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ramé-hart
The ramé-hart DAS (Digital Automated Surface) Tensiometer measures surface tension using the Du Noüy-Padday Rod Pull Method1 as shown above and diagramed below. A rod (DyneProbe) is lowered into a disposable cup (DyneCup) filled with up to 3ml of test liquid and the maximum force incurred during the removal of the DyneProbe is used to calculate the surface tension.
This method yields the most accurate results possible even when up against traditional tensiometers costing four to eight times more. The fully automated measurement takes fewer than 30 seconds. The key to the success of this remarkable tool is a very low-noise high-sensitivity Kibron microbalance. Additional advantages to the DAS Tensiometer include the following: - The Rod Pull Method is the fastest possible method for accurately measuring surface tension. Measurements take about 20 seconds. - Highly viscous samples such as oils and polymers can be easily and accurately measured with the Rod Pull Method where traditional methods falter. - The Du Noüy Rod Pull Method uses an easy-to-clean low-cost probe. The traditional Du Noüy ring method requires a costly platinum ring which is prone to errors if damaged and repair kits are rarely effective. - Unlike traditional ring and plate methods, the Rod Pull Method does not require a correction for buoyancy.
The DAS Tensiometer is a lab-quality tool that can be used in the lab, classroom, or anywhere. A rechargeable battery and small form factor make this device portable - ideal for remote testing and monitoring, including water quality applications.
DAS Tensiometer Instrument Each system includes the instrument, hand-held console, an integrated rechargeable battery, a plug-in power supply, a set of (8) DyneProbes and (10) disposable DyneCups, user documentation, one year warranty and priority product support, and lifetime technical support from ramé-hart. Additional consumables for this product are available online (at www.ramehartstore.com) or direct from our sales office. 1 J Chem Soc, Far Trans I, 71(10), 1919-1931 (1974).
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