A-A-54473
Shall be designed for a two (2) speed operation that is controlled by a selector switch. The centrifuge motor shall be controlled by a timer, and a pressure-type safety motor shall only operate when the centrifuge cover is properly closed and latched, and the timer is not in the zero (0) position. The two speeds for driving a fully loaded 12 place head at 60 Hz shall be 3,300 minimum revolutions per minute (rpm) for the high speed operating mode, and 2400 +/- 100 rpm for the low speed operating mode. The centrifuge with the motor running and a balanced load shall operate without any tendency to creep.
Shall consist of a base housing, a guard bowl with a cover and latch assembly, a removable twelve (12) place head, a motor assembly, motor operation controls and a power line cord with plug termination. The motor operation controls shall include a timer, speed selector switch, cover safety switch, electric brake circuitry with selector switch, and a speed governor. The base housing shall be made of cast iron and shall be fitted with cushioning rubber feet on the underside. The manually operated switches shall be mounted in cutouts in the base housing. The centrifuge shall have overall dimensions, with cover in the closed position, that does not exceed 12 inches in height. The base dimensions shall project within a horizontal surface area that is not greater than 10 X 10 inches. The weight of a total assembled centrifuge shall not exceed 25 pounds.
Shall be supplied with a detachable twelve (12) place rotating head that is fabricated of lightweight impact resistant plastic. The tube slots shall be numbered from 1 to 12, and shall include an indexing reference so that the head after removal from the centrifuge can be returned to its original orientation on a matching board or holder (a matching board or holder is not required to be supplied with the centrifuge). The head shall be attached to a spindle located on the shaft of the centrifuge motor. The head shall be designed to hold the test tubes in vertical or slightly tilted positions when the centrifuge is not operating (i.e. stationary position). The centrifuging operation shall result in the test tube bottoms swinging from the stationary position to an approximate 45 degrees angle and rotating in a circular orbit having a minimum 2-3/4 inch radius. The head shall be suitable for use outside of the centrifuge as a basket or transport rack for the test tubes. The head shall also allow all the test tubes to be held vertically in place by an elastic band, so that when used a
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