Where to Start
Start by making copies of the attached log sheet. This log sheet should be filled out for each Liberty
Weldcell you have in your system. Make a physical check to ensure that the smoke / particulate is
being removed through the intakes spark baffles. 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.
During maintenance, examine the intake spark baffle at the back of the welding booth(s). These filters
should be washed when they become visibly dirty / contaminated. The differential pressure sensor
does measure across intake spark baffles; however, visual inspection is required.
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 to access the display.
The controller will allow the pressure differential to build to 3.0 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.
The controller will allow the pressure differential to build to 7.0 in. H 2 O. At this point it will
automatically pulse while the unit is running until the pressure drops below 7.0 in. H 2 O. 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.
The base line reading is a reference point of the reading with clean filters.
Initially, you should take readings on a weekly basis, or at any point where the smoke plume
is visibly not being removed from the work area. This data will be used to predict the time to
change the filters, or adjust the preset levels. Remember, no two applications are exactly
alike. Because of this your own experience will be needed to optimize filtration, and minimize
filter replacement costs.
Copyright © Clean Air Industries , Inc.
Liberty WeldCell User Manual, August 2023
Page 55 of 66
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