How does the Pipetter sample powders?
The SDSII Powder Pipetter uses a precisely metered vacuum to pull the powder into an adjustable variable volume chamber, the pipette, where it is retained until aspirated by changing the direction of the air flow with controlled air pressure. A filter/piston connected to a metering rod and micrometer head provide very fine and precise adjustment of the pipette volume.

What is the range of sample volumes that can be pipetted?
The available standard pipettes come in 4l volumes and are infinitely adjustable from zero to the maximum volume for the pipette size. Pipette Volume Table

What types of powders can be successfully pipetted?
A wide range of powders have been accurately sampled and dispensed. The list includes but is not limited to: -Powdered Metals -Plastics -Toners -Silica -Food and beverage powders -Glass micro-spheres -Salts -Plastic Beads -Agricultural products such as whole seeds, milled seeds and grains, fertilizers, etc.              

Will the Powder Pipetter sample high moisture content or slurries?
The Powder Pipetter can pipette powders with a high moisture content. However, the moisture content will have an effect on the accuracy and repeatability of the samples. Slurries are not recommended.

What type of Air and vacuum source does the Control Unit have?
The 2300A Control Unit is a complete, self contained and portable system that is easy to set up and use. It requires only a connection to AC power. It uses a reliable oil-less compressor/Vacuum pump suitable for the laboratory environment.                

- Long life, 5,000 hours typical
 - Air and vacuum are controlled via foot switch to reduce operator fatigue.
 - Air pressure is adjustable from 0 - 15 PSI
 - Vacuum is adjustable from 25 - 0 in. hg
- Air and Vacuum gauges are provided for ease and repeatability of adjustment.
 - All stainless steel housing 
- A disposable air filter/water separator is provided to ensure clean dry air to the pipette and eliminate cross contamination.

Do I need to use the Control Unit?
The 2300A Control Unit is a complete, self contained and portable system that is easy to set up and use. It requires only a connection to AC power.

Can I substitute my in house vacuum and air supplies for the Control Unit?
It is possible to substitute"shop" or laboratory air and vacuum sources, however, precise control of both air and vacuum are key to uniform powder samples.

How accurate are the samples I can expect?
A micrometer type head with a very fine thread is used to provide very fine adjustment of the size of the material to be sampled. The typical sample size will vary less than +/-1 1/2 % To a certain extent, controlling the tap density of the powder during pipetting will reduce the sample variation.

How repeatable are the adjustments?
The micrometer head is marked and calibrated making resetting the Pipetter easy and repeatable once the same size and or weight has been determined and recorded. Under the typical controlled conditions, repeatability will be within 1%

What type of filter is used in the Pipetter?
A depth type filter is the primary type of filter used in the pipette to contain the powdered material in the pipette. There are four standard sizes of pipettes and filters.  Pipette Volume Table  

What is the filter material used in the Pipette?
The filter material is medical grade polymer, UHMWPE (Ultra High Molecular Weight Polyethylene) or stainless steel.

Can the filters be cleaned and reused?
The polymer can be cleaned and reused in certain conditions, using a suitable process. However, it is recommended that the polymer filters be discarded when sampling different materials to absolutely avoid cross contamination. Replacement filter cups and elements can be purchased as support items.

How do I clean the polymer type filters?
The polymer dept filters can be cleaned using most common cleaning processes such as common solvents, D.I. water, mild acids and caustics, wet steam and autoclaving. The filter elements must be completely free of moisture before reuse. A chart of chemical compatibility should be consulted before attempting to clean the filters.

Can the stainless steel filter cup and elements be cleaned or reused?
The stainless steel filter cups may be cleaned in a suitable cleaning agent consistent with the powder being sampled before changing powders or reusing.

How do I clean the stainless steel frit type Pipettes and filters?
The stainless steel Pipettes can be cleaned using most common cleaning processes such as common solvents, D.I. water, mild acids and caustics, wet steam and autoclaving. The filter elements must be completely free of moisture before reuse.

How do I clean the Pipetter Handle and micrometer head?
The Pipetter Handle and other parts may also be cleaned using most common cleaning materials and processes such as solvents, D.I. water, mild acids and caustics, wet steam and autoclaving. The Air/Vacuum fitting is constructed of all stainless steel and Poly-tetraflouride (Viton) seals and do not require disassembly when cleaning the handle.

Are the O-rings reusable?
The seals are Poly-tetraflouride (Viton) material and have excellent resistance to most cleaning solvents, mild acids and caustics. The seals can be cleaned with the Handle and reused. Prolonged exposure to superheated steam may degrade the O-ring seal. It is recommended that the O-ring seal on the Filter Cup be replaced each time the filter is cleaned as it may have changed shape or damaged due to wear if the powder under test was abrasive.

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