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About the ALS Series Ex d Valve Monitor with hermetically sealed witch (proximity sensor)

The ALS410 series Ex d valve monitor with hermetically sealed limit switch designed and produced by us has been strictly tested by CSA laboratory for nearly five years, and now officially won the Certificate of Compliance of CSA and ATEX and certified for use both in gas and dust hazardous areas (Zone 1 & Zone 21)

The hermetically sealed limit switch (QA series) provides the industry's leading selection of valve position sensors in process control system. The high quality reed switch are encapsulated using epoxy in QA module which outperform all other position sensors in hot, cold, wet, abusive and corrosive conditions. The QA hermetically sealed switch is actuated with magnets sealed in the cams to protect and prevent falling down and subsequent system failure. The spring loaded splined cam makes sure no vertical shaft motion to avoid loss of signals.