VIT-FIT syringe pump
DESCRIPTION of the polyvalent syringe (infusion)
pump
These days there are so many different types of syringes
and so many different volumes used. Some need a standard
syringe from a certain producer; others use only glass,
metal or a PTFE syringes. Volumes go from a microlitre
to 150 mililitres. Is it possible to satisfy everybody
with just a single syringe pump?
With our new VIT-FIT syringe
pump we have tried to solve just this problem.
Our new syringe fixing system VIT-FIT allows almost
any syringe to be used from micro syringes to
large volume syringes without
the use of an adapter and in addition handling
the syringes is made very easy. The syringe is tightly
held in both directions Ú infusion and filling.
To move the pusher we have selected a new
Swiss made motor which uses new technology to
ensure very high torque and
ten times longer lifetime. For the transformation
of the rotation into a linear movement required for pushing
the syringe plunger we have introduced for the first
time new Swiss made linear
bead bearings. This is an expensive component
in our instrument, but it offers decisive advantages
to the user in terms of efficiency and the mechanical
yield/force of the system. The precise mechanics with
a volumetric spiral is protected in the instrument casing
and the pusher arm does not reach out from one side (as
is usual with existing syringe pumps), but is integrated
into the rear of the instrument. The casing and the main
body are made of metal with partial PTFE protection.
Therefore it is less sensitive to solvents.
The microprocessor electronics allow
control of the activity of the pump in an easy but effective
way. The movement of the new brushless neodymium magnet
motor is constantly under the control of the microprocessor,
which corrects immediately any deviation from the pre-set
speed. Up to 99 program steps can
be memorised by the processor. The pump can be programmed
in both directions (for delivery and filling of the syringe).
This allows the pump to be used in any way.
Constant flow rate
In this standard application of the pump Ú the flow rate
will be kept constant during the pre-selected time period
Profile
exponentially increasing flow rate as used for ex. in
Permits varying flow rates to be pre-programmed (including
feeding cultures during fermentation, etc.)
Increment
Increasing flow rate in steps over time (to make gradients)
Decrement
Decreasing flow rates steps as above
Pause
Stops the pump for a specified time before going on to
the next step
Timer
By programming a required time interval with zero flow
rate as the first step the pump can be automatically
switched on
Stop
Stops the pump after the program has finished when zero
flow rate has been programmed as the last step. If the
flow rate of the last step is different from zero then
the pump will continue pumping at the specified flow
rate until the syringe is empty.
Safe Switching Power Supply
As the mechanical losses are so small we can use a miniature
in-plug integrated switching power supply using line
voltages from 90 to 240 V AC, 50Ú60 Hz. During field
application the pump can be powered by a 12 V accumulator
or a 12 V battery.
Automatic switch off
The motor will be switched off when the syringe is empty
or has been refilled
Remote control
Several remote control commands are available:
simple ON/OFF (signal 3 to 12 V DC or higher with resistor)
progressive speed control over the whole range signal 0 to 10 V DC, (0 to 20 or 4 to 20 mA option)
RS 485 interface (option) for communication with a PC or similar device
Speed selection / syringe calibration
To be able to fit the many types of syringes used, the
speed selection is made using speed numbers corresponding
to the velocity of the rotation of the motor. The selected
syringe has to be calibrated. This means that the speed
number (from 000 to 999) has to be put into relation
with the delivered volume as a function of time (flow
rate). The delivered volumes and flow rates as well as
settings are then easily calculated.
DESCRIPTION 
SPECIFICATIONS
ACCESSORIES
INSTALLATION
OPERATING INSTRUCTIONS
GUARANTEE
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