Rheodyne stainless steel and PEEK sample loops are factory-cut
and finished to the highest quality. The 316 stainless steel
loop ends have a square cut and are burr-free for a flush
connection to the valve. The flexible PEEK loop ends are provided
with a clean and straight cut for easy installation onto the
valve.
Stainless steel (and titanium) sample loops are supplied with
unswaged fittings. The two ends of the loop must be completely
bottomed in the injector ports before the ferrule is swaged
onto the loop. Swaging each end separately and then replacing
the ends in their respective ports of the same valve ensure
that the loop ends are bottomed into the ports. A fitting
made up in one port may leave an undesirable cavity in another
port. As all ports vary in all valves, careful attention to
loop installation is important.
PEEK loops are also supplied with unswaged RheFlex®
fittings but do not require the same swaging precaution.
The fittings can reposition along the loop tubing when the
fitting reinserts in the ports for correct loop installation.
Also see:
Stainless Steel Sample
Loops
Stainless steel and titanium sample loops are available. The
size designations of loops are nominal. The actual volumes
can differ from the theoretical designations because of the
± 0.025 mm (0.001") tolerance of the metal tubing
bore.
Accuracy of large metal loops (1.0 mm, 0.040" bore) is
about ±5%, intermediate loops (0.5 mm, 0.020"
bore) ±10%, and small loops (0.2 mm, 0.007" bore)
±30%.
Since both standards and unknowns are usually analyzed using
the same sample loop, knowledge of the actual, accurate volume
is rarely needed. If the sample loop volume must be known,
it is best to calibrate the loop in place on the valve so
the flow passages in the valve are also taken into account.
An alternative to calibration is to use a dual
mode injector and partial-filling method of loading. See
Tech
Tip 6.
Model 8125 Micro-Scale
Sample Injector requires special loops in the 5.0 µL
to 50 µL range. The 8125 sample loops are made with
0.5 mm (0.020") OD tubing.
Model 7725 Injector loops are not interchangeable with loops
for the Model 7125. The port angle for the 7725 is 30°,
whereas the port angle for the 7125 is 20°, requiring
the loops to have a different shape.
Titanium loops for Models 7125-081 and 7010-087 are available
by consulting your authorized Rheodyne distributor.
Click here for a list
of Distributors.
| Stainless
steel loops for 7125 and 7010 injectors (do not use for
7725) |
| Part number |
Description |
Bore |
| 7020 |
5 µL Sample Loop |
0.18 mm (0.007") |
7021 |
10 µL Sample Loop |
0.30 mm (0.012") |
7022 |
20 µL Sample Loop |
0.51 mm (0.020") |
7023 |
50 µL Sample Loop |
0.51 mm (0.020") |
7024 |
100 µL Sample Loop |
0.51 mm (0.020") |
7025 |
200 µL Sample Loop |
0.76 mm (0.030") |
7026 |
500 µL Sample Loop |
0.76 mm (0.030") |
7027 |
1.0 mL Sample Loop |
0.76 mm (0.030") |
| 7028 |
2.0 mL Sample Loop |
1.0 mm (0.040") |
7029 |
5.0 mL Sample Loop |
1.0 mm (0.040") |
| Stainless
steel loops for 7725, 7725i, PR700-100, and PR703-100
injectors (do not use for 7125) |
| Part number |
Description |
Bore |
| 7755-020 |
5 µL Sample Loop |
0.18 mm (0.007") |
7755-021 |
10 µL Sample Loop |
0.30 mm (0.012") |
7755-022 |
20 µL Sample Loop |
0.30 mm (0.012") |
7755-023 |
50 µL Sample Loop |
0.51 mm (0.020") |
7755-024 |
100 µL Sample Loop |
0.51 mm (0.020") |
7755-025 |
200 µL Sample Loop |
0.76 mm (0.030") |
7755-026 |
500 µL Sample Loop |
0.76 mm (0.030") |
7755-027 |
1.0 mL Sample Loop |
0.76 mm (0.03") |
7755-028 |
2.0 mL Sample Loop |
1.0 mm (0.040") |
7755-029 |
5.0 mL Sample Loop |
1.0 mm (0.040") |
| Stainless
steel loops for 3725-038 and 3725i-038 injectors |
| Part number |
Description |
Bore |
| 3065-018 |
2.0 mL Sample Loop |
2.0 mm (0.080") |
3065-019 |
5.0 mL Sample Loop |
2.0 mm (0.080") |
3065-023 |
10 mL Sample Loop |
2.0 mm (0.080") |
3065-025 |
20 mL Sample Loop |
2.0 mm (0.080") |
| Stainless
steel loops for 8125 injectors (use 7755-024 to 7755-029
for volumes > 50 µL |
| Part number |
Description |
Bore |
| 8020 |
5 µL Sample Loop |
2.0 mm (0.080") |
8021 |
10 µL Sample Loop |
2.0 mm (0.080") |
8022 |
20 µL Sample Loop |
0.25 mm (0.010") |
8023 |
50 µL Sample Loop |
0.30 mm (0.012") |
PEEK Sample Loops
PEEK sample loops are alternatives to stainless steel loops.
The material is inert to
almost all organic solvents and is biocompatible, which gives
PEEK loops added
versatility. Rheodyne uses natural PEEK for these sample loops.
This means no dye
leaching into your sample. Like metal loops, the size designations
of PEEK loops are
nominal. The actual volumes can differ from the theoretical
designations because of
the ± 0.05 mm (0.002") tolerance of the tubing
bore. Accuracy of large PEEK loops
(0.8 mm, 0.030" bore) is about ±14%, intermediate
loops (0.5 mm, 0.020") ±21%,
and small loops (0.2 mm, 0.007") ±65%.
PEEK
Physical Strength Characteristics
Although PEEK material is compatible with virtually all solvents,
there are many
factors that affect burst pressure of PEEK tubing. Factors
such as increases in inner
diameter, temperature, exposure time, and concentration of
organic solvents affect
the degradation of PEEK. Other solvents such a THF, methylene
chloride, and
DMSO cause PEEK tubing to swell while concentrated nitric
acid and sulfuric acid
weaken tubing.
The table below shows the suggested maximum pressures at which
various 1.6 mm (1/16")
and 3.2 mm (1/8") OD PEEK loops operate. We suggest operating
at 3.4 MPa (34.5
bar, 500 psi) below the tabulated pressures as a safety measure.
Click here for a list
of Distributors.
| Suggested
Minimum Pressure for PEEK Sample Loops |
Tube OD |
Tube ID |
Sample Loop |
Water* |
1:1 ACN/Water |
100% ACN |
100% THF |
100% IPA |
| 1/16" |
0.007" |
5 µL |
>5500 |
>5500 |
4000 |
2500 |
>5000 |
1/16" |
0.010" |
10, 20 µL |
5500 |
5500 |
3500 |
2500 |
5000 |
1/16" |
0.020" |
50, 100, 200 µL |
4500 |
4500 |
3000 |
1500 |
4000 |
1/16" |
0.030" |
0.5, 1.0, 2.0, 5.0, 10 mL |
3500 |
3500 |
3000 |
1500 |
4000 |
1/8" |
0.062" |
2.0, 5.0 mL |
4500 |
4500 |
4000 |
2500 |
3000 |
1/8" |
0.080" |
10, 20 mL |
>5000 |
3000 |
2000 |
1000 |
2500 |
| *Pressures are in units of psi. 1.0 MPa
= 10 bar = 145 psi. |
| PEEK
Loops for 9725, 9010, PR750-100, and PR753-100 Injectors |
Part Number |
Description |
Bore |
| 7123-227 |
1 µL Sample Loop
(Model PR750-100 only) |
internal groove |
7755-015 |
2 µL Sample Loop (9725 only) |
internal groove |
9055-020 |
5.0 µL Sample Loop |
0.18 mm (0.007") |
9055-021 |
10 µL Sample Loop |
0.25 mm (0.010") |
9055-022 |
20 µL Sample Loop |
0.25 mm (0.010") |
9055-023 |
50 µL Sample Loop |
0.51 mm (0.020") |
9055-024 |
100 µL Sample Loop |
0.25 mm (0.010") |
9055-025 |
200 µL Sample Loop |
0.51 mm (0.020") |
9055-026 |
500 µL Sample Loop |
0.76 mm (0.030") |
9055-027 |
1.0 mL Sample Loop |
0.76 mm (0.030") |
9055-028 |
2.0 mL Sample Loop |
0.76 mm (0.030") |
9055-029 |
5.0 mL Sample Loop |
0.76 mm (0.030") |
9055-033 |
10 mL Sample Loop |
0.76 mm (0.030") |
| PEEK
Loops for 3725 and 3725i Injectors |
Part Number |
Description |
Bore |
| 3055-018 |
2.0 mL Sample Loop |
1.6 mm (0.062") |
3055-019 |
5.0 mL Sample Loop |
1.6 mm (0.062") |
3055-023 |
10 mL Sample Loop |
1.6 mm (0.062") |
3055-025 |
20 mL Sample Loop |
2.0 mm (0.080") |
| PEEK
Loops for 7725,7725i, and PR700 Injectors |
Part Number |
Description |
Bore |
| 7123-227 |
1 µL Sample Loop
(Model PR700-100 only) |
internal groove |
7755-015 |
2 µL Sample Loop (Models 7725
and 7725i only) |
internal groove |
|
 |
Sample Loops
