Labconco 3980200 User Manual - page 50

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Chapter 6: Maintaining Your Filtered Enclosure

4.  Using the “^” or “ν” keypads, respectively, increase or 

decrease the numerical value until it equals 52 (2'), 34 (3'). 26 

(4') for the enclosure at 90 fpm inflow 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 airflows at 90 fpm; 2' (130cfm), 3' (200 

cfm, 4' (265 cfm.) 

9.  Position the aerosol generator discharge in the intake of the 

baffle inside the enclosure.  

10. Start the aerosol generator (Pressure to be +/- 1 PSIG). Ensure 

that one Laskin nozzle is in the “open” position.  

11. Allow the generator to operate for a minimum of 15 seconds. 

For all integral motorized impeller models, 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. 

NOTE:  For the Purifier Enclosures ducted to the outside, 

place the sampling nozzle in the center of the 

remote blower exhaust.

Acceptance 

Aerosol penetration shall not exceed 0.01 percent measured by the 

photometer.