OHAUS Guardian 3000 Hotplate-Stirrer Manuel D'instructions page 13

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Guardian Hotplate-Stirrers
c) Once the stirrer has reached the target speed, the Speed Setting
Indicator
blinking and remain illuminated.
Note: the unit will only display the target speed during the process.
3 To change the speed setting while the stirrer is on:
a) Rotate the right knob clockwise or counterclockwise to the new speed
setting.
The speed number on the screen will blink to indicate that the speed
setting is not confirmed.
b) Briefly press the right knob to confirm the new speed setting.
The speed number on the screen will stop blinking once the new setting
is confirmed.
Note: If the speed setting screen remains idle without confirmation for 6
seconds, it will reset to the current setting.
4 To turn off the stirrer, press and hold the right knob until the unit beeps and the
lights off.
a) The unit will beep once to confirm the stirrer has been turned off.
b) The
c) The
STIRRING OPERATING TIPS
The stirrer increases speed at a steady rate until the setpoint is reached. If the
stirrer is not reaching its setpoint: 1) the stir bar may be too large, 2) the liquid may
be too viscous, 3) the setpoint speed may need to be reduced. Additionally, the
magnetic strength of stir bars reduce over time and may need to be replaced. Apart
from that, the bottom surface of the vessel can affect the stirring performance of the
magnetic stir bar. Adjust the vessel being used or change the stir bar to optimize
mixing in the sample.
will disappear from the screen and the


on the control panel will go off.
on the screen will illuminate.
EN-11
will stop