3M Speedglas G5-02 - Sensitivity Selection; Adjusting Sensitivity Levels

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Table 2 Continued. Recommended Guide for Shade Numbers (Adapted from ANSI Z49.1-2012)
Operation
Electrode Size in.
(mm)
Arc Current
(Amps)
Minimum
Protective
Shade
Recommended*
Shade Number
Torch Brazing (TB) — — 3-4
Torch Soldering (TS) — — 2
Carbon Arc Welding (CAW) — — 14
Operation Plate Thickness in.
(mm)
Recommended*
Shade Number
Oxyfuel Gas Welding (OFW)
Light < 1/8 (< 3) — — 4-5
Medium 1/8 - 1/2 (3-13) — — 5-6
Heavy > 1/2 (> 13) — — 6-8
Oxygen Cutting (OC)
Light < 1 (< 25) — — 3-4
Medium 1-6 (25-150) — — 4-5
Heavy > 6 (> 150) — — 5-6
*As a rule of thumb, start with a shade that is too dark to see the weld zone. Then go to a lighter shade which
gives sufcient view of the weld zone without going below the minimum. In oxyfuel gas welding, cutting, or
brazing where the torch and/or the ux produces a high yellow light, it is desirable to use a lter lens that
absorbs the yellow or sodium line of the visible light spectrum.
Sensitivity Selection
The sensitivity of the arc detection system can be adjusted to accommodate a variety of welding processes and
workplace conditions.
a. In order to see the current sensitivity setting, quickly press and release the SENS + or - button. The current
sensitivity number will blink. To change sensitivity, press the SENS + or - button repeatedly to move the
ashing LED up or down to the desired sensitivity (Fig. 6c).
b. The settings correspond to:
6 High – Most sensitive, for low energy TIG welding or where part of the arc may be obscured from view
5 Medium High – Very low current welding, use of TIG welding machines.
4 Medium – For low current welding, use of TIG welding machines.
3 Normal – For low current, with stable welding arcs or bright ambient light.
2 Low – Used for most types of welding.
1 Very Low – Least sensitive setting. Used if there is interference from other welders’ arcs in the vicinity.
c. If the welding lter does not switch to the dark state during welding as desired, increase the sensitivity.
Should the sensitivity be set too high, the welding lter may remain in the dark state after welding is stopped