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Chapter 8: Troubleshootin
g
PROBLEM CAUSE CORRECTIVE ACTION
Airflow Monitor
Malfunction
(Continued)
Wrong alarm set
point.
Airflow monitor was not properly
adjusted. Repeat calibration steps
outlined in this manual in Chapter 6
or in the supplied Digital 1000
Monitor Manual.
Constant audible
alarm.
Check airflow and calibration of
airflow monitor. See Chapter 6.
Continuous alarm. Check the face velocity of the
enclosure as the airflow of the
system may have changed. If
incorrect, adjust the speed control to
increase face velocity. The HEPA
filter may have become loaded. If
face velocity is correct, calibrate the
airflow monitor outlined in this
manual in Chapter 6.
Monitor alarms; air
way to airflow
monitor sensor is
blocked by insects,
dust or debris.
Lightly clean the airway with clean
air. Be careful not to touch sensitive
electrical components.
Audible disable
will not stay
operational.
An alarm condition must be
continuously present before the
audible alarm can be silenced. If
flow conditions fluctuate near the
alarm set point, the airflow monitor
will automatically reset it. Action
should be taken to bring the
enclosure airflow into proper
operating parameters or adjust the
alarm set point lower.