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Sensitivity setting (Speedglas 100V only)
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 SENS button. To select another setting, press the SENS button repeatedly 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) |
If the filter does not darken during welding as desired, increase the sensitivity until the welding filter switches reliably. Should the sensitivity be set too high, the filter may 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 darkens and lightens as desired.
Low battery indicator 
The batteries should be replaced when the low battery indicator flashes or LEDs do not flash when the buttons are pressed.
WARNING
Should the Speedglas 100 welding shield fail to switch to the dark state in response to an arc, stop welding immediately and inspect the welding filter as described in these instructions. Continued use of a welding filter that fails to switch to the dark state may cause temporary vision loss. If the problem cannot be identified and corrected, do not use the welding filter, contact your supervisor, distributor or 3M for assistance.
MAINTENANCE
Replacement of outer protection plate.
Remove front frame. (see figure C:1)
Remove the used outer protection plate and place the new outer protection plate on the welding filter. (see figure C:2)
Front frame must always be used (see figure C:3).
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