Air Science Purair BASIC - System Monitoring and Maintenance; Monitoring Procedures

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®
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24 \ USER OPERATION MANUAL: Purair Basic Series
V. Monitoring
5.1 General
The purpose of the monitoring program is to ensure consistent reliability from the system. This is achieved by
checking the following:
» Ifthepre-ltersbecomeblocked,thevelocityofthecabinetwillbegintofallandwilleventuallycausethe
lterblockagealarmtoilluminate.
» ManualcheckingofthemainltersbytheuseofaGastec
™
or Draeger
™
testkitwillconrmthecondition
ofthelters.
5.2 Manual Monitoring
Manual monitoring of the cabinet should be carried out at least once per year, as this will ensure the monitor-
ing systems are all within calibration and performing correctly.
Airow Measurements
Theinowvelocityofthehoodshouldbecheckedwiththesashatthecorrectoperatingheightusingan
anemometer such as a hot wire, vane anemometer or propeller type. Depending on the size of the cabinet, a
series of readings are to be taken at the front opening; these are to be recorded on a service sheet or system
log sheet.
Manual Filter Testing
TheconditionofthelteristobecheckedusingaGastecorDraegertestkit.Boilingoffasuitablechemical
normallyusedinthecabinetoracontrolledreleaseshouldchallengethelter.Examplescanincludealcohols,
toluene and trichloroethylene.
Fortestingacidlters(acidadsorbing)ormulticombinationlayeredltersincorporatinganacidlayer,use
sulphur dioxide gas (SO
2
) at 2 bubbles per second through water.
The readings should be below your Country’s Occupational Exposure Limit (see Filter Information - page
32). The results are to be recorded on a service sheet or system log sheet.
Ifasignicantamountofchemicalisnotedattheexhaustofthesystem,themainltersshouldbechanged.