Labnet Spectrafuge 16M, Service Manual, Page: 8 / 28

Section 4
Rotor screw The rotor screw must be kept tight enough that it cannot be
removed by hand. If it has become loose, tighten it firmly,
clockwise, by hand and subsequently torque an additional
1/8 turn using a wrench or other appropriate tool.
Speed calibration After every 100 hours of use (or more frequently if required
by other agencies) the maximum rotor speed should be
verified using an external tachometer via the below proce-
dure or another procedure as required by regulatory agen-
cies. Speed calibration must be performed if the motor or
circuit board has been replaced.
Tools required: insulated screwdriver, non-conductive
photo electric tachometer
reflective adhesive contrast dot/tape
1) Remove metal chute (4 phillips screws) from bottom of
unit. (See figure #3, pg 13.) This will expose a figure 8
shaped hole through which the speed adjust pots can
be accessed. The rear-most is the high speed adjust-
ment pot and the front-most is the low speed adjust-
ment pot.
2) Elevate the unit in a normal upright operating position
so that the adjusting pots can be accessed.
3) Install a small dot of reflective tape near the top outer
edge of the rotor lid catch. Set the speed control on the
front panel at maximum (#14), close the lid and turn on
the unit using the timer.
4) Set up the tachometer through the clear window in the
centrifuge lid to monitor rotor speed. Adjust the high
speed pot (rear-most) so that the rotor speed measures
approximately 14,000rpm on the tachometer.
5) Run the unit at this speed for a minimum of 5 minutes.
6) Adjust the high speed pot (rear-most) so that the rotor
speed measures 14,000rpm, plus or minus 150rpm on
the tachometer.
7) Rotate front panel speed control to #1 (1,000rpm)
setting. Adjust low speed pot (front-most) so that the
rotor speed measures approximately 1,000rpm.
8) Run the unit at this speed for a minimum of 5 minutes.
6
Speed pot access