Labconco Class I Enclosure Models 3980423 - Manual (Page 62)

Chapter 8: Troubleshooting and Servicer Operating Log
Product Service 1-800-522-7658 58
58
PROBLEM CAUSE CORRECTIVE ACTION
Airflow Monitor
Malfunction No power.
No lights.
No display. Power cable to circuit board is
disconnected and needs to be
connected. Sensor cable needs to be
connected. Verify that all airflow
monitor interface cables are
connected. Check fuses on enclosure.
No audible alarm. Alarm has been temporarily silenced
using “SILENCE ALARM”.
Wrong alarm set
point. Airflow monitor was not properly
adjusted. Repeat calibration steps
outlined in this manual in Chapter 6.
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.