Chemical Forums

Specialty Chemistry Forums => Other Sciences Question Forum => Topic started by: richard3876 on April 30, 2014, 06:26:22 AM

Title: Powder dispensing: Volumetric and Gravimetric methods
Post by: richard3876 on April 30, 2014, 06:26:22 AM

Hi. I hope this is kosher, but I'm wanting someone to tell me why a particular powder-dispensing product is using both volumetric and gravimetric methods.

ZINSSER ANALYTIC's product  (REDI 2002 Plus) uses pipette or tip to pick up a pre-defined or a settable volume of powder. So, why then is there a need to use a gravimetric method to give a particular target weight?

Thanks.

Title: Re: Powder dispensing: Volumetric and Gravimetric methods
Post by: richard3876 on April 30, 2014, 06:41:08 AM

Oh, I think I have my answer in the following blurb: " Since liquid can be pipetted much more finely than powders can be moved, this allows a different volume of liquid to be pipetted to each powder location, based on the actual weight of the powder that was transferred".

This machine is not just a powder dispenser. That's the thing. Which requires an accurate measurement of powder transferred/dispensed. Which is obtained by a gravimetric method, not volumetric.