(b)
Arranging the Assembly
i.
ii.
iii.
Place a circular gasket on the interface; place
dusting tale on the top and boctom side of all
gasket to minimize adherence to the collection
Paper.
Place plate 5 on top of the gasket.
Next place a tared collection disc (configuracion
Be sure all collection substances
#2) on plate 5.
are placed on the plates with the rough side up.
Next, place another gasket, plate 4, a tared
collection dise (configuration #1), and so on until
plate 1 is in place.
iv.
v.
vi.
vii.
(c)
place the thick washer,
recessed side down on
On top of this washer, place the thin
the bolt.
flat washer and then the speedball handle.
The sampler is now ready co be interfaced with the
standard High Volume Sampler.
Place a tared 8 x 10 backup filter in the high volume
holder, place the rectangular gasket on top of the
filter and interface with the impactor.
Hand cighten all four corners of the interface plate.
with che wing nuts so chat no leakage occurs.
Adjustment to 20 cfm
i.
Li.
2.
Next,
Open both ends of
che manometer and connect one end
to the brass fitcing on the interface plate with the
rubber tubing applied.
Adjust che manomecer reading to 6.0 inches (verify)
by the use of the variac.
This pressure differential
corresponds to 20 cfm
High Volume Air Sampler
(a)
Calibration at the Shop
i.
ii.
The manufacturer calibration curve may differ by as
much as + 10% from calibration curves generated by
using -che calibrator sec at BNL.
The field flowmeter previously used will be changed
to a magnehelic pressure gauge with range from 0-2
in Hg. A calibration curve will be generated for
will be generated for the latter.
(b)
Out in the field, just observe che pressure reading once
(c)
The power to be used ouc in che Field will be either the
in the morning and once in the afternoon daily. This is
If there reason to doubc
to record the effect of loading.
the flowrate due co special occurrences, e.g. power shutoff, read the pressure reading again.
gas fired generator, ship power, or conventional A.C.
euclecs.
nresenc.
Be sure
the necessacy cables and adaptorsare