maintenance/
troubleshooting
419
Synrad Firestar f-Series operator’s manual
Troubleshooting
When operating f201/f400 lasers, connect nitrogen or breathing-grade air to the Gas Purge connector.
Purging the laser creates a positive pressure inside the laser housing that prevents dirt and debris from
accumulating on optical surfaces including beam combiner, telescope, and turning optics. In condensing
atmospheres, a gas purge helps to reduce the potential for condensation damage. See Connecting in the
Getting Started chapter for information on using a gas purge. Table 1-6 in the Getting Started chapter
provides ltering and drying specications for recommended purge gases.
In addition to a gas purge for the laser housing, many laser processing applications like cutting, weld-
ing, and drilling require an assist gas for the focusing/gas jet assembly. When the application requires air
(instead of nitrogen) as an assist gas, we recommend the use of breathing quality air available in cylinders
from a welding supply company. Because compressed shop air contains minute particles of oil and other
contaminants that will damage optical surfaces, it must be carefully ltered and dried before use as a purge
or assist gas. Refer to Table 3-1, Assist gas purity specications, in the Technical Reference chapter for a list
of common assist gases and their corresponding ltering and drying specications.
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