Description - Fisher Scientific Power Overhead Stirrer Manuel D'instructions

Description

This stirrer is specifi cally designed for professional use in the laboratory and for use in
industry to stir numerous liquids with various properties and applications.
The stirrer rotates at 20 - 3000 rpm with a maximum torque of 341 Ncm (30 in-lbs)
The stirrer uses a digitally controlled high effi ciency brushless DC motor which yields
high torque over a very wide speed range. The speed is kept constant with continuous
feedback to the motor. The stirrer is designed for reliability and durability. There are no
wear parts that require user service during the normal life of the stirrer. There are no user
serviceable parts.
The stirrer incorporates smart logic for automatic transmission control. This logic deter-
mines the appropriate speed range at which the stirrer should operate. See Fig 1 and Fig
2 under Torque Capabilities. The automatic selection can be overridden by pressing the
speed button.
With higher solution viscosities, more torque is required to stir at the same speed. When
the torque demands are outside the instrument's range, the control logic slows down the
stirrer until the torque comes within the instrument's range. If the torque demand is too
great at the stirrer's lowest possible speed, the unit will automatically shut down.
The stirrer is designed for safety. The unit comes on in "pause"
mode once power is activated. After a power interruption the stirrer remains off. The
stirrer's speed will gradually ramp up to the desired set point after the start/pause button
is pressed.
The stirrer has integrated electronic overload protection which ensures
no damage can occur to the electronics, motor or transmission when an
overload situation occurs, such as too great a torque demand or unit overheating.
A chuck guard is supplied to place over the chuck. It protects the user from the spinning
chuck and also helps to protect the chuck from potential splashes.
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