Labconco Precise HEPA-Filtered Glove Boxes 5220231 - Manual (Page 35)

Chapter 6: Maintaining Your Glove Box
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HEPA Filter Leak Test
Purpose
This test is performed to determine the integrity of the HEPA filter(s), the
filter housing, and the filter mounting frames. The leak test is to be done by a
qualified technician with calibrated equipment. Reference Leak Testing and
Photometer scanning from the Institute of Environmental Services (IES-RP-
CC001.3)
Equipment Required
1. An aerosol photometer ATI model 2D, 2E, 2G or equivalent. Air
Techniques Hamilton Associates inc. 11403 Cron Ridge Dr. Owings
Mills, MD 21117
2. One aerosol generator of the Laskin nozzle(s) type. An aerosol of
mineral oil or suitable liquid shall be created by flowing air through it.
The compressed air supplied to the generator should be adjusted to a
pressure as indicated in the procedure. Air Techniques Inc. Model TDA-
4A or equal.
3. Mineral oil (Labconco P/N 1491400).
4. Sampling Nozzle, Rectangular 1/2" x 3-1/4", Air Techniques, Inc.
Procedure
When Using the ATI 2G Photometer
NOTE: Because the downstream side of the HEPA filters cannot be
scanned, a downstream average must be taken.
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 show “P1” or “P2” for approximately 1 second, and
then display a numerical value.
4. Using the “▲” or “▼” keypads, increase or decrease the numerical
value, respectively, until it equals 68. (Set for 100 CFM, adjust for
other airflows.)
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.