The DryPette is a handheld powder pipette that accurately transfers solids, consisting of a dispensing handle and a controller unit. Powder is drawn into the pipette tip in the handle under vacuum, and then expelled under light positive pressure (DryPette Standard and DryPette Plus), or light positive pressure with or without positive displacement (DryPette Varix range).
The video illustrates the use of the standard DryPette. This video is also available on YOUTUBE.
Precise and Reproducible
DryPette is precise and reproducible with precision being maintained by the removal of the excess powder from the bottom of the tip after aspiration (50mg +/- 2mg; 150mg +/- 1mg; 1000mg +/- 2.5mg)
The pipette is simply operated via a three-position switch (fill - off - dispense) on the hand piece.
The ergonomically designed hand piece allows easy and fatigue-free filling of vessels. The hand piece is connected to a compact control unit connected via a flexible vacuum pipe.
Multiple handle sizes can be used with a single DryPette controller unit to cover a wide dispense weight range, providing an economic, versatile powder dispensing system for your laboratory. Custom designed DryPette nozzles and PickFix tips can also be supplied to order.
Minimal Cross Contamination
A rapidly exchangeable, low cost cellulose filter is incorporated in the delivery line of the pipette to avoid any risk of cross contamination.
The principle of operation for the DryPette is based on aspirating and dispensing a volume of solid material. The tip opening is adjusted until the desired volume is attained, and this volume becomes the amount that is dispensed for each operation. When working with solid materials, it is often desired to know the mass that is being transferred. In order to determine the mass, the solid material should be transfered to a tared destination vial, then reweighed to determine the weight of the transferred amount.
It is not possible to predict in advance the transfer mass in relation to the transfer volume due to the variations inherent in solid particles. Characteristics such as particle size, particle size distribution, density, packing properties, static discharge, particle flow, and more all affect the actual mass of solid material that is transferred within a given volume. Because there is so much variability among different types of powder material, each powder will behave differently.
The DryPette is well suited for the task of repeat transfers of a known, well-behaving granular powder. If the makeup of the powder is consistent, it easy to perform a volume-to-mass calibration. This is done by taking repeated measurements on a balance for the target volume(s) and recording the actual mass that is transferred. Once the mass for a given volume is know for a particular powder, then it is possible to perform repeated transfers based on volume and the final results will be reproducible.
DryPette - manually adjustable pipette
Manually adjustable variable mass/volume powder dispenser, comprising controller unit, mains cable,
instructions, plus a choice of one of 3 standard pipette handles. The volume of the transfer is set by turning a knob on the handle and then locking it into position. To order a complete DryPette, select the Controller Unit plus one of the Handles depending on the desired volume range.
DryPette Plus - manually adjustable large volume pipette
Manually adjustable variable mass/volume powder dispenser, comprising controller unit, mains cable and instructions, plus a large volume pipette handle. The volume of the transfer is set by turning a knob on the handle and then locking it into position. To order a complete DryPette, select the Controller Unit plus one of the Handles depending on the desired volume range.
DryPette PickFix - with exchangeable tips
Powder dispenser with one calibrated push on tip (45μl, 95μl, 150μl, 200μl or 255μl - please state which with order), comprising controller unit, mains cable and instructions, plus pipette handle, 20 filters and filter insertion tool. The volume is fixed for each tip and is not adjustable.
DryPette Varix - programmable powder pipette
Electronically programmable adjustable variable mass/volume powder dispenser, comprising controller unit (positive pressure + positive displacement), mains cable, instructions, plus a choice of pipette handles – Micro, Mini, Midi and Midi+. To order a complete DryPette, select the Controller Unit plus one of the Handles depending on the desired volume range.