Stability Measurement – FAQs


General

  • Can I determine the shelf life of my sample using the Rancimat?


Problems with the execution of a determination

  • My sample foams and therefore gets into the measuring vessel. What should I do?

  • What can I do to improve the reproducibility of the results?

  • Jumps appear in the curve and sometimes also result in an incorrect evaluation of the curve. Why is that and can I do something to stop it?

  • The pump on my instrument is extremely loud. Is that normal?


Application-related

  • Does the accuracy of the sample weight affect the result?

  • What is the smallest and what is the largest sample amount that I can use for the determination?

  • How do I treat fusible solid samples?

  • How do I treat non-fusible solid samples?

  • Does the volume of the measuring solution play a role when determining the induction time?


Method setup-related

  • I would like to determine the oxidation stability of a plant oil. Which method should I use and will I need any special accessories?

  • I would like to determine the oxidation stability of a biodiesel blend. Which method should I use and will I need any special accessories?

  • I would like to determine the thermostability of PVC. Which method should I use and will I need any special accessories?

  • Does the sample temperature affect my result?

  • Why do I need the parameter temperature correction (Delta T) in my method?

  • Does the gas flow affect my result?

  • Do norms/standards exist for oil and fat samples?

  • Do norms/standards exist for biodiesel and biodiesel blends?

  • Do norms/standards exist for PVC samples?


Hardware-related

  • Can I reuse the reaction vessel?

  • Can I reuse the reaction vessel cover?

  • The reaction vessel cover only sits loosely on the reaction vessel. What can I do?

  • How do I know when something is wrong with my conductivity measuring cell?

  • Do I need to determine the cell constant of my conductivity measuring cell?

  • Does the position of the PTFE tubing in the measuring vessel play a role?

  • What do I need to keep in mind when positioning the air tube in the reaction vessel?