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6712FR Refrigerated Sampler
Section 2 Installation/Preparation
2-9
2.5 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 and 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 pre-sample purge.
3. The pump direction changes, filling the suction line.
4. When the detector senses liquid, the sampler begins mea-
suring the sample.
5. After depositing the sample, the pump again reverses for
the post-sample 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.)
Figure 2-6 Identifying the Sampler Components
Other variations include extended-program settings for
suction-line rinses and sampling retries. A sampler running a
program with line rinses completes the pre-sample purge and
a
i
b
d
j
h
e
f
g
c
a. Controller.
b. Peristaltic pump.
c. Liquid Detector.
d. Strainer
e. Suction line
f. Stainless Steel Coupling
g. A pump tube routed from the liq-
uid detector’s intake port
through the pump, out the detec-
tor’s discharge port, and over the
side of the controller to a bulk-
head fitting.
h. Bulkhead fitting.
i. Discharge tube running from the
bulkhead through the spring and
distributor arm.
j. Distributor arm and spring.