Grade D / EN 12021 air — treat any failure as an immediate stop-use.
1
Carbon monoxide above limit
criticalCheckVerify with a calibrated CO monitor at the panel outlet; check the intake for engine exhaust.
FixStop use immediately. Relocate the intake and service the CO catalyst; never rely on a filter alone for CO.
SafetyDo not return the system to service until a fresh sample passes at the outlet used by personnel.
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2
Purification cartridge expired
highCheckCheck cartridge hour/date log and inlet temperature — hot inlet air shortens life dramatically.
FixReplace on time, not on appearance. Log the change and re-test.
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3
Dewpoint above spec — moisture in the line
highCheckMeasure pressure dewpoint at the outlet with a calibrated hygrometer.
FixService the dryer and drains; verify the required dewpoint margin for the lowest ambient in use.
ToolsDewpoint meter
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4
Monitoring alarm disabled or out of calibration
highCheckCheck the CO/dewpoint monitor's last calibration date and alarm setpoints.
FixRecalibrate to schedule, restore alarms, and document.
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Safety
Lockout/tagout before opening enclosures. Verify zero energy. Bleed system pressure before opening any pneumatic connection.