ISCO 6700SR, Instruction Manual, Page: 88 / 190

6700SR Refrigerated Sampler
70
Vinyl Suction Line
1. Rinse twice with spectro-grade acetone.
2. Rinse thoroughly with hot tap water using a brush, if possible,
3. Rinse thoroughly three times with tap water.
4. Acid wash with at least 20 percent hydrochloric acid.
5. Rinse thoroughly three times with tap water.
6. Rinse thoroughly three times with distilled water.
7. Rinse thoroughly with petroleum ether and dry by pulling
air through the line.
8. Dry overnight in a warm oven (use an oven temperature of
lower than 150 degrees F), if possible.
9. Cap ends with aluminum foil.
Isco Pump Tube
1. Rinse by pumping hot tap water through the pump tube for
at least 2 minutes.
2. Acid wash the tube by pumping at least a 20 percent solution
of hydrochloric acid through the tube for at least 2 minutes.
3. Rinse by pumping hot tap water through the pump tube for
at least 2 minutes.
4. Rinse by pumping distilled water through the pump tube for
at least 2 minutes.
Replacing the Pump Tube
Replace the pump tube only with Isco’s 6700 pump tubing. Other
pump tubes will not work. The 6700 pump tubing is easily recog-
nized by the blue alignment collars. Improper pump tubes include
those made for Isco’s earlier model samplers (3700, 2900, etc.) and
tubing available from non-Isco vendors. Also note that the dis-
charge tube is not the same as the pump tube. You could experience
several problems if you install the wrong pump tubing:
• The sampler will not pump the liquid.
• Pump jams
• Inaccurate sample volumes
• Faulty liquid detection
Inspect the pump tube periodically. Replace the tube when it cracks
or appears worn. Inspect the tube frequently when the sample liquid
contains a high percentage of suspended or abrasive solids.
Pump Tube Alarm
The sampler tracks the pump counts in both the forward and re-
verse cycles with a resettable counter. When the counter reaches
the default count of 1,000,000 or the count you have entered, the
sampler displays a message, “WARNING! REPLACE PUMP
TUBE.” The message appears each time you turn the sampler on or
run a program until you reset the counter.
After replacing the pump tube, reset the count to zero so that the
sampler can begin tallying the pump counts for the new tube.
Ex-
ample 7 shows you how to reset the pump counts. Replacing the
pump tube does not reset the counter.
Experience may suggest a significantly different pump tube life.
You can change the alarm count to represent the pump tube life for
your application.
Example 7 shows how set the alarm count.
The pump’s safety lock pre-
vents the sampler from run-
ning the pump when the pump
band is open. DO NOT tamper
with the safety mechanism.
The pump is extremely power-
ful. The pump rollers can in-
jure you severely if the
sampler activates the pump
while you are working on it or
inside it.
Disconnect power from the
sampler before replacing the
pump tube.
To extend the pump-tube life:
• Always use Isco pump tubes.
• Install the tube properly, align-
ing the blue collars correctly in
the liquid detector’s grooves.
• Follow the natural curve of the
tube when wrapping the tube
around the pump rollers.
• Minimize the line rinses and
sampling retries in the sam-
pling programs.
• Use the shortest possible
suction line.
Conditions that shorten tube life:
• Improper installation.
• Abrasive materials suspended
in sample liquid.
• Frequent line rinses.
• Long purge cycles, such as
those used with long suction
lines.
CAUTION
Note