Can a user control flow to EACH position on the manifold?
Each individual position cannot be controlled. Only each row (1-4) can be adjusted or controlled. The design of the PPM allows a uniform flow to each individual position even at times where a tube may be empty. The flow is controlled by the black dials and the toggle switch on the front of the PPM. The toggle switch position for Full Flow/ Dry Flow should be used when drying columns. The pressure should be adjusted to the highest possible pressure (usually up to 120 psi) but that will depend on the pressure of the gas source. It is not necessary to plug any of the holes on the PPM (as you would on a vacuum manifold) because the design of the manifold and the fritted plates will for each row keep the flow to each position at al times. This is an advantage over vacuum where pressure can be lost if a position is left open or a tube goes dry too fast. The PPM eliminates the need for individual stopcocks at each position when using a vacuum manifold.
