Allow no more than 1 liter (1.0 quart) to flow through the monitor.
Record the sample volume for reporting.
When collection is completed, turn the three-way valve to the OFF
position before turning off the system pump.
Some pumping systems (e.g. aircraft refuelers) develop a vacuum when closed
which can cause backflow and rupture the monitor filter, rendering the test
Retract the quick-release valve collar and remove the sampler nipple
from the valve. Replace the protective cap and plug (Figure 2.13).
Figure 2.13 Replacing the Protective Cap and Plug
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