Product Details
The PAX 100-3 Automatic Micro-Dispensing System is designed to provide controlled
and precise application of microdroplets of either aqueous or organic
compounds.
The PAX 100-3 is widely used for laboratory research in the foliar
uptake of agrochemicals and for precise injection techniques. The
application by syringe is an alternative approach to simulate field-spraying
techniques. These would not only be environmentally unacceptable
but also impracticable if radio-labelled materials were used. The
expense of field spraying is an additional factor to be considered.
Various laboratory applicators have been developed for topical applications
of insecticides in static conditions. Both manually operated and
powered versions have been shown to be valuable instruments and the
PAX 100-3 model a more desirable applicator because of the versatile
nature of the controller and convenient size of the syringe unit.
Such laboratory scale equipment makes possible the delivery of surfactants
and pesticides with ease and reproducibility not possible with hand-held
dispensing.
Scientists developing new chemicals may need to apply large numbers
of microdroplets to insects or plant material. Good replication is
necessary particularly if only small amounts of material is available
for testing. The Burkard Scientific PAX 100-3 clearly demonstrates
the advantages of a separate small dispensing module coupled to a
versatile microprocessor controller.
As there are many uses for this type of instrument, the control
needs to be versatile. Changes in speed of application and volume
is often necessary for assessment programmes together with variation
in the interval time between droplets. Easy setting of the numbers
of aliquots to be delivered, selection of the speed of delivery for
different viscosity, precise setting of the volume required in microlitres
and display of the number of droplets remaining are all readily available
to the operator.
Pax 100-3 also has a range of individual push buttons for fast rewind,
forward advancing of the micrometer, dispense, reset and abort switches.
Applicator Use
The most popular use for the PAX instrument is the application of
compounds to leaf matter or of contact poisons to insects in Petri
dishes where the syringe unit is mounted horizontally on the base.
The droplet formed on the needle tip is detached by gently touching
the surface to be treated. To aid this process, Burkard Scientific
supplies angled cannulae in a range of sizes with or without Teflon
coating.
Alternative Mounting
Quite often, the applicator is used in the greenhouse. Dispensing
liquids on to large numbers of whole plants can be difficult to manipulate.
The universal retort stand accessory supplied is a convenient way
to raise the height of the needle tip and, the foot switch permits ‘hands
free’ operation. An alternative ring and finger switch is an
option.
Syringe And Needle Sizes
For direct selection of µl volumes from the controller, the
standard 1cc and 10cc all-glass syringes should be used. However,
many researches will require to dispense smaller aliquots below 0.1µl,
and other syringe capacities may have plunger sizes not proportional
to the 1cc or 10cc; these are likely to be microlitre syringes of
10µl up to 100µl capacity. A readily available radioisotope
is [ U-14C] Glucose. Typically, 0.2µl will correspond
to a volume setting of 4.2µl on the PAX control.
The standard canulae sizes are 25g x 25mm and 29g or 30g x 25mm
with Luer fitting. Microlitre syringes have fixed or removable needles
which can be Teflon coated to reduce the surface tension effect.
If automatic refill in situ is required, micrometer and syringe adaptors
are available for all types of syringe. The use of an automatic luer
fitting change-over valve may be necessary.
Improved Features In PAX 100-3
Pax 100-3 now offers inching and fast forward as well as fast rewind.
The counter direction will now increment and decrement and is selectable
by switch. The aliquot counter now flashes on completion of the run.
The run indicator is illuminated only when the micrometer is in motion.
Please note: The PAX 100-3 is manufactured exclusively
by Burkard Scientific, Uxbridge, UK.
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