Zehnder Rittling ZFC 3010, Instruction Manual

Page: 9 / 16

Page 9
4 Handling flow cups
Valid for our products ZFC 3010, ZFC 3011 and ZFC 3013:
•
Choose a flow cup that will give a flow time of between 30 s and 100 s
(depending on the standard).
•
Put the flow cup into the levelled three-foot stand.
•
Have a timing-device (e.g. a stop watch) ready.
•
Close the orifice of the cup by a finger and fill the cup beyond the brim with the
liquid under test, avoiding the formation of air bubbles. The excess liquid will
be caught by the spillover furrow.
•
Slide a glass plate over the rim of the cup so that no air bubbles will be formed
between the glass plate and the surface of the sample.
•
Place a suitable receiving vessel under the flow cup, so that the distance
between the orifice and the vessel is at least 10 cm.
•
Remove the finger from the orifice, draw the glass plate away horizontally and
simultaneously start the timing-device.
Make sure that the surface of the sample is horizontal throughout the whole
flow process.
•
Stop the timing-device as soon as the stream of the sample breaks for the
first time close to the orifice.
spillover furrow