Hanna Instruments HI 300N - Manual (Page 3)

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APPLICATION GUIDE
APPLICATION MODEL
Newtonian fluids HI 300N
up to 2.5 liters HI 301N
HI 302N
HI 304N
Non-Newtonian fluids HI 310N
up to 5 liters whose HI 311N
viscosity changes HI 312N
during stirring or
Newtonian fluids up
to 5 liters or mixing
operation where load
changes during stirring
Repetitive stirring in HI 303N
Newtonian fluids up
to 2.5 liters
Repetitive stirring in HI 304N
multiple samples with
the same stirring speed
Routine stirring HI 322N
application with a
predetermined stirring time
Repetitive stirring in HI 324N
multiple samples with
the same stirring speed
and predetermined
stirring time
Each stirrer is equipped with an opto-sensor
for speed monitoring, and a speed limiter
circuit that prevents hazardous operation when
the load is suddenly removed.
The power required to effectively stir a fluid is
affected by the torque load on the stirrer
which is dependent on the capacity, type and
viscosity of the fluid. The speed of the stirrer
decreases as the torque load increases and
vice versa, unless the power delivered changes
accordingly.
For Newtonian fluids like water, the viscosity
remains constant during stirring. General pur-
pose, normal stirrers are ideal for this kind of
fluids.
For some fluids like oil and clay, the viscos-
ity changes during the stirring process, mak-
ing it necessary to adjust the power to main-
tain a constant speed during the stirring.
Hanna Auto-Speed stirrers (HI 31X series)
are designed with automatic feedback control
to maintain constant speed when the torque
load changes and are therefore ideal for stir-
ring non-Newtonian fluids where the viscosity
changes during stirring.
They are also ideal for mixing applications
where one solution is added to another which
changes the capacity and thereby the torque
load on the stirrer.
The Auto-Speed stirrers maintain a constant
stirring speed during the mixing up to the full
capacity of 5 liters. They can also be used
with Newtonian fluids up to a capacity of
5 liters.
Hanna Instruments reserves the right to
modify the design, construction and appear-
ance of its products without advance notice.