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Operating Principles
The Pump Control Unit controls the supply of compressed gas to pneumatic pumps, including Solinst Bladder Pumps and Double Valve Pumps. Drive (pressure) and vent periods are cycled to provide water flow. During pressurization periods water is forced into the sample tubing. The Vent period allows water to re-enter (recharge) the pump. Cycle repetition may be controlled manually or automatically using pre-set pumping rates.
Pumping Setup
(Click image to enlarge to full size)
Drive and Vent Cycles
There are two ways users can operatate the Model 464 Electronic Pump Control Unit to obtain the desired sampling rates - preset and customized user flow rate settings.
Preset flow rates are built into the Pump Control Unit memory. There is the option of Low, Medium, and High Flow settings
User Flow Rates are customized drive and vent cycles set by the user, then saved in the Control Unit memory for future sampling events. Up to 99 User Flow Rates can be saved to memory.
Manual Operation
The Model 464 has the unique ability to operate even when the batteries run out. If the batteries run out, the 464 Solenoid closes automatically. This allows you to use the Manual Control Valve on the Front Panel of the Control Unit. When pushed in the Solenoid opens, which allows a drive cycle; when released, the system is allowed to vent. A manual drive/vent cycle can be
performed with just a compressed gas source attached.
Obtaining High Quality Samples
The Model 464 comes in two pressure versions, 125 psi and 250 psi. The higher pressure 250 psi version is ideal to use for deeper applications, or applications where faster purge rates are desired. Both versions are ideal for use with Solinst Bladder Pumps and Double Valve Pumps (See Model 407 Bladder Pump, Model 408 Double Valve Pump and Model 408M Micro Double Valve Pump Datasheets).
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