Drucker Diagnostics Model 642VFD Centrifuge - Manual (Page 2)

Model Description pg. 2
Supplied Equipment pg. 2
Features pg. 3
Specifications pg. 3
Setup Location and Procedure pg. 4
Front Panel Controls pg. 5
Operation pg. 6
Rotor Removal and Installation pg. 7
Tube Holder Configurations pg. 7,8
Care and Maintenance pg. 9
Troubleshooting pg. 10
Safety, Emergency Rotor Chamber Entry pg. 11
Calibration and Ground Testing pg. 11
Replacement Parts pg. 12
Available Accessories pg. 12
Page 2
Model Description:
The 642VFD is a continuous-duty, electronically-controlled horizontal
centrifuge with a lid safety interlock system. The unit is controlled by an
electronic push–button timer that has been preset for ten (10) minutes, for
precise spin times and ease of use. Samples can be safely viewed through
the transparent lid. Entry into the machine is restricted during operation by
the safety interlock system. The 642VFD features a lighted control panel
that displays the status of the machine, easily viewable from a distance.
For warranty information, turn to page 12.
* The rotor and rotor accessories are rated for a rotation frequency of 4,000 RPM.
Supplied Equipment*:
The following items come standard with each 642VFD Horizon centrifuge:
1. Operator’s manual
2. One (1) six–place horizontal rotor
3. Six (6) 100mm tube holders
4. Six (6) 75mm tube holders
WARNING: For the safety of both
the operator and service personnel,
care should be taken when using this
centrifuge if handling substances that
are known to be toxic, radioactive
or contaminated with pathogenic
microorganisms. When Risk Group
II materials are used, (as identified
in the World Health Organization
“Laboratory Bio–Safety Manual”), a
Bio–Seal should be employed. In the
event that materials of a higher risk
group are being used, more than one
level of protection must be provided.
The use of flammable or explosive
materials as well as those materials
which have a vigorous chemical reac-
tion is prohibited.
Table of Contents
p/n 7786021
p/n 7713031
p/n 7713033
Safety:
Lid Safety Switch: The lid is secured to the top of the cabinet by a latching
knob and pawl system. When the knob is rotated clockwise, the pawl grips the
underside of the cabinet opening and prevents the lid from opening. A mechanical
stop positions the pawl and prevents it from rotating completely. When rotated to
the stop position, the pawl makes contact with a micro–switch mounted underneath
the cabinet top. The lid safety switch prevents the centrifuge from operating while
the lid is open. An indicator light on the front of the machine will light up when the
lid has been latched properly.
Lid Safety Interlock System: In addition to the Lid Safety Switch, the 642VFD
has a true “0 RPM” lid locking system. The lid safety interlock system keeps the
lid locked at all times, (even during power failure), and requires that the rotor be
at rest in order to unlock the lid. The centrifuge will not allow entry into the rotor
chamber unless the centrifuge has power and the rotor is stopped. To open the
lid, make sure that the centrifuge is plugged in and, with the rotor stopped, press
the ‘OPEN / STOP’ button.
Note: After the centrifuge has started spinning, it may be possible to rotate
the lid knob enough to cause the pawl to lose contact with the lid safety
switch. If this happens, the centrifuge motor may lose power, but the lid will
still remain locked. If the knob is accidentally moved and this situation should
occur, rotate the knob fully clockwise to its stop position and the centrifuge
will resume operation.
Circuit Breaker: The 642VFD is protected with a 4 Amp circuit breaker located
at the rear of the machine mounted to the base. Any electrical short circuit will
cause the breaker to cut power to the machine.
Emergency Rotor Chamber Entry:
In the event of power failure, it may be
impossible to unlock the lid by conventional
means. In this case, entry into the rotor
chamber may be made by removing the latch
label and using a pen to manually disengage
the locking mechanism (see photo). Pull the
mechanism towards the control panel and
then unlatch and open the lid. If the unit is
damaged, contact your authorised dealer or
The Drucker Company.
Calibration and Earth Ground Testing:
It is recommended that the top speed, ground continuity and line leakage be
tested every two years for continued safe operation.
Contact The Drucker Company for further information or testing availability.
Page 11
x 6
Optional Accessories:
0.25” tube cushions, p/n 9150
1.0” tube cushions, p/n 1525
x 6