Ucansi SERVO GLAS EN379 - Manual (Page 6)

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The required filter dark state can be selected by
using the shade control. The ServoGlas
4000
can be adjusted between shades 9 to 13 with
the embossed arrow on the dial indicating the
current adjustment.
Always use the appropriate shade for the
welding operation you are undertaking. When
in doubt please consult the relevant Standards
or your authorized safety representative.
Where problems are experienced during welding at low currents
[e.g. TIG] or there is a high level of ambient light please follow
these steps: First try adjusting the sensitivity control switch. If
this does not solve the problem hold the helmet close to the
target object and adjust the shade control completely clockwise.
If the welding filter continues in the bright state, leave the control
set at this point. If the filter changes to the dark state, turn the
shade adjustment knob until the filter just switches into the light
state. The filter will then be adjusted correctly. If the welding
filter still does not respond appropriately please try adjusting the
sensitivity control again (having previously adjusted the shade
control as explained above)
Adjustment of the speed at which the welding filter clears
can be reduced by means of the delay control toggle switch.
When this switch is set to 'Fast' the screen will clear more
quickly.