Comparison Limex MZK-350D 53388 vs Limex Expert MZK-500D 53389

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	Limex MZK-350D 53388	Limex Expert MZK-500D 53389
	from $19.84 up to $20.36 Outdated Product	from $24.12 up to $26.56 Outdated Product
all specs only differences
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Type	chameleon helmet	chameleon helmet
Specs
Light filtering levels	4 DIN	4 DIN
Min. degree of darkening	9 DIN	9 DIN
Max. degree of darkening	13 DIN	13 DIN
Protection from UV/IR	16 DIN	16 DIN
Turn-on time	50 ms	40 ms
Filter class	1/2/1/2	1/2/1/2
Filter viewing area (WxH)	90x35 mm	92x42 mm
Filter cartridge dimensions (WxH)	110x90 mm	110x90 mm
Filter cartridge thickness	9 mm	9 mm
Optical sensors	2	2
Operating temperature	-5 – 55 °C	-5 – 55 °C
Helmet weight	450 g	450 g
Filter functions
Darkening adjustment	external mechanical	external mechanical
Sensitivity adjustment	internal mechanical	internal mechanical
Delay time adjustment	internal mechanical	internal mechanical
Grinding mode	external mechanical activation	external mechanical activation
Colour rendering	standard (shades of green)	standard (shades of green)
Design features	internal and external controls	internal and external controls
Color
Added to E-Catalog	march 2017	march 2017

Turn-on time

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.

Filter viewing area (WxH)

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.