vertically or near-vertically, it poses no established biological hazard to
humans.
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