Horizontal Laminar Flow Workstation
User Manual
6
Airflow
The Blower Motor is extremely efficient throughout a wide pressure range; it will overcome the resistance of
both a clean and moderately “loaded” HEPA filter . Loaded refers to the number of particles trapped in the filter .
The variable motor blower speed control is set at the factory to give a laminar airflow velocity of 90-100 linear
feet per minute as measured by a thermoanemometer or velometer .
As the HEPA filter becomes “loaded” with particulate matter, the blower will overcome a considerable increase
in resistance without having to be reset . Eventually, the speed control will reach the maximum setting . At this
point, the hot wire to the motor should be reconnected to the next higher power level . Over time the filter will
become loaded requiring an adjustment of the speed control . To best determine when the filters should be
changed, direct readings of airflow in feet per minute should be taken . This is usually done with a velometer or
thermoanemometer . These adjustments and measurements should only be performed by a certifier .
If your unit is not equipped with a pressure gauge, airflow is verified by getting the hood routinely checked
by a certifier . Even without a pressure gauge, the motor blower will continue to increase the speed control to
maintain a laminar airflow velocity of 90-100 linear feet per minute .
Summary of Contents for BZ Series
Page 7: ...Horizontal Laminar Flow Workstation User Manual 7 Airflow Diagram ...
Page 18: ...Horizontal Laminar Flow Workstation User Manual 18 Service Log Date Service Provided ...
Page 20: ...Horizontal Laminar Flow Workstation User Manual Appendix A Line Drawings ...
Page 25: ...Horizontal Laminar Flow Workstation User Manual Appendix B Wiring Diagrams ...
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Page 34: ...Horizontal Laminar Flow Workstation User Manual Appendix C Sensocon User Manual ...