6700 Portable Sampler User Manual - Isco

6700 SAMPLERS
Figure 10 Identifying the Sampler Components
a. Controller.
b. Center Section.
c. Peristaltic pump.
d. Liquid Detector.
e. Strainer
f. Suction line
g. Stainless Steel Coupling
h. A pump tube routed from the
liquid detector’s intake port
through the pump, out the
detector’s discharge port, and
over the side of the controller to
a bulkhead fitting at the top of
the center section.
i. Bulkhead fitting.
j. Discharge tube running from the
bulkhead fitting on the inside of
the center section through the
spring and distributor arm.
k. Distributor arm and spring.
HOW DOES THE SAMPLER WORK?
When the sampler takes a sample, it draws liquid through the
strainer and suction line to the pump tube. The liquid flows
through the pump tube, past the liquid detector, which senses the
liquid. From the detector, the liquid follows the pump tube
through the pump to the bulkhead fitting and then through the
discharge tube to the sample bottle.
A typical sampling cycle consists of:
1. The sampler moves the distributor arm over the bottle that
is to receive the sample.
2. The pump reverses for the presample purge.
3. The pump direction changes, filling the suction line.
4. When the detector senses liquid, the sampler begins measuring
the sample. (See Measuring Sample Volume on
page 49.)
5. After depositing the sample, the pump again reverses for
the postsample purge.
Sampling cycles vary somewhat according to program settings
for distribution. The sampler can move the distributor arm clockwise
and counterclockwise, making a number of distribution
methods possible. (In this manual, the words “sample event”
refer to a full sampling cycle for any distribution.)
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