ii
Chapter 5. Changing Capture Hoods ...................................................................................................... 43
Capture Hood Parts Identification ........................................................................................................ 43
Capture Hood Assembly ....................................................................................................................... 43
Alternate Hood Installation ............................................................................................................. 44
Direct Inflow Measurement Hood for Biological Safety Cabinets .................................................. 49
Chapter 6. Flow Measurements Using the Capture Hood .................................................................... 55
Single Reading Measurements ............................................................................................................ 55
Running Average Measurements ......................................................................................................... 56
Capture Hood Measurements (non-backpressure compensated) ....................................................... 56
Backpressure Compensated Measurements ....................................................................................... 56
“ERROR” Display ................................................................................................................................. 57
Chapter 7. Maintenance and Troubleshooting ....................................................................................... 59
Fabric Hood .......................................................................................................................................... 59
Micromanometer ................................................................................................................................... 59
Manifold ................................................................................................................................................ 59
Cases ............................................................................................................................................. 59
Calibration ............................................................................................................................................. 59
Appendix A. Back Pressure ..................................................................................................................... 61
Verifying Flow Measurements .............................................................................................................. 61
Appendix B. Traversing a Duct to Determine Average Air Velocity or Volume.................................. 63
Where to Take the Measurement ......................................................................................................... 63
Traversing a Round Duct...................................................................................................................... 63
Traversing a Square Duct..................................................................................................................... 65
Appendix C. Swirl X Flow Conditioner for Alnor Model EBT731 Balometer
®
Capture Hood Optional Accessory (P/N 801213) ................................................................................... 67
Description ............................................................................................................................................ 67
Performance Data ................................................................................................................................ 68
Installation and Usage .......................................................................................................................... 69
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