INSTALLATION AND OPERATION MODEL YB8
April 1999/Manning Environmental Inc.
Page A-4
Figure 2 - Pump Assembly
Figure 3 - Keypad
Figure 4 - Liquid Sensor - Continuity Type
The Manning Model YB8 employs a high speed, dual
roller, vertically mounted, peristaltic pump. The pump is
belt driven by a 12VDC industrial grade motor. T his
ensures quite, smooth performance even while the unit is
subjected to very intense performance conditions. It
utilizes a face plate constructed of clear PVC for easy
visual identification of pump parameters, such as tube
alignment, and spindle and roller operation. The pump
body is made of impact and corrosion resistant Delrin
®
plastic for long life. It securely holds the pump tubing in
place by firmly clamping the two halves of the pump
case together. The pump is capable of vertical lifts of up
to 28 feet and produces sample transport velocities of
2.0 feet per second over a wide range of draw heights
Liquid Sensor
The Model YB8 utilizes a liquid sensor, located near
the entrance to the peristaltic pump, which is capable of
detecting the presence of source fluid as it approaches
the pump inlet. The sensor is either a continuity type
probe (base) or an ultrasonic sensor (optional).
The liquid sensor is used for two reasons.It enables the
sampler to rinse the intake line. After the initiation o f a
sampling sequence t he first o peration is t o turn on the
peristaltic pump. The pump begins rotating
counter-clockwise causing air to be forced out of the
intake tubing. After the set amount of purge time has
elapsed, the unit will reverse t he pump so the rollers are
moving in a clockwise direction. This creates vacuum in
the pump tube, which in turn causes the source liquid, to
begin traveling up the intake line. As soon as the fluid
reaches the liquid sensor, the sampler will immediately
recognize that fluid has reached 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. When the
unit has performed the set number of rinses, a sample
will be drawn. T he rinse option is set in *99
(configuration mode). The sampler can be programmed
to not rinse the line or to rinse the line up to 3 times.
It makes it possible for t he sampler to deliver precise, repeatable samples even in changing lift conditions.
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