Comparison Limex Pro Line MZK-800D 53390 vs Forte MC-9000

The turn-on time of the filter in the chameleon mask (see "Type"), in other words, the time between striking the arc and darkening the filter to the operating level.

From a safety point of view, the turn-on time should be as short as possible: the faster the "chameleon" works, the less bright light from the arc enters the welder's eyes. On the other hand, reducing the reaction time affects the cost of the product. So for relatively small volumes of work, it is quite acceptable to use relatively “slow” masks — for 100 μs or more(especially since even in the simplest models, the reaction time does not exceed 1200 μs, while theoretically the maximum allowable value is 2000 μs). But for more serious use, you should pay attention to more "fast" options; nowadays, you can find masks with response times from 75 to 100 µs, from 50 to 75 µs, and even less than 50 µs.

The size of the transparent part of the light filter — the "working window", the area through which the welder sees the place of work. A larger working window provides ease of use and a wide field of view, but it significantly affects the cost of the mask and somewhat reduces the strength of the light filter.

Optical sensors determine the filter response speed. They respond to sudden changes in lighting and arc flicker — characteristic signs of the start of welding work. The more sensors in the mask design, the less likely the filter will open during welding. To better capture the difference in radiation, sensors are often placed at different corners of the mask.