APG NLS Pneumatic user manual - Manual (Page 8)

NLS Series Rev. A1, 4/07
8
Automation Products Group, Inc.
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• Maintenance
As a rule, there is no need to inspect periodically. However, pay attention to
the following points.
• In case of low level detection, if the detecting pipe soaks long in
liquid, pressurized air in the detecting pipe is dissolved into liquid.
Consequently, actuating level may raise. To prevent it, the NLS must be
pulled out and purged at adequate intervals.
• Replace the diaphragm about once every three year period. Except
damaged by corrosive vapor, the diaphragm degradation cannot be
checked vertically.
• Check the microswitch operation. Life of the microswitch is 50,000
actuations or more.
• Check that the silicon sealant is applied onto the connecting part
between the NLS and the detecting pipe. If the seal tape is used,
compressed air will leak and switch will not operate properly.