INSTALLATION AND OPERATION MODEL YB8
April 1999/Manning Environmental Inc.
Page A-16
Whether the sample event is triggered by a flowmeter or by a time interval, the actual sampling cycle is the
same. For the multiple bottle option, the first action is the advance of the spout to the next bottle. (For single
bottle samplers, this step is omitted.) Next, the sampler turns on the peristaltic pump. The pump begins
rotating counter-clockwise causing air to be forced out of the intake tubing. This clears the intake hose of
any contents or obstructions that may inhibit proper sample collection. After the set amount of purge time
has elapsed, t he unit will t hen reverse t he pump so that t he rollers are now moving in a clockwise direction.
This causes vacuum to be created in the tube, which causes the source liquid, to begin traveling up the intake
line. I f t he unit was programmed t o rinse, as t he source liquid rises in t he intake line it will reach the liquid
sensor. T he sampler will immediately recognize t hat fluid has r eached the inlet to the pump. It will
instantaneously reverse t he direction o f t he pump (rollers will be moving in a counter-clockwise rotation),
sending the water that had been drawn up back out of the intake line. This in effect rinses the line. If the unit
was not set fo r a rinse t he above steps wil be o mmited. U pon completion of t he last rinse, source liquid will
again be drawn up the intake line. The system monitors the flow of liquid and when the preset amount has
passed through, t he pump will reverse o peration again (rollers moving counter-clockwise). T his purges
excess fluid out of the pump and clears the intake line. Depending on how the unit is programmed or
configured, after completing the post sample purge, the sampler will now stop o peration o r continue
performing t hose functions which it has been programmed. F or a complete description o f programming the
sampler see t he programming section in t his manual.
If t he multiple bottle option is being used, t he distribution spout remains stationary until t he next sample
event. This delay prevents cross-contamination of the next sample.
Sample Recovery
Immediate sample recovery is not required since the sampler will automatically shut down when t he sample
container is full (single bottle only), a pre-set number of samples have been taken, or when the program is
complete. H owever, sample analysis may require quick recovery to maintain sample freshness or t o add
chemicals.
If the intent is to leave the containers in the suspension plate, caps can be installed over the suspension
collars. Remove the suspension plate (with bottles) from the refrigerator. Lift the distribution assembly off
the suspension plate and place it on the wire racks mounted in the refrigerator.
It may be easier to remove the distribution assembly first, and then install the bottle caps. To seal the 350ml
glass bottles, replace cap liners, then place caps on bottles.
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