Drucker Diagnostics Model 842VES Centrifuge - Manual (Page 16)

Safety:
Horizon Lid Safety Switch: The Horizon 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. The yellow ‘LATCHED’ indicator light on the front
of the machine will illuminate when the lid has been latched properly.
Horizon Lid Safety Interlock System: In addition to the Lid Safety Switch, the Horizon 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 / EMERGENCY 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 Horizon 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 authorized 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.
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The Horizon 842VES complies with all requirements of CE EN 61000-3-2, -3-3, EN
61000-4-2, -4-3, -4-4, -4-5, -4-6, -4-11, EN 61010-1, -2-020 and UL standard 3101–2–20,
Can/CSA C22.2 No. 1010.1 , Can/CSA C22.2 No. 1010.2.20