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Make sure that the welding filter is firmly attached. Depending
on the thickness of the welding filter, there are two options for
tensioning the spring. Fig. 29.
5. Technical specifications
Temperature range
• Storage temperature: from -20 °C to +40 °C at a relative
humidity below 90 %.
• Service temperature: from -10 °C to +55 °C at a relative
humidity below 90 %.
Shelf life
The equipment has a shelf life of 5 years from the date of
manufacture.
6. Key to symbols
See user instructions
Date clocks, year and month
Relative humidity
<XX% RH
+XX°C
Temperature range
-XX°C
7. Approval
NIOSH 42CFR84 Approval
The SR 500 in combination with face shield SR 570 and welding
shield SR 574 is NIOSH approved as a loose fitting respirator with
an Assigned Protec tion Factor (APF) of 25. See NIOSH Approval
Label for approved component configurations, cautions and
limitation statements.
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