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7.3 Tubing Connections
Pre-Impactor
If an impactor was purchased with the PILS, install the impactor in-line on the PILS
sample inlet on the back panel of the PILS. Use conductive silicon tubing, compression
fittings, or some other electrically conductive connection between the impactor and the
sample inlet tubing. If the pressure drop across the impactor will not be monitored, be
sure to plug the small hosebarbs to prevent particle leaks into the system. Do not con-
nect the hosebarbs together, this will defeat the purpose of the impactor. The impactor
should be shipped with the ports already blocked.
To monitor the potential for impactor jet clogging, the user can connect the small hose-
barb pressure ports of the impactor to a differential pressure monitoring device with
a full scale measurement range of about 30" of water (1 psi). Alternatively, the two
pressure-monitoring ports may be sealed and no differential pressure measurement
performed.
IMPORTANT: Do not connect the two impactor differential pressure measurement hose-
barb ports together.
To monitor the pressure drop across the impactor, attach tubing to the small hosebarb
on the inlet to the impactor to the high pressure port of the pressure sensing device.
Attach tubing to the small hosebarb on the exit of the impactor to the low pressure port of
the sensing device. The particle pre-impactor should be inspected regularly for build-up
of particulate matter and cleaned to prevent clogging. The impactor cleaning procedure
is provided in the impactor manual.
IMPORTANT: Familiarize yourself with the typically observed pressure drop measured
across the impactor under normal sample air flow operating conditions. If the pres-
sure drop begins to increase, clean the impactor plate. . Refer to the user manual deliv-
ered with your impactor for additional details.
Vapor Denuders
If vapor denuders were purchased with the PILS, install them in-line on the PILS sample
air flow line downstream of the Pre-Impactor. Install the organic vapor and acidic gasses
denuders upstream of the base gasses denuder to remove as much ammonia as possible
before the sample flow enters the base gasses denuder.
83-00009-01A
PILS 4001-115V and 4001-230V
Page 44 of 74
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