2-5
Activity in the Room
The expected activities in the room must also be considered when
determining the sensing point. Refrigerants will concentrate near the
floor. Typically, sampling 12-18 inches (30.5-45.7 cm) above the floor
is sufficient for
early warning and to provide adequate protection for
someone working close to the floor. If it is expected that an occupant’s
breathing zone may be less than 12-18 inches (30.5-45.7 cm) off the
floor, locate the sampling point accordingly.
NOTE: S
elect sampling locations which result in the shortest possible
line length in order to reduce transport time.
Consider t
he following guidelines when selecting the location for the
sampling point(s).
1.
Most refrigerants are heavier than air and sink to the floor or
accumulate in low areas.
2.
Ammonia gas is lighter than air and tends to rise to the ceiling.
3.
Place the end of the sampling line in an area that provides the
i
nstrument with a representative sample; ventilation Smoke Tubes
(P/N 458480) are useful in determining air flow patterns in ambient
sampling areas.
4.
Properly exhaust the instrument to a safe area or to outside
at
mosphere.
5.
Ensure the sampling area is free of particulate matter and
c
ondensing moisture; ensure sample lines will not draw moistur
e
up
into the line.
NOTE: Th
e sample gas must be adequately filtered before
ent
ering the instrument. End-of-sample-line filters must be
used with the unit. These filters must be installed at the
end of all sample lines.
6.
Ensure the end of the sampling line is unobstructed to allow the
s
ample to flow freely to the instrument.
7.
Keep sample lines as short as possible to reduce transport time.
CAUTION
Ensure that tubing radii are wide enough to prevent kinking
or bending. Otherwise, an obstruction may occur, preventing
the instrument from sampling the intended area.
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