|Dry powders should be
Compared to wet analysis
where products are suspended in
liquid first, the amount of sample
analysed is significantly higher
giving the user a more reliable
result. No solvent is required
and hence the sample is not affected
by any solvent at all. Moreover
the analysis time decreases into
the second to millisecond range.
For product specific dry dispersing
modules are available.
GRADIS for coarse particles up to 8750 §:
This unit is ideal for products
that don't need a high dispersing
energy, like crystals, sand,
granules etc. The fall shaft
provides smooth dispersion and
controls and equals the speed
of the particles presented to
the laser beam. If required,
the sample can be collected
and re-used after the analysis.
GRADIS is fed by VIBRI, the
software controlled feeding
device for HELOS dry dispersing modules
RODOS & RODOS/M for particles from 0.1 to 3500
Using compressed air to disperse
even the finest powder this
module generates a dry aerosol
which is blown through the laser
beam and collected in a suction
after the analysis. Particle-particle-collisions,
velocity gradients are applied
within the RODOS injector for
complete dispersing of the sample. The
dispersion energy can be adapted
to the demands of the product.
RODOS/M as the fully automated
version of RODOS is completely
controlled by software. The
correct product dependent dispersion
force is automatically chosen
by the software's database.
This makes RODOS/M ideal for
validated applications e.g.
in the pharmaceutical industry.
The sample feeding for RODOS
& RODOS/M can be done by
VIBRI or the micro-dosing device
ASPIROS. For special applications
RODOS and the measuring zone
can be enclosed.
If not only dry powder analysis
is your daily lab business but
also suspensions and emulsions
are analysed, RODOS/M can be
extended by SUCELL/M into the
multifunctional dry and wet
dispersion module OASIS.
VIBRI & ASPIROS sample couplers
A constant sample mass-flow
is of decisive importance for
powerful dry dispersing.
The controlled vibratory feeding
unit VIBRI, equipped with a
built in amplitude controller
feeds the sample constantly
and independent of the load
in the VIBRI funnel into RODOS
or GRADIS. The vibration power
and the funnel height are controlled
by software for product dependant
and reproducible sample feeding.
The funnel as well as the chute
are available in different geometries
and sizes, specially coated,
conductive or non-conductive
to satisfy the demands of your
If only small quantities of
valuable products or toxic material
are to be analysed, the micro-dosing
device ASPIROS can be applied.
ASPIROS is mounted instead of
the RODOS funnel. It's encapsulated
sample chute is prepared and
filled with a few micrograms
in a glove box or a fume cabinet.
The sealed sample tube is inserted
into ASPIROS. The unit's bar
code reader identifies the sample,
automatically applies the correct
dispersion settings and releases
the sample into the RODOS injector
for analysis. Having an encapsulated
HELOS measuring zone, no product
is exposed to the environment.