PerkinElmer EnVision, Instrument Manual

Page: 49 / 111

Information about user instructions and warnings
39
Report on laser safety: EnVision with the TRF laser option
General:
EnVision with the TRF laser option includes a nitrogen laser MNL-100
manufactured by LTB. This laser is classified to class 3B and therefore the
safety aspects are made according to 3B-class laser.
Concerning class 3B lasers, the International Standard IEC 60825-1 on the
safety of laser products states the following:
“Class 3B: Lasers that are normally hazardous when direct intrabeam
exposure occurs (i.e. within the NOHD). Viewing diffuse reflections is
normally safe.”
Regarding laser safety, it is extremely important to prevent the user from
being exposed to laser beam, either directly or through reflection from a
mirror surface.
Although the laser used in EnVision is a 3B-class laser, the EnVision
instrument is a class 1 laser product. This is possible, because EnVision has
adequate laser shielding which prevents the user being exposed to the laser
radiation.
Outer covers and openings of EnVision
The case assembly, lid, loading door and side hatch of the instrument form a
light-tight system. Light-tightness is essential not only for laser safety, but
also for the functional performance of the instrument. The laser itself has
been placed on top of the instrument under a protective casing, and the laser
beam is led by an optical fiber via the electronics compartment to the light-
tight instrument compartment. Because of air circulation, the protective
casing of the laser and the electronics compartment cannot be built to be
light-tight. However, the protective casing of the laser and the electronics
compartment can be locked with screws.
EnVision has three openings through which visual contact with the light-
tight measurement compartment can occur. These openings are the lid,
loading door and side hatch (see Figure 1).