Drucker Diagnostics QBC Horizon 755VES Centrifuge (120V, 60Hz) - Manual (Page 24)

Section 8
CALIBRATION CHECKS
According to Federal Regulations, centrifuges, such as the QBC Capillary Centrifuge, require verification or
calibration as follows: 1) before initial use; 2) after repair or adjustments; and 3) annually after use. The centrifuge
timer, however, should be checked for accuracy at least every 3 months.
The QBC Capillary Centrifuge has been fully calibrated at the factory and is ready to deliver consistent, accurate
test results upon first use. For subsequent calibration checks, follow the procedures in 8.1 and 8.2 below.
8.1 CHECKING ROTOR SPEED
The rotor of the QBC Capillary Centrifuge is designed to spin at 12,000 ± 80 rpm. At least every 6 months or after
any adjustments or repairs, check the rotor speed with a non-contact strobe tachometer to assure that speed
is sufficient to produce visibly distinct and differentiated cell layers in the QBC tube. A window in the top lid and a
reference line on the knob of the rotor cover are provided for speed checks with a non-contact tachometer.
8.2 CHECKING TIMER ACCURACY
The electronic timer of the Centrifuge is designed to be accurate to 300 ± 15 s. Check the timer for accuracy
against a reliable stopwatch or quartz timer at least every
3 months as follows:
a) Install the rotor cover.
b) Close the latch and top lid.
c) Press and release the ON button, and
simultaneously start the stopwatch.
d) Stop the stopwatch when you audibly detect cutoff of power to the motor and the centrifuge begins to
decelerate.
e) The stopwatch reading should be 5 min ± 15 s.
If the 15-s tolerance is exceeded, repeat the check to eliminate the possibility of procedural errors. Request
service if the accuracy check is unsatisfactory.
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