Table of Contents
Advertisement
3700 Portable Samplers
Section 2 Setup Procedures
2.2.3 Bottles
2.3 Cooling the Samples
2.4 Suction Line
2-2
Glass Bottles – In the 3700 Standard, install the stainless steel
retaining ring for the glass bottles inside the circle of bottles. It
expands outward to hold the bottles firmly against the interior
wall of the base.
Remove the retaining ring from the base by squeezing the ends of
the ring together and lifting the ring out of the base.
Plastic Bottles – The retaining ring for the plastic bottles in the
portable sampler rests on top of the slanted portion of the bottles.
Mildew-resistant, polypropylene-jacketed draw cords attached to
the bottom of the base hold it in place. Each of these draw cords
is hooked to a corresponding location on the retaining ring.
Detach the plastic retaining ring from the base by disconnecting
the draw cords from the hooks on the ring. Once the ring is
removed, you can lift the bottles out of the base.
Always use the retaining rings in the 3700 Standard, especially
when using ice to cool the samples. The melt water from the ice
will cause the plastic bottles to float, blocking the movement of
the distributor arm.
Compact Sampler Bottles – In the 3700 Compact, the tub is
molded to the contour of the bottles, including the composite
bottles. This eliminates the need for using the bottle inserts to
position the bottles in the tub.
You can cool the samples by placing cubed or crushed ice in the
center of the base section. Users can either dump ice into the
center of the base section or place it in a plastic bag.
For the most uniform cooling, it is best to let the melt water from
the ice run between the sample bottles, creating an ice bath. The
quantity of ice used is dependent upon the required sample tem-
perature and the ambient temperature of the sampling site. The
capacity of the 3700 Standard base is approximately 30 pounds
of cubed ice when glass bottles are used and 10 pounds when
plastic bottles are used. The capacity for the 3700 Compact is 16
pounds. For maximum cooling, fill the base (with bottles in place,
as well as the 3700 Standard's retaining ring) with water and
freeze the base and contents.
Insulation – Both the center section and the base section have
double-walled construction with polyurethane foam insulation.
The insulation on both portable models has a standard thermal
resistance factor of R-11.
The suction line is the piece of tubing that extends from the
sampler's pump tubing intake, at the top of the liquid detector, to
the liquid source. There are three standard suction lines
available: plasticized vinyl tubing in
(0.94-cm) inside diameters (IDs), or FEP PTFE with a polyeth-
3
ylene cover in
/
-inch ID. The polyethylene cover over the
8
0.02-inch (0.051-cm) wall PTFE line prevents the PTFE liner
from kinking or collapsing in service and protects it from
1
3
/
-inch (0.64-cm) or
/
4
8
-inch
Advertisement
Table of Contents
