Teledyne 3700, Installation And Operation Manual

Page: 160 / 242

3700 Portable Samplers
Section 5 Routine Maintenance
5-8
5.4 Suction Line
It is wise to replace the suction line when it becomes worn, cut,
contaminated, or otherwise damaged. Inspect the line periodi-
cally for damage. In critical sampling, you may need to replace
the suction line between sampling programs to avoid cross-con-
tamination. When site conditions change, you will need to
replace the suction line with a different diameter or type of line
(vinyl or PTFE).
Replacement Vinyl Line – Teledyne Isco offers two forms of
replacement vinyl suction lines. First, a complete suction line,
with strainer and tube coupling, is available in 10-foot and
25-foot lengths for each of the
1
/
4
-inch and
3
/
8
-inch ID (Inside
Diameter) vinyl suction lines. Second, bulk suction line in the
1
/
4
-inch ID and
3
/
8
-inch ID vinyl tube is available in 100 and 500
foot rolls. Cut the bulk suction line to even foot lengths.
Note
The vinyl suction tubing contains a very low PPM (parts per
million) level of phenols. If this affects your samples, use the
PTFE suction line.
5.4.1 Vinyl Suction Line The following sections discuss the replacement of the complete
suction line-strainer assemblies, the sizing of the suction line,
and the assembly and installation of the bulk tubing.
Remove the suction line from the pump tubing by detaching the
tube coupling, see Section 2.4.1.
If you must use a completely new suction-line strainer assembly
of the standard 10- or 25 foot-length, install it as described in
Section 2.4.1.
Bulk Suction Line – If you are using bulk suction line to
replace the old line, detach the old line from the tube coupling
and remove the strainer. Cut the new suction line to the desired
length in 1-foot increments. The line must be between 3 and 99
feet long.
To ensure accurate sample volumes, be sure that the line is cut in
1-foot increments and that the line length is correctly entered in
the Suction Line configure option. Screw the strainer into the
new suction line. You can now install the new suction line in the
pump as described in Section 2.4.1.
5.4.2 PTFE Suction Line Remove the suction line from the pump by loosening the clamp
that secures the line to the pump tube and pulling the suction
line out of the pump tube. If you must use a new suction line
(either with or without the optional stainless steel strainer),
install it as described in Section 2.5.
To install the optional
stainless steel strainer, heat the end of the suction line to make it
more flexible, then carefully screw the strainer's threaded con-
nector into the suction line.
Replacement PTFE Line – Teledyne Isco offers
3
/
8
-inch ID
PTFE suction line in lengths of 10 and 25 feet.