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11
MS-(H)-Pro Digital（Hotplate）Magnetic Stirrer
9 Function: Stirring
9.1 Basic Stirring
The function
“
stirring
”
is switched on or off via the rotary
stirring knob. The motor speed is set on the knob (100 to
1500 rpm in steps of 10 rpm ).
When both the function heating and stirring are switched on
and those above operations are done, the LCD will shift to
the speed value and come back to the temperature value in
about 5 seconds.
9.2 Stirring bar breakaway monitoring
In the A or B mode, the stirring bar breakaway monitoring
can be set, as follows:
• Press continuously the function setting key till the LCD
displays
“
br
”
.
• Press the function setting key to switch on or off the
stirring bar breakaway monitoring function, and the LCD
displays
“
On
”
or
“
OFF
”
.
• Press continuously the function setting key till
“
Set
”
disappear.
• The stirring bar breakaway monitoring function has been
set.
Breakaway can occur when stirring at high speeds , when
large stirring bars are being driven at speeds close to the
maximum magnetically torque or sample viscosity changes.
Using MS-(H)-Pro, stirring bar breakaway monitoring
function can be set at the rotary speed range between 300
and 1500 rpm. When stirring bar breakaway is detected,
stirring is stopped immediately to enable the stirring bar
to be picked up. After this, stirring starts again and rotary
speed increases up to the set speed. If a further stirring bar
breakaway occurs within the next 3 minutes of stirring at a
constant set speed, the stirring bar will be picked up again
and stirring will restart but this time at the set speed reduced
by 100 rpm. The speed will be reduced each time in 100 rpm
steps until the minimum of 200 rpm is reached. In this case
you should select new test conditions.
IMPORTANT:
You must calibrate and test the stirring bar breakaway
monitoring function for your particular configuration taking
into account the stirring bars, speed, vessel and medium you
are using.