BRAND PLT Instrucciones De Manejo página 59

What does the vertical progress bar on the display show?
B
A
What if there are leaks?
If a dynamic test indicates the presence of leaks, you can attempt to localize the source with further
testing:
1.
A static test should be performed next.
The plunger button is not pressed; the piston is not moved. If the pipette is now leak-tight, this
suggests there are scratches on the piston.
2.
The dynamic test should be performed without a tip.
Adapter 2 must be used in this case. If the pipette is now leak-tight, it is possible that an un-
suitable tip was used.
What do the letters after some volumes mean?
The additional letters after some volumes on the volume selection menu have the following mean-
ings:
y Yellow (instrument with yellow tip)
c Clear tip
n nano-cap tip
soft During the testing of 5 mL and 10 mL pipettes, the piston might not move all the way back to
top in the dynamic test, but might remain stuck in the instrument due to vacuum and fric-
tion. If this is the case, select the "5 ml soft or 10 ml soft" test mode.
Note on duration of tests
In the first test after the device has been switched on, a relatively large volume must be pumped out,
after which the device must be given time to stabilize (relaxation). Regularly switching between large
and small pipette types leads to longer test durations because the measurement pressure must be re-
set each time.
The measurement time for pipettes up to 1000 μL is generally 5 s, whereas it can be 20 s for 10 mL in-
struments.
PLT unit 997960
A mark is added to the progress bar. It indicates the thresh-
old value. It corresponds to approx. ¼ of the volume toler-
C
ance according to ISO 8655-2.
A: The progress bar is filled in all the way to the bottom: The
pipette is leak-tight.
B: The progress bar is filled in from the top only down to the
threshold value region: We recommend that a gravimetric
test be performed.
C: The progress bar is filled in to a point well above the
threshold value:
The pipette is leaky. A gravimetric test should be performed;
if necessary, the unit should be sent in for repair.
5 Performing the test
59
Operating manual