3M SPEEDGLAS SL - Manual (Page 8)

Sensitivity
The sensitivity of the photo detector system (which responds to the light
from the welding arc) can be adjusted to accommodate a variety of welding
methods and workplace conditions. In order to see the current sensitivity
setting, momentarily press the Sensitivity button. To select another setting,
press the Sensitivity button again while the LED is flashing, and continue
to press until the LED shows the desired setting.
Position 1 Least sensitive setting. Used if there is interference from
other welders’ arcs in the vicinity.
Position 2 Normal position. Used for most types of welding indoors
and outdoors.
Position 3 Position for welding with low current or with stable welding
arcs. (eg TIG welding)
Position 4 Extreme photo detector sensitivity. Suitable for very low
current welding, use of inverter-type TIG welding machines
or pipe welding where part of the arc is obscured from view.
Finding the right Sensitivity setting
In order to find a suitable sensitivity setting, start with the setting, before
welding, in Position 2. This is the default position that functions in the majo-
rity of situations. If the filter does not darken during welding as desired, raise
the sensitivity to Position 3 or 4 until the welding filter switches reliably.
Should the sensitivity be set too high, it is possible that the filter will remain
in the dark state after welding is complete due to ambient light. In this case,
adjust the sensitivity downward to a setting where the welding filter both dar-
kens or lightens as desired.
Low battery indicator
The battery should be replaced when the low battery indicator flashes or
shade and sensitivity LEDs do not flash when the buttons are pushed.
Note!
The welding filter may not go to dark position if the sensors are blocked or
the welding arc is totally shielded.
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