A-A-54473
transportation rack the banded test tubes can be emptied simultaneously by inverting the head (i.e. pouring off supernatant liquid after centrifuging). The head shall include date coded marking (i.e. date of manufacture) to facilitate monitoring its usage with time. The manufacturer’s or contractor’s service data shall include a recommendation that indicates that the head should be replaced after five (5) years of usage.
Shall be supplied with an induction type motor that has a minimum rating of 1.6 amperes. The motor shall include a blower to create an air stream through the motor housing for cooling purposes.
Shall be supplied with a guard bowl with a guard bowl that is fabricated of aluminum alloy or corrosion-resisting steel. The guard bowl shall be mounted above the base for use as a protective housing for the head. The guard bowl shall be cylindrical with a nominal eight (8) inch diameter. The guard bowl shall include a top mounted hinged cover that is transparent and fabricated of methyl methacrylate or polycarbonate. The cover shall include a suitable cutout (hole or holes) that allows for proper cooling of the spindle (holding the rotating head) during centrifuging. The guard bowl and cover shall include a latch assembly with a manual release. In closure the latch assembly with manual released. The closed cover shall also rest on a gasket that shall cover the exposed edge of the guard bowl. The latch assembly shall include a pressure-type safety switch that shall control the input electric power to the centrifuge motor, so that the centrifuge will only operate when the cover is both closed and properly latched.
Shall be supplied with the following electrical controls and components:
An adjustable three (3) minute (minimum range) rotary electric timer that includes a hold position for continuous operation, five (5) second graduations from 0 to 1 minute, 15 second graduations from 1 to 3 minutes, and an “off” position which results in no electric power to the motor.
A two (2) speed selector switch for selecting the desired centrifuge motor speed mode.
An internal mounted centrifugal switch governor that controls the centrifuge motor speed when the selector switch is positioned for the low speed mode.
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