filters. This process will ensure that the system runs at maximum efficiency while minimizing filter
replacement costs.
The easy access system of the BRAHM ™ Collector helps with faster filter replacement and reduced
maintenance.
Where to Start
Start by making copies of the attached log sheet in Appendix A. This log sheet should be filled out for
each BRAHM ™ Collector you have in your facility. Make a physical check to ensure that the smoke /
particulate is being removed at every ducting pickup point. Some system designs may have
numerous pick up points and performance may vary from based on usage. This can be done by a
simple visual check during normal operation. There should be a reduced level of visible smoke when
the unit is in operation. No smoke should be escaping from the welding cells or pick up locations.
During maintenance, examine the all spark baffle at the duct pick up point(s). These baffles should be
washed when they become visibly dirty / contaminated. Debris accumulation on the baffles can lead
to spark ignition or a possible duct fire.
Replacement filter cartridges and spark baffles of all types are available from your Clean Air Industries sales representative.
How to Determine the Filter Change Interval
At this point, take note and document the pressure differential readings displayed on the controller. It
may be easier to raise the plastic flip lid cover on AutoPulse ™ system to access the display. Initial
readings can vary greatly between units. Readings depend on a number of factors including the
system type, options, and duct / pick up design.
By default, the controller will allow the pressure differential to build to 3.6 in. H 2 O (inches of water
column). This means the unit will automatically pulse the next time unit is stopped. This value may be
different if the options on the controller have been changed.
When the unit begins pulsing, it does not mean that the filters are no longer unusable. This pulsing is
simply the cleaning cycle which extends the filter life and reduces operating costs.
Your actual controller settings will be determined by your experience and set up. Over time, the filters
will clog to a point where the pulsing will not reduce the pressure differential to an acceptable level.
This is the point when the filters should be changed.
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