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products and require rejuvenation after exposure to air containing sufficient concen-
trations of vapors that the denuder surfaces become inactive. The PILS is shipped with
uncoated denuders. Under normal sampling conditions, the inorganic vapor denuders
require removal and rejuvenation once every 7 to 14 days of continuous sampling time.
Refer to the denuder rejuvenation procedure in the maintenance section of this manual
for details.
The rejuvenation frequency must be increased under high sulfur dioxide, nitric acid,
or ammonia vapor concentration sampling conditions.
6.10 PILS Options
There are several optional accessories external to the device that can be added at any time
depending on your changing measurement needs. Refer to the table below and contact
Brechtel to purchase your PILS accessories.
83-00009-01A
PILS 4001-115V and 4001-230V
6.10 PILS Options
Figure 15: Photo of the
organic (1), acid (2), and
base (3) gas denuders.
Page 34 of 74
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