Teledyne 6712SR - Manual (Page 36)

6712SR Refrigerated Sampler
Section 2 Installation/Preparation
2-8
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.)
Table 2-2 Selecting the Right Strainer
Strainer Dimensions Application Maximum Depth
3/8 Stainless
Steel Ends,
Polypropylene
Center
Routine
a p p l i c a -
tions. Vinyl Line:
22 feet (6.7m).
Teflon Line:
15 feet (4.5m).
3/8
Stainless Steel
Low Flow
Low flow
a p p l i c a -
tions Vinyl Line:
22 feet (6.7m).
Teflon Line:
15 feet
(4.5m) .
3/8
CPVC
H i g h l y
acidic
liquids. Vinyl Line:
4 feet (1.2m).
Note
• The suction lines will float when filled with air during the purge cycles and when depths exceed the
listed ratings. Secure the suction lines when sampling at depths exceeding the maximum ratings.
• All strainer dimensions are in inches.
• Teflon suction line is compatible only with the
3
/ 8 stainless steel strainer.
1/4 .400
Diameter
Diameter
1
10.5
.400
diameter
7
1
.562
diameter
.400
diameter
1
11.5
1- 5/16
Diameter