DS3252

Our DS3252 double-dosing module uses patented Liquid Needle dosing technology to perform fully automated surface free energy (SFE) determinations, using an automation program in our ADVANCE software. The dosing unit has two pressure dosing mechanisms working in parallel, each simultaneously dispensing one drop of the test liquids water and diiodomethane onto the sample.

For carrying out the drop shape analysis, the image field of the high resolution camera is split into two video windows for viewing both drops at the same time in order to analyze the drops in parallel. The software then uses the resulting contact angles to calculate the SFE of the solid. The entire process, from the point when dosing starts up to the SFE calculation, is fully automatic and complete within a second. For this innovative measuring method, we hold a patent regarding the novel dosing technology.

Despite the speed of the Liquid Needle, the drop advances during dosing without receding when finished so that dewetting is prevented. This leads to highly reliable contact angle results. The noncontact method eliminates the risk of contamination or damage caused by inadvertently touching the sample. Cartridges, that operators can remove quickly and fill directly with test liquids, make the dosing system easy to handle. One filling is enough for approximately 1000 SFE determinations.

In addition to the dosing unit, the following components are also included in the scope of supply:

• 10 cartridges with Luer-Lock connector: 5 transparent for water and 5 brown for diiodomethane
• 10 disposable syringes (1 mL) with Luer connector
• 10 Luer-Lock adapters
• 1 transparent and 1 brown 25 mL glass bottle for test liquids
• Tool for easy removal of cartridges from the dosing unit
• Cleaning set for the dosing valves

The first three positions on this list are also available as spare part set SP52.