8
Low airflow alarm calibration
For factory calibration purposes, the unit is set to alarm at 0.5m/sec with a
boundary point 10mm from the filter face. It is recommended the user sets
their own parameter to suit their specific application and limits.
•
Turn off the cabinet and turn on again whilst holding down
the ‘ALARM
MUTE’ button
. Release the button and the airflow indicator lights will flash
Red/Green alternately.
•
Using a 100mm rotating vane anemometer positioned at the required
minimum capture velocity boundary point from the pre-filter face and by
rotating the adjustment knob, adjust the fan speed to the desired minimum
allowable velocity. Check in at least 3 positions per pre-filter to obtain an
average and adjust as necessary.
•
Wait approximately 20 seconds for the airflow to stabilise and press MUTE
again to record the set point.
•
The low airflow alarm point is now set and the system calibrated.
•
Re-Adjust the fan speed back up to the normal operating velocity as required.
Section 5
Servicing
An annual service is recommended to maintain optimum operating conditions and
will include the following points:
•
Check / replace pre-filter
•
DOP test the main HEPA filter
•
Check airflow monitor and re-calibrate if necessary
•
Check and record air velocity readings
•
Check general condition of cabinet.
•
Inspect electrical components, lighting, cables etc.
•
Issue test report and airflow certificate.
For parts or service information
please contact Monmouth Scientific: +44 (0) 1278 458090
