This Vaisala Lidar Ceilometer CL61 is
classified as a Class 1M optical device in accordance with International Standard
IEC/EN 60825‑1:2014. Complies with 21 CFR 1040.10 and 1040.11 except for conformance with
IEC 60825-1 ED. 3., as described in Laser Notice No. 56, dated May 8, 2019.
Table 1. Radiated pattern emitted from protective
housing, from CL61 window
Property
Value
Maximum pulse energy
4.7 μJ
Laser wavelength
910.55 nm typical
Peak power
40 W
Maximum average power
50 mW
Pulse duration
160 ns FWHM
Pulse frequency
9.5 kHz
Beam divergence
±0.2 mrad × ±0.35 mrad
The following table describes the properties of the sole transmitter module. CL61 must never
be operated and have power on when the transmitter module is not attached to the optics
unit.
Table 2. Incorporated laser (CLT611
transmitter)
Property
Value
Laser wavelength
910.55 nm
Peak power
50 W
Maximum average power
70 mW
Pulse duration
160 ns FWHM
Pulse frequency
9.5 kHz
Typical beam divergence
±7 degrees
Figure 1. Location of explanatory and
certification labels on CL61. The device is equipped with the following labels:
Take the following precautions during
installation, operation, and maintenance:
WARNING Viewing the laser output with telescopic optical instruments (for
example, telescopes or binoculars) may pose an eye hazard. Do not direct the beam
into an area where such instruments are likely to be used.
WARNING Only qualified
maintenance personnel may perform maintenance procedures. Make sure unauthorized
persons cannot access the work area during service operations.
WARNING Use of controls or adjustments or performance of procedures other than
those specified herein may result in hazardous radiation exposure.
Figure 2. Location of CL61 laser aperture
1
Laser aperture
2
Laser class 1M, direction of transmitted light
Laser class of the incorporated
laser (transmitter module CLT611) is 3B.
The transmitter module has a laser aperture
and label as shown in the following figure. Avoid exposure to the beam from the aperture.
WARNING Do not remove the
transmitter module CLT611 from its normal position without first switching off the AC (mains)
power.
WARNING Do not look at the
transmitter module CLT611 of the ceilometer from the beam direction when the transmitter is
powered.
Figure 3. Location of warning and explanatory
labels on transmitter module CLT611
