Labconco Paramoun Ductless Enclosures 69636 Series, 6' Widths - Manual (Page 48)

Chapter 6: Maintaining the Ductless Enclosure
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Procedure
For the ATI 2G Photometer
1.
Turn on the photometer and allow it to operate for a minimum of 5
minutes. Leave the valve in the “CLEAR” setting.
2.
Press the “ENTER” keypad. Press the “REF” keypad.
3.
The display will display “P1” for approximately 1 second, and then
display a numerical value.
4.
Using the “^” or “ν” keypads, respectively, increase or decrease the
numerical value until it equals 59 (2'), 29 (3'), 22 (4'), 23 (5'), 29 (6') for
the enclosure at 80 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.
Maintain the following airflows at 80 fpm; 2' (115 cfm), 3' (230 cfm), 4'
(305 cfm.), 5' (295 cfm), 6' (230 cfm, each impeller).
9.
Position the aerosol generator discharge in the intake of the baffle inside
the enclosure. For 6' sizes with two impellers, position the generator to
the far left and the far right to test each filter.
10.
Start the aerosol generator (Pressure to be +/- 1 psig). (10 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 above the
perforated exhaust cover above the impeller. Scan the entire periphery of
the perforated exhaust cover, within 1 inch of the surface.
Acceptance
Aerosol penetration as a downstream average shall not exceed 0.01 percent
measured by the photometer.