Teledyne 6712FR manual How Does the Sampler Work?, Identifying the Sampler Components

6712FR Refrigerated Sampler Section 2 Installation/Preparation

2.5How 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.)

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.

e f g

c

b

h

a

i

j

d

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

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