G16 Smoke Density Monitor
Ver.2.4 – Revision March 2022 25
• When the illumination changes to one of the LEDs on the left, it indicates that the
reflecting beam becomes weaker, i.e. the beam is scattered or blocked, or the lenses
become contaminated. When the illumination changes to the last LED to the left, it
means the opacity level is just above the warning level. Thus, the signal strength illu-
mination can give a quick indication on the opacity level and/or the contamination level
of the transceiver lens and/or the reflector. Please see Figure 4-3.
Figure 6-3: Illustration of weak signal, obstructions to the light beam
Beside the indication of signal strength, the blue LEDs are also used for indication in con-
nection with the initial alignment and address settings.
• Zero and Span: The Zero and Span buttons are used for calibration and initial settings
of light beam strength and transceiver address. Note that during initial setting of the
light beam strength, the laser light will be steady providing good access for fine align-
ment of the beam against the reflector
6.1.2 Set Laser Aligning Function
Once you start laser aligning function (section 6.1.2), you need to continue with setting
unit address (section 6.1.3) until you save the new settings (section 6.1.4).
Visible laser radiation. When the transceiver operates in pulsed mode, the laser is clas-
sified as Class 1, which is safe under all conditions of normal use. When it operates in
the continuous mode (i.e. there is a steady light beam in the aligning mode), the laser
is classified as Class 3R. Thus, please avoid eye exposure to direct or scattered radia-
tion when the transceiver operates in the continuous mode.
During laser aligning step, all possible obstructions to the light beam (such as oil mist,
smoke and dust) must be absent in the section between the transceiver and the reflector.
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