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Chapter 6: Maintaining Your Filtered PCR Enclosure
4. Using the “^” or “
ν
” keypads, respectively, increase or
decrease the numerical value until it equals 30 (2'), 20 (3'). 15
(4') for the Purifier Filtered PCR enclosure at 55 fpm
downflow velocity.
5. Press the “ENTER” Keypad. The photometer will scan for 15
seconds, and then the “0” keypad will flash. Press the “Enter”
keypad. The unit will scan for 5 seconds, the display will read
“0000,” and the unit will sound a confirming tone.
6. Set the valve to “DOWNSTREAM.” Place the palm of your
hand over the sampling port of the pistol. There should be a
strong vacuum at this port. If the vacuum is weak, contact Air
Techniques Hamilton Associates.
7. Turn the enclosure on and let it operate for a minimum of 5
minutes.
8. If necessary, adjust the speed control of the enclosure to
maintain the following downflow airflows at 55 fpm; 2'
(230cfm), 3' (340 cfm), 4' (460 cfm.)
9. Position the aerosol generator discharge in the intake of the
prefilter on top of the enclosure.
10. Start the aerosol generator (Pressure to be 10 +/- 1 PSIG).
Ensure that one Laskin nozzle is in the “open” position.
11. Allow the generator to operate for a minimum of 15 seconds.
Scan the downstream exhaust side of the HEPA filter by
passing the sampling nozzle of the gun in slightly overlapping
strokes over the entire surface the filter, with the sampling port
not more than 1 inch from the surface of the filter media. Scan
the entire periphery of the filter and the gasket between the
filter frame and the enclosure frame. Scanning shall be done at
a traverse rate of not more than 2 inches per second.
Acceptance
Aerosol penetration shall not exceed 0.01 percent measured by the
photometer.
Summary of Contents for 3970202
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Page 23: ...18 Chapter 4 Performance Features and Safety Precautions Figure 4 3 UV Sash Closure 16...
Page 58: ...53 Appendix B Dimensions and Exhaust Options Figure B 1 Purifier Filtered PCR Enclosure...
Page 60: ...55 Appendix C Filtered Enclosure Specifications C 1...
Page 61: ...56 Appendix C Filtered Enclosure Specifications C 2...
Page 62: ...57 Appendix C Filtered Enclosure Specifications C 3...
Page 63: ...58 Appendix C Filtered Enclosure Specifications C 4...
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