Campbell Scientific CVS4200 / BVS4300 Stationary Samplers - Manual (Page 22)

CVS4200 / BVS4300 Stationary Samplers
TABLE 5-3. Vacuum System Component Descriptions
Number Item Description
1 Solenoid Valves Control the air flow from pump to sampler, either purging or
sucking.
2 Pump Located behind a sheet of metal, the pump does not come into
contact with any liquid whatsoever. It does all the drawing and
purging through using a vacuum and compressor.
3 Touchpad Controller Controls sampler program and offers status feedback on LCD.
4 Sample Distributor Rotates distributor arm between multiple discrete containers.
5 Distributor Arm Dispenses liquid from metering chamber into discrete container.
6 Discrete Sample Containers Multiple containers. Any arrangement of bottles is possible that
is factors of 24 and fits inside the 5 ft
3 refrigeration unit.
7 Pressure Gauge Visually describes sampling process in terms of
vacuum/pressure. Useful for troubleshooting a plugged/kinked
line, or signals leaks. Optional.
8 Liquid Sensing Rod This rod must remain above the volume control tube. When the
sample liquid comes into contact with the two rods, it signals
the controller to stop sampling and begin purging.
9 Barrier Valve Prevents metering chamber overflow in case the liquid sensing
rod fails (for example, completely coated with oils/grease).
10 Volume Control Tube Mechanically set the volume required for sample by using a
wrench on the fitting at the base of this stainless steel tube.
11 Metering Chamber Sample is drawn into chamber up to level set by volume control
tube, then line is purged, followed by dropping sample into
containers. Metering Chambers come in glass or acrylic, from
250 cc to 1,000 cc.
12 Pinch Valve This valve shuts during sampling, then opens during sampling to
drop sample into container, then closes to purge hose.
13 Cap with “Container Full” Shut-
off Optional cap contains Overflow Protection Probes which signal
the sampler to halt when container is full. Can be installed in
maximum two containers, or into a discrete bottle tray.
14 Composite Sample Container A single container to hold sample liquid. Can be used with
smaller refrigerator.
15 Intake Hose Standard samplers come with 7.6 m (25 ft) of 3/8 inch ID PVC
tube.
16 Sinker. Optional Strainer. Keeps the end of the intake tube in the source liquid. Optional
strainer can raise collection point above sinker.
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