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No. 9
Laskin Nozzle Generator Conversion from DOP to PAO
Frequently, ATI customers ask: What is necessary
to convert my TDA-4 series or TDA-6 series Laskin Nozzle Aerosol
Generator to Poly-Alpha Olefin (PAO)? Most Government agencies
and departments are changing from DOP to PAO because DOP has
been put on the suspected carcinogen list.
Since Dr. Hugh Carlon of the Army Chemical
Center has completed research on Emery 3004, the Surgeon General
has accepted PAO as an acceptable substitute for DOP in the
U.S. Army. The Department of Energy and their various test
sites, along with the Food and Drug Administration, are also
accepting PAO as a replacement for DOP. Research conducted
by the Army Chemical Center and Dr. Hugh Carlon has also proven
that PAO is safe.
To convert TDA-4 series or TDA-6 series Generators
from DOP to PAO:
- Drain the existing DOP liquid from the unit.
- Fill the reservoir to approximately half way on the
sight gauge with PAO liquid.
- Drain the reservoir to eliminate any residue DOP remaining
in the reservoir.
- Refill the reservoir to approximately half way on the
sight gauge with PAO.
- Operate the unit as normal.
Correction
Factors
As long as systems are tested in the normal
manner, no adjustments are required. However, adjustment will
be required if a situation should arise where the photometer
used for detection is calibrated to DOP, the generator contains
PAO, and the use of the Internal Reference is necessary. The
reason is that PAO has a different refractive index and gives
a different photometric response than DOP. Therefore, a factor
(of DOP) must be incorporated to insure accuracy if an upstream
sample cannot be obtained to establish a 100% baseline and
the Internal Reference must be used with a photometer that
is not calibrated with the same liquid used in the generator.
Performance Review, the technical journal of the Controlled
Environment Testing Association, contains an article detailing
the particulars on factors and adjustments required. This
article was published in the Winter of 1993, Volume 1, No.
2. A copy can be obtained by calling CETA at (202) 737-0204.
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